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.
Infective endocarditis, diphtheria, rheumatic fever, Chagas disease, Lyme disease, and tuberculosis all may be associated with first-degree AV block. Extension of the infection to the adjacent myocardium in native or prosthetic valve infective endocarditis (ie, ring abscess) can cause AV block.