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A case of ventricular undersensing in the DDI mode: cause and correction
Pacing and Clinical Electrophysiology : PACE
|September 1, 1986
Summary
Pacemakers can misinterpret heartbeats, causing inappropriate pacing. Adjusting the ventricular blanking period resolved this ventricular undersensing issue in DDI pacing mode.
Area of Science:
- Cardiology
- Biomedical Engineering
- Electrophysiology
Background:
- Pacemaker implantation requires careful programming to ensure appropriate sensing and pacing.
- The DDI pacing mode is designed to provide dual-chamber pacing while inhibiting ventricular pacing during intrinsic ventricular activity.
Observation:
- Intermittent, inappropriate ventricular pacing was observed during electrocardiographic monitoring post-pacemaker implantation.
- These inappropriate outputs occurred after the intrinsic R wave, timed with the programmed atrioventricular (AV) interval.
Findings:
- The observed inappropriate pacing was attributed to ventricular lead undersensing.
- Undersensing occurred when the patient's intrinsic ventricular complex coincided with the pacemaker's ventricular blanking period.
Implications:
- Ventricular undersensing in DDI mode can lead to suboptimal pacing therapy.
- Reprogramming the ventricular blanking period is a viable solution to correct this specific pacing malfunction.
- This case highlights the importance of understanding pacemaker blanking periods for troubleshooting pacing issues.