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| Content Provider | Springer Nature Link |
|---|---|
| Author | Matsukura, Suchitra Nakamura, Yuji Cao, Xin Wada, Takeshi Izumi Nakaseko, Hiroko Ando, Kentaro Sugiyama, Atsushi |
| Copyright Year | 2016 |
| Abstract | Anti-atrial fibrillatory and proarrhythmic potentials of amiodarone were simultaneously analyzed by using the halothane-anesthetized beagle dogs (n = 4) in order to begin to prepare standard protocol for clarifying both efficacy and adverse effects of anti-atrial fibrillatory drugs. Intravenous administration of 0.3 mg/kg of amiodarone hydrochloride decreased the heart rate and mean blood pressure. Additional administration of 3 mg/kg of amiodarone hydrochloride prolonged the QT interval besides the effects observed by the low dose, whereas it showed 1.6 times larger prolongation in the effective refractory period of the atrium than that of the ventricle, which may explain its clinical efficacy against atrial arrhythmias. However, no significant change was detected by either dose in the early repolarization assessed by corrected J–T $_{peak}$ or the late repolarization done by T $_{peak}$–T $_{end}$ in the electrocardiogram, although the former tended to be shortened and the reverse was true for the latter. Lack of prolongation in the early repolarization will make it feasible to better understand why amiodarone lacks proarrhythmic potential in spite of the QT-interval prolongation. Thus, these results of amiodarone obtained by current protocol may become a guidance on assessing efficacy and adverse effects of new anti-atrial fibrillatory drugs in vivo. |
| Starting Page | 157 |
| Ending Page | 162 |
| Page Count | 6 |
| File Format | |
| ISSN | 15307905 |
| Journal | Cardiovascular Toxicology |
| Volume Number | 17 |
| Issue Number | 2 |
| e-ISSN | 15590259 |
| Language | English |
| Publisher | Springer US |
| Publisher Date | 2016-04-04 |
| Publisher Place | New York |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Amiodarone Atrial fibrillation Bepridil Early repolarization Effective refractory period QT interval dl-Sotalol Torsade de pointes Pharmacology/Toxicology Cardiology |
| Content Type | Text |
| Resource Type | Article |
| Subject | Molecular Biology Toxicology Cardiology and Cardiovascular Medicine |
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