The Wonders of Water. Water is one of the most basic elements of life but figuring out how much we ought to drink hasn't always been so simple. Most of us grew up thinking we needed to drink eight glasses of water each day, in addition to any other drinks we might choose.
Atrioventricular (AV) block is a type of abnormal heart rhythm, or arrhythmia. The heartâs rhythm (heartbeat) is regulated by natural electrical impulses that travel through the heart muscle.These impulses tell the heartâs chambers when to contract.trioventricular (AV) block is a type of abnormal heart rhythm, or arrhythmia. The heartâs rhythm (heartbeat) is regulated by natural electrical impulses that travel through the heart muscle.
Answer 2: In second degree type I AV block (Wenckebach), there is progressive prolongation of the PR interval until a beat is lost. Answer 3: In second degree type II AV block, dropped beats are not preceded by prolongation of the PR interval (as in second degree type I block). Answer 4: First degree AV block is characterized by prolongation of the PR interval (above 200 msec).