Which classes of medications protects the ischemic myocardium by blocking catecholamines and sympathetic nerve stimulation? 

Beta blockers, also known as beta-adrenergic blocking agents, are medications that reduce your blood pressure. Beta blockers work by blocking the effects of the hormone epinephrine, also known as adrenaline.

When you take beta blockers, your heart beats more slowly and with less force, thereby reducing blood pressure. Beta blockers also help blood vessels open up to improve blood flow.

Beta-adrenergic blockers-rationale: beta-adrenergic blockers work by blocking beta receptors in the myocardium, reducing the response to catecholamines and sympathetic nerve stimulation. they protect the myocardium, helping to reduce the risk of another infarction by decreasing myocardial oxygen demand.

Beta blockers generally aren't used in people with asthma because of concerns that the medication may trigger severe asthma attacks. In people who have diabetes, beta blockers may block signs of low blood sugar, such as rapid heartbeat. It's important to monitor your blood sugar regularly.

Beta-adrenergic blockers-beta-adrenergic blockers work by blocking beta receptors in the myocardium, reducing the response to catecholamines and sympathetic nerve stimulation. they protect the myocardium, helping to reduce the risk of another infarction by decreasing the workload of the heart and decreasing myocardial oxygen demand. calcium channel blockers reduce the workload of the heart by decreasing the heart rate. narcotics reduce myocardial oxygen demand, promote vasodilation, and decreased anxiety. nitrates reduce myocardial oxygen consumption by decreasing left ventricular end-diastolic pressure (preload) and systemic vascular resistance (afterload).