During which event of the cardiac cycle does aortic pressure reach its maximum?

Aortic pressure reaches its maximum during ventricular ejection. This phase of the cardiac cycle occurs when the ventricles contract and blood is forcefully expelled into the aorta. As the left ventricle contracts, the blood volume rapidly increases the pressure within the aorta, leading to the peak or maximum aortic pressure.

Understanding this phase is crucial in cardiology as it reflects the efficiency of the heart's pumping action and the health of the heart valves. The other phases—ventricular filling, atrial contraction, and isovolumetric relaxation—do not involve the same levels of pressure increase in the aorta, as they are characterized by different actions of the heart and the flow of blood.