Capillary Refill Time Variation to Predict Oxygen Comsumption Variation After FLuid Challenge (CARTOFL) (CARTOFL)

October 29, 2026 updated by: Hospices Civils de Lyon

Circulatory shock is characterized by tissue hypoxia. Although fluid resuscitation is an essential treatment in many forms of circulatory shock, its benefits are variable, and its administration carries a risk of potentially harmful fluid overload.

Assessment of fluid responsiveness generally relies on changes in cardiac output. However, the actual therapeutic objective is rather to improve tissue oxygen utilization, as reflected by oxygen consumption. Despite its physiological relevance, direct measurement of oxygen consumption remains complex and difficult to perform in routine clinical practice.

Capillary refill time is a simple, rapid, non-invasive, and readily available marker of peripheral perfusion. It is associated with outcomes in patients with circulatory shock, and a capillary refill time-guided therapeutic strategy may improve outcomes in patients with septic shock.

This study hypothesizes that changes in capillary refill time following fluid resuscitation may predict changes in oxygen consumption induced by fluid administration. If confirmed, capillary refill time and its changes could be incorporated into the criteria used to assess the indication for fluid resuscitation in patients with shock. They would also provide additional physiological information regarding the relationship between peripheral perfusion and oxygen consumption.

Study Overview

Status

Status

Indicates the current recruitment status or the expanded access status.
Not yet recruiting

Conditions

Conditions

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Intervention / Treatment

Intervention / Treatment

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Study Type

Study Type

Describes the nature of a clinical study. Study types include interventional studies (also called clinical trials), observational studies (including patient registries), and expanded access.
Observational

Enrollment (Estimated)

Enrollment

The number of participants in a clinical study. The "anticipated" enrollment is the target number of participants that the researchers need for the study.
80

Contacts and Locations

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Study Contact

Study Contact

The name and contact information for the person who can answer enrollment questions for a clinical study. Each location where the study is being conducted may also have a specific contact, who may be better able to answer those questions.

Study Locations

  • France
      • Bron, France, 69500
        • Service d'Anesthésie-Réanimation, Hôpital Louis Pradel, Hospices Civils de Lyon
        • Contact:
        • Principal Investigator:
          • Rémi Schweizer, Dr

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Eligibility Criteria

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Ages Eligible for Study

18 years and older (Adult, Older Adult)

Accepts Healthy Volunteers

No

Genders Eligible for Study

All

Sampling Method

Non-Probability Sample

Study Population

Patients admitted to the ICU

Description

Inclusion Criteria :

  • Adult patient admitted to the intensive care unit within the previous 72 hours
  • Receiving invasive mechanical ventilation
  • For whom the clinician plans to perform a fluid challenge
  • No objection from the participant or a relative/legally authorized representative

Exclusion Criteria :

  • Fraction of inspired oxygen greater than 60%
  • Administration of inhaled medications, including nitric oxide
  • Positive end-expiratory pressure greater than 15 cmH₂O
  • Excessive leaks in the ventilator circuit, defined as an expired volume less than 95% of the inspired volume
  • Patient receiving mechanical circulatory support involving a gas exchanger
  • Patient receiving renal replacement therapy
  • Administration of sodium bicarbonate within the 2 hours preceding inclusion
  • Disconnection from the ventilator anticipated before the end of the study

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Observational Models: COHORT
  • Time Perspectives: PROSPECTIVE

Cohorts and Interventions

Group / Cohort

Group / Cohort

A group or subgroup of participants in an observational study that is assessed for biomedical or health outcomes.
Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.
Patients

The patients targeted by this study are mechanically ventilated intensive care patients for whom the attending clinician plans to perform a fluid challenge.
Device: Indirect calorimetry measurement

Setup of an indirect calorimetry measurement

What is the study measuring?

Primary Outcome Measures

Primary Outcome Measures

In a clinical study's protocol, the planned outcome measure that is the most important for evaluating the effect of an intervention/treatment. Most clinical studies have one primary outcome measure, but some have more than one.
Outcome Measure
Measure Description
Time Frame
Assessment of the ability of fluid challenge-induced changes in capillary refill time to predict fluid challenge-induced changes in oxygen consumption
Time Frame: Day 0

Area under the receiver operating characteristic curve of changes in capillary refill time for predicting a 15% increase in oxygen consumption during a fluid challenge
Day 0

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Sponsor

The organization or person who initiates the study and who has authority and control over the study.
Hospices Civils de Lyon

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Estimated)

Study Start

The actual date on which the first participant was enrolled in a clinical study. The "anticipated" study start date is the date that the researchers think will be the study start date.
December 1, 2026

Primary Completion (Estimated)

Primary Completion

The date on which the last participant in a clinical study was examined or received an intervention to collect final data for the primary outcome measure. Whether the clinical study ended according to the protocol or was terminated does not affect this date. For clinical studies with more than one primary outcome measure with different completion dates, this term refers to the date on which data collection is completed for all the primary outcome measures. The "anticipated" primary completion date is the date that the researchers think will be the primary completion date for the study.
December 1, 2027

Study Completion (Estimated)

Study Completion

The date on which the last participant in a clinical study was examined or received an intervention/treatment to collect final data for the primary outcome measures, secondary outcome measures, and adverse events (that is, the last participant's last visit). The "anticipated" study completion date is the date that the researchers think will be the study completion date.
December 1, 2027

Study Registration Dates

First Submitted

First Submitted

The date on which the study sponsor or investigator first submitted a study record to ClinicalTrials.gov. There is typically a delay of a few days between the first submitted date and the record's availability on ClinicalTrials.gov (the first posted date).
September 15, 2026

First Submitted That Met QC Criteria

First Submitted That Met QC Criteria

The date on which the study sponsor or investigator first submits a study record that is consistent with National Library of Medicine (NLM) quality control (QC) review criteria. The sponsor or investigator may need to revise and submit a study record one or more times before NLM's QC review criteria are met. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
September 22, 2026

First Posted (Actual)

First Posted

The date on which the study record was first available on ClinicalTrials.gov after National Library of Medicine (NLM) quality control (QC) review has concluded. There is typically a delay of a few days between the date the study sponsor or investigator submitted the study record and the first posted date.
September 24, 2026

Study Record Updates

Last Update Posted (Actual)

Last Update Posted

The most recent date on which changes to a study record were made available on ClinicalTrials.gov. There may be a delay between when the changes were submitted to ClinicalTrials.gov by the study's sponsor or investigator (the last update submitted date) and the last update posted date.
November 2, 2026

Last Update Submitted That Met QC Criteria

Last Update Submitted That Met QC Criteria

The most recent date on which the study sponsor or investigator submitted changes to a study record that are consistent with National Library of Medicine (NLM) quality control (QC) review criteria. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
October 29, 2026

Last Verified

Last Verified

The most recent date on which the study sponsor or investigator confirmed the information about a clinical study on ClinicalTrials.gov as accurate and current. If a study with a recruitment status of recruiting; not yet recruiting; or active, not recruiting has not been confirmed within the past 2 years, the study's recruitment status is shown as unknown.
September 1, 2026

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

Other Study ID Numbers

Identifiers or ID numbers other than the NCT number that are assigned to a clinical study by the study's sponsor, funders, or others. These numbers may include unique identifiers from other trial registries and National Institutes of Health grant numbers.
  • 69HCL26_0902

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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