Failure to capture

Failure to capture is a pacemaker malfunction where there are pacemaker spikes on the ECG but these do not trigger myocardial depolarisation so they are not followed by the expected ECG waves. Causes include pacemaker lead displacement or damage, electrolyte problems, infarction or conduction block.

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ECG Library (4)

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In the ECGquest archives, this ECG has been tagged with: - Weakness 12-Lead Failure to capture Dr Smith's ECG Blog CC BY-NC
Extreme Bradycardia: a Case-Based Lesson in Pacing 27732

This ECG is from a woman who presented with weakness on a background of recent pacemaker insertion.

In the ECGquest archives, this ECG has been tagged with: - Syncope 12-Lead Pacemaker spikes Failure to capture ECG of the Week CC-BY-NC-SA
ECG of the Week – 10th September 2018 – Interpretation 27483

This ECG is from a man in his 90s who presented following an episode of syncope.

In the ECGquest archives, this ECG has been tagged with: - Rhythm Strip Transcutaneous pacing artefact Pacemaker spikes Failure to capture ECG Guru CC-BY-NC-SA
Transcutaneous Pacemaker: Failure to Capture and False QRS Artifact 1011