A client with coronary artery disease is being educated on dietary modifications to reduce the risk of complications. Which dietary advice should the nurse provide to the client?

Choice A reason: Clopidogrel is an anti-platelet agent that irreversibly inhibits the P2Y12 ADP receptor on platelets. This significantly increases the risk of prolonged bleeding. Due to this pharmacologic action, it is standard practice to hold this medication for approximately 5 to 7 days before surgical or invasive dental procedures to allow for the replacement of circulating platelets.

Choice B reason: Unlike heparin or warfarin, clopidogrel does not require routine laboratory monitoring of platelet counts or coagulation studies such as international normalized ratio or partial thromboplastin time. While monitoring for signs of bleeding is critical, regular lab checks are not standard for this specific medication, making this instruction incorrect.

Choice C reason: Dark, tarry stools (melena) are a clinical manifestation of upper gastrointestinal bleeding. Because clopidogrel significantly inhibits platelet function, this is a serious adverse effect, not an expected finding. The client must be educated to report such findings immediately as it indicates significant internal bleeding requiring medical intervention.

Choice D reason: Mild gastrointestinal upset can be a side effect, but the client should not discontinue the medication abruptly without consulting their healthcare provider. Abrupt cessation of anti-platelet therapy in a patient with a history of cardiac issues or stent placement significantly increases the risk of a life-threatening thrombotic event.

Choice A reason: Anticoagulants, such as heparin or low-molecular-weight heparins, are standard in the treatment of unstable angina to prevent further thrombus propagation. They do not possess significant systemic vasodilatory properties and do not cause or exacerbate hypotension in the clinical context of managing ischemic heart disease.

Choice B reason: Calcium channel blockers, such as diltiazem or amlodipine, are often indicated for patients with unstable angina to reduce coronary vasospasm and decrease myocardial workload. While they can lower blood pressure, they are therapeutic agents in this condition and are not contraindicted as a class for the specific risk of hypotension.

Choice C reason: Beta-blockers are a cornerstone of therapy for unstable angina because they decrease heart rate and myocardial contractility, thereby reducing oxygen demand. While they do decrease blood pressure, they are considered standard-of-care agents to prevent myocardial infarction and are not contraindicted due to hypotension in this clinical scenario.

Choice D reason: Phosphodiesterase-5 inhibitors, such as sildenafil or tadalafil, are strictly contraindicated in patients receiving nitrates for angina. Both classes increase cyclic guanosine monophosphate, leading to profound, potentially fatal systemic vasodilation and severe, refractory hypotension that can dangerously reduce coronary artery perfusion during an acute ischemic event.