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Electrical instability in patients undergoing surgery for atrioventricular septal defect
L Daliento1, G Rizzoli, M C Marchiori
1Department of Cardiology, University of Padua, Italy.
International Journal of Cardiology
|January 1, 1991
Summary
Postoperative arrhythmias after atrioventricular septal defect repair are common, particularly ventricular ones. Electrical instability is linked to patient size, right ventricle dilation, and conduction blocks, but improved by better left ventricle function.
Area of Science:
- Cardiology
- Pediatric Cardiac Surgery
- Electrophysiology
Background:
- Atrioventricular septal defects (ASDs) are congenital heart conditions requiring surgical intervention.
- Postoperative arrhythmias are a known complication following ASD repair.
- Understanding risk factors for arrhythmias is crucial for patient management.
Purpose of the Study:
- To determine the incidence of atrial and ventricular arrhythmias after surgical repair of atrioventricular septal defects.
- To identify factors associated with cardiac electrical instability in the postoperative period.
Main Methods:
- 24-hour Holter monitoring in 106 patients post-AVSD repair.
- Classification of arrhythmias using Lown criteria.
- Logistic regression analysis to correlate arrhythmias with clinical and surgical variables.
Main Results:
- Ventricular arrhythmias (33%) were more frequent than atrial arrhythmias (10%) post-surgery.
- Electrical instability correlated with larger body size, increased right ventricular end-diastolic diameter, larger VSD size, and conduction blocks (RBBB, LAHB).
- Improved left ventricular shortening fraction and more recent surgery were associated with reduced arrhythmia risk.
Conclusions:
- Postoperative arrhythmias are common after AVSD repair, with ventricular arrhythmias predominating.
- Specific patient and surgical factors significantly influence the risk of cardiac electrical instability.
- Risk stratification and monitoring are essential for managing these patients.