TABLE 1.

Patient information

Patient	Age at implant	Cardiac diagnoses	Cardiac surgical history	Prior cardiac procedures	Indication for pacing	Rhythm at implant time
1	5 years	TGA intact septum, SubPS	BT; Mustard, SubPS resection, MV repair; Redo mustard; LAV valve replacement	4	APB	Complete heart block, paroxysmal atrial fibrillation
2*	14 months	Shone’s anomaly: CoA, MS, subaortic stenosis bicuspid aortic valve	CoA repair; Redo CoA repair; Resection supravalvular mitral ring; MV replacement	4	APB	Complete heart block, accelerated idioventricular rhythm
3	9 months	ToF	ToF repair	1	APB†	Sinus rhythm/accelerated junctional rhythm
4	10 years	PA, intact septum	BT; BDG; Fontan	3	SND†	Junctional bradycardia
5*	3 years	Hypoplastic left heart	Norwood, BT revision; BDG; Fontan	3	SND†	Atrial flutter
6	2 months	VSD	VSD repair	1	APB	Complete heart block with junctional escape
7	10 years	TA, VSD, subaortic stenosis	PA banding; BDG; Fontan	2	SND†	Sinus bradycardia with premature atrial beats
8*	23 years	TA, PS	RBT; LBT; Fontan; PA arterioplasty, Redo BT	4	SND, IART†	Sinus bradycardia
9*	5 years	Unbalanced AVSD, TGA, PA, AV valve incompetence	BT shunt; BDG; Fontan	3	APB†	Junctional bradycardia
10*	5 years	DILV	BDG; Fontan	3	SND†	Junctional bradycardia
11	4 years	ToF	ToF repair	1	Long QT†	Sinus rhythm, intermittent torsade de pointes

^*Follow-up duration below mean

^†Pacemaker implantation was primary operation of admission. APB Acquired postoperative heart block; AV Atrioventricular; AVSD Atrioventricular septal defect; BDG Bidirectional Glenn; BT Blalock-Taussig shunt; CoA Coarctation of the aorta; DILV Double inlet left ventricle; IART Intra-atrial re-entrant tachycardia; L Left; LAV Left atrioventricular; MS Mitral stenosis; MV Mitral valve; PA Pulmonary atresia; PS Pulmonary stenosis; R Right; SND Sinus node dysfunction; SubPS Subpulmonary stenosis; TA Tricuspid atresia; TGA Transposition of great arteries; ToF Tetralogy of Fallot; VSD Ventricular septal defect