Vernakalant (RSD1235) in the management of atrial fibrillation: a review of pharmacological properties, clinical efficacy and safety
Abstract
Vernakalant (RSD1235) is a novel antiarrhythmic agent for conversion of rapid onset atrial fibrillation (AF). It is an atria-selective multichannel ion blocker (blocks IKur, INa, ICa, L, Ito and IKr), with a small effect on ventricular repolarization. In clinical Phase II and III studies, vernakalant was moderately (∼50%) effective in converting AF of short duration (< 7 days), and effective (∼70–80%) in converting AF of less than 72 h, but was not effective in converting long duration AF (>7 days) or atrial flutter. Vernakalant seems to have only a small proarrhythmic effect, with no reported cases of torsades de pointes in direct relation to vernakalant administration in Phase II and III studies. Overall, there are few reported serious adverse events.
Papers of special note have been highlighted as: ▪ of interest ▪▪ of considerable interest
Bibliography
- 1 Benjamin EJ, Wolf PA, D’Agostino RB, Silbershatz H, Kannel WB, Levy D: Impact of atrial fibrillation on the risk of death: the Framingham Heart Study. Circulation98(10),946–952 (1998).
- 2 Kannel WB, Wolf PA, Benjamin EJ, Levy D: Prevalence, incidence, prognosis, and predisposing conditions for atrial fibrillation: population-based estimates. Am. J. Cardiol.82(8A),N2–N9 (1998).
- 3 Slavik RS, Tisdale JE, Borzak S: Pharmacologic conversion of atrial fibrillation: a systematic review of available evidence. Prog. Cardiovasc. Dis.44(2),121–152 (2001).
- 4 Go AS, Hylek EM, Phillips KA et al.: Prevalence of diagnosed atrial fibrillation in adults: national implications for rhythm management and stroke prevention: the AnTicoagulation and Risk Factors in Atrial Fibrillation (ATRIA) Study. JAMA285(18),2370–2375 (2001).
- 5 Miyasaka Y, Barnes ME, Gersh BJ et al.: Secular trends in incidence of atrial fibrillation in Olmsted County, Minnesota, 1980 to 2000, and implications on the projections for future prevalence. Circulation114(2),119–125 (2006).
- 6 Mittal S, Stein KM, Markowitz SM, Iwai S, Guttigoli A, Lerman BB: An update on electrical cardioversion of atrial fibrillation. Card. Electrophysiol. Rev.7(3),285–289 (2003).
- 7 Gurevitz OT, Ammash NM, Malouf JF et al.: Comparative efficacy of monophasic and biphasic waveforms for transthoracic cardioversion of atrial fibrillation and atrial flutter. Am. Heart J.149(2),316–321 (2005).
- 8 Gall NP, Murgatroyd FD: Electrical cardioversion for AF-the state of the art. Pacing Clin. Electrophysiol.30(4),554–567 (2007).
- 9 Nerbonne JM, Kass RS: Molecular physiology of cardiac repolarization. Physiol. Rev.85(4),1205–1253 (2005).
- 10 Fedida D, Orth PM, Chen JY et al.: The mechanism of atrial antiarrhythmic action of RSD1235. J. Cardiovasc. Electrophysiol.16(11),1227–1238 (2005).▪ Reviews mechanistic properties of vernakalant.
- 11 Fedida D: Vernakalant (RSD1235): a novel, atrial-selective antifibrillatory agent. Expert Opin Investig. Drugs16(4),519–532 (2007).▪ Mechanism of action of vernakalant.
- 12 Savelieva I, Camm J: Anti-arrhythmic drug therapy for atrial fibrillation: current anti-arrhythmic drugs, investigational agents, and innovative approaches. Europace10(6),647–665 (2008).
- 13 Camm AJ, Savelieva I: New antiarrhythmic drugs for atrial fibrillation: focus on dronedarone and vernakalant. J. Interv. Card. Electrophysiol. (2008) (Epub ahead of print).
- 14 Roy D, Talajic M, Nattel S et al.: Rhythm control versus rate control for atrial fibrillation and heart failure. N. Engl. J. Med.358(25),2667–2677 (2008).
- 15 Roy D, Rowe BH, Stiell IG et al.: A randomized, controlled trial of RSD1235, a novel anti-arrhythmic agent, in the treatment of recent onset atrial fibrillation. J. Am. Coll. Cardiol.44(12),2355–2361 (2004).▪▪ Controlled Randomized Atrial Fibrillation Trial (CRAFT) – a clinical Phase II study.
- 16 Eldstrom J, Wang Z, Xu H et al.: The molecular basis of high-affinity binding of the antiarrhythmic compound vernakalant (RSD1235) to Kv1.5 channels. Mol. Pharmacol.72(6),1522–1534 (2007).
- 17 Brendel J, Peukert S: Blockers of the Kv1.5 channel for the treatment of atrial arrhythmias. Curr. Med. Chem. Cardiovasc. Hematol. Agents1(3),273–287 (2003).
- 18 Vernakalant: RSD 1235, RSD-1235, RSD1235. Drugs RD, 8(4),259–265 (2007).
- 19 Naccarelli GV, Wolbrette DL, Samii S et al.: Vernakalant – a promising therapy for conversion of recent-onset atrial fibrillation. Expert Opin Investig. Drugs17(5),805–810 (2008).
- 20 Orth PM, Hesketh JC, Mak CK et al.: RSD1235 blocks late INa and suppresses early afterdepolarizations and torsades de pointes induced by class III agents. Cardiovasc. Res.70(3),486–496 (2006).
- 21 Cheng JW: Vernakalant in the management of atrial fibrillation. Ann. Pharmacother.42(4),533–542 (2008).
- 22 Naccarelli GV, Wolbrette DL, Samii S, Banchs JE, Penny-Peterson E, Gonzalez MD: New antiarrhythmic treatment of atrial fibrillation. Expert Rev. Cardiovasc. Ther.5(4),707–714 (2007).
- 23 Dorian P, Pinter A, Mangat I, Korley V, Cvitkovic SS, Beatch GN: The effect of vernakalant (RSD1235), an investigational antiarrhythmic agent, on atrial electrophysiology in humans. J. Cardiovasc. Pharmacol.50(1),35–40 (2007).▪▪ Examining the electrophysiological properties of vernakalant in humans.
- 24 Roy D, Pratt CM, Torp-Pedersen C et al.: Vernakalant hydrochloride for rapid conversion of atrial fibrillation: a phase 3, randomized, placebo-controlled trial. Circulation117(12),1518–1525 (2008).▪▪ Atria arrhythmic conversion trial (ACT) 1 – a clinical Phase III study.
- 25 Kowey PR, Roy D, Pratt CM et al.: Efficacy and safety of vernakalant: efficacy and safety of vernakalant hydrochloride injection for the treatment of atrial fibrillation after valvular or coronary artery bypass surgery. Circulation116,II636–II637 (2007).
- 26 Roy D, Pratt C, Camm AJ, Grant S, Kitt TM, Mangal B: RSD1235 effectively converts acute atrial fibrillation to sinus rhythm independent of background use of oral rateor rhythm-control medications. Ann. Emerg. Med.48 (Suppl.),S46 (2006) (Abstract 148).
- 101 Astellas Pharma US, Inc., Kynapid, vernakalant hydrochloride injection. NDA 22–034. www.fda.gov/ohrms/dockets/ac/07/briefing/2007–4327b1–01-astellas-backgrounder.pdf.
- 102 Cardiome Pharma Corp. Vernakalant (oral). www.cardiome.com/VernakalantOral.php
- 103 Cardiome Pharma Corp. Vernakalant. http://cardiome.com/wordpress/?p=443
- 104 Cardiome Pharma Corp. Vernakalant (intravenous). www.cardiome.com/VernakalantIntravenous.php
- 105 FDA advisory committee recommends approval of Kynapid for acute atrial fibrillation. www.astellas.us/press_room/docs/071211%20-%20FDA%20Panel%20Vote%20-%20FINAL.pdf