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Orthodromic and antidromic pacemaker circus movement tachycardia
G H Von Knorre1, B Ismer, W Voss
1Department of Cardiology, University of Rostock, Germany.
Pacing and Clinical Electrophysiology : PACE
|August 1, 1991
Summary
Pacemaker circus movement tachycardia (PCMT) can be prevented by programming atrial stimuli after ventricular beats. However, one patient experienced unusual PCMT due to preserved antegrade conduction, leading to a novel tachycardia pattern.
Area of Science:
- Cardiology
- Electrophysiology
- Medical Devices
Background:
- Pacemaker circus movement tachycardia (PCMT) typically involves retrograde natural and antegrade electronic atrioventricular (AV) conduction.
- Prevention strategies often include programming atrial stimuli after ventricular premature beats (VPBs).
Observation:
- A patient with preserved antegrade but absent retrograde (VA) conduction was studied.
- An optional pacemaker mode, stimulating the atrium synchronously after a VPB, was activated.
Findings:
- This pacemaker mode triggered an unusual PCMT.
- The tachycardia was sustained by retrograde electronic and antegrade natural AV conduction.
- This represents an orthodromic type of PCMT, distinct from the usual antidromic form.
Implications:
- This case highlights a rare mechanism of PCMT in patients with specific conduction properties.
- Understanding these mechanisms is crucial for optimizing pacemaker programming and preventing tachycardia.
- It suggests that pacemaker algorithms may need to consider individual VA conduction characteristics.