A nurse is educating a group of clients about the risk factors for myocardial infarction (MI). Which risk factor is considered a non-modifiable risk factor for MI?

A) This choice is incorrect because while rest is essential during an angina episode, lying down in bed for an extended period is not necessary after administering nitroglycerin.

B) This choice is incorrect because monitoring blood pressure and heart rate every 15 minutes is not a standard nursing intervention after nitroglycerin administration. Monitoring vital signs as needed for the client's condition is appropriate.

C) This choice is incorrect because there is no need for the client to avoid drinking water or fluids after taking sublingual nitroglycerin.

D) This choice is correct. After taking sublingual nitroglycerin for chest pain relief, the client should sit or lie down and avoid sudden position changes. Nitroglycerin can cause systemic vasodilation and may lead to orthostatic hypotension, increasing the risk of dizziness or falls if the client stands up abruptly. Taking a seated or lying position reduces this risk and allows the medication to work effectively to relieve chest pain.

A) This choice is incorrect because smoking is a modifiable risk factor for MI. Cessation of smoking can significantly reduce the risk of developing MI and other cardiovascular diseases.

B) This choice is incorrect because a sedentary lifestyle is a modifiable risk factor for MI. Engaging in regular physical activity can help reduce the risk of MI.

C) This choice is incorrect because diabetes mellitus is a modifiable risk factor for MI. Managing diabetes through lifestyle changes, medications, and blood sugar control can help reduce the risk of cardiovascular complications, including MI.

D) This choice is correct. A family history of MI is a non-modifiable risk factor because it is based on genetic factors that cannot be changed through lifestyle modifications. Having a close relative with a history of MI increases an individual's risk of developing MI, but it cannot be altered or eliminated through lifestyle changes.