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QRS normalization of bundle branch block by ventricular fusion
The Tokai Journal of Experimental and Clinical Medicine
|October 1, 1984
Summary
A patient with acute myocardial infarction experienced complete atrio-ventricular block. This case describes QRS normalization in right bundle branch block due to ventricular fusion, a rare finding in cardiology.
Area of Science:
- Cardiology
- Electrophysiology
- Internal Medicine
Background:
- Acute myocardial infarction can lead to complex cardiac conduction abnormalities.
- Right bundle branch block (RBBB) is a common finding post-myocardial infarction.
- Complete atrio-ventricular (AV) block represents a critical disruption of cardiac electrical signaling.
Observation:
- A 61-year-old female presented with acute inferior myocardial infarction and pre-existing right bundle branch block.
- The patient subsequently developed complete atrio-ventricular block.
- A unique phenomenon of QRS normalization was observed during the complete AV block.
Findings:
- The QRS normalization in the context of RBBB was attributed to ventricular fusion.
- This fusion resulted from the interplay between a conducted sinus beat and an ipsilateral idioventricular impulse.
- The idioventricular impulse originated from the same side of the heart as the RBBB.
Implications:
- This case highlights an unusual compensatory mechanism during complete AV block.
- Understanding ventricular fusion is crucial for interpreting complex electrocardiograms in myocardial infarction patients.
- Such findings contribute to the understanding of cardiac electrophysiology and conduction system disturbances.