Sinus node dysfunction after orthotopic cardiac transplantation: postoperative incidence and long-term implications

Area of Science:

• Cardiology
• Transplant Surgery
• Electrophysiology

Background:

• Sinus node (SN) dysfunction is a potential complication following cardiac transplantation.
• Understanding its incidence, recovery rates, and clinical impact is crucial for patient management.

Purpose of the Study:

• To investigate the incidence, normalization rates, and clinical significance of sinus node dysfunction in the postoperative period after cardiac transplantation.
• To identify predictors of SN function recovery and the need for long-term pacing.

Main Methods:

• Systematic evaluation of 90 cardiac transplant recipients.
• Assessment of sinus node function, heart rhythm, and need for pacing in the postoperative period and during follow-up.
• Statistical analysis to identify predictors of normalization and clinical outcomes.

Main Results:

• 39 of 90 patients (43%) exhibited impaired SN function post-transplant.
• 22 patients normalized SN function, while 17 remained impaired at 3 months.
• Patients with prolonged SN recovery time and those reverting to sinus rhythm showed higher normalization rates.
• A postoperative heart rate <70 bpm was related to outcome but lacked predictive accuracy.
• Patients with postoperative escape rhythm were most likely to benefit from long-term pacing.

Conclusions:

• Sinus node dysfunction is frequent after cardiac transplantation, with suboptimal recovery rates.
• Predicting normalization and the need for long-term pacing remains challenging.
• Postoperative escape rhythm is a key indicator for potential long-term pacemaker therapy, even in patients with apparent sinus rhythm recovery.