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  • Title: Association of Sublingual Microcirculation Parameters and Capillary Refill Time in the Early Phase of ICU Admission.
    Author: Huang W, Xiang H, Hu C, Wu T, Zhang D, Ma S, Hu B, Li J.
    Journal: Crit Care Med; 2023 Jul 01; 51(7):913-923. PubMed ID: 36942969.
    Abstract:
    OBJECTIVES: This observational study was conducted to investigate capillary refill time (CRT) during the early phase of ICU admission in relationship with microvascular flow alteration and outcome in critically ill patients. DESIGN: Prospective, observational, pilot study. SETTING: ICU in a university hospital. PATIENTS: Two hundred eighty-two critically ill adult patients admitted to the ICU. INTERVENTIONS: None. MEASUREMENTS AND MAIN RESULTS: All patients underwent simultaneous measurements by CRT and sidestream dark field imaging within 24 hours of ICU admission. Other clinical data such as demographic characteristics, hemodynamics, laboratory values, treatment, and physiologic parameters were also included simultaneously. Microcirculatory measurements were performed at 10.2 ± 5.7 hours after ICU admission. Of the 282 included patients, 106 (37.6%) were female, the median (interquartile range) age was 63 years (53-74 yr), and the median Sequential Organ Failure Assessment (SOFA) score was 5 (2-7). The primary finding was the association between CRT and simultaneous the condition of peripheral circulation (microvascular flow index [MFI]: r = -0.4430, p < 0.001; proportion of perfused vessels: r = -0.3708, p < 0.001; heterogeneity index: r = 0.4378, p < 0.001; perfused vessel density: r = -0.1835, p = 0.0020; except total vessel density: p = 0.9641; and De Backer score: p = 0.5202) in critically ill patients. In addition, this relationship was also maintained in subgroups. Microcirculatory flow abnormalities, 28-day mortality, and SOFA score appeared to be more severe for increasing CRT. In a multivariable analysis, prolonged CRT was independently associated with microvascular flow abnormalities (MFI < 2.6; odds ratio [OR], 1.608; 95% CI, 2.1-10.2; p < 0.001). Similarly, multivariable analysis identified CRT as an independent predictor of 28-day mortality (OR, 1.296; 95% CI, 1.078-1.558; p = 0.006). CONCLUSIONS: In our ICU population, a single-spot prolonged CRT was independently associated with abnormal microcirculation and increased mortality.
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