Dysrhythmias after atrial surgery in children

Area of Science:

• Cardiology
• Cardiac Surgery
• Pediatric Cardiology

Background:

• Postoperative dysrhythmias are a significant concern following cardiac surgeries.
• Atrial surgeries, including Mustard's operation and atrial septal defect (ASD) closure, carry risks of arrhythmias.

Purpose of the Study:

• To compare the incidence of postoperative dysrhythmias after Mustard's operation versus ASD closure.
• To identify surgical factors associated with dysrhythmias in both procedures.
• To investigate the relationship between dysrhythmias and late mortality.

Main Methods:

• Retrospective analysis of 50 patients post-Mustard's operation (Group A) and 204 patients post-ASD closure (Group B).
• Evaluation of postoperative dysrhythmias, including atrial fibrillation (AF) and atrioventricular junctional (AVJ) rhythms.
• Correlation analysis between dysrhythmias and surgical variables (age, cardioplegia, perfusion time, cannulation, defect location, pulmonary venous drainage).

Main Results:

• Higher incidence of dysrhythmias in Group A (42%) compared to Group B (23%).
• Significant late mortality (16%) in Group A, linked to AF and AVJ.
• In Group A, dysrhythmias correlated with age, cardioplegia, perfusion time, and cannulation type.
• In Group B, dysrhythmias related to defect location and abnormal pulmonary venous drainage.
• Lower dysrhythmia rates observed after ASD closure using hypothermia versus cardiopulmonary bypass.

Conclusions:

• Mustard's operation is associated with a higher incidence of postoperative dysrhythmias and late mortality compared to ASD closure.
• Surgical techniques, particularly sinus node manipulation during cannulation and suturing, are implicated in the high rate of atrial arrhythmias.
• Findings suggest a need to consider these risks when developing new surgical approaches for atrial conditions.