Smartphone Application for Automated Measurement of Capillary Refill Time (CRT)
Starting soon
Conditions studied: Capillary Refill Time, Peripheral Tissue Perfusion
In brief
This prospective, monocenter observational study aims to validate a smartphone application (CRTApp) that automatically measures capillary refill time (CRT) from a short video of a standardized finger compression. Sixty adult intensive care unit (ICU) patients will undergo a CRT measurement recorded with a professional Android smartphone. Clinical CRT will be determined from the video by three blinded observers (reference = median of the three measurements). The application will analyze the same video locally to provide an automated CRT measurement. Agreement between automated and clinical reference CRT will be assessed, and predefined subgroup analyses will explore performance across skin tone, ambient lighting, smartphone characteristics, and severity of peripheral hypoperfusion.
Key facts
- Study ID
- NCT07473869
- Run by
- Assistance Publique - Hôpitaux de Paris
- People needed
- 60
- Starts
- 2026-06-01
- Expected to finish
- 2027-06-01
- Last updated by the study team
- 2026-03-16
Who can join
Age: 18 and older. Sex: any. Healthy volunteers: not accepted.
You may qualify if…
- Age ≥ 18 years
- Adult patients hospitalized in an intensive care unit
- Clinical indication for capillary refill time assessment (hemodynamic monitoring, suspected peripheral hypoperfusion, or therapeutic evaluation)
- No objection from the patient or legal representative
You may not qualify if…
- Skin lesions at the measurement site
- Known severe peripheral vascular disease
- Finger amputation
- Presence of distinctive skin marks on fingers (tattoos, significant scars, or prominent moles) that may interfere with measurement or increase the risk of patient re-identification
Where it is running
- CHU Bicêtre — Le Kremlin-Bicêtre, France
Full record on ClinicalTrials.gov
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