Effects of Azimilide on Heart Rate and ECG Conduction Intervals during Sinus Rhythm in Patients with a History of Atrial Fibrillation

The purpose of this study was to assess the effect of azimilide, a Class III antiarrhythmic drug, on ECG conduction intervals recorded during sinus rhythm in patients with a history of symptomatic atrial fibrillation or atrial flutter. In Phase I clinical pharmacology studies, azimilide was associat...

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Veröffentlicht in:Journal of clinical pharmacology 2002-04, Vol.42 (4), p.388-394
Hauptverfasser: Pritchett, Edward L. C., Schulte, Marcia C., Schnell, Daniel, Marcello, Stephen R., Wilkinson, William E., Page, Richard L., Connolly, Stuart J.
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container_issue 4
container_start_page 388
container_title Journal of clinical pharmacology
container_volume 42
creator Pritchett, Edward L. C.
Schulte, Marcia C.
Schnell, Daniel
Marcello, Stephen R.
Wilkinson, William E.
Page, Richard L.
Connolly, Stuart J.
description The purpose of this study was to assess the effect of azimilide, a Class III antiarrhythmic drug, on ECG conduction intervals recorded during sinus rhythm in patients with a history of symptomatic atrial fibrillation or atrial flutter. In Phase I clinical pharmacology studies, azimilide was associated with prolongation of the QT and QTc intervals on electrocardiograms recorded during sinus rhythm in normal subjects, but the effect of azimilide on the target population of patients with atrial fibrillation has not been reported in detail previously. Patients with a history of atrial fibrillation, atrial flutter, or both were randomly assigned to receive placebo or azimilide twice daily for 3 days and then qd thereafter. Azimilide doses of 50 mg, 100 mg, or 125 mg were tested. The RR, PR, QRS, QT, QTc(Bazett), and QTc(Fridericia) intervals were measured from electrocardiograms recorded at baseline and on Day 4 of test therapy. Increasing azimilide doses were associated with significant increases in the RR, QT, QTc(Bazett), and QTc(Fridericia) compared with changes in the placebo group based on the F‐test for differences among treatment groups and the test for a dose response. In the azimilide 125 mg dose group, the mean change in RR was significantly greater than the mean change in the placebo group (+61.4 ms in the azimilide 125 mg group vs. −14.1 ms in the placebo group). The mean change in QT was significantly greater in the azimilide 125 mg group than the mean change in the placebo group (+44.2 ms in the azimilide 125 mg group vs. −1.0 ms in the placebo group). The mean change in QTc using both correction methods was significantly greater in the azimilide 125 mg group than the mean change in the respective placebo group: QTc(Bazett) +31.6 ms in the azimilide 125 mg group versus +2.1 ms in the placebo group and QTc(Fridericia) +35.8 in the azimilide 125 mg group versus +1.0 ms in the placebo group. It was concluded that in patients with a history of atrial fibrillation or flutter, azimilide was associated with statistically significant increases in RR, QT, QTc(Bazett), and QTc(Fridericia) when patients were in sinus rhythm.
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Patients with a history of atrial fibrillation, atrial flutter, or both were randomly assigned to receive placebo or azimilide twice daily for 3 days and then qd thereafter. Azimilide doses of 50 mg, 100 mg, or 125 mg were tested. The RR, PR, QRS, QT, QTc(Bazett), and QTc(Fridericia) intervals were measured from electrocardiograms recorded at baseline and on Day 4 of test therapy. Increasing azimilide doses were associated with significant increases in the RR, QT, QTc(Bazett), and QTc(Fridericia) compared with changes in the placebo group based on the F‐test for differences among treatment groups and the test for a dose response. In the azimilide 125 mg dose group, the mean change in RR was significantly greater than the mean change in the placebo group (+61.4 ms in the azimilide 125 mg group vs. −14.1 ms in the placebo group). The mean change in QT was significantly greater in the azimilide 125 mg group than the mean change in the placebo group (+44.2 ms in the azimilide 125 mg group vs. −1.0 ms in the placebo group). The mean change in QTc using both correction methods was significantly greater in the azimilide 125 mg group than the mean change in the respective placebo group: QTc(Bazett) +31.6 ms in the azimilide 125 mg group versus +2.1 ms in the placebo group and QTc(Fridericia) +35.8 in the azimilide 125 mg group versus +1.0 ms in the placebo group. 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C.</creatorcontrib><creatorcontrib>Schulte, Marcia C.</creatorcontrib><creatorcontrib>Schnell, Daniel</creatorcontrib><creatorcontrib>Marcello, Stephen R.</creatorcontrib><creatorcontrib>Wilkinson, William E.</creatorcontrib><creatorcontrib>Page, Richard L.</creatorcontrib><creatorcontrib>Connolly, Stuart J.</creatorcontrib><creatorcontrib>Azimilide Supraventricular Arrhythmia Program 3 (SVA-3) Investigators</creatorcontrib><title>Effects of Azimilide on Heart Rate and ECG Conduction Intervals during Sinus Rhythm in Patients with a History of Atrial Fibrillation</title><title>Journal of clinical pharmacology</title><addtitle>J Clin Pharmacol</addtitle><description>The purpose of this study was to assess the effect of azimilide, a Class III antiarrhythmic drug, on ECG conduction intervals recorded during sinus rhythm in patients with a history of symptomatic atrial fibrillation or atrial flutter. 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In Phase I clinical pharmacology studies, azimilide was associated with prolongation of the QT and QTc intervals on electrocardiograms recorded during sinus rhythm in normal subjects, but the effect of azimilide on the target population of patients with atrial fibrillation has not been reported in detail previously. Patients with a history of atrial fibrillation, atrial flutter, or both were randomly assigned to receive placebo or azimilide twice daily for 3 days and then qd thereafter. Azimilide doses of 50 mg, 100 mg, or 125 mg were tested. The RR, PR, QRS, QT, QTc(Bazett), and QTc(Fridericia) intervals were measured from electrocardiograms recorded at baseline and on Day 4 of test therapy. Increasing azimilide doses were associated with significant increases in the RR, QT, QTc(Bazett), and QTc(Fridericia) compared with changes in the placebo group based on the F‐test for differences among treatment groups and the test for a dose response. 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It was concluded that in patients with a history of atrial fibrillation or flutter, azimilide was associated with statistically significant increases in RR, QT, QTc(Bazett), and QTc(Fridericia) when patients were in sinus rhythm.</abstract><cop>Oxford, UK</cop><pub>Blackwell Publishing Ltd</pub><pmid>11936563</pmid><doi>10.1177/00912700222011436</doi><tpages>7</tpages></addata></record>
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subjects Analysis of Variance
Anti-Arrhythmia Agents - pharmacology
Anti-Arrhythmia Agents - therapeutic use
Antiarythmic agents
Arrhythmia, Sinus - drug therapy
Arrhythmia, Sinus - physiopathology
Atrial Fibrillation - drug therapy
Atrial Fibrillation - physiopathology
Biological and medical sciences
Cardiovascular system
Dose-Response Relationship, Drug
Double-Blind Method
Electrocardiography - drug effects
Female
Heart Rate - drug effects
Heart Rate - physiology
Humans
Hydantoins
Imidazoles - pharmacology
Imidazoles - therapeutic use
Imidazolidines
Male
Medical sciences
Pharmacology. Drug treatments
Piperazines - pharmacology
Piperazines - therapeutic use
title Effects of Azimilide on Heart Rate and ECG Conduction Intervals during Sinus Rhythm in Patients with a History of Atrial Fibrillation
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