Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. An atrioventricular block (or AV block) involves the impairment of the conduction between the atria and ventricles of the heart. Strong vagal stimulation may produce AV block. The cholinergic receptor types affected are the muscarinic receptors. There are three types: * First degree AV block - PR interval greater than 0.20sec. * Second degree AV block - Type 1 (aka Mobitz 1, Wenckebach): Progressive prolongation of PR interval with dropped beats (the PR interval gets longer and longer; finally one beat drops) . Type 2 (aka Mobitz 2): PR interval remains unchanged prior to the P wave which suddenly fails to conduct to the ventricles. * Third degree AV block - No association between P waves and QRS complexes.

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