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Normal AV node function in patients with sinus node dysfunction after cardiac transplantation

G Heinz1, C Kratochwill, M Hirschl

  • 1Abteilung für Kardiologie, II Chirurgische Universitätsklinik, Wien, Austria.

Journal of Cardiac Surgery
|May 1, 1993
PubMed
Summary
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Cardiac transplant recipients generally maintain normal atrioventricular nodal (AVN) function, even with impaired sinus node (SN) function. AVN conduction remains stable post-transplant, with few requiring pacemakers for AVN issues.

Area of Science:

  • Cardiology
  • Electrophysiology
  • Transplantation Medicine

Background:

  • Cardiac transplantation can affect cardiac conduction systems.
  • Sinus node (SN) recovery is variable after transplantation.
  • Atrioventricular nodal (AVN) function requires evaluation in this population.

Purpose of the Study:

  • To compare postoperative atrioventricular nodal (AVN) function in cardiac transplant recipients with normal versus impaired sinus node (SN) function.
  • To assess the stability of AVN conduction over time after cardiac transplantation.

Main Methods:

  • Compared AVN function in 55 patients with normal SN function and 50 with impaired SN function.
  • Utilized fixed atrial pacing at various cycle lengths (600-300 msec).
  • Determined relative and effective AVN refractory periods and Wenckebach cycle lengths.

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Main Results:

  • Only one patient experienced high-degree AVN conduction disturbance (Wenckebach phenomenon < 630 msec).
  • No significant differences in resting PQ interval, Wenckebach cycle length, AVNRRP, or AVNERP between normal and impaired SN groups.
  • AVN conduction remained stable during follow-up (mean 318 days).

Conclusions:

  • Postoperative AVN function is generally preserved in cardiac transplant recipients, irrespective of sinus node function.
  • Significant AVN conduction disturbances are uncommon after cardiac transplantation.
  • Sinus node deficiency, not AVN dysfunction, is the primary indication for pacemaker implantation in this cohort.