A patient reports insomnia and is prescribed a non-benzodiazepine hypnotic.
Which of the following is an important teaching point?

Choice A rationale

Methadone is metabolized by the liver, and long-term use can lead to liver toxicity and elevated liver enzymes. It is crucial to monitor liver function tests (LFTs) such as alanine aminotransferase (ALT) and aspartate aminotransferase (AST) to detect hepatic impairment. The normal range for ALT is typically 7 to 56 U/L, and for AST, it is 10 to 40 U/L.

Choice B rationale

Methadone can affect the cardiovascular system, leading to dose-dependent hypotension or hypertension. Regular blood pressure monitoring is essential to detect and manage these fluctuations, preventing complications like syncope or organ damage. The normal range for blood pressure is less than 120/80 mm Hg, and variations outside this range require careful clinical assessment.

Choice C rationale

A primary risk of methadone, an opioid, is respiratory depression, which can be life-threatening. This side effect is a major concern, especially when initiating treatment or adjusting the dose. Monitoring the patient's respiratory rate and oxygen saturation is essential for patient safety. A normal respiratory rate for an adult is 12 to 20 breaths per minute.

Choice D rationale

This choice is incorrect because monitoring liver function, blood pressure, and respiratory status are all essential aspects of care for a patient on methadone due to the drug's systemic effects and potential for adverse reactions. Therefore, none of the above is not a correct answer.

Choice A rationale

Aspirin is a non-steroidal anti-inflammatory drug (NSAID) with analgesic properties, but it is not the primary reason for low-dose therapy in coronary artery disease. Aspirin's analgesic effect is achieved at higher doses. The primary goal of low-dose aspirin in this context is its antiplatelet effect, not pain relief, as it does not effectively address the chest pain associated with myocardial ischemia, which is typically managed with vasodilators like nitroglycerin.

Choice B rationale

Aspirin does not have a direct blood pressure-lowering effect. While it can reduce inflammation and vascular resistance in some cases, it is not prescribed as an antihypertensive medication. Angiotensin-converting enzyme (ACE) inhibitors, angiotensin II receptor blockers (ARBs), and beta-blockers are the primary classes of medications used to manage high blood pressure in patients with coronary artery disease.

Choice C rationale

Low-dose aspirin inhibits the production of thromboxane A2 by irreversibly acetylating cyclooxygenase (COX-1) in platelets. Thromboxane A2 is a potent vasoconstrictor and platelet aggregator. By inhibiting its production, aspirin prevents platelets from clumping together, which reduces the risk of clot formation in the coronary arteries and helps prevent myocardial infarction and other cardiovascular events.

Choice D rationale

Aspirin does not significantly reduce cholesterol levels. Statin medications, such as atorvastatin or rosuvastatin, are the class of drugs primarily used to lower cholesterol. They work by inhibiting HMG-CoA reductase, an enzyme involved in cholesterol synthesis in the liver. Aspirin's role is specifically to prevent thrombotic events, not to address the underlying lipid-related pathology.