alexa Frequent premature ventricular contractions induced by itraconazole.
Medicine

Medicine

Internal Medicine: Open Access

Author(s): Okamoto J, Fukunami M, Kioka H

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Abstract Itraconazole is widely used to treat onychomycosis because of its significant therapeutic effects. An otherwise healthy 30-year-old man treated with itraconazole developed frequent premature ventricular contractions (PVC). He presented with a dry cough and palpitation. The results of 12-lead electrocardiography (ECG) were essentially normal, but Holter ECG revealed 17,484 (18\%) uniform PVC, including 4 short runs among 96,930 beats/day. Another Holter ECG after withdrawing itraconazole revealed 1,032 premature atrial contractions but no PVC. The corrected QT interval was 0.39 s without itraconazole, 0.41 s with itraconazole, and 0.43 s when multiple PVC were documented. Itraconazole inhibits the fungal cytochrome P450 that is involved in fungal cell membrane formation, interrupts human cytochrome P450A4 in the liver and causes adverse interactions with various drugs such as antiarrythmics, but its cardiac side-effects are obscure. Both patients and physicians should be aware that itraconazole can cause PVC as a side-effect.
This article was published in Circ J and referenced in Internal Medicine: Open Access

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