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Related Experiment Videos

Apparent P wave undersensing in a DDD pacemaker post exercise.

B M van Gelder1, R van Mechelen, K den Dulk

  • 1Department of Cardiology, Catharina Hospital, Eindhoven, The Netherlands.

Pacing and Clinical Electrophysiology : PACE
|November 1, 1992
PubMed
Summary
This summary is machine-generated.

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DDD pacemakers typically show symmetrical Wenckebach behavior. This case report details a patient with an asymmetrical pacemaker response during exercise, highlighting varied responses in individuals with intermittent AV conduction.

Area of Science:

  • Cardiology
  • Biomedical Engineering

Background:

  • DDD pacemakers are designed to manage heart rhythms by coordinating atrial and ventricular pacing.
  • Wenckebach behavior in DDD pacemakers usually presents symmetrically during rate changes, with similar responses during acceleration and deceleration.

Observation:

  • This case report describes a patient with intermittent atrioventricular (AV) conduction during exercise testing.
  • The patient exhibited 1:1 atrial sensing and ventricular pacing until the atrial rate surpassed the upper rate limit of 140 beats per minute.

Findings:

  • Unlike typical symmetrical responses, this patient demonstrated an asymmetrical Wenckebach behavior.
  • Atrial sensing was restored during the recovery phase as the conducted sinus rhythm decreased to 105 beats per minute.

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Implications:

  • This case highlights that Wenckebach behavior in DDD pacemakers can be asymmetrical, particularly in patients with intermittent AV conduction.
  • Understanding these asymmetrical responses is crucial for accurate pacemaker programming and patient management during exercise stress.