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Safety & Efficacy of Zirconium Silicate in Mild to Moderate Hyperkalemia

Multicenter, Two-phase, Multi-dose, Prospective, Randomized, Double-blind, Placebo-Controlled Study of Safety and Efficacy of Microporous, Fractionated, Protonated Zirconium Silicate in Mild to Moderate Hyperkalemia

Status
Completed
Phases
Phase 3
Study type
Interventional
Source
ClinicalTrials.gov
Registry ID
NCT01737697
Enrollment
754
Registered
2012-11-29
Start date
2012-11-30
Completion date
2013-11-30
Last updated
2018-10-12

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Hyperkalemia

Brief summary

Acute Phase: It is hypothesized that ZS (zirconium silicate) is more effective than placebo control (alternative hypothesis) in lowering S-K levels in subjects with S-K between 5.0 - 6.5 mmol/l versus no difference between ZS and placebo control (null hypothesis). Subacute Phase (randomized withdrawal): It is hypothesized that ZS once daily is more effective than placebo control (alternative hypotheses) in maintaining normokalemic levels (3.5 - 4.9 mmol/l) among subjects completing the Acute Phase versus no difference between each ZS dose and respective placebo controls (null hypotheses).

Detailed description

A total of 750 subjects with mild to moderate hyperkalemia (i- STAT potassium levels between 5.0-6.5 mmol/l, inclusive) will be enrolled in the study where they, in a double-blind fashion, will be randomized 1:1:1:1:1 to receive one of four (4) doses of ZS (1.25g, 2.5g, 5g, and 10g) or placebo control, administered 3 times daily (tid) with meals for the initial 48 hours (Acute Phase), followed by a Subacute Phase (randomized withdrawal) during which patients treated with active doses in the Acute Phase, who achieve normokalemia (i-STAT potassium values 3.5 to 4.9 mmol/l, inclusive) will be randomized to 12 days of subacute, once a day (qd) dosing. There will be a one-time randomization to assign the Acute Phase treatment and the Subacute Phase treatment. The Subacute Phase will include subjects who became normokalemic on active drug and those who became normokalemic on placebo. The former will be randomized in a 1:1 ratio between the same dose of ZS they received during the acute phase but only administered once a day (qd) or placebo, qd. Subjects on placebo during the Acute Phase who are normokalemic in the morning of Study Day 3, will be randomized to receive either 1.25 or 2.5 g ZS, qd as Subacute Phase treatment. Safety and tolerability will be assessed on an ongoing basis by an Independent Data Safety Monitoring Board (DSMB). Each active dose group will consist of 150 patients per treatment group including the placebo control group for a total of 750 patients; the 1:1:1:1:1 allocation helps to optimize the multiple active dose comparisons to the respective placebo controls for the Subacute Phase.

Interventions

DRUGZirconium silicate (acute phase)

Randomized oral doses (1.25g, 2.5g, 5g, and 10g) of microporous, fractionated, protonated zirconium silicate administered 3 times (tid) daily with meals for 48 hours.

DRUGZirconium silicate (subacute phase)

Randomized oral doses (1.25g, 2.5g, 5g, and 10g) of microporous, fractionated, protonated zirconium silicate administered once a day prior to the morning meal for 12 days.

DRUGPlacebo (acute phase)

Randomized to mimic doses of experimental drug administered 3 times (tid) daily with meals for 48 hours during the acute phase.

DRUGPlacebo ( subacute phase)

Randomized to mimic doses of experimental drug administered once a day prior to the morning meal for 12 days during the subacute phase.

Sponsors

ZS Pharma, Inc.
Lead SponsorINDUSTRY

Study design

Allocation
RANDOMIZED
Intervention model
PARALLEL
Primary purpose
SUPPORTIVE_CARE
Masking
QUADRUPLE (Subject, Caregiver, Investigator, Outcomes Assessor)

Eligibility

Sex/Gender
ALL
Age
18 Years to No maximum
Healthy volunteers
No

Inclusion criteria

* Provision of written informed consent. * Over 18 years of age. * Mean i-STAT potassium values between 5.0 - 6.5 mmol/l inclusive, at screening (Study Day 0). * Ability to have repeated blood draws or effective venous catheterization. * Women of childbearing potential must be practicing a highly effective method of birth control.

Exclusion criteria

* Pseudohyperkalemia signs and symptoms, such as excessive fist clinching hemolyzed blood specimen, severe leukocytosis or thrombocytosis. * Subjects treated with lactulose, xifaxan or other nonabsorbed antibiotics for hyperammonemia within the last 7 days. * Subjects treated with resins (such as Sevelamer acetate or Sodium polystyrene sulfonate \[SPS; e.g. Kayexalate®\]), calcium acetate, calcium carbonate, or lanthanum carbonate, within the last 7 days. * Subjects with a life expectancy of less than 3 months. * Subjects who are HIV positive. * Subjects who are severely physically or mentally incapacitated and who in the opinion of investigator are unable to perform the subjects' tasks associated with the protocol. * Women who are pregnant, lactating, or planning to become pregnant. * Subjects with Ketoacidosis/Acidemia. * Presence of any condition which, in the opinion of the investigator, places the subject at undue risk or potentially jeopardizes the quality of the data to be generated. * Known hypersensitivity or previous anaphylaxis to ZS or to components thereof. * Previous treatment with ZS * Treatment with a drug or device within the last 30 days that has not received regulatory approval at the time of study entry. * Subjects with cardiac arrhythmias that require immediate treatment. * Insulin-dependent diabetes mellitus * Subjects on dialysis

Design outcomes

Primary

MeasureTime frame
Exponential Rate of Change in Serum Potassium (S-K) Levels During the Initial 48 Hours of Study Drug Treatment.Through 48 hours acute phase
Exponential Rate of Change in S-K Levels in the Subacute Phase.Through 12 days subacute phase (Day 3 through Day 15)

Secondary

MeasureTime frameDescription
Mean Percent Change From Baseline in S-K Change at All Time Points Acute PhaseThrough 48 hours acute phase. In particular, 1, 2, 4 hour Post 1st Dose on Study Day 1; 0 hour Pre-dose, 1, 4 hour Post 1st Dose on Study Day 2; and 0 hour Pre-dose on Study Day 3.Mean percent change from baseline in S-K at all time points over initial 48 hours
Time Subjects Remain Normokalemic (Subacute Phase)Through 18 days (12 days treatment, 6 days follow-up) of subacute phaseTime (number of days) subjects remain normokalemic (3.5 - 5.0 mmol/l) subacute phase
Percentage of Subjects Who Achieve Normalization in S-K Levels After 48 Hours of TreatmentThrough 48 hours acute phase
Mean Change From Subacute Baseline in Serum Potassium at All Time Points.Through 18 days of subacute phase (12 days treatment, 6 days follow-up)Mean change from subacute baseline in serum potassium at all time points during subacute phase
Mean Percent Change From Subacute Baseline in Serum Potassium at All Time Points.Through 18 days of subacute phase (12 days treatment, 6 days follow-up)Mean percent change from subacute baseline in serum potassium at all time points during subacute phase
Percentage of Subjects Within Each Treatment Group Who Retained Normal S-K Values at End of Subacute PhaseThrough 18 days of subacute phase (12 days treatment, 6 days follow-up)Percentage of subjects within each treatment group who retained normal S-K values (values between 3.5-5.0 mmol/L) at end of subacute phase
Mean Change From Baseline in S-K at All Time Points Acute PhaseThrough 48 hours acute phase. In particular, at Baseline; 1, 2, 4 hour Post 1st Dose on Study Day 1; 0 hour Pre-dose, 1, 4 hour Post 1st Dose on Study Day 2; and 0 hour Pre-dose on Study Day 3.Mean change from baseline in S-K at all time points over initial 48 hours

Countries

Australia, United States

Participant flow

Recruitment details

Participants took part in the study at 65 sites (up to 100 sites initially planned in Protocol) in the United States, Australia, and South Africa from 25 November 2012 to 29 October 2013.

Pre-assignment details

In the acute phase, 754 subjects were randomized; 753 were treated. Subjects who completed the AP and had i-STAT K+ values within normal range in a.m. of Study Day 3 could enter the Subacute Phase. 543 subjects entered the subacute phase.

Participants by arm

ArmCount
Acute Phase: Placebo TID
Participants administered placebo three times daily (TID) orally as suspension for first 48 hours.
158
Acute Phase: Sodium Zirconium Cyclosilicate (ZS) 1.25 g TID
Participants administered ZS 1.25 g TID as suspension orally for first 48 hours.
154
Acute Phase: ZS 2.5 g TID
Participants administered ZS 2.5 g TID as suspension orally for first 48 hours.
141
Acute Phase: ZS 5 g TID
Participants administered ZS 5 g TID as suspension orally for first 48 hours.
157
Acute Phase: ZS 10 TID
Participants administered ZS 10 g TID as suspension orally for first 48 hours.
143
Total753

Withdrawals & dropouts

PeriodReasonFG000FG001FG002FG003FG004FG005FG006FG007FG008FG009FG010FG011FG012FG013FG014
Acute Phase-Initial 48 HoursAdverse Event010110000000000
Acute Phase-Initial 48 HoursFamily emergency000100000000000
Acute Phase-Initial 48 Hourshypo-or hyperkalemia113000000000000
Acute Phase-Initial 48 HoursLost to Follow-up000010000000000
Acute Phase-Initial 48 HoursSponsor's decision010000000000000
Acute Phase-Initial 48 HoursWithdrawal by Subject011410000000000
Subacute PhaseAdverse Event000001111141100
Subacute PhaseDeath000000000010000
Subacute PhaseHypo-or hyperkalemia000000000001010
Subacute PhaseLost to Follow-up000000000000001
Subacute PhasePhysician Decision000000001000000
Subacute PhaseProtocol Violation000001000010000
Subacute PhaseWithdrawal by Subject000001020101110

Baseline characteristics

CharacteristicAcute Phase: Sodium Zirconium Cyclosilicate (ZS) 1.25 g TIDAcute Phase: ZS 2.5 g TIDAcute Phase: ZS 5 g TIDAcute Phase: ZS 10 TIDTotalAcute Phase: Placebo TID
Acute S-K baseline
≤ 5.3 mmol/L
76 Participants72 Participants90 Participants94 Participants427 Participants95 Participants
Acute S-K baseline
5.4-5.5 mmol/L
38 Participants29 Participants36 Participants27 Participants152 Participants22 Participants
Acute S-K baseline
> 5.5 mmol/L
40 Participants40 Participants31 Participants22 Participants174 Participants41 Participants
Age, Customized
Acute Phase
65.4 Years
STANDARD_DEVIATION 13.07
65.9 Years
STANDARD_DEVIATION 11.73
65.2 Years
STANDARD_DEVIATION 11.91
66.2 Years
STANDARD_DEVIATION 12.16
65.6 Years
STANDARD_DEVIATION 12.24
65.6 Years
STANDARD_DEVIATION 12.24
Baseline eGFR
15-29+ ml/min
42 Participants38 Participants43 Participants42 Participants209 Participants44 Participants
Baseline eGFR
<15 ml/min
8 Participants15 Participants8 Participants10 Participants56 Participants15 Participants
Baseline eGFR
30-59+ mL/min
73 Participants48 Participants64 Participants50 Participants296 Participants61 Participants
Baseline eGFR
≥60 mL/min
28 Participants37 Participants39 Participants41 Participants183 Participants38 Participants
Etiology of elevated S-K
Chronic kidney disease
102 Participants89 Participants93 Participants83 Participants463 Participants96 Participants
Etiology of elevated S-K
Congestive heart failure
57 Participants54 Participants64 Participants59 Participants300 Participants66 Participants
Etiology of elevated S-K
Diabetes mellitus
94 Participants84 Participants96 Participants81 Participants451 Participants96 Participants
Etiology of elevated S-K
RAAS inhibitor medication
109 Participants97 Participants99 Participants96 Participants502 Participants101 Participants
Race/Ethnicity, Customized
American Indian or Alaska Native
0 Participants0 Participants1 Participants1 Participants4 Participants2 Participants
Race/Ethnicity, Customized
Asian
0 Participants5 Participants3 Participants2 Participants12 Participants2 Participants
Race/Ethnicity, Customized
Black or African American
20 Participants11 Participants20 Participants19 Participants87 Participants17 Participants
Race/Ethnicity, Customized
Multiple Races
0 Participants1 Participants0 Participants0 Participants1 Participants0 Participants
Race/Ethnicity, Customized
Native Hawaiian or other Pacific Islander
3 Participants0 Participants0 Participants1 Participants5 Participants1 Participants
Race/Ethnicity, Customized
Other
0 Participants1 Participants1 Participants0 Participants2 Participants0 Participants
Race/Ethnicity, Customized
White
131 Participants125 Participants132 Participants120 Participants644 Participants136 Participants
Sex/Gender, Customized
Female
71 Participants50 Participants61 Participants63 Participants305 Participants60 Participants
Sex/Gender, Customized
Male
83 Participants91 Participants96 Participants80 Participants448 Participants98 Participants

Adverse events

Event typeEG000
affected / at risk
EG001
affected / at risk
EG002
affected / at risk
EG003
affected / at risk
EG004
affected / at risk
EG005
affected / at risk
EG006
affected / at risk
EG007
affected / at risk
EG008
affected / at risk
EG009
affected / at risk
EG010
affected / at risk
EG011
affected / at risk
EG012
affected / at risk
EG013
affected / at risk
EG014
affected / at risk
deaths
Total, all-cause mortality
— / —— / —— / —— / —— / —— / —— / —— / —— / —— / —— / —— / —— / —— / —— / —
other
Total, other adverse events
9 / 15818 / 1546 / 1416 / 15710 / 14314 / 4110 / 497 / 4613 / 5412 / 6814 / 656 / 6116 / 638 / 466 / 50
serious
Total, serious adverse events
1 / 1580 / 1540 / 1410 / 1570 / 1431 / 412 / 491 / 462 / 542 / 683 / 651 / 611 / 631 / 461 / 50

Outcome results

Primary

Exponential Rate of Change in Serum Potassium (S-K) Levels During the Initial 48 Hours of Study Drug Treatment.

Time frame: Through 48 hours acute phase

Population: ITT Population

ArmMeasureGroupValue (MEAN)Dispersion
Acute Phase: Placebo TIDExponential Rate of Change in Serum Potassium (S-K) Levels During the Initial 48 Hours of Study Drug Treatment.Through 24 Hours-0.00128 log(mmol/L)/hourStandard Error 0.000243
Acute Phase: Placebo TIDExponential Rate of Change in Serum Potassium (S-K) Levels During the Initial 48 Hours of Study Drug Treatment.Through 48 Hours-0.00097 log(mmol/L)/hourStandard Error 0.000137
Acute Phase: Sodium Zirconium Cyclosilicate (ZS) 1.25 g TIDExponential Rate of Change in Serum Potassium (S-K) Levels During the Initial 48 Hours of Study Drug Treatment.Through 24 Hours-0.00187 log(mmol/L)/hourStandard Error 0.00025
Acute Phase: Sodium Zirconium Cyclosilicate (ZS) 1.25 g TIDExponential Rate of Change in Serum Potassium (S-K) Levels During the Initial 48 Hours of Study Drug Treatment.Through 48 Hours-0.00110 log(mmol/L)/hourStandard Error 0.000141
Acute Phase: ZS 2.5 g TIDExponential Rate of Change in Serum Potassium (S-K) Levels During the Initial 48 Hours of Study Drug Treatment.Through 24 Hours-0.00205 log(mmol/L)/hourStandard Error 0.000263
Acute Phase: ZS 2.5 g TIDExponential Rate of Change in Serum Potassium (S-K) Levels During the Initial 48 Hours of Study Drug Treatment.Through 48 Hours-0.00163 log(mmol/L)/hourStandard Error 0.000148
Acute Phase: ZS 5 g TIDExponential Rate of Change in Serum Potassium (S-K) Levels During the Initial 48 Hours of Study Drug Treatment.Through 48 Hours-0.00223 log(mmol/L)/hourStandard Error 0.000141
Acute Phase: ZS 5 g TIDExponential Rate of Change in Serum Potassium (S-K) Levels During the Initial 48 Hours of Study Drug Treatment.Through 24 Hours-0.00280 log(mmol/L)/hourStandard Error 0.00025
Acute Phase: ZS 10 g TIDExponential Rate of Change in Serum Potassium (S-K) Levels During the Initial 48 Hours of Study Drug Treatment.Through 24 Hours-0.00382 log(mmol/L)/hourStandard Error 0.000258
Acute Phase: ZS 10 g TIDExponential Rate of Change in Serum Potassium (S-K) Levels During the Initial 48 Hours of Study Drug Treatment.Through 48 Hours-0.00321 log(mmol/L)/hourStandard Error 0.000145
Primary

Exponential Rate of Change in S-K Levels in the Subacute Phase.

Time frame: Through 12 days subacute phase (Day 3 through Day 15)

Population: ITT population. One subject in the ZS 5 g TID/5 g QD group died on Study Day 4 and was excluded from the ITT Population

ArmMeasureGroupValue (MEAN)Dispersion
Acute Phase: Placebo TIDExponential Rate of Change in S-K Levels in the Subacute Phase.Through Day 80.00054 log(mmol/L)/hourStandard Error 0.004803
Acute Phase: Placebo TIDExponential Rate of Change in S-K Levels in the Subacute Phase.Through Day 150.00085 log(mmol/L)/hourStandard Error 0.001089
Acute Phase: Sodium Zirconium Cyclosilicate (ZS) 1.25 g TIDExponential Rate of Change in S-K Levels in the Subacute Phase.Through Day 80.00874 log(mmol/L)/hourStandard Error 0.004308
Acute Phase: Sodium Zirconium Cyclosilicate (ZS) 1.25 g TIDExponential Rate of Change in S-K Levels in the Subacute Phase.Through Day 150.00198 log(mmol/L)/hourStandard Error 0.000959
Acute Phase: ZS 2.5 g TIDExponential Rate of Change in S-K Levels in the Subacute Phase.Through Day 80.01104 log(mmol/L)/hourStandard Error 0.004123
Acute Phase: ZS 2.5 g TIDExponential Rate of Change in S-K Levels in the Subacute Phase.Through Day 150.00206 log(mmol/L)/hourStandard Error 0.001189
Acute Phase: ZS 5 g TIDExponential Rate of Change in S-K Levels in the Subacute Phase.Through Day 80.00734 log(mmol/L)/hourStandard Error 0.003642
Acute Phase: ZS 5 g TIDExponential Rate of Change in S-K Levels in the Subacute Phase.Through Day 150.00237 log(mmol/L)/hourStandard Error 0.001049
Acute Phase: ZS 10 g TIDExponential Rate of Change in S-K Levels in the Subacute Phase.Through Day 150.00457 log(mmol/L)/hourStandard Error 0.001007
Acute Phase: ZS 10 g TIDExponential Rate of Change in S-K Levels in the Subacute Phase.Through Day 80.01441 log(mmol/L)/hourStandard Error 0.003776
Subacute Phase: ZS 5 g QDExponential Rate of Change in S-K Levels in the Subacute Phase.Through Day 150.00089 log(mmol/L)/hourStandard Error 0.001049
Subacute Phase: ZS 5 g QDExponential Rate of Change in S-K Levels in the Subacute Phase.Through Day 80.00581 log(mmol/L)/hourStandard Error 0.003918
Subacute Phase: Placebo Matched to ZS 10 g QDExponential Rate of Change in S-K Levels in the Subacute Phase.Through Day 150.00979 log(mmol/L)/hourStandard Error 0.001115
Subacute Phase: Placebo Matched to ZS 10 g QDExponential Rate of Change in S-K Levels in the Subacute Phase.Through Day 80.02469 log(mmol/L)/hourStandard Error 0.003939
Subacute Phase: ZS 10 g QDExponential Rate of Change in S-K Levels in the Subacute Phase.Through Day 8-0.00053 log(mmol/L)/hourStandard Error 0.003877
Subacute Phase: ZS 10 g QDExponential Rate of Change in S-K Levels in the Subacute Phase.Through Day 150.00136 log(mmol/L)/hourStandard Error 0.001097
Subacute Phase: ZS 1.25 (Acute Phase: Placebo)Exponential Rate of Change in S-K Levels in the Subacute Phase.Through Day 80.00643 log(mmol/L)/hourStandard Error 0.004171
Subacute Phase: ZS 1.25 (Acute Phase: Placebo)Exponential Rate of Change in S-K Levels in the Subacute Phase.Through Day 15-0.00098 log(mmol/L)/hourStandard Error 0.001054
Subacute Phase: ZS 2.5 g ( Acute Phase: Placebo)Exponential Rate of Change in S-K Levels in the Subacute Phase.Through Day 80.00390 log(mmol/L)/hourStandard Error 0.004023
Subacute Phase: ZS 2.5 g ( Acute Phase: Placebo)Exponential Rate of Change in S-K Levels in the Subacute Phase.Through Day 150.00023 log(mmol/L)/hourStandard Error 0.001004
Secondary

Mean Change From Baseline in S-K at All Time Points Acute Phase

Mean change from baseline in S-K at all time points over initial 48 hours

Time frame: Through 48 hours acute phase. In particular, at Baseline; 1, 2, 4 hour Post 1st Dose on Study Day 1; 0 hour Pre-dose, 1, 4 hour Post 1st Dose on Study Day 2; and 0 hour Pre-dose on Study Day 3.

Population: ITT population

ArmMeasureGroupValue (MEAN)Dispersion
Acute Phase: Placebo TIDMean Change From Baseline in S-K at All Time Points Acute PhaseBaseline, mean5.30 mmol/LStandard Deviation 0.365
Acute Phase: Placebo TIDMean Change From Baseline in S-K at All Time Points Acute PhaseStudy Day 1: 1 hour Post 1st Dose0.01 mmol/LStandard Deviation 0.404
Acute Phase: Placebo TIDMean Change From Baseline in S-K at All Time Points Acute PhaseStudy Day 1: 2 hour Post 1st Dose0.00 mmol/LStandard Deviation 0.423
Acute Phase: Placebo TIDMean Change From Baseline in S-K at All Time Points Acute PhaseStudy Day 1: 4 hour Post 1st Dose-0.22 mmol/LStandard Deviation 0.429
Acute Phase: Placebo TIDMean Change From Baseline in S-K at All Time Points Acute PhaseStudy Day 2: 0 hour Pre-dose-0.18 mmol/LStandard Deviation 0.363
Acute Phase: Placebo TIDMean Change From Baseline in S-K at All Time Points Acute PhaseStudy Day 2: 1 hour Post 1st Dose-0.24 mmol/LStandard Deviation 0.484
Acute Phase: Placebo TIDMean Change From Baseline in S-K at All Time Points Acute PhaseStudy Day 2: 4 hour Post 1st Dose-0.22 mmol/LStandard Deviation 0.44
Acute Phase: Placebo TIDMean Change From Baseline in S-K at All Time Points Acute PhaseStudy Day 3: 0 hour Pre-dose-0.25 mmol/LStandard Deviation 0.413
Acute Phase: Sodium Zirconium Cyclosilicate (ZS) 1.25 g TIDMean Change From Baseline in S-K at All Time Points Acute PhaseStudy Day 1: 2 hour Post 1st Dose-0.04 mmol/LStandard Deviation 0.366
Acute Phase: Sodium Zirconium Cyclosilicate (ZS) 1.25 g TIDMean Change From Baseline in S-K at All Time Points Acute PhaseStudy Day 2: 1 hour Post 1st Dose-0.27 mmol/LStandard Deviation 0.415
Acute Phase: Sodium Zirconium Cyclosilicate (ZS) 1.25 g TIDMean Change From Baseline in S-K at All Time Points Acute PhaseBaseline, mean5.37 mmol/LStandard Deviation 0.369
Acute Phase: Sodium Zirconium Cyclosilicate (ZS) 1.25 g TIDMean Change From Baseline in S-K at All Time Points Acute PhaseStudy Day 1: 4 hour Post 1st Dose-0.28 mmol/LStandard Deviation 0.425
Acute Phase: Sodium Zirconium Cyclosilicate (ZS) 1.25 g TIDMean Change From Baseline in S-K at All Time Points Acute PhaseStudy Day 1: 1 hour Post 1st Dose-0.01 mmol/LStandard Deviation 0.36
Acute Phase: Sodium Zirconium Cyclosilicate (ZS) 1.25 g TIDMean Change From Baseline in S-K at All Time Points Acute PhaseStudy Day 3: 0 hour Pre-dose-0.30 mmol/LStandard Deviation 0.404
Acute Phase: Sodium Zirconium Cyclosilicate (ZS) 1.25 g TIDMean Change From Baseline in S-K at All Time Points Acute PhaseStudy Day 2: 0 hour Pre-dose-0.28 mmol/LStandard Deviation 0.393
Acute Phase: Sodium Zirconium Cyclosilicate (ZS) 1.25 g TIDMean Change From Baseline in S-K at All Time Points Acute PhaseStudy Day 2: 4 hour Post 1st Dose-0.32 mmol/LStandard Deviation 0.449
Acute Phase: ZS 2.5 g TIDMean Change From Baseline in S-K at All Time Points Acute PhaseStudy Day 2: 4 hour Post 1st Dose-0.40 mmol/LStandard Deviation 0.462
Acute Phase: ZS 2.5 g TIDMean Change From Baseline in S-K at All Time Points Acute PhaseStudy Day 3: 0 hour Pre-dose-0.46 mmol/LStandard Deviation 0.398
Acute Phase: ZS 2.5 g TIDMean Change From Baseline in S-K at All Time Points Acute PhaseStudy Day 1: 4 hour Post 1st Dose-0.34 mmol/LStandard Deviation 0.409
Acute Phase: ZS 2.5 g TIDMean Change From Baseline in S-K at All Time Points Acute PhaseStudy Day 2: 1 hour Post 1st Dose-0.38 mmol/LStandard Deviation 0.479
Acute Phase: ZS 2.5 g TIDMean Change From Baseline in S-K at All Time Points Acute PhaseStudy Day 1: 2 hour Post 1st Dose-0.06 mmol/LStandard Deviation 0.499
Acute Phase: ZS 2.5 g TIDMean Change From Baseline in S-K at All Time Points Acute PhaseStudy Day 1: 1 hour Post 1st Dose-0.08 mmol/LStandard Deviation 0.394
Acute Phase: ZS 2.5 g TIDMean Change From Baseline in S-K at All Time Points Acute PhaseBaseline, mean5.35 mmol/LStandard Deviation 0.4
Acute Phase: ZS 2.5 g TIDMean Change From Baseline in S-K at All Time Points Acute PhaseStudy Day 2: 0 hour Pre-dose-0.32 mmol/LStandard Deviation 0.39
Acute Phase: ZS 5 g TIDMean Change From Baseline in S-K at All Time Points Acute PhaseStudy Day 1: 1 hour Post 1st Dose-0.06 mmol/LStandard Deviation 0.413
Acute Phase: ZS 5 g TIDMean Change From Baseline in S-K at All Time Points Acute PhaseStudy Day 1: 2 hour Post 1st Dose-0.09 mmol/LStandard Deviation 0.355
Acute Phase: ZS 5 g TIDMean Change From Baseline in S-K at All Time Points Acute PhaseStudy Day 1: 4 hour Post 1st Dose-0.31 mmol/LStandard Deviation 0.389
Acute Phase: ZS 5 g TIDMean Change From Baseline in S-K at All Time Points Acute PhaseStudy Day 2: 0 hour Pre-dose-0.40 mmol/LStandard Deviation 0.375
Acute Phase: ZS 5 g TIDMean Change From Baseline in S-K at All Time Points Acute PhaseStudy Day 2: 1 hour Post 1st Dose-0.46 mmol/LStandard Deviation 0.44
Acute Phase: ZS 5 g TIDMean Change From Baseline in S-K at All Time Points Acute PhaseStudy Day 3: 0 hour Pre-dose-0.54 mmol/LStandard Deviation 0.459
Acute Phase: ZS 5 g TIDMean Change From Baseline in S-K at All Time Points Acute PhaseBaseline, mean5.31 mmol/LStandard Deviation 0.337
Acute Phase: ZS 5 g TIDMean Change From Baseline in S-K at All Time Points Acute PhaseStudy Day 2: 4 hour Post 1st Dose-0.47 mmol/LStandard Deviation 0.465
Acute Phase: ZS 10 g TIDMean Change From Baseline in S-K at All Time Points Acute PhaseStudy Day 1: 4 hour Post 1st Dose-0.37 mmol/LStandard Deviation 0.445
Acute Phase: ZS 10 g TIDMean Change From Baseline in S-K at All Time Points Acute PhaseStudy Day 3: 0 hour Pre-dose-0.73 mmol/LStandard Deviation 0.496
Acute Phase: ZS 10 g TIDMean Change From Baseline in S-K at All Time Points Acute PhaseStudy Day 1: 2 hour Post 1st Dose-0.18 mmol/LStandard Deviation 0.36
Acute Phase: ZS 10 g TIDMean Change From Baseline in S-K at All Time Points Acute PhaseStudy Day 2: 4 hour Post 1st Dose-0.62 mmol/LStandard Deviation 0.42
Acute Phase: ZS 10 g TIDMean Change From Baseline in S-K at All Time Points Acute PhaseBaseline, mean5.26 mmol/LStandard Deviation 0.337
Acute Phase: ZS 10 g TIDMean Change From Baseline in S-K at All Time Points Acute PhaseStudy Day 2: 1 hour Post 1st Dose-0.68 mmol/LStandard Deviation 0.437
Acute Phase: ZS 10 g TIDMean Change From Baseline in S-K at All Time Points Acute PhaseStudy Day 1: 1 hour Post 1st Dose-0.11 mmol/LStandard Deviation 0.361
Acute Phase: ZS 10 g TIDMean Change From Baseline in S-K at All Time Points Acute PhaseStudy Day 2: 0 hour Pre-dose-0.52 mmol/LStandard Deviation 0.364
Secondary

Mean Change From Subacute Baseline in Serum Potassium at All Time Points.

Mean change from subacute baseline in serum potassium at all time points during subacute phase

Time frame: Through 18 days of subacute phase (12 days treatment, 6 days follow-up)

Population: ITT population. One subject (087-025) in the ZS 5 g TID/5 g QD group died on Study Day 4 and was excluded from the ITT Population

ArmMeasureGroupValue (MEAN)Dispersion
Acute Phase: Placebo TIDMean Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Baseline, mean4.81 mmol/LStandard Deviation 0.324
Acute Phase: Placebo TIDMean Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 180.06 mmol/LStandard Deviation 0.474
Acute Phase: Placebo TIDMean Change From Subacute Baseline in Serum Potassium at All Time Points.Acute Baseline, mean5.22 mmol/LStandard Deviation 0.263
Acute Phase: Placebo TIDMean Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 2-0.06 mmol/LStandard Deviation 0.575
Acute Phase: Placebo TIDMean Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 10.02 mmol/LStandard Deviation 0.362
Acute Phase: Placebo TIDMean Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 60.11 mmol/LStandard Deviation 0.385
Acute Phase: Placebo TIDMean Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 120.04 mmol/LStandard Deviation 0.477
Acute Phase: Placebo TIDMean Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 30.04 mmol/LStandard Deviation 0.387
Acute Phase: Sodium Zirconium Cyclosilicate (ZS) 1.25 g TIDMean Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 180.22 mmol/LStandard Deviation 0.459
Acute Phase: Sodium Zirconium Cyclosilicate (ZS) 1.25 g TIDMean Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 60.07 mmol/LStandard Deviation 0.411
Acute Phase: Sodium Zirconium Cyclosilicate (ZS) 1.25 g TIDMean Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 120.18 mmol/LStandard Deviation 0.368
Acute Phase: Sodium Zirconium Cyclosilicate (ZS) 1.25 g TIDMean Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Baseline, mean4.80 mmol/LStandard Deviation 0.391
Acute Phase: Sodium Zirconium Cyclosilicate (ZS) 1.25 g TIDMean Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 30.11 mmol/LStandard Deviation 0.432
Acute Phase: Sodium Zirconium Cyclosilicate (ZS) 1.25 g TIDMean Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 20.13 mmol/LStandard Deviation 0.405
Acute Phase: Sodium Zirconium Cyclosilicate (ZS) 1.25 g TIDMean Change From Subacute Baseline in Serum Potassium at All Time Points.Acute Baseline, mean5.29 mmol/LStandard Deviation 0.343
Acute Phase: Sodium Zirconium Cyclosilicate (ZS) 1.25 g TIDMean Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 10.15 mmol/LStandard Deviation 0.416
Acute Phase: ZS 2.5 g TIDMean Change From Subacute Baseline in Serum Potassium at All Time Points.Acute Baseline, mean5.25 mmol/LStandard Deviation 0.268
Acute Phase: ZS 2.5 g TIDMean Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 180.09 mmol/LStandard Deviation 0.442
Acute Phase: ZS 2.5 g TIDMean Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 60.22 mmol/LStandard Deviation 0.532
Acute Phase: ZS 2.5 g TIDMean Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 120.18 mmol/LStandard Deviation 0.52
Acute Phase: ZS 2.5 g TIDMean Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 30.17 mmol/LStandard Deviation 0.431
Acute Phase: ZS 2.5 g TIDMean Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Baseline, mean4.77 mmol/LStandard Deviation 0.349
Acute Phase: ZS 2.5 g TIDMean Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 10.21 mmol/LStandard Deviation 0.416
Acute Phase: ZS 2.5 g TIDMean Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 20.07 mmol/LStandard Deviation 0.451
Acute Phase: ZS 5 g TIDMean Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 30.18 mmol/LStandard Deviation 0.35
Acute Phase: ZS 5 g TIDMean Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 120.23 mmol/LStandard Deviation 0.451
Acute Phase: ZS 5 g TIDMean Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Baseline, mean4.66 mmol/LStandard Deviation 0.336
Acute Phase: ZS 5 g TIDMean Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 60.12 mmol/LStandard Deviation 0.356
Acute Phase: ZS 5 g TIDMean Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 10.11 mmol/LStandard Deviation 0.329
Acute Phase: ZS 5 g TIDMean Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 180.18 mmol/LStandard Deviation 0.522
Acute Phase: ZS 5 g TIDMean Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 20.05 mmol/LStandard Deviation 0.36
Acute Phase: ZS 5 g TIDMean Change From Subacute Baseline in Serum Potassium at All Time Points.Acute Baseline, mean5.23 mmol/LStandard Deviation 0.354
Acute Phase: ZS 10 g TIDMean Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 180.26 mmol/LStandard Deviation 0.555
Acute Phase: ZS 10 g TIDMean Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Baseline, mean4.76 mmol/LStandard Deviation 0.44
Acute Phase: ZS 10 g TIDMean Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 30.17 mmol/LStandard Deviation 0.503
Acute Phase: ZS 10 g TIDMean Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 20.12 mmol/LStandard Deviation 0.477
Acute Phase: ZS 10 g TIDMean Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 120.24 mmol/LStandard Deviation 0.584
Acute Phase: ZS 10 g TIDMean Change From Subacute Baseline in Serum Potassium at All Time Points.Acute Baseline, mean5.31 mmol/LStandard Deviation 0.302
Acute Phase: ZS 10 g TIDMean Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 10.07 mmol/LStandard Deviation 0.493
Acute Phase: ZS 10 g TIDMean Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 60.27 mmol/LStandard Deviation 0.56
Subacute Phase: ZS 5 g QDMean Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 20.10 mmol/LStandard Deviation 0.519
Subacute Phase: ZS 5 g QDMean Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 180.30 mmol/LStandard Deviation 0.539
Subacute Phase: ZS 5 g QDMean Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Baseline, mean4.63 mmol/LStandard Deviation 0.357
Subacute Phase: ZS 5 g QDMean Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 10.12 mmol/LStandard Deviation 0.446
Subacute Phase: ZS 5 g QDMean Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 30.11 mmol/LStandard Deviation 0.499
Subacute Phase: ZS 5 g QDMean Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 60.11 mmol/LStandard Deviation 0.51
Subacute Phase: ZS 5 g QDMean Change From Subacute Baseline in Serum Potassium at All Time Points.Acute Baseline, mean5.24 mmol/LStandard Deviation 0.325
Subacute Phase: ZS 5 g QDMean Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 120.14 mmol/LStandard Deviation 0.532
Subacute Phase: Placebo Matched to ZS 10 g QDMean Change From Subacute Baseline in Serum Potassium at All Time Points.Acute Baseline, mean5.24 mmol/LStandard Deviation 0.29
Subacute Phase: Placebo Matched to ZS 10 g QDMean Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 60.43 mmol/LStandard Deviation 0.467
Subacute Phase: Placebo Matched to ZS 10 g QDMean Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 120.58 mmol/LStandard Deviation 0.485
Subacute Phase: Placebo Matched to ZS 10 g QDMean Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Baseline, mean4.42 mmol/LStandard Deviation 0.353
Subacute Phase: Placebo Matched to ZS 10 g QDMean Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 30.37 mmol/LStandard Deviation 0.426
Subacute Phase: Placebo Matched to ZS 10 g QDMean Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 10.13 mmol/LStandard Deviation 0.363
Subacute Phase: Placebo Matched to ZS 10 g QDMean Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 180.59 mmol/LStandard Deviation 0.504
Subacute Phase: Placebo Matched to ZS 10 g QDMean Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 20.28 mmol/LStandard Deviation 0.387
Subacute Phase: ZS 10 g QDMean Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 180.44 mmol/LStandard Deviation 0.652
Subacute Phase: ZS 10 g QDMean Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 10.00 mmol/LStandard Deviation 0.452
Subacute Phase: ZS 10 g QDMean Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Baseline, mean4.52 mmol/LStandard Deviation 0.448
Subacute Phase: ZS 10 g QDMean Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 60.10 mmol/LStandard Deviation 0.573
Subacute Phase: ZS 10 g QDMean Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 3-0.06 mmol/LStandard Deviation 0.557
Subacute Phase: ZS 10 g QDMean Change From Subacute Baseline in Serum Potassium at All Time Points.Acute Baseline, mean5.27 mmol/LStandard Deviation 0.369
Subacute Phase: ZS 10 g QDMean Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 120.06 mmol/LStandard Deviation 0.564
Subacute Phase: ZS 10 g QDMean Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 20.00 mmol/LStandard Deviation 0.531
Subacute Phase: ZS 1.25 (Acute Phase: Placebo)Mean Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 12-0.01 mmol/LStandard Deviation 0.438
Subacute Phase: ZS 1.25 (Acute Phase: Placebo)Mean Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 180.09 mmol/LStandard Deviation 0.477
Subacute Phase: ZS 1.25 (Acute Phase: Placebo)Mean Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Baseline, mean4.81 mmol/LStandard Deviation 0.348
Subacute Phase: ZS 1.25 (Acute Phase: Placebo)Mean Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 10.05 mmol/LStandard Deviation 0.373
Subacute Phase: ZS 1.25 (Acute Phase: Placebo)Mean Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 20.07 mmol/LStandard Deviation 0.437
Subacute Phase: ZS 1.25 (Acute Phase: Placebo)Mean Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 60.04 mmol/LStandard Deviation 0.409
Subacute Phase: ZS 1.25 (Acute Phase: Placebo)Mean Change From Subacute Baseline in Serum Potassium at All Time Points.Acute Baseline, mean5.15 mmol/LStandard Deviation 0.293
Subacute Phase: ZS 1.25 (Acute Phase: Placebo)Mean Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 30.11 mmol/LStandard Deviation 0.4
Subacute Phase: ZS 2.5 g ( Acute Phase: Placebo)Mean Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 180.14 mmol/LStandard Deviation 0.492
Subacute Phase: ZS 2.5 g ( Acute Phase: Placebo)Mean Change From Subacute Baseline in Serum Potassium at All Time Points.Acute Baseline, mean5.19 mmol/LStandard Deviation 0.325
Subacute Phase: ZS 2.5 g ( Acute Phase: Placebo)Mean Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Baseline, mean4.80 mmol/LStandard Deviation 0.379
Subacute Phase: ZS 2.5 g ( Acute Phase: Placebo)Mean Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 10.04 mmol/LStandard Deviation 0.362
Subacute Phase: ZS 2.5 g ( Acute Phase: Placebo)Mean Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 20.12 mmol/LStandard Deviation 0.389
Subacute Phase: ZS 2.5 g ( Acute Phase: Placebo)Mean Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 30.03 mmol/LStandard Deviation 0.501
Subacute Phase: ZS 2.5 g ( Acute Phase: Placebo)Mean Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 60.13 mmol/LStandard Deviation 0.457
Subacute Phase: ZS 2.5 g ( Acute Phase: Placebo)Mean Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 120.04 mmol/LStandard Deviation 0.451
Secondary

Mean Percent Change From Baseline in S-K Change at All Time Points Acute Phase

Mean percent change from baseline in S-K at all time points over initial 48 hours

Time frame: Through 48 hours acute phase. In particular, 1, 2, 4 hour Post 1st Dose on Study Day 1; 0 hour Pre-dose, 1, 4 hour Post 1st Dose on Study Day 2; and 0 hour Pre-dose on Study Day 3.

Population: ITT population

ArmMeasureGroupValue (MEAN)Dispersion
Acute Phase: Placebo TIDMean Percent Change From Baseline in S-K Change at All Time Points Acute PhaseStudy Day 1: 1 hour Post 1st Dose Percent change0.09 percentageStandard Deviation 7.606
Acute Phase: Placebo TIDMean Percent Change From Baseline in S-K Change at All Time Points Acute PhaseStudy Day 3: 0 hour Pre-dose Percent change-4.62 percentageStandard Deviation 7.751
Acute Phase: Placebo TIDMean Percent Change From Baseline in S-K Change at All Time Points Acute PhaseStudy Day 2: 4 hour Post 1st Dose Percent change-4.08 percentageStandard Deviation 8.253
Acute Phase: Placebo TIDMean Percent Change From Baseline in S-K Change at All Time Points Acute PhaseStudy Day 1: 4 hour Post 1st Dose Percent change-4.05 percentageStandard Deviation 8.021
Acute Phase: Placebo TIDMean Percent Change From Baseline in S-K Change at All Time Points Acute PhaseStudy Day 1: 2 hour Post 1st Dose Percent change0.03 percentageStandard Deviation 7.911
Acute Phase: Placebo TIDMean Percent Change From Baseline in S-K Change at All Time Points Acute PhaseStudy Day 2: 0 hour Pre-dose Percent change-3.40 percentageStandard Deviation 6.819
Acute Phase: Placebo TIDMean Percent Change From Baseline in S-K Change at All Time Points Acute PhaseStudy Day 2: 1 hour Post 1st Dose Percent change-4.42 percentageStandard Deviation 8.904
Acute Phase: Sodium Zirconium Cyclosilicate (ZS) 1.25 g TIDMean Percent Change From Baseline in S-K Change at All Time Points Acute PhaseStudy Day 2: 1 hour Post 1st Dose Percent change-4.99 percentageStandard Deviation 7.717
Acute Phase: Sodium Zirconium Cyclosilicate (ZS) 1.25 g TIDMean Percent Change From Baseline in S-K Change at All Time Points Acute PhaseStudy Day 2: 0 hour Pre-dose Percent change-5.14 percentageStandard Deviation 7.19
Acute Phase: Sodium Zirconium Cyclosilicate (ZS) 1.25 g TIDMean Percent Change From Baseline in S-K Change at All Time Points Acute PhaseStudy Day 1: 2 hour Post 1st Dose Percent change-0.81 percentageStandard Deviation 6.813
Acute Phase: Sodium Zirconium Cyclosilicate (ZS) 1.25 g TIDMean Percent Change From Baseline in S-K Change at All Time Points Acute PhaseStudy Day 1: 1 hour Post 1st Dose Percent change-0.23 percentageStandard Deviation 6.732
Acute Phase: Sodium Zirconium Cyclosilicate (ZS) 1.25 g TIDMean Percent Change From Baseline in S-K Change at All Time Points Acute PhaseStudy Day 2: 4 hour Post 1st Dose Percent change-5.82 percentageStandard Deviation 8.187
Acute Phase: Sodium Zirconium Cyclosilicate (ZS) 1.25 g TIDMean Percent Change From Baseline in S-K Change at All Time Points Acute PhaseStudy Day 1: 4 hour Post 1st Dose Percent change-5.20 percentageStandard Deviation 7.842
Acute Phase: Sodium Zirconium Cyclosilicate (ZS) 1.25 g TIDMean Percent Change From Baseline in S-K Change at All Time Points Acute PhaseStudy Day 3: 0 hour Pre-dose Percent change-5.44 percentageStandard Deviation 7.476
Acute Phase: ZS 2.5 g TIDMean Percent Change From Baseline in S-K Change at All Time Points Acute PhaseStudy Day 2: 0 hour Pre-dose Percent change-6.02 percentageStandard Deviation 7.099
Acute Phase: ZS 2.5 g TIDMean Percent Change From Baseline in S-K Change at All Time Points Acute PhaseStudy Day 1: 1 hour Post 1st Dose Percent change-1.37 percentageStandard Deviation 7.273
Acute Phase: ZS 2.5 g TIDMean Percent Change From Baseline in S-K Change at All Time Points Acute PhaseStudy Day 1: 2 hour Post 1st Dose Percent change-0.99 percentageStandard Deviation 9.384
Acute Phase: ZS 2.5 g TIDMean Percent Change From Baseline in S-K Change at All Time Points Acute PhaseStudy Day 1: 4 hour Post 1st Dose Percent change-6.34 percentageStandard Deviation 7.46
Acute Phase: ZS 2.5 g TIDMean Percent Change From Baseline in S-K Change at All Time Points Acute PhaseStudy Day 2: 1 hour Post 1st Dose Percent change-6.95 percentageStandard Deviation 8.91
Acute Phase: ZS 2.5 g TIDMean Percent Change From Baseline in S-K Change at All Time Points Acute PhaseStudy Day 2: 4 hour Post 1st Dose Percent change-7.27 percentageStandard Deviation 8.405
Acute Phase: ZS 2.5 g TIDMean Percent Change From Baseline in S-K Change at All Time Points Acute PhaseStudy Day 3: 0 hour Pre-dose Percent change-8.48 percentageStandard Deviation 7.291
Acute Phase: ZS 5 g TIDMean Percent Change From Baseline in S-K Change at All Time Points Acute PhaseStudy Day 1: 4 hour Post 1st Dose Percent change-5.74 percentageStandard Deviation 7.283
Acute Phase: ZS 5 g TIDMean Percent Change From Baseline in S-K Change at All Time Points Acute PhaseStudy Day 2: 1 hour Post 1st Dose Percent change-8.62 percentageStandard Deviation 8.082
Acute Phase: ZS 5 g TIDMean Percent Change From Baseline in S-K Change at All Time Points Acute PhaseStudy Day 1: 2 hour Post 1st Dose Percent change-1.71 percentageStandard Deviation 6.725
Acute Phase: ZS 5 g TIDMean Percent Change From Baseline in S-K Change at All Time Points Acute PhaseStudy Day 3: 0 hour Pre-dose Percent change-10.04 percentageStandard Deviation 8.33
Acute Phase: ZS 5 g TIDMean Percent Change From Baseline in S-K Change at All Time Points Acute PhaseStudy Day 2: 4 hour Post 1st Dose Percent change-8.63 percentageStandard Deviation 8.541
Acute Phase: ZS 5 g TIDMean Percent Change From Baseline in S-K Change at All Time Points Acute PhaseStudy Day 1: 1 hour Post 1st Dose Percent change-1.13 percentageStandard Deviation 7.791
Acute Phase: ZS 5 g TIDMean Percent Change From Baseline in S-K Change at All Time Points Acute PhaseStudy Day 2: 0 hour Pre-dose Percent change-7.31 percentageStandard Deviation 6.942
Acute Phase: ZS 10 g TIDMean Percent Change From Baseline in S-K Change at All Time Points Acute PhaseStudy Day 1: 4 hour Post 1st Dose Percent change-6.91 percentageStandard Deviation 8.249
Acute Phase: ZS 10 g TIDMean Percent Change From Baseline in S-K Change at All Time Points Acute PhaseStudy Day 3: 0 hour Pre-dose Percent change-13.76 percentageStandard Deviation 9.044
Acute Phase: ZS 10 g TIDMean Percent Change From Baseline in S-K Change at All Time Points Acute PhaseStudy Day 2: 4 hour Post 1st Dose Percent change-11.58 percentageStandard Deviation 7.645
Acute Phase: ZS 10 g TIDMean Percent Change From Baseline in S-K Change at All Time Points Acute PhaseStudy Day 2: 1 hour Post 1st Dose Percent change-12.70 percentageStandard Deviation 8.091
Acute Phase: ZS 10 g TIDMean Percent Change From Baseline in S-K Change at All Time Points Acute PhaseStudy Day 1: 2 hour Post 1st Dose Percent change-3.43 percentageStandard Deviation 6.779
Acute Phase: ZS 10 g TIDMean Percent Change From Baseline in S-K Change at All Time Points Acute PhaseStudy Day 1: 1 hour Post 1st Dose Percent change-2.08 percentageStandard Deviation 6.873
Acute Phase: ZS 10 g TIDMean Percent Change From Baseline in S-K Change at All Time Points Acute PhaseStudy Day 2: 0 hour Pre-dose Percent change-9.85 percentageStandard Deviation 6.693
Secondary

Mean Percent Change From Subacute Baseline in Serum Potassium at All Time Points.

Mean percent change from subacute baseline in serum potassium at all time points during subacute phase

Time frame: Through 18 days of subacute phase (12 days treatment, 6 days follow-up)

Population: ITT population. One subject (087-025) in the ZS 5 g TID/5 g QD group died on Study Day 4 and was excluded from the ITT Population

ArmMeasureGroupValue (MEAN)Dispersion
Acute Phase: Placebo TIDMean Percent Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 1 Percent Change0.66 percentageStandard Deviation 7.386
Acute Phase: Placebo TIDMean Percent Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 3 Percent Change1.15 percentageStandard Deviation 7.93
Acute Phase: Placebo TIDMean Percent Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 18 Percent Change1.56 percentageStandard Deviation 10.145
Acute Phase: Placebo TIDMean Percent Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 12 Percent Change1.13 percentageStandard Deviation 9.955
Acute Phase: Placebo TIDMean Percent Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 2 Percent Change-1.05 percentageStandard Deviation 12.031
Acute Phase: Placebo TIDMean Percent Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 6 Percent Change2.46 percentageStandard Deviation 8.048
Acute Phase: Sodium Zirconium Cyclosilicate (ZS) 1.25 g TIDMean Percent Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 2 Percent Change2.79 percentageStandard Deviation 8.465
Acute Phase: Sodium Zirconium Cyclosilicate (ZS) 1.25 g TIDMean Percent Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 12 Percent Change3.95 percentageStandard Deviation 7.55
Acute Phase: Sodium Zirconium Cyclosilicate (ZS) 1.25 g TIDMean Percent Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 3 Percent Change2.56 percentageStandard Deviation 9.098
Acute Phase: Sodium Zirconium Cyclosilicate (ZS) 1.25 g TIDMean Percent Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 1 Percent Change3.31 percentageStandard Deviation 8.848
Acute Phase: Sodium Zirconium Cyclosilicate (ZS) 1.25 g TIDMean Percent Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 6 Percent Change1.58 percentageStandard Deviation 8.271
Acute Phase: Sodium Zirconium Cyclosilicate (ZS) 1.25 g TIDMean Percent Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 18 Percent Change4.73 percentageStandard Deviation 10.015
Acute Phase: ZS 2.5 g TIDMean Percent Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 1 Percent Change4.74 percentageStandard Deviation 8.819
Acute Phase: ZS 2.5 g TIDMean Percent Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 18 Percent Change2.19 percentageStandard Deviation 9.338
Acute Phase: ZS 2.5 g TIDMean Percent Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 2 Percent Change1.79 percentageStandard Deviation 9.198
Acute Phase: ZS 2.5 g TIDMean Percent Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 12 Percent Change4.16 percentageStandard Deviation 10.727
Acute Phase: ZS 2.5 g TIDMean Percent Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 6 Percent Change4.83 percentageStandard Deviation 10.881
Acute Phase: ZS 2.5 g TIDMean Percent Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 3 Percent Change3.79 percentageStandard Deviation 8.956
Acute Phase: ZS 5 g TIDMean Percent Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 6 Percent Change2.90 percentageStandard Deviation 7.769
Acute Phase: ZS 5 g TIDMean Percent Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 3 Percent Change4.12 percentageStandard Deviation 7.87
Acute Phase: ZS 5 g TIDMean Percent Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 18 Percent Change4.35 percentageStandard Deviation 11.587
Acute Phase: ZS 5 g TIDMean Percent Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 1 Percent Change2.58 percentageStandard Deviation 7.055
Acute Phase: ZS 5 g TIDMean Percent Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 2 Percent Change1.30 percentageStandard Deviation 7.766
Acute Phase: ZS 5 g TIDMean Percent Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 12 Percent Change5.33 percentageStandard Deviation 9.976
Acute Phase: ZS 10 g TIDMean Percent Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 2 Percent Change2.96 percentageStandard Deviation 8.913
Acute Phase: ZS 10 g TIDMean Percent Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 1 Percent Change2.03 percentageStandard Deviation 9.511
Acute Phase: ZS 10 g TIDMean Percent Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 3 Percent Change4.15 percentageStandard Deviation 9.464
Acute Phase: ZS 10 g TIDMean Percent Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 6 Percent Change6.16 percentageStandard Deviation 11.061
Acute Phase: ZS 10 g TIDMean Percent Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 12 Percent Change5.67 percentageStandard Deviation 12.4
Acute Phase: ZS 10 g TIDMean Percent Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 18 Percent Change6.00 percentageStandard Deviation 11.393
Subacute Phase: ZS 5 g QDMean Percent Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 3 Percent Change2.82 percentageStandard Deviation 11.259
Subacute Phase: ZS 5 g QDMean Percent Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 2 Percent Change2.54 percentageStandard Deviation 11.925
Subacute Phase: ZS 5 g QDMean Percent Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 18 Percent Change7.07 percentageStandard Deviation 11.918
Subacute Phase: ZS 5 g QDMean Percent Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 1 Percent Change2.90 percentageStandard Deviation 9.738
Subacute Phase: ZS 5 g QDMean Percent Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 12 Percent Change3.53 percentageStandard Deviation 11.664
Subacute Phase: ZS 5 g QDMean Percent Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 6 Percent Change2.84 percentageStandard Deviation 11.565
Subacute Phase: Placebo Matched to ZS 10 g QDMean Percent Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 3 Percent Change8.73 percentageStandard Deviation 9.982
Subacute Phase: Placebo Matched to ZS 10 g QDMean Percent Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 6 Percent Change10.22 percentageStandard Deviation 11.027
Subacute Phase: Placebo Matched to ZS 10 g QDMean Percent Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 2 Percent Change6.58 percentageStandard Deviation 8.908
Subacute Phase: Placebo Matched to ZS 10 g QDMean Percent Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 12 Percent Change13.52 percentageStandard Deviation 11.493
Subacute Phase: Placebo Matched to ZS 10 g QDMean Percent Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 1 Percent Change3.15 percentageStandard Deviation 8.368
Subacute Phase: Placebo Matched to ZS 10 g QDMean Percent Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 18 Percent Change13.80 percentageStandard Deviation 12.182
Subacute Phase: ZS 10 g QDMean Percent Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 6 Percent Change2.90 percentageStandard Deviation 12.396
Subacute Phase: ZS 10 g QDMean Percent Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 18 Percent Change10.38 percentageStandard Deviation 14.581
Subacute Phase: ZS 10 g QDMean Percent Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 3 Percent Change-0.52 percentageStandard Deviation 11.59
Subacute Phase: ZS 10 g QDMean Percent Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 12 Percent Change1.88 percentageStandard Deviation 12.344
Subacute Phase: ZS 10 g QDMean Percent Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 1 Percent Change0.45 percentageStandard Deviation 9.412
Subacute Phase: ZS 10 g QDMean Percent Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 2 Percent Change0.67 percentageStandard Deviation 11.555
Subacute Phase: ZS 1.25 (Acute Phase: Placebo)Mean Percent Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 1 Percent Change1.26 percentageStandard Deviation 7.859
Subacute Phase: ZS 1.25 (Acute Phase: Placebo)Mean Percent Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 3 Percent Change2.49 percentageStandard Deviation 8.51
Subacute Phase: ZS 1.25 (Acute Phase: Placebo)Mean Percent Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 18 Percent Change1.94 percentageStandard Deviation 10.241
Subacute Phase: ZS 1.25 (Acute Phase: Placebo)Mean Percent Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 2 Percent Change1.59 percentageStandard Deviation 8.948
Subacute Phase: ZS 1.25 (Acute Phase: Placebo)Mean Percent Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 6 Percent Change1.18 percentageStandard Deviation 8.583
Subacute Phase: ZS 1.25 (Acute Phase: Placebo)Mean Percent Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 12 Percent Change0.07 percentageStandard Deviation 9.117
Subacute Phase: ZS 2.5 g ( Acute Phase: Placebo)Mean Percent Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 6 Percent Change3.05 percentageStandard Deviation 9.397
Subacute Phase: ZS 2.5 g ( Acute Phase: Placebo)Mean Percent Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 12 Percent Change1.10 percentageStandard Deviation 9.679
Subacute Phase: ZS 2.5 g ( Acute Phase: Placebo)Mean Percent Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 3 Percent Change1.12 percentageStandard Deviation 10.533
Subacute Phase: ZS 2.5 g ( Acute Phase: Placebo)Mean Percent Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 18 Percent Change3.01 percentageStandard Deviation 10.301
Subacute Phase: ZS 2.5 g ( Acute Phase: Placebo)Mean Percent Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 1 Percent Change0.99 percentageStandard Deviation 7.696
Subacute Phase: ZS 2.5 g ( Acute Phase: Placebo)Mean Percent Change From Subacute Baseline in Serum Potassium at All Time Points.Subacute Day 2 Percent Change2.67 percentageStandard Deviation 8.257
Secondary

Percentage of Subjects Who Achieve Normalization in S-K Levels After 48 Hours of Treatment

Time frame: Through 48 hours acute phase

Population: Subjects from ITT population who have completed Acute phase

ArmMeasureValue (NUMBER)
Acute Phase: Placebo TIDPercentage of Subjects Who Achieve Normalization in S-K Levels After 48 Hours of Treatment47.8 percentage of participants
Acute Phase: Sodium Zirconium Cyclosilicate (ZS) 1.25 g TIDPercentage of Subjects Who Achieve Normalization in S-K Levels After 48 Hours of Treatment51.3 percentage of participants
Acute Phase: ZS 2.5 g TIDPercentage of Subjects Who Achieve Normalization in S-K Levels After 48 Hours of Treatment67.9 percentage of participants
Acute Phase: ZS 5 g TIDPercentage of Subjects Who Achieve Normalization in S-K Levels After 48 Hours of Treatment77.6 percentage of participants
Acute Phase: ZS 10 g TIDPercentage of Subjects Who Achieve Normalization in S-K Levels After 48 Hours of Treatment86.4 percentage of participants
Secondary

Percentage of Subjects Within Each Treatment Group Who Retained Normal S-K Values at End of Subacute Phase

Percentage of subjects within each treatment group who retained normal S-K values (values between 3.5-5.0 mmol/L) at end of subacute phase

Time frame: Through 18 days of subacute phase (12 days treatment, 6 days follow-up)

Population: ITT population. One subject (087-025) in the ZS 5 g TID/5 g QD group died on Study Day 4 and was excluded from the ITT Population

ArmMeasureValue (NUMBER)
Acute Phase: Placebo TIDPercentage of Subjects Within Each Treatment Group Who Retained Normal S-K Values at End of Subacute Phase73.2 percentage of participants
Acute Phase: Sodium Zirconium Cyclosilicate (ZS) 1.25 g TIDPercentage of Subjects Within Each Treatment Group Who Retained Normal S-K Values at End of Subacute Phase59.2 percentage of participants
Acute Phase: ZS 2.5 g TIDPercentage of Subjects Within Each Treatment Group Who Retained Normal S-K Values at End of Subacute Phase65.2 percentage of participants
Acute Phase: ZS 5 g TIDPercentage of Subjects Within Each Treatment Group Who Retained Normal S-K Values at End of Subacute Phase64.8 percentage of participants
Acute Phase: ZS 10 g TIDPercentage of Subjects Within Each Treatment Group Who Retained Normal S-K Values at End of Subacute Phase54.4 percentage of participants
Subacute Phase: ZS 5 g QDPercentage of Subjects Within Each Treatment Group Who Retained Normal S-K Values at End of Subacute Phase57.8 percentage of participants
Subacute Phase: Placebo Matched to ZS 10 g QDPercentage of Subjects Within Each Treatment Group Who Retained Normal S-K Values at End of Subacute Phase60.7 percentage of participants
Subacute Phase: ZS 10 g QDPercentage of Subjects Within Each Treatment Group Who Retained Normal S-K Values at End of Subacute Phase61.9 percentage of participants
Subacute Phase: ZS 1.25 (Acute Phase: Placebo)Percentage of Subjects Within Each Treatment Group Who Retained Normal S-K Values at End of Subacute Phase67.4 percentage of participants
Subacute Phase: ZS 2.5 g ( Acute Phase: Placebo)Percentage of Subjects Within Each Treatment Group Who Retained Normal S-K Values at End of Subacute Phase66 percentage of participants
Secondary

Time Subjects Remain Normokalemic (Subacute Phase)

Time (number of days) subjects remain normokalemic (3.5 - 5.0 mmol/l) subacute phase

Time frame: Through 18 days (12 days treatment, 6 days follow-up) of subacute phase

Population: ITT population. One subject (087-025) in the ZS 5 g TID/5 g QD group died on Study Day 4 and was excluded from the ITT Population

ArmMeasureValue (MEAN)Dispersion
Acute Phase: Placebo TIDTime Subjects Remain Normokalemic (Subacute Phase)7.6 DaysStandard Deviation 4.71
Acute Phase: Sodium Zirconium Cyclosilicate (ZS) 1.25 g TIDTime Subjects Remain Normokalemic (Subacute Phase)7.2 DaysStandard Deviation 5.08
Acute Phase: ZS 2.5 g TIDTime Subjects Remain Normokalemic (Subacute Phase)6.2 DaysStandard Deviation 4.78
Acute Phase: ZS 5 g TIDTime Subjects Remain Normokalemic (Subacute Phase)8.6 DaysStandard Deviation 4.55
Acute Phase: ZS 10 g TIDTime Subjects Remain Normokalemic (Subacute Phase)6.0 DaysStandard Deviation 4.43
Subacute Phase: ZS 5 g QDTime Subjects Remain Normokalemic (Subacute Phase)9.0 DaysStandard Deviation 4.22
Subacute Phase: Placebo Matched to ZS 10 g QDTime Subjects Remain Normokalemic (Subacute Phase)8.2 DaysStandard Deviation 4.64
Subacute Phase: ZS 10 g QDTime Subjects Remain Normokalemic (Subacute Phase)10.2 DaysStandard Deviation 3.96
Subacute Phase: ZS 1.25 (Acute Phase: Placebo)Time Subjects Remain Normokalemic (Subacute Phase)8.5 DaysStandard Deviation 4.57
Subacute Phase: ZS 2.5 g ( Acute Phase: Placebo)Time Subjects Remain Normokalemic (Subacute Phase)8.2 DaysStandard Deviation 4.72

Source: ClinicalTrials.gov · Data processed: Mar 10, 2026