Smartphone Application for Automated Measurement of Capillary Refill Time (CRT)

Condition(s) studied

Study summary

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.

Eligibility

Primary outcome measure(s)

• Agreement Between Automated and Clinical Capillary Refill Time Measurement — At inclusion (single assessment)
  Agreement between capillary refill time measured by the smartphone application and the clinical reference measurement performed by expert clinicians using the standardized method (10-second glass slide compression). Agreement is assessed using the intraclass correlation coefficient between the automated measurement and the median of three blinded observers.

Trial sites (1)

More Assistance Publique - Hôpitaux de Paris trials in France