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Vernakalant (INN; codenamed RSD1235, proposed tradenames Kynapid and Brinavess) is an investigational drug under regulatory review for the acute conversion of atrial fibrillation. It was initially developed by Cardiome Pharma, and the intravenous formulation was bought for further development by Merck in April 2009. In September 2012, Merck terminated its agreements with Cardiome and has consequently returned all rights of the drug back to Cardiome. On 11 December 2007, the Cardiovascular and Renal Drugs Advisory Committee of the US Food and Drug Administration (FDA) voted to recommend the approval of vernakalant,〔(【引用サイトリンク】title=FDA Advisory Committee Recommends Approval of Kynapid for Acute Atrial Fibrillation )〕 but in August 2008 the FDA judged that additional information was necessary for approval.〔 The drug (under brand name Brinavess) was approved in Europe on 1 September 2010. An oral formulation underwent Phase II clinical trials between 2005 and 2008. ==Mechanism of action== Like other class III antiarrhythmics, vernakalant blocks atrial potassium channels, thereby prolonging repolarization. It differs from typical class III agents by blocking a certain type of potassium channel, the cardiac transient outward potassium current, with increased potency as the heart rate increases. This means that it is more effective at high heart rates, while other class III agents tend to lose effectiveness under these circumstances. It also slightly blocks the hERG potassium channel, leading to a prolonged QT interval. This may theoretically increase the risk of ventricular tachycardia, though this does not seem to be clinically relevant. The drug also blocks atrial sodium channels.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Vernakalant」の詳細全文を読む スポンサード リンク
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