Objective: We aimed to investigate short term effects of oral and infusion dosages of amiodarone on thyroid function.
Methods: A hundred and fifty-five prospectively consecutive patients with a diagnosis of atrial or ventricular arrhythmias admitted to our clinic whom amiodarone were applied enrolled to our study. 134 patients received 16 mg/kg amiodarone iv infusion for 24 hours and oral 500±100 mg/day amiodarone as the maintenance dose for one month. 21 patients received only oral 500±100 mg/day amiodarone dose for one month. Follow up visit was performed in the first month of amiodarone therapy.
Results: In this study 68% of patients were male and the average age of the patients was 62.8±13.5. The indications for amiodarone treatment were atrial fibrillation (41%), ventricular tachycardia (41%), and preoperative (5%), supraventricular tachycardia (5%), atrial flutter (5%), and ventricular fibrillation (3%). At the first month of follow up 83% of patients were in euthyroid state, 17% of the patients had amiodarone induced thyroid dysfunction (TD), 5% of patients had subclinical hyperthyroidism, 5% of patients had manifest hypothyroidism, 7% of patients had subclinical hyperthyroidism, and 1% of the patients developed overt hyperthyroidism.
Conclusion: In this study we showed that amiodarone can cause adverse effects on thyroid function in a short time of period. For this reason patients should be followed in the first, third, sixth and twelfth months of amiodarone therapy and thyroid function should be evaluated.
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