Improvement in the precision of capillary refill time measurements for diagnosing hypovolemic status

The capillary refill time (CRT) is the that elapses before fingernail color returns to red from white after releasing a load applied nail. We aimed estimate hypovolemic status using CRT. However, precision of CRT low. first step toward improving was estimation coefficient variance (CV) via repeated measurements. best and next-best indices change rates in state were 0.19 0.48 respectively, corresponding target CVs ≤ 0.10 0.24. CRTs subjects measured by imaging nails during loading unloading fitting an exponential function curve intensity changes. 0.77 ± 0.35 s (n = 108), which comparable previous studies. CV 0.37 0.13, higher than even second-best index. Thus, we used only green channels nail images generate algorithms define optimal start calculations; this provided lower (0.31 0.12). Finally, investigated effects fingertip temperature release timing on cardiac cycle. Correction effect with care phase cycle trigger data collection reduced 0.15 0.11, cleared our protocol improves precision; it may be possible