14. Choice B is the correct answer. With second degree type I AV block the PR interval lengthens until the QRS complex is dropped. The PR interval is greater than 0.2 seconds. This rhythm is also called Wenckebach. With second degree type II AV block there is a normal PR interval and there is a dropped QRS complex. It is also referred to as Mobitz Type II. With first degree AV block there is just a prolonged PR interval greater than 0.2 seconds. Third degree AV block is complete AV dissociation.
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