Coronary blood flow to the left ventricle increases during all Except
Correct Answer: Early systole
Description: During early systole, coronary blood flow falls as coronary vessels are compressed by the contracting myocardium.A fall in PO2 has a potent vasodilator effect on coronary vessels. Adenosine released from hypoxic myocardium is also a potent vasodilator.Sympathetic stimulation increases the rate and force of contraction; the resulting increase in the rate of production of vasodilator metabolites dilates coronary vessels.Myocardial work and metabolism are increased in hypeension.Ref: Guyton; 13th edition
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