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Ventricular tachycardia induced by slow ventricular pacing
Israel Journal of Medical Sciences
|December 1, 1984
Summary
Ventricular pacing at physiological rates can trigger ventricular tachycardia (VT) in susceptible patients. Pacing rate, stimulation site, and antiarrhythmic drugs are key factors in VT induction.
Area of Science:
- Cardiology
- Electrophysiology
- Cardiac Arrhythmias
Background:
- Ventricular pacing is a common treatment for bradyarrhythmias.
- Physiological pacing rates aim to mimic normal heart function.
- Certain patient conditions may predispose to arrhythmias during pacing.
Observation:
- Two cases are presented where ventricular pacing at 72-75 beats/min induced ventricular tachycardia (VT).
- VT occurred during posterobasal pacing in one patient but not outflow tract pacing.
- VT onset correlated with sinus rate in the second patient with a left ventricular aneurysm.
Findings:
- Pacing rate, ventricular stimulation site, and antiarrhythmic drug administration were identified as potential triggers for VT.
- These factors may exacerbate pre-existing intraventricular conduction disturbances, facilitating reentry mechanisms.
- The study highlights the complexity of pacing-induced arrhythmias in specific cardiac conditions.
Implications:
- Early identification of these triggering factors is crucial for managing VT in paced patients.
- Understanding these mechanisms can guide adjustments in pacing parameters and drug regimens.
- This research contributes to safer and more effective cardiac pacing strategies.