Electrophysiological abnormalities before and after surgery for atrial septal defect

Area of Science:

• Pediatric Cardiology
• Electrophysiology
• Congenital Heart Disease

Background:

• Atrial septal defect (ASD) is a common congenital heart condition.
• Electrophysiological abnormalities can be associated with ASD.
• The impact of ASD on cardiac electrophysiology in children requires further investigation.

Purpose of the Study:

• To evaluate electrophysiological parameters in children with ASD before and after surgical repair.
• To identify specific electrophysiological abnormalities present in this population.
• To assess the effect of surgical intervention on these abnormalities.

Main Methods:

• Electrophysiological studies were performed in 28 children with ASD before and after surgery.
• Parameters assessed included atrial-His interval, His-ventricular interval, Wenckebach cycle length, corrected sinus node recovery time (CSNRT), and sinoatrial conduction time (SACT).
• Patients were analyzed based on age groups and compared pre- and post-operatively.

Main Results:

• Preoperative electrophysiological abnormalities were detected in 79% of patients.
• Older children exhibited higher mean values for most electrophysiological parameters.
• Following surgery in 17 patients, significant decreases were observed in atrial-His interval, Wenckebach cycle length, CSNRT, and atrial effective refractory period (AERP), with normalization in many cases.

Conclusions:

• Electrophysiological abnormalities are prevalent in children with ASD, even before surgical correction.
• The severity of these abnormalities appears to correlate with age.
• Surgical repair of ASD leads to a degree of improvement in these electrophysiological parameters.