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Second Degree Block Type Two example three



This strip begins with sinus rhythm.  There is an aberrantly conducted premature junctional
contraction after the sixth sinus beat, a non-sinus supraventricular beat follows (note the
differently shaped P-wave), then another PJC.  Note the retrograde P-wave accompanying this PJC.
A non-conducted P-wave follows on the heels of this second PJC and the atrial impulse arrives
while the A-V node is completely refractory.   This probably shouldn't be called a blocked beat,
but a non-conducted one.