Vectorcardiogram of complete right bundle branch block with left axis deviation by the Frank and Kimura systems

Area of Science:

• Cardiology
• Medical Imaging
• Electrophysiology

Background:

• Investigating the relationship between electrocardiogram (ECG) findings of right bundle branch block (RBBB) with left axis deviation (LAD) and bilateral bundle branch conduction is crucial for accurate cardiac diagnosis.
• Vectorcardiography (VCG) offers a spatial representation of cardiac electrical activity, potentially providing insights beyond standard ECG.

Observation:

• 45 patients with complete RBBB and LAD were analyzed using both Frank and Kimura VCG systems.
• QRS loop patterns in the frontal plane varied significantly in the Frank system for RBBB with LAD.
• VCG analysis of RBBB complicated by left anterior hemiblock revealed specific QRS loop orientations in the frontal plane.

Findings:

• The Frank VCG system demonstrated diverse QRS loop patterns in the frontal plane for patients with RBBB and LAD.
• In cases of RBBB with left anterior hemiblock, the QRS loop predominantly extended superiorly or leftward in the frontal plane.
• The Kimura VCG system demonstrated potential utility as a supplementary diagnostic method.

Implications:

• Understanding VCG patterns in RBBB with LAD can refine diagnostic accuracy.
• The Kimura system may serve as a valuable adjunct to standard ECG and Frank VCG for complex conduction abnormalities.
• Further research validating the Kimura system's diagnostic performance is warranted.