Participants and setting
arrest, atrial septal defect
CIRCULATORY ARREST, ARREST
Patients aged ≤18 years undergoing congenital heart surgery requiring CPB and cardioplegic arrest at the Bristol Royal Hospital for Children, a regional congenital cardiac surgery centre in the UK, were screened for eligibility. Patients weighing <3 kg, those requiring emergency surgery or secundum atrial septal defect repair as an isolated procedure were excluded. Also excluded were patients judged preoperatively by the surgeon to require deep hypothermic circulatory arrest, or deep hypothermic CPB or considered too complex [