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Amiodarone-induced pulmonary toxicity mimicking metastatic lung disease
P Patel1, D Honeybourne, R D Watson
1Department of Respiratory Medicine, Dudley Road Hospital, Birmingham, UK.
Abstract:
A 65 year old man developed atrial arrhythmias secondary to a congestive cardiomyopathy which were resistant to quinidine and disopyramide. Amiodarone controlled the paroxysmal atrial tachycardia but 4 months after starting the drug he developed increasing dyspnoea and radiological changes highly suggestive of metastatic lung disease. Lung biopsy showed change of drug-induced pneumonitis and 4 months after stopping amiodarone his symptoms resolved and the chest X-ray had cleared. Amiodarone may cause pulmonary toxicity mimicking metastatic lung disease.
Insights
Amiodarone, used for atrial arrhythmias, can cause lung toxicity that mimics cancer. This drug-induced pneumonitis resolved after discontinuing amiodarone, highlighting its potential pulmonary side effects.
Area of Science:
- Cardiology
- Pulmonology
- Pharmacology
Background:
- Congestive cardiomyopathy can lead to atrial arrhythmias resistant to standard treatments.
- Amiodarone is an antiarrhythmic drug often used for refractory arrhythmias.
Observation:
- A 65-year-old man with drug-resistant atrial arrhythmias received amiodarone.
- After four months, he presented with dyspnea and radiological findings suggestive of metastatic lung disease.
Findings:
- Lung biopsy confirmed drug-induced pneumonitis, not metastatic disease.
- Symptoms and radiological findings resolved within four months of amiodarone discontinuation.
Implications:
- Amiodarone can induce pulmonary toxicity that closely resembles metastatic lung disease.
- Clinicians should consider amiodarone-induced pneumonitis in patients on the drug presenting with respiratory symptoms and suspicious lung imaging.
- Early recognition and cessation of amiodarone are crucial for managing this adverse effect.