Effects of berberine on delayed afterdepolarizations in ventricular muscles in vitro and in vivo
| Autor: | Yong-Xiao Wang, Yue-Hua Tan, Xiu Juan Yao |
|---|---|
| Rok vydání: | 1994 |
| Předmět: |
Male
medicine.medical_specialty Berberine Heart Ventricles Guinea Pigs Stellate Ganglion chemistry.chemical_element Stimulation Calcium In Vitro Techniques Ouabain chemistry.chemical_compound In vivo Internal medicine Medicine Animals Hypoxia Pharmacology business.industry Depolarization Calcium Gluconate Myocardial Contraction Electrophysiology Endocrinology medicine.anatomical_structure chemistry Stellate ganglion Neuromuscular Depolarizing Agents Injections Intravenous Female Rabbits Cardiology and Cardiovascular Medicine business Anti-Arrhythmia Agents medicine.drug |
| Zdroj: | Journal of cardiovascular pharmacology. 23(5) |
| ISSN: | 0160-2446 |
| Popis: | The effects of berberine on delayed afterdepolarizations in ventricular muscles in vitro and in vivo were investigated to help explain the mechanisms for its antiarrhythmic action. Berberine 3 mumol reduced the amplitude of delayed afterdepolarizations induced by ouabain or posthypoxic reoxygenation and abolished subsequent triggered activity in isolated guinea pig right ventricular papillary muscles. At 30 mumol, it decreased the incidence of delayed afterdepolarizations, associated with a further decrease in the amplitude of delayed afterdepolarizations. In rabbit left ventricular (LV) muscles in vivo, berberine 1 mg/kg intravenously (i.v.) decreased the amplitude of delayed afterdepolarizations evoked by ouabain and calcium gluconate from 9.6 +/- 1.9 to 6.8 +/- 0.8 mV and left stellate ganglion stimulation from 9.4 +/- 2.1 to 6.2 +/- 0.7 mV and blocked ventricular arrhythmias. After a 4-mg/kg i.v. bolus, the drug inhibited and even completely abolished development of delayed afterdepolarizations, yet still reduced maximal velocity of depolarization in isolated and in vivo ventricular muscles. Therefore, one of the important mechanisms for antiarrhythmic action of berberine may be suppression of delayed afterdepolarizations, which may be attributable in part to a decrease in Na+ influx. |
| Databáze: | OpenAIRE |
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