What do you understand by myocardial oxygen requirement?

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All these drug groups useful in angina both decrease myocardial oxygen requirement (by decreasing the determinations of oxygen demand) and increase myocardial oxygen delivery (by reversing coronary arterial spasm), EXCEPT:

a) Nitrates and nitrite drugs (Nitroglycerin, Isosorbide dinitrate)

b) Calcium channel blockers (Nifedipine, Nimodipine)

c) Beta-adrenoceptor-blocking drugs (Atenolol, Metoprolol)

d) Potassium channel openers (Minoxidil)

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