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.
Conduction block: The electrical pathway may also be blocked near the AV node, in between the atria and ventricles. A conduction block doesn't completely stop the heartbeat because another set of cells in the AV node or ventricles act as a secondary pacemaker. When this backup system goes into effect, the heartbeat is slower than when it is regulated by the SA node, which serves as the atrial pacemaker.