A Signal Processing Method for Target Phase Stimulation in Neural Regulation

Abstract

We aimed to evaluate factors associated with time to return to OR in children presenting with post-tonsillectomy hemorrhage to a tertiary children's hospital.Retrospective study of pediatric patients presenting to a single institution from January 2012 to January 2020, with post-tonsillectomy hemorrhage (PTH) requiring surgical intervention for control of bleeding. Correlation, univariate, and multivariate analysis were conducted.Of 15,984 tonsillectomies performed at our institution during the study period, 144 required return to the OR for bleeding control, in addition to 15 other children whose tonsillectomy had been performed at an outside institution. Mean time to the OR was 119.7 min (SD 101.5) in the morning, 77.4 min (SD 60.6) in the afternoon, 55.6 min (SD 34.8) in the evening, and 49.4 min (SD 26.4) overnight (ANOVA p < 0.0001). The mean hemoglobin decline from pre-to post-tonsillectomy was 1.3 g/dl (SD 1.7). Primary hemorrhages had a mean time to OR of 62.39 min (SD 63.42) while secondary hemorrhages mean time to OR was 85.54 min (SD 76.21) (p = 0.0064). There was no significant difference in time to OR among race/ethnicity (p = 0.928), insurance status (p = 0.359), weekday (p = 0.557), surgeon seniority (p = 0.8104) or by hemoglobin drop (p = 0.2773). When controlling for each of these variables, multiple linear regression showed that only time of day had significant correlation with time to OR (p = 0.0003).At a tertiary children's hospital, patients presenting with PTH requiring revision surgery waited the longest to get to the OR in the morning versus all other times of day.These results can aid in individualization of anticipatory guidance in order to reduce morbidity and mortality from complications requiring revision in the operating room.