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The mechanism of flutter interval alternans
M B Waxman1, J A Kirsh, D A Cameron
1Department of Medicine, University of Toronto, Canada.
Pacing and Clinical Electrophysiology : PACE
|February 1, 1990
Summary
Ventricular systole prolongs atrial flutter intervals by increasing atrial volume and pressure. This finding clarifies the mechanism of atrial flutter alternans, offering insights into cardiac electrophysiology.
Area of Science:
- Cardiology
- Cardiac Electrophysiology
- Atrial Arrhythmias
Background:
- Atrial flutter alternans is a complex phenomenon requiring further mechanistic understanding.
- Investigating the relationship between ventricular activity and atrial flutter cycles is crucial for arrhythmia management.
Observation:
- Ventricular systole transiently increased atrial volume and/or pressure.
- Flutter cycle intervals following ventricular systole were consistently prolonged by up to 30 msec.
- Prolongation was observed across different electrode configurations, ruling out motion artifact as the primary cause.
Findings:
- Ventricular systole directly influences atrial flutter cycle length.
- The mechanism involves alterations in the atrial flutter reentry circuit due to mechanical changes.
Implications:
- Provides a novel mechanistic explanation for atrial flutter alternans.
- Understanding this interaction may lead to improved therapeutic strategies for atrial arrhythmias.
- Highlights the electromechanical coupling in cardiac arrhythmias.