A comparative study of the incidence of in-hospital cardiopulmonary resuscitation on Monday-Wednesday and Thursday-Sunday: Retrospective analysis in a tertiary care hospital.
Because most medical staff work from Monday-Friday, it is possible that they are relatively more fatigued and less capable of providing emergency supportive services on Thursday-Sunday (Thu-Sun) than on Monday-Wednesday (Mon-Wed). In this study, we aimed to analyze the incidence of in-hospital cardiopulmonary resuscitation (CPR) to determine if it differed between Thu-Sun and Mon-Wed.This retrospective observational study of in-hospital CPR was performed during 2012 to 2016 among inpatients at the Seoul National University Bundang Hospital. The primary outcome was the incidence of in-hospital CPR per 1000 inpatients in the Mon-Wed and Thu-Sun periods. Secondary outcomes included differences in the CPR incidence by time of day and season.In the study, 1195 cases of in-hospital CPR were included. The incidence of in-hospital CPR per 1000 inpatients was significantly higher on Thu-Sun (mean: 0.595, 95% confidence interval [CI]: 0.564-0.626) than on Mon-Wed (mean: 0.505, 95% CI: 0.474-0.536, P < .001). There were no seasonal variations in the incidence of in-hospital CPR. However, in-hospital CPR was most frequently performed between 16:00 and 24:00, and the return of spontaneous circulation (ROSC) rate was the lowest among cases that occurred between 0:00 and 8:00. In addition, the ROSC rate was lowest among female patients, patients with cardiac arrest, and after in-hospital CPR performed on a Sunday.The incidence of in-hospital CPR per 1000 inpatients was significantly higher on Thu-Sun than on Mon-Wed. No seasonal variations were observed in the incidence of in-hospital CPR, but the data suggest circadian variations and differences in ROSC rates.