- Frequency-dependent electrophysiological effect of ibutilide on human atrium and ventricle. Oshikawa, N., Watanabe, I., Masaki, R., Shindo, A., Kojima, T., Saito, S., Ozawa, Y., Kanmatsuse, K. Journal of interventional cardiac electrophysiology : an international journal of arrhythmias and pacing. (2001)