APPLIED RADIOLOGICAL ANATOMY

Detailed explanation-1: -The typical value for the ejection fraction is 70/120=0.58. peak pressure of about 25 mmHg (pulmonary circulation) or 120 mmHg (systemic circulation).

Detailed explanation-2: -The blood pressure in the big arteries rises due to rapid ejection to reach the maximum value of 120 mmHg and 25 mmHg in the aorta and the pulmonary artery, respectively (= systolic pressure). During the slow ejection, the blood pressure in the systemic and pulmonary circulations starts to drop progressively (fig.

Detailed explanation-3: -Aortic pressure declines as the blood ejected into the aorta during the previous ventricular contraction flows to the peripheral circulation. Atrial contraction provides a final boost to ventricular volume immediately before ventricular systole.

Detailed explanation-4: -Rapid ejection (b-c): As the semilunar valves open at point (b), there is a rapid ejection of blood due to increased ventricular contractility. The arterial pressure increases until reaching it maximum at point (c). This phase usually lasts for 13% of the cardiac cycle.