Comparison of anatomic isthmus block with the modified right atrial maze procedure for late atrial tachycardia in Fontan patients

Barbara J. Deal, Constantine Mavroudis, Carl L. Backer, Scott H. Buck, Christopher Johnsrude

Research output: Contribution to journalArticle

Abstract

Background - Late atrial reentry tachycardia (AT) after Fontan repair is common, with limited efficacy of medical therapy in preventing AT recurrence. In this study, two approaches to surgical arrhythmia ablation in patients with refractory AT undergoing Fontan revision are compared: cryoablation of the inferomedial right atrium (RA), and a more extensive modified RA maze procedure designed to eliminate all potential RA reentrant circuits. Methods and Results - Fontan revision was performed in 23 patients with AT, using inferomedial RA cryoablation (Group 1, n=8) and modified RA maze procedure (Group 2, n=15). There was no difference in age at initial Fontan, age at Fontan revision, age at onset of AT, or number of failed antiarrhythmic medications. Patients underwent preoperative, intraoperative, and postoperative electrophysiological studies. Thirty-eight different tachycardia circuits were induced in preoperative studies with 3 major areas of RA involvement: the lower lateral RA, the atrial septum, and the inferomedial RA. At postoperative electrophysiological study, AT was inducible in 62% of Group 1 patients but only 7% of Group 2 patients (P<0.02). With mean follow-up of 43 months, 5 of 8 patients in Group 1 experienced AT recurrence compared with none in Group 2 (P<0.001). There was no significant difference in length of hospital stay or complication rate comparing the two groups. Conclusion - Modified RA maze procedure is superior to anatomic isthmus block in treating reentrant AT in postoperative Fontan patients. The modified RA maze has eliminated AT recurrence at mid-term follow-up with low morbidity and mortality.

Original languageEnglish (US)
Pages (from-to)575-579
Number of pages5
JournalCirculation
Volume106
Issue number5
DOIs
StatePublished - Jul 30 2002
Externally publishedYes

Keywords

  • Arrhythmia surgery
  • Atrial tachycardia
  • Fontan operation

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine
  • Physiology (medical)

Fingerprint Dive into the research topics of 'Comparison of anatomic isthmus block with the modified right atrial maze procedure for late atrial tachycardia in Fontan patients'. Together they form a unique fingerprint.

  • Cite this