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The patient was a 22-year-old man with a 8-year history of episodes of a rapid heart rhythm. A 12-lead ECG during sinus rhythm (not shown) was normal. The ECG of Fig. 1 was recorded in the catheterisation room after adenosine administration and shows sinus rate slowing, changes in QRS configuration and an episode of complete AV block. Thereafter AV conduction resumes.
Twelve-lead ECG after adenosine administration during sinus rhythm
Can you explain the QRS changes in beats 3 to 6, and those in beats 7 to 11?
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Timmermans, C., Wellens, H. A surprising finding after adenosine administration. Neth Heart J 25, 592–593 (2017). https://doi.org/10.1007/s12471-017-0993-0
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DOI: https://doi.org/10.1007/s12471-017-0993-0