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Bradycardia-dependent aberrancy in type I second-degree atrioventricular block
S R Mittal1, R K Saxena, J P Sethi
1J.L.N. Medical College and Hospital, Ajmer (Rajasthan), India.
International Journal of Cardiology
|October 1, 1987
Summary
We describe a rare case of bradycardia-dependent aberrancy in the left posterior fascicle during type I second-degree atrioventricular block. This occurred with acute inferior myocardial infarction, highlighting the need for prophylactic pacing.
Area of Science:
- Cardiology
- Electrophysiology
- Cardiac Electrophysiology
Background:
- Acute inferior myocardial infarction can precipitate various conduction abnormalities.
- Type I second-degree atrioventricular block (Mobitz I) is characterized by progressive PR interval prolongation.
- Left posterior fascicular block (LPFB) is a type of intraventricular conduction delay.
Observation:
- A case of bradycardia-dependent left posterior fascicular aberrancy was observed.
- This aberrancy occurred concurrently with type I second-degree atrioventricular block.
- The clinical setting was acute inferior myocardial infarction.
Findings:
- Bradycardia-dependent aberrancy can manifest in the left posterior fascicle.
- The combination of Mobitz I AV block and LPFB in myocardial infarction is a critical finding.
- Aberrant conduction can be influenced by heart rate in specific fascicular blocks.
Implications:
- Prophylactic pacing may be necessary in patients with this specific conduction pattern.
- Understanding rate-dependent conduction abnormalities is crucial for patient management.
- This case underscores the importance of comprehensive electrocardiogram interpretation in acute coronary syndromes.