PMC3200192_01
Initial ECG demonstrating tall, symmetric T waves, and prolonged PR intervals (P waves marked with arrows).
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fig1
The providers further interpreted this ECG to show a prolonged PR interval and peaked T waves (Figure 1).
Rhythm strip showing progressive PR prolongation with subsequent dropped QRS complex, consistent with Wenckebach (P waves marked with arrows).
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fig2
His rhythm strip revealed grouped beating, with a PR interval that progressively prolonged with each of three successive QRS complexes, followed by a nonconducting P wave (Figure 2).
ECG following resolution of hyperkalemia, with first-degree AV block (PR interval 232 ms) and resolution of peaked T waves.
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fig3
His ECG immediately prior to discharge demonstrated resolution of the previously seen Wenckebach pattern, however, with a persistently prolonged PR interval of 232 ms consistent with type 1 AV block, and normal T wave morphology (Figure 3).