In the present study, arrhythmias were classified
as junctional ectopic tachycardia, frequent (> 10
beats per minute) premature ventricular contraction,
ventricular tachycardia, heart block, and other miscellaneous
arrhythmias including slow junctional
rhythm, and ventricular fibrillation. Supraventricular
tachycardia was defined as narrow complex tachycardia
with one to one atrioventricular conduction and reentry
mechanism. Redo-operation referred to the repeated
operation at the same midline incision.