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.
Atrioventricular Heart Block Heart block occurs when the electrical impulses that make the heart beat do not transmit normally. Normally, these impulses travel from the heart's upper chambers, called the atria, to the lower chambers, called the ventricles, through the atrioventricular (AV) node. In heart block, the AV node may be damaged from surgery, medications or congenital heart conditions. Heart block affects the heart's ability to pump blood and the body's blood pressure, and can cause an abnormally slow heart rhythm called bradycardia. An implanted artificial pacemaker can restore a normal heart rate and rhythm. Heart block may cause the following symptoms: Chest pressure or pain. Fainting, also known as syncope, or near-syncope. Fatigue. Lightheadedness or dizziness. Palpitations, which can be skipping, fluttering or pounding in the chest.