Previous Diagnosis

Second degree AV block Mobitz type II (3:1)

What kind of arrhythmia is that?

Discussion

The ECG shows a three p waves ( one of which is inside the T wave, like it was looking upwardws ) for every one QRS complex. Furthermore, the last of the three p waves is the one that really makes the ventricles to depolarize ( QRS ), so that the atria and ventricles are not completely dissociated, ruling out complete atrioventricular block.

Even more, the pp interval is always contant. This characteristiscs make the diagnosis of a second degree AV block Mobitz type II. Also, the atrial frequency is exactly 100 beats per minute, ruling out the diagnosis of atrial flutter, which requires an atrial frequency above 250 beats per minute.

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