Perfusion Index and Pacemaker Capture

Artificial Intelligence Doctor — educational content (not a substitute for medical care).

Summary: Effective pacing stabilizes stroke volume and pulse pressure, often resulting in a stronger peripheral perfusion signal; severe bradycardia or loss of capture can reduce cardiac output and lower the perfusion index.

Questions & Answers

  1. Why might perfusion index drop when pacemaker capture is lost?
    Severe bradycardia and reduced stroke volume during non‑capture lower peripheral pulse amplitude detected by sensors.
  2. Can perfusion index alone diagnose capture failure?
    No. It is supportive only. Confirm with device interrogation, ECG, and clinical evaluation.
  3. What other clues suggest nocturnal capture problems?
    Morning fatigue, dizziness, wearable bradycardia alerts, and abnormal device logs suggest night‑time issues.