Analysis of surgically-induced right bundle branch block pattern using intracardiac recording techniques

Area of Science:

• Pediatric Cardiology
• Electrophysiology
• Cardiac Surgery

Background:

• Surgically-induced right bundle branch block (RBBB) is a recognized postoperative pattern.
• Understanding the long-term implications of RBBB in pediatric patients is crucial.

Purpose of the Study:

• To investigate subgroups within surgically-induced RBBB patterns.
• To assess the prognostic value of specific electrophysiological intervals in these patients.

Main Methods:

• Intracardiac recording of His bundle (H) and right ventricular apical (RVA) electrograms.
• Analysis of P-A, A-H, H-V, and V-RVA intervals in 16 pediatric patients with RBBB pattern.
• Correlation of V-RVA intervals with the presence or absence of left anterior hemiblock (LAH).

Main Results:

• Most patients were asymptomatic with normal sinus rhythm.
• Prolonged A-H, H-V, and V-RVA intervals were observed in some patients.
• V-RVA intervals were normal in 91% of patients without LAH but prolonged in 100% of patients with LAH.

Conclusions:

• Surgically-induced RBBB patterns may represent distinct subgroups.
• The V-RVA interval, particularly with the H-V interval, may be important for predicting long-term prognosis in RBBB patients.
• Distinguishing between RBBB with and without LAH is critical for understanding outcomes.