English to French Medical Medical: Cardiology cardiac cycle

During atrial systole, both atria contract to push blood through the atrioventricular valves (mitral and tricuspid) into the ventricles. Atrial pressure rises during the contraction, then quickly lowers as blood flows into the ventricles. The conduction delay at the atrioventricular node allows time for increased filling of the ventricles. This atrial contribution to ventricular filling is called *atrial kick*. It accounts for 20 to 30% of the blood volume of the ventricles at the end of diastole.

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