A patient has tachycardia. Would you recommend a drug that prolongs or shortens the plateau of cardiac muscle cell action potentials?

A patient has tachycardia. Would you recommend a drug that prolongs or shortens the plateau of cardiac muscle cell action potentials?
Is blood flow through the coronary circulation greatest during systole or diastole? Explain.

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A friend tells you that her son had an ECG, and it revealed that he has a slight heart murmur. Are you convinced that he has a heart murmur? Explain.