Indirect calorimetry-guided nutrition in critically ill adults
Official title: A Randomized Controlled Trial on the Impact of Indirect Calorimetry-Guided Nutritional Support on Patient-Centered Outcomes in Critically Ill Patients - The OPTICal Study
Run by University Hospital, Geneva · NCT07343440 · Data updated 2026-11-12
This study tests whether using indirect calorimetry to guide how much energy ICU patients receive improves quality of life three months after ICU stay.
Quick facts
| Study type | Interventional |
|---|---|
| Ages | 18 Years and up |
| Sex | All |
| Enrollment | 356 (estimated) |
| Sponsor | University Hospital, Geneva Academic / other |
| Locations | 3 sites (Geneva and 2 other locations) |
| Status | Recruiting |
| Started | January 1, 2026 |
| Main results expected | June 1, 2027 |
| Study ends | September 1, 2027 |
| Registry record updated | May 19, 2026 |
| Trial ID | NCT07343440 on ClinicalTrials.gov |
Is this trial a fit for you?
✓Likely a good fit
Adults (18+) in the ICU who require mechanical ventilation for an anticipated stay longer than 72 hours and consent is obtainable.
✕Probably not a fit
Patients who are not expected to survive the ICU stay or have contraindications to trial procedures may not benefit.
A plain-English reading of the study's rules. Only the study team can confirm whether you qualify.
What this trial studies
This multicenter randomized trial enrolls mechanically ventilated adults with an expected ICU stay over 72 hours to compare indirect calorimetry-guided nutrition against standard formula-based feeding. The intervention uses measured resting energy expenditure to set energy targets and gradually increases delivery per ESPEN guidelines. Primary outcome is quality of life at 3 months post-ICU, measured with EQ-5D-5L, with secondary goals including functional recovery, muscle preservation, infection rates, and rehospitalization. This approach aims to determine if personalized energy targets during critical illness lead to better long-term patient-centered outcomes. The study is led by HEIDEGGER CP with collaborators at Geneva University Hospital, GHOL Nyon, and Zürich University Hospitals.
Why it matters
Potential benefit: If successful, patients could experience better long-term quality of life and recovery after critical illness.
How similar studies have gone: Prior research suggests nutrition personalization may improve outcomes, but long-term patient-centered impact via indirect calorimetry is still being explored.
Who can join: the full rules
Show full inclusion / exclusion criteria
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
Where it's running
-
Geneva University Hospital
Geneva, Switzerland Recruiting -
Ghol
Nyon, Switzerland Recruiting -
Zürich University Hospitals
Zurich, Switzerland Recruiting
Study contacts
- Study coordinator: Claudia Paula Heidegger, Prof.
- Email: claudia.heidegger@hug.ch
- Phone: +41223727440
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How to take part
- Review the eligibility criteria above with your treating physician.
- Check the official listing on ClinicalTrials.gov for the latest contact details and recruitment status.
- Contact the study coordinator or principal investigator to ask for pre-screening. Pre-screening is free and never obligates you to enroll.