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Optimal cardiac pacing after heart transplantation
I C Melton1, D M Gilligan, M A Wood
1Department of Cardiovascular Electrophysiology, Virginia Commonwealth University/Medical College of Virginia Hospital, and the McGuire VA Medical Center, Richmond 23298-0053, USA.
Pacing and Clinical Electrophysiology : PACE
|December 10, 1999
Summary
Heart transplant recipients often develop bradycardia (slow heart rate) and chronotropic incompetence. Pacing, particularly in DDDR mode, can improve exercise capacity and cardiac output in these patients.
Area of Science:
- Cardiology
- Transplantation Medicine
- Biomedical Engineering
Background:
- Heart transplantation leads to autonomic denervation, causing bradycardia and chronotropic incompetence.
- Diastolic dysfunction and allograft rejection are common post-transplant complications.
- Long-term pacing needs for bradycardia post-transplantation are difficult to predict.
Purpose of the Study:
- To evaluate the impact of pacing on exercise capacity and cardiac function in heart transplant recipients.
- To determine the optimal pacing mode for patients requiring permanent pacemakers after cardiac transplantation.
Main Methods:
- Observational analysis of heart transplant patients with sinus node dysfunction and bradycardia.
- Assessment of exercise capacity and cardiac output in relation to pacing modes (DDDR, AAIR).
- Evaluation of theophylline treatment efficacy for early postoperative bradycardia.
Main Results:
- Bradycardia requiring permanent pacing affects 30%-50% of long-term heart transplant recipients.
- Pacing that restores chronotropic competence significantly improves exercise capacity.
- Preservation of atrioventricular (AV) synchrony through pacing enhances cardiac output.
Conclusions:
- Permanent pacemaker implantation is indicated for persistent bradycardia beyond two weeks post-transplant, even with theophylline treatment.
- DDDR mode pacing is recommended to maximize benefits, especially for pacemaker-dependent patients.
- Optimizing heart rate response and AV synchrony via pacing is crucial for improving outcomes in heart transplant recipients.