Zero to Five Automated Oscillometric Office Blood Pressure (AOBP) Measurement

Zero to Five Automated Oscillometric Office Blood Pressure (AOBP) Measurement: the Impact of a 5 Minute Rest Time on AOBP Measurement

Status

Completed

Phases

Study type

Interventional

Source

ClinicalTrials.gov

Registry ID

NCT03732924

Enrollment

618

Registered

2018-11-07

Start date

2018-11-15

Completion date

2020-07-15

Last updated

2020-09-09

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

Conditions

Cardiovascular Diseases, Hypertension

Brief summary

The Hypertension Canada Clinical Practice Guidelines for blood pressure measurement using AOBP recommend against any wait time prior to commencing the measurement. The recent AHA guidelines however call for a 5-minute rest first. In uncontrolled hypertension, AOBP is typically higher than the daytime readings from ambulatory blood pressure monitoring (ABPM), but this is not the case for patients with controlled hypertension.

Detailed description

Objective: Does a 5 minute rest or no rest before measurement using AOBP provide the most accurate reading in patients with controlled and uncontrolled hypertension, and in patients with white coat hypertension compared to daytime ABPM? Implications: Through this study, we hope to: (i) Advance the understanding of the role of AOBP in measuring blood pressure. (ii) Determine whether a 5-minute rest, or no rest at all is needed prior to AOBP measurement. (iii) Assess the relationship of AOBP to daytime ABPM for patient with controlled and uncontrolled hypertension and in patients with white coat hypertension.

Interventions

DIAGNOSTIC_TESTZero to Five Automated Oscillometric Office Blood Pressure (AOBP) Measurement

To compare the difference between the daytime ABPM and AOBP with zero or five minutes wait time.

Study design

Allocation

RANDOMIZED

Intervention model

PARALLEL

Primary purpose

DIAGNOSTIC

Masking

SINGLE (Subject)

Eligibility

Sex/Gender

ALL

Age

18 Years to No maximum

Healthy volunteers

Inclusion criteria

* Age 18 years or older * Referred for ABPM * Written informed consent

Exclusion criteria

* Unable to perform AOBP or ABPM for some reason

Design outcomes

Primary

Measure	Time frame	Description
Difference in systolic and diastolic BP in patients randomized to zero or five minutes wait before the AOBP measurement.	4 months - 1 yr	difference in blood pressure

Secondary

Measure	Time frame	Description
Difference in systolic and diastolic BP between the AOBP and daytime ABPM in patients randomized to zero or five minutes wait before the AOBP measurement.	4 months - 1yr	difference in blood pressure

Countries

Canada

Outcome results

None listed

Source: ClinicalTrials.gov · Data processed: Feb 15, 2026