Some consider 2:1 AV block to be type II block, claiming that the PR interval doesn't lengthen. What they don't realize is that determining whether the PR interval lengthens requires at least 2 ...
In second degree type II AV nodal block (a.k.a. Mobitz Type II AV block), the AV node becomes completely refractory to conduction on an intermittent basis. For example, three consecutive P waves may ...
In figure 1, the 4th beat in tracing (a) suddenly has a longer PR interval than the others. The findings in tracing (b) suggest AV Wenckebach phenomenon (type I 2° AV block). The findings in tracing ...
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