The nurse is performing intake interviews at a psychiatric clinic. A female client with a known history of drug abuse reports that she had a heart attack four years ago. Use of which substance places the client at highest risk for myocardial infarction?

A. Alcohol: Chronic alcohol use is associated with cardiomyopathy, hypertension, and arrhythmias such as atrial fibrillation. While excessive intake can contribute to long-term cardiovascular disease, it is less commonly linked to acute coronary vasospasm leading directly to myocardial infarction in younger individuals. B. Benzodiazepine: Benzodiazepines are central nervous system depressants that primarily enhance gamma-aminobutyric acid (GABA) activity, producing sedation and anxiolysis. They do not typically increase sympathetic output or cause significant vasoconstriction. Cardiovascular effects are usually mild, such as slight hypotension, rather than acute coronary ischemia. C. Marijuana: Marijuana can cause transient tachycardia and mild increases in blood pressure due to sympathetic stimulation. Although there is increased myocardial oxygen demand shortly after use, the association with myocardial infarction is less pronounced compared to potent stimulants. The cardiovascular effects are generally less intense and shorter in duration. D. Methamphetamine: Methamphetamine is a potent central nervous system stimulant that markedly increases the release of norepinephrine, dopamine, and epinephrine. This leads to intense vasoconstriction, hypertension, tachycardia, and increased myocardial oxygen demand. Coronary artery vasospasm and accelerated atherosclerosis significantly elevate the risk of acute myocardial infarction, even in young individuals without traditional cardiac risk factors.