In which of the following types of AV heart block does the PR interval remain constant?

Question

Quizplus · Accepted Answer

In 2nd-degree AV heart block, Type II, the PR interval remains constant before a non-conducted P wave, unlike in Wenckebach (Type I) where the PR interval progressively lengthens until a beat is dropped, or in 3rd-degree AV block where there is no consistent relationship between P waves and QRS complexes, indicating a complete dissociation.

In Which of the Following Types of AV Heart Block