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Cardiac pacemaker twiddler syndrome

Last edited: 4/15/2026

Overview

Cardiac pacemaker twiddler syndrome, often associated with pacemaker syndrome (PS), refers to symptoms arising from inappropriate pacemaker programming or mechanical dislodgement, leading to inadequate cardiac resynchronization and hemodynamic compromise. In pediatric populations, particularly those with congenital complete atrioventricular block (CAVB), PS can develop due to prolonged ventricular pacing without atrial contribution 1.

Diagnosis

  • Key Symptoms: Dyspnea, fatigue, exercise intolerance, and signs of heart failure 1.
  • Recommended Tests: Exercise stress test to differentiate symptoms related to pacing mode 1.
  • Grading: No standardized grading system mentioned; clinical assessment and response to reprogramming are crucial 1.

    • Management

  • First-Line Treatment: Reprogramming the pacemaker to restore AV synchrony, potentially switching to dual-chamber pacing 1.
  • Adjunctive Measures: Regular follow-up to monitor symptoms and adjust settings as needed 1.

    • Special Populations

  • Pediatrics: Prolonged ventricular pacing duration correlates with increased risk of PS in children with CAVB 1. Dual-chamber pacing may be protective but requires further evidence 1.

    • Key Recommendations

  • Monitor and adjust pacemaker settings, particularly in pediatric patients with prolonged ventricular pacing, to prevent development of PS (Evidence: Moderate 1).
  • Consider initial implantation of dual-chamber pacemakers in pediatric patients with CAVB to mitigate risk of PS, though evidence is limited (Evidence: Expert opinion 1).
  • Regular clinical reassessment and exercise stress testing are essential for early detection and management of PS symptoms (Evidence: Moderate 1).

    • References

    1 Horenstein MS, Karpawich PP. Pacemaker syndrome in the young: do children need dual chamber as the initial pacing mode?. Pacing and clinical electrophysiology : PACE 2004. link

    Original source

    1. [1]
      Pacemaker syndrome in the young: do children need dual chamber as the initial pacing mode? — Horenstein MS, Karpawich PP Pacing and clinical electrophysiology : PACE (2004)
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