Correct Answer: D

Rationale: Nitroglycerin acts by dilating the coronary arteries, leading to increased blood flow and oxygen supply to the heart. This helps in relieving angina symptoms by reducing the heart's workload and improving blood supply to the myocardium.

Correct Answer: D

Rationale: Erectile dysfunction drugs are contraindicated with Nitroglycerin because they can potentiate the hypotensive effects of Nitroglycerin, leading to severe hypotension.

Correct Answer: A

Rationale: Metoprolol, a beta-blocker, is contraindicated in clients with bradycardia as it can further lower the heart rate, potentially leading to more serious complications. Bradycardia is defined as a heart rate below 60 beats per minute and administering metoprolol in such cases can exacerbate this condition, causing adverse effects on cardiac output.

Correct Answer: B

Rationale: The correct instruction for a client using nitroglycerin transdermal patches is to remove the patch every night before bedtime. This is essential to prevent tolerance to the medication's effects. Continuous exposure to nitroglycerin can lead to the body becoming less responsive to its therapeutic effects over time, making it less effective in managing the condition it is prescribed for.

Correct Answer: C

Rationale: Enoxaparin is administered subcutaneously, typically in the abdomen to ensure proper absorption. Massaging the injection site should be avoided to prevent bruising or bleeding under the skin.