Second degree AV block

Second degree AV block

Second degree AV block
Second degree AV block

There is a limitation in interpreting the rhythm as a long rhythm strip is not available. The PR interval of the first beat is quite prolonged so that it overlaps with the T wave of the previous beat. The next P wave, marked in red colour, is superimposed on the T wave as well as non conducted, resulting in a pause. The PR interval of the second beat is less prolonged as the conduction recovers partially following the blocked beat and the pause. The next PR interval is again prolonged. So overall the ECG shows a 3:2 type I AV block, with a bigeminal rhythm. QRS complex is narrow, indicating a supra Hisian location of the block. These features fit in with the Wenckebach phenomenon or Mobitz type 1 second degree AV block.

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