AV block with 2:1 conduction
MSP221 recording · 05
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
- Two P waves per QRS.
- Alternating conducted and nonconducted P waves.
Where to look. Count P waves and QRS complexes on the long strip. Every other P wave conducts.
Consecutive conducted PR intervals are unavailable for comparison. Describe 2:1 block and seek other localization clues.
The source diagnosis is retained; no additional clinical cause is inferred.
References & provenance
John Hampton; Joanna Hampton. The ECG Made Easy, 9th ed. (2019), ch. 3, pages du PDF / PDF pp. 73-74.
Second-degree AV block, largely 2:1 on visible strip
James Heilman, MD. Second-degree AV block, largely 2:1 on visible strip. https://commons.wikimedia.org/wiki/File:2ndDegreeType2.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
Second-degree AV block, largely 2:1 on visible strip
Second-degree AV block, largely 2:1 on visible strip
Original source labels retained. Question wording limited to visible findings; no independent clinical validation claimed.