With 2nd-degree AV heart block, Type II, the PR intervals associated with the P waves which are followed by a QRS complex will be:

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In 2nd-degree AV block, Type II, the PR intervals of the P waves that are followed by a QRS complex remain constant. This type of block is characterized by a sudden failure of some P waves to conduct to the ventricles without a preceding change in the PR interval duration, unlike in Type I where the PR interval progressively lengthens until a beat is dropped.

With 2nd-Degree AV Heart Block, Type II, the PR Intervals