Which of the following is not an adverse effect of chronic amiodarone therapy ?
**Core Concept**
Chronic amiodarone therapy can cause a range of adverse effects due to its high iodine content and lipophilic nature, affecting multiple organ systems. Amiodarone is a complex antiarrhythmic medication with a narrow therapeutic index, necessitating careful monitoring for potential side effects.
**Why the Correct Answer is Right**
Systemic lupus erythematosus (SLE) is a chronic autoimmune disease that can affect multiple organs. While amiodarone can induce various autoimmune phenomena, such as lupus-like syndrome, this is typically seen in the context of a drug-induced lupus erythematosus, which is a distinct entity from idiopathic SLE. The pathophysiology of drug-induced lupus is thought to involve the formation of immune complexes, but it is less severe and less commonly associated with amiodarone compared to other medications.
**Why Each Wrong Option is Incorrect**
**Option A:** Pulmonary fibrosis is a well-documented adverse effect of chronic amiodarone therapy, thought to result from the deposition of amiodarone lipids in lung tissue, leading to inflammation and fibrosis.
**Option B:** Hypothyroidism is a common adverse effect of amiodarone, resulting from its high iodine content, which can lead to thyroid gland dysfunction and decreased thyroid hormone production.
**Option C:** Hyperthyroidism is also a potential adverse effect of amiodarone, particularly in patients with pre-existing thyroid disease, due to its high iodine content, which can stimulate the thyroid gland and lead to an overproduction of thyroid hormones.
**Clinical Pearl / High-Yield Fact**
Amiodarone-induced thyroid dysfunction is a classic exam trap, and students should remember that both hypothyroidism and hyperthyroidism can occur, often presenting with non-specific symptoms. Thyroid function tests should be monitored regularly in patients on long-term amiodarone therapy.
**Correct Answer:**
β Correct Answer: D. Systemic lupus erythematosus.