Isovolumetric contraction

In cardiac physiology, isovolumetric contraction is an event occurring in early systole during which the ventricles contract with no corresponding volume change (). This short-lasting portion of the cardiac cycle takes place whilst all heart valves are closed.

In a healthy young adult, blood enters the atria and flows to the ventricles via the opened atrioventricular valves (tricuspid and mitral valves). Atrial contraction rapidly follows, actively pumping about 20% of the returning blood. As diastole ends, the ventricles begin depolarizing and, while ventricular pressure starts to rise owing to contraction, the atrioventricular valves close in order to prevent backflow to the atria. At this stage, which corresponds to the R peak or the QRS complex seen on an ECG, the semilunar vales (aortic and pulmonary valves) are also closed. The net result is that, while contraction causes ventricular pressures to rise sharply, there is no overall change in volume because of the closed valves. The isovolumetric contraction phase lasts about 0.03 s, but this short period of time is enough to build up a sufficiently high pressure that eventually overcomes that of the aorta and the pulmonary trunk upon opening of the semilunar valves. This process, therefore, helps maintain the correct unidirectional flow of blood through the heart and circulatory system.

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