Atrial pacing
MSP221 recording · 02
Clinical history not documented in this image source.
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 before P waves.
- Relatively narrow conducted QRS complexes.
Where to look. Find spikes before P waves, then the conducted QRS complexes.
The pulse triggers atrial activation. With intact AV conduction, the following QRS can retain its usual morphology.
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. 198-199.
James Heilman, MD. Atrial pacing. https://commons.wikimedia.org/wiki/File:AtrialPacemakerECG.JPG. 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
Atrial pacing
Atrial pacing
Original source labels retained. Question wording limited to visible findings; no independent clinical validation claimed.