Wolfe HA, Morgan RW, Sutton RM, et al. - Given that diastolic blood pressure (DBP) as a measure of chest compression quality was correlated with survival from pediatric in-hospital cardiac arrest (IHCA), researchers tested the assumption that DBP during CPR for IHCA is lower during nighttime, defined as 11:00 p.m. to 6:59 a.m. compared with daytime, defined as 7:00 a.m. until 10:59 p.m. It was a secondary analysis of data obtained from the Pediatric Intensive Care Quality of Cardiopulmonary Resuscitation Study. Participants in the study were pediatric or Pediatric Cardiac Intensive Care Unit patients who received chest compressions for ≥ 1 min and who had invasive arterial BP monitoring. One hundred sixty-four arrests [45 (27%) occurred at nighttime and 119 (73%) during daytime] met all inclusion/exclusion criteria between July 1, 2013, and June 30, 2016. No significant difference was found in DBP during CPR between nighttime and daytime in this cohort of pediatric ICU patients with IHCA.