title: Loss of sinus rhythm after total cavopulmonary connection.
abstract: BACKGROUND
  Total cavopulmonary connection (TCPC) to repair functional single ventricle involves the sinus node area, in contrast to the Fontan procedure. We compared ECG findings after TCPC and Fontan to evaluate the impact of the cavopulmonary connection on sinus rhythm postoperatively.
  
  
  RESULTS
  The Fontan group consisted of 17 patients repaired at 7.8 +/- 3.1 years of age (mean +/- SD): 11 for tricuspid or pulmonary atresia (TA/PA) and 6 for single ventricle. The TCPC group consisted of 19 patients repaired at 5.1 +/- 3.2 years of age (mean +/- SD) (P < .001): 9 for TA/PA, 4 for single ventricle, and 6 for hypoplastic left heart syndrome. Mean follow-up after Fontan was 7.7 +/- 2.7 years versus 2.8 +/- 1.6 years for TCPC (P < .001). Preoperative ECGs on all TCPC patients showed sinus rhythm (SR), whereas 16 of 17 Fontan patients had SR and one had nonsinus atrial rhythm (NSAR) since birth. On the first postdischarge ECG, 12 of 19 TCPC patients (63%) were in SR, 4 were in junctional rhythm (JR), and 3 were in NSAR. In comparison, 15 of 17 Fontan patients (88%) were in SR with 1 of 17 in NSAR and 1 in supraventricular tachycardia (P < .05 with chi 2 test). By 2 years postoperatively, only 6 of 15 TCPC patients available for follow-up (40%) were in SR, with 7 of 15 in JR and 2 of 15 in NSAR. By contrast, 13 of 17 Fontan patients (76%) remained in SR, with 1 in NSAR and 3 in JR (P < .05 with chi 2 test). TCPC patients with loss of SR did not differ from other patients in the group in age at repair, preoperative diagnosis, or surgeon performing the procedure.
  
  
  CONCLUSIONS
  This significant incidence of loss of SR temporally related to surgery suggests that operative compromise of the sinus node area is common with TCPC.
authors.affiliation: Division of Pediatric Cardiology, SUNY-Health Science Center, Syracuse 13210, USA.
authors.forename: R E
authors.initials: RE
authors.lastname: Kavey
authors.forename: W E
authors.initials: WE
authors.lastname: Gaum
authors.forename: C J
authors.initials: CJ
authors.lastname: Byrum
authors.forename: F C
authors.initials: FC
authors.lastname: Smith
authors.forename: D A
authors.initials: DA
authors.lastname: Kveselis
mesh_terms: D002648:Child; D002675:Child, Preschool; D004562:Electrocardiography; D005500:Follow-Up Studies; D018729:Fontan Procedure; D018610:Heart Bypass, Right; D006339:Heart Rate; D006801:Humans; D011184:Postoperative Period; D013997:Time Factors