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Definition
To contract, the heart muscle (the myocardium) requires an electric nervous impulse, which propagates inside the heart. Thus, a nervous impulse crosses the different cavities of the heart, atria and ventricles, so as their contractions aresynchronized. The nervous impulse therefore, in a first time, crosses the atria, which first contract in order to send blood into the ventricles, which finally contract to eject blood into the arteries. An atrioventricular block is defined as a conduction disorder of the nervous impulse at the level of the atrioventricular junction, i.e. between the atrium and the ventricle. File last reviewed on dec 18, 2011 |
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DEFINITION 
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in cardiology.