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Blocul atrioventricular se manifesta atunci cand impulsurile electrice de la nivelul atriilor catre ventriculi (prin tesutul de conducere, ajung cu intarziere sau deloc, fara ca vasele sanguine sa fie blocate.
Blocul atrioventricular de gradul II apare atunci cand impulsurile de la atrii nu ajun in totalitate la ventriculi.