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Trial on the Impact of Indirect Calorimetry-Guided Nutritional Support on Patient-Centered Outcomes in Critically Ill Patients - The OPTICal Study

A Randomized Controlled Trial on the Impact of Indirect Calorimetry-Guided Nutritional Support on Patient-Centered Outcomes in Critically Ill Patients - The OPTICal Study

Status
Recruiting
Phases
Unknown
Study type
Interventional
Source
ClinicalTrials.gov
Registry ID
NCT07343440
Acronym
OPTICal
Enrollment
356
Registered
2026-01-15
Start date
2026-01-01
Completion date
2027-09-01
Last updated
2026-05-19

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

Conditions

Critical Illness, ICU

Keywords

Nutrition, Indirect calorimetry, Nutrition therapy, Predictive formula

Brief summary

This multicentric randomized controlled trial aims to evaluate whether indirect calorimetry (IC)-guided nutritional support improves patient-centered outcomes in critically ill adult patients compared to standard formula-based nutritional strategies. The study includes mechanically ventilated patients expected to remain in the ICU for more than 72 hours. The intervention group will receive nutritional targets based on measured resting energy expenditure using the QNRG+ device, with a gradual escalation of energy delivery following current ESPEN guidelines. The primary outcome is quality of life at 3 months post-ICU admission, assessed using the EQ-5D-5L. Secondary outcomes include functional recovery, muscle preservation, infection rates, and rehospitalization. This study is the first to assess the long-term impact of IC-guided nutrition on recovery and quality of life using a patient-centered approach.

Interventions

OTHERIndirect Calorimetry Group

* Nutritional targets measured by IC starting on Day 4 * Repeated IC measurements 2 times weekly performed with the QNRG+ device * Gradual escalation to 80%-100% caloric coverage by Day 4

OTHERControl Group - Formula-Based Group

* Nutritional targets determined using predictive equations (pragmatic, set at local level) * Escalation as per local protocol

Sponsors

HEIDEGGER CP
Lead SponsorOTHER
University Hospital, Zürich
CollaboratorOTHER
GHOL Nyon Hospital
CollaboratorUNKNOWN

Study design

Allocation
RANDOMIZED
Intervention model
PARALLEL
Primary purpose
OTHER
Masking
NONE

Eligibility

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

Inclusion criteria

All patients admitted to the ICU with the following criteria: * ≥18 years old * On Mechanical Ventilation * Expected ICU length of stay \>72 hours

Exclusion criteria

* Refusal of the family or patient * Patient transferred from another ICU * Pregnant patient * Patient is planned for a withdrawal of care or is actively dying * Cognitive disorder before ICU * Patient is in jail * Patients already enrolled in the ongoing NutriPhyT trial

Design outcomes

Primary

MeasureTime frameDescription
Quality of life (EQ-5D-5L)At 3 months after ICU admissionMeasured using the EQ-5D-5L: 0-100

Secondary

MeasureTime frameDescription
MortalityUp to 3 months after ICU admission
Nosocomial infectionUp to 28 days after ICU admissionDefined as the initiation of a new antibiotic treatment lasting at least 72 hours, associated with a documented diagnosis of infection in the patient's chart
Pressure soarUp to 28 days after ICU admission
Energy deficit in kcalUp to 28 days after ICU admissionaccording to the energy target defined by IC or predictive formula depending on the randomization group
Protein deficit in gramsUp to 28 days after ICU admissionaccording to the protein target defined by predictive formula
Ventilation-free daysMeasured at day 28 after ICU admission
ICU free-daysMeasured at day 28 after ICU admission
Functional recovery: Bartel IndexAt ICU discharge or up to 28 days after ICU admission and at 3 months after ICU dischargeUsing Barthel Index: 0-100
Gerneral well-being: Edmonton Symptom Assessment ScaleAt ICU discharge or up to 28 days after ICU admission and at 3 months after ICU dischargeUsing Edmonton Symptom Assessment Scale (ESAS) : 0-90
Readmission and rehospitalization ratesUntil 3-month post-ICU admission
Discharge placeUntil 3 months after ICU admission
Return to workUntil 3 months after ICU admission
Disability and functioning: WHO Disability Assessment ScheduleAt 3-month post ICU admissionUsing WHO Disability Assessment Schedule (WHODAS 2.0): 0-48
Disability and functioning: Clinical Frailty ScaleAt 3-month post ICU admissionUsing Clinical Frailty Scale (CFS): 1-9
Disability and functioning: Short-form 12At 3-month post ICU admissionUsing Short-form 12 (SF-12): 0-100
Disability and functioning: MOCA-5At 3-month post ICU admissionUsing montreal cognitive assessment- 5 min (MOCA-5): 0-15
Disability and functioning: Patient Health Questionnaire-9At 3-month post ICU admissionUsing Patient Health Questionnaire-9 (PHQ-9): 0-27

Countries

Switzerland

Contacts

CONTACTClaudia Paula Heidegger, Prof.
claudia.heidegger@hug.ch+41223727440
CONTACTAude de Watteville, MSc
aude.dewatteville@hug.ch+41795533998

Outcome results

None listed

Source: ClinicalTrials.gov · Data processed: May 20, 2026