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Single lead electrocardiogram (ECG) showing Mobitz type II second degree atrioventricular (AV) block

Single lead electrocardiogram (ECG) showing Mobitz type II second degree atrioventricular (AV) block
The third and sixth P waves are not conducted through the AV node (there is no associated QRS complex). The PR interval is constant prior to and after the non-conducted beats.
Graphic 58649 Version 4.0
Sinus rhythm
The normal P wave in sinus rhythm is slightly notched since activation of the right atrium precedes that of the left atrium. The P wave is upright in a positive direction in leads I and II. A P wave with a uniform morphology precedes each QRS complex. The rate is between 60 and 100 beats per minute and the cycle length is uniform between sequential P waves and QRS complexes. In addition, the P wave morphology and PR intervals are identical from beat to beat.
Graphic 69872 Version 2.0