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Frequency and significance of conduction defects early after orthotopic heart transplantation
F M Leonelli1, A Pacifico, J B Young
1Department of Internal Medicine, University of Kentucky, Lexington 40536.
Insights
Conduction defects after heart transplantation are common and linked to longer donor ischemic times and increased cardiac rejection. Persistent abnormalities indicate a higher risk of complications.
Area of Science:
- Cardiology
- Transplantation Medicine
- Electrophysiology
Background:
- Post-orthotopic heart transplantation, electrocardiogram (ECG) abnormalities, particularly conduction defects, are frequently observed.
- Understanding the clinical significance of these ECG changes is crucial for patient management and outcomes.
Purpose of the Study:
- To investigate the clinical significance and evolution of conduction defects detected by electrocardiograms (ECGs) in patients following orthotopic heart transplantation.
- To identify factors associated with the development and persistence of these postoperative conduction abnormalities.
Main Methods:
- Sequential ECGs from 124 patients undergoing orthotopic heart transplantation were analyzed during their postoperative hospital stay.
- Patients were categorized into groups based on the evolution of their initial ECG findings: normal, transient defects, permanent defects, and progressive deterioration.
- Statistical analysis was performed to correlate ECG evolution with donor ischemic time and in-hospital cardiac rejection severity.
Main Results:
- The initial ECG was abnormal in 73% of patients, predominantly showing right bundle branch block.
- Persistent conduction abnormalities were significantly associated with longer donor heart ischemic times (182 minutes) compared to normal (144 minutes) or transient (130 minutes) defects.
- Groups with persistent or progressive conduction defects experienced a higher incidence of multiple cardiac rejection episodes (46.1-66.6%) compared to those with normal or transient defects (0-16.6%).
Conclusions:
- The evolution of ECG conduction defects after heart transplantation is influenced by donor ischemic time and the severity of cardiac rejection.
- Persistent conduction abnormalities post-transplantation may serve as an indicator of increased risk related to prolonged ischemia and rejection.
- Further monitoring and management strategies may be warranted for heart transplant recipients exhibiting persistent conduction defects.
Abstract:
To define the clinical significance of conduction defects after orthotopic heart transplantation sequential electrocardiograms (ECG) of 124 patients were analyzed during their postoperative hospital stay. The first ECG was abnormal in 90 patients (73%), with a predominance of right bundle branch block, and normal in 34 (27%). Sex, age, mean donor ischemic time, duration of aortic cross clamping and use of previous antiarrhythmic therapy were not significantly different in the 2 groups. During hospital follow-up, patients were grouped according to evolution of the initial electrocardiographic abnormalities. In group 1, 25 patients continued to have an initially normal ECG. In groups 2 and 3, 30 and 48 patients, respectively, had evidence of transient and permanent conduction defects. The 21 patients in group 4 showed progressive deterioration of conduction with either a new (9 patients) or worsening preexisting conduction defect (12 patients). The evolution of the initial ECG was strongly dependent on the duration of the donor heart ischemic time and the severity of the in-hospital cardiac rejection. Patients with persistent conduction abnormalities had a statistically longer ischemic time than either patients with normal or transient conduction defects (182 +/- 84 vs 144 +/- 68 and 130 +/- 66 minutes, p = 0.04). Although the overall percentage of patients with histologic evidence of moderate to severe rejection was similar across the groups, 66.6 and 46.1% of patients in groups 3 and 4, respectively, had multiple episodes of rejection compared with 16.6 and 0% in the remaining 2 groups (p = 0.044).(ABSTRACT TRUNCATED AT 250 WORDS)