Which is a cause of DCM that is related to toxins?

Which is a cause of DCM that is related to toxins?

• A. Idiopathic
• B. Toxicity (Alcohol, drugs)
• C. Peripartum
• D. Myocarditis

Answer: (B)

Toxin exposure can cause dilated cardiomyopathy by directly injuring heart muscle cells, leading to cell death, remodeling, chamber dilation, and reduced systolic function. Alcohol is a classic culprit, and various drugs, including certain chemotherapeutic agents, can trigger this pattern. The key idea is that the damage is due to toxic injury from an external substance, not a primary genetic, inflammatory, or postpartum process. Idiopathic is a diagnosis of unknown cause after evaluation, so it isn’t defined by a toxin. Peripartum cardiomyopathy occurs around the time of childbirth and involves hormonal and immunologic factors rather than toxin exposure. Myocarditis is inflammation of the heart muscle often from infection, which can lead to dilated cardiomyopathy secondarily, but it is not categorized by toxin-induced injury.

Toxin exposure can cause dilated cardiomyopathy by directly injuring heart muscle cells, leading to cell death, remodeling, chamber dilation, and reduced systolic function. Alcohol is a classic culprit, and various drugs, including certain chemotherapeutic agents, can trigger this pattern. The key idea is that the damage is due to toxic injury from an external substance, not a primary genetic, inflammatory, or postpartum process.

Idiopathic is a diagnosis of unknown cause after evaluation, so it isn’t defined by a toxin. Peripartum cardiomyopathy occurs around the time of childbirth and involves hormonal and immunologic factors rather than toxin exposure. Myocarditis is inflammation of the heart muscle often from infection, which can lead to dilated cardiomyopathy secondarily, but it is not categorized by toxin-induced injury.