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Demographic and perioperative factors associated with initial and prolonged sinus node dysfunction after orthotopic
Insights
Sinus node dysfunction is common after heart transplants. Longer ischemic times correlate with transient, but not persistent, sinus node dysfunction post-transplant.
Area of Science:
- Cardiology
- Transplantation Immunology
- Cardiac Surgery
Background:
- Sinus node (SN) dysfunction is a recognized complication following orthotopic heart transplantation.
- Understanding the etiology of SN dysfunction is crucial for improving patient outcomes.
Purpose of the Study:
- To investigate the causes of sinus node dysfunction after heart transplantation.
- To differentiate between transient and persistent SN dysfunction and their associated factors.
Main Methods:
- Studied 50 heart transplant recipients assessing rhythm origin, heart rate (HR), and corrected sinus node recovery time (CSNRT).
- Evaluated demographic and perioperative factors including donor/recipient age, pretransplant conditions, ischemic time, and surgical techniques.
- Stratified patients based on the duration of SN dysfunction (transient vs. persistent).
Main Results:
- Sinus node dysfunction is frequent post-cardiac transplantation.
- Longer ischemic times were significantly associated with impaired postoperative SN function.
- This association was specifically noted in patients with transient SN dysfunction, not persistent forms.
Conclusions:
- Transient and persistent sinus node dysfunction have distinct etiologies after heart transplantation.
- Ischemic time is a key factor influencing transient SN dysfunction post-transplant.
- No significant association was found between persistent SN dysfunction and the investigated perioperative factors.
Abstract:
The etiology of sinus node (SN) dysfunction after orthotopic heart transplantation as assessed by the origin of rhythm, heart rate (HR), and, provided the origin of rhythm was sinus, by corrected sinus node recovery time (CSNRT) was studied in 50 patients. The possible influences on postoperative donor SN function of donor age, recipient age, underlying pretransplant heart disease, pretransplant amiodarone (AMIO) treatment, date of surgery, ischemic time, surgical technique of atrial incision, the use of different cardioplegic solutions during the study period, and rejection were evaluated. The results thus obtained indicate that SN dysfunction is common after cardiac transplantation and pinpoint to a different etiology of transient (restoration of normal SN function within 4 postoperative weeks) and persistent (SN function still impaired at 3 months) SN dysfunction. Of the several demographic and perioperative variables evaluated, only ischemic time had an influence on postoperative SN function in that ischemic times were significantly longer in patients with impaired SN function when compared with patients exhibiting normal SN function (148 +/- 39 min vs. 110.5 +/- 36 min, respectively, P = 0.001). Further stratification according to the duration of SN dysfunction revealed significantly longer ischemic times in patients with transiently impaired SN function only (156.3 +/- 35 min vs. 110.5 +/- 36 min, P = 0.0026). No relation to persistent SN dysfunction of ischemic time (130.5 +/- 36 min vs. 110.5 +/- 36 min, P = ns) or any other factor investigated was found.