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Characterization of pacemaker arrhythmias due to normally functioning AV demand (DVI) pulse generators
Pacing and Clinical Electrophysiology : PACE
|November 1, 1980
Summary
Normally functioning DVI pacemakers can cause complex cardiac arrhythmias, not pacemaker malfunctions. These devices may exhibit irregular atrial pacing rates and unique arrhythmias like pseudopseudofusion beats.
Area of Science:
- Cardiology
- Biomedical Engineering
Background:
- Dual-chamber pacemakers, specifically DVI (Demand Ventricular Inhibited) mode, are designed for cardiac rhythm management.
- Understanding pacemaker behavior is crucial for accurate diagnosis of cardiac arrhythmias.
Purpose of the Study:
- To elucidate the mechanisms by which normally functioning DVI pulse generators can induce complex cardiac arrhythmias.
- To differentiate these induced arrhythmias from actual pacemaker malfunctions.
Main Methods:
- Analysis of electrophysiologic recordings and pacemaker output characteristics.
- Theoretical modeling of DVI pacing intervals and interactions with intrinsic cardiac activity.
Main Results:
- DVI generators without an atrial refractory period can lead to irregularly shortened atrial pacing intervals and increased atrial rates.
- Arrhythmia variations are influenced by intrinsic sinus rate, AV conduction, ventricular sensing timing, and programmed AV sequential time.
- Specific arrhythmias observed include pseudopseudofusion beats, double pseudofusion beats, and double pacemaker impulses within the QRS complex.
Conclusions:
- Complex cardiac arrhythmias generated by DVI pacemakers do not necessarily indicate device malfunction.
- Careful electrophysiologic assessment is required to correctly interpret these pacing-induced arrhythmias.