CLINICAL ECG

Ventricular pacing

MSP221 recording · 13

DOCUMENTED HISTORY

Clinical history not documented in this image source.

De-identified clinical ECG tracing — Open image ↗

Original waveform retained; quiz cropping only removes off-tracing interpretation or a row containing an answer label. Some sources are rhythm strips rather than a full 12-lead ECG.

Look for

Spikes preceding QRS complexes.
Broad paced QRS complexes.

Where to look. Find pacing spikes immediately before broad QRS complexes; source arrows mark retrograde P waves.

Ventricular pacing changes activation and often repolarization. Spikes can be subtle; not every pacing mode produces wide QRS complexes.

The source diagnosis is retained; no additional clinical cause is inferred.

References & provenance

John Hampton; David Adlam. The ECG Made Practical, 7th ed. (2019), ch. 5, pages du PDF / PDF pp. 188-189.

Ventricular pacing with 1:1 retrograde VA conduction

Jer5150; image credit Jason E. Roediger, CCT, CRAT. Ventricular pacing with 1:1 retrograde VA conduction. https://commons.wikimedia.org/wiki/File:V-paced_with_1-to-1_retroconduction.png. CC BY-SA 3.0. Adaptation: lossless metadata removal/encoding; quiz crop removes off-tracing labels/interpretive panels where applicable. Derivative image retains the same license. CC BY-SA 3.0

Adaptation: cropping and removal of headers/annotations outside the tracing where applicable; metadata removed. Waveforms have not been redrawn.

Compared with the published source; no independent clinical validation is claimed.

Original annotations & limitations

Ventricular pacing with 1:1 retrograde VA conduction

Original source labels retained. Question wording limited to visible findings; no independent clinical validation claimed.