The primary mechanism of antianginal action of beta blocker is . . . (poll 7163554)

The primary mechanism of antianginal action of beta blocker is . . .

Reduces Heart rate by blocking catecholamine surge and lower MVO2

Reduces myocardial contractility and wall stress and hence promotes sub-endocardial blood flow .

Reduces LV after load by reducing peripheral vascular ressitance

Dilates coronary artery by an unknown mechanism

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