This phase usually lasts for 6% of the cardiac cycle. With all valves closed, the ventricle generates positive pressure without any change in its volume (isovolumetric) to overcome the semilunar valves resistance that open at point (b). Isovolumetric ventricular contraction (a-b): This phase marks the beginning of systole and starts with the appearance of the QRS complex on the EKG and the closure of the AV valves at point (a). ![]() The cardiac cycle represents the hemodynamic and electric changes that occur in systole and diastole. ![]() The bottom line represents the first and second heart sounds. The electrocardiogram (EKG) below the diagram shows the corresponding waves with each phase of the cardiac cycle. ![]() Cardiac cycle of the left side of the heart.
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