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Termination of ventricular bigeminy by conversion to concealed forms
Journal of Electrocardiology
|April 1, 1987
Summary
Overt ventricular bigeminy frequently converts to a concealed form, often indicated by specific patterns in sinus beats. This study highlights concealment as a common termination mode for ventricular bigeminy.
Area of Science:
- Cardiology
- Electrophysiology
- Cardiac Arrhythmias
Background:
- Ventricular bigeminy presents as either overt or concealed.
- Understanding the transition between these forms is crucial for arrhythmia management.
Purpose of the Study:
- To investigate the frequency of overt ventricular bigeminy converting to the concealed form.
- To identify patterns associated with this conversion.
Main Methods:
- Analysis of ambulatory electrocardiographic recordings from 25 patients.
- Examination of over 40 episodes of monomorphic ventricular bigeminy per patient.
- Statistical analysis (binomial distribution) of sinus beats between bigeminal events.
Main Results:
- A statistically significant predominance of odd or even sinus beats indicated conversion in 14 of 25 patients.
- Progressive prolongation of the coupling interval preceded termination in 74 episodes across 9 patients.
- Concealment is a prevalent mode of bigeminy termination.
Conclusions:
- Ventricular bigeminy frequently terminates via concealed mechanisms.
- Observed patterns suggest progressive conduction delay at the arrhythmogenic focus in some cases.