Final answer:
Nitroglycerin is the medication prescription that decreases both preload and afterload in a client with acute myocardial infarction.
Step-by-step explanation:
The medication prescription that decreases both preload and afterload in a client with acute myocardial infarction is nitroglycerin. Nitroglycerin is a vasodilator that relaxes the smooth muscle in the tunica media of coronary vessels, reducing the resistance in the vascular system. This decrease in resistance helps to decrease both preload (the tension in the ventricles before contraction) and afterload (the tension the ventricles must develop to pump blood against resistance).
The medication prescription that decreases both preload and afterload is Nitroglycerin. Nitroglycerin is a vasodilator that helps relax and dilate blood vessels, reducing both the amount of blood returning to the heart (preload) and the resistance against which the heart pumps (afterload).