Electrophysiological study on the antiarrhythmic mechanism of ampelopsin in rats / 中华心血管病杂志

<p><b>OBJECTIVE</b>To explore the antiarrhythmic mechanism of ampelopsin through electrophysiological study in rats.</p><p><b>METHODS</b>The in vivo experimental groups were as follows:control group, low-dose, middle-dose and high-dose group. Arrhythmia in rats was induced by aconitine injection, and then the antiarrhythmic effects of ampelopsin were studied. Cardiomyocytes were isolated from rats therafter. The whole-cell patch-clamp technique was used to record action potential duration (APD), sodium currents (INa), calcium current (ICa), transient outward potassium currents (Ito) and inward rectifier potassium currents (IK1) in cardiomyocytes.</p><p><b>RESULTS</b>In vivo experiments showed that the incidence of aconitine-induced experimental arrhythmias in low, middle and high-dose ampelopsin group was significantly lower than that in control group (n = 5 each group, all P < 0.05). In vitro whole-cell patch clamp experiments showed that action potential duration in low, middle and high-dose groups was significantly shorter than that in control group, and amplitude of action potential was also significantly lower in low, middle and high-dose ampelopsin groups than in control group (134.1 ± 6.9), (120.1 ± 7.4), (113.2 ± 9.0), and (101.8 ± 5.1) mV for control, low, middle and high-dose group (n = 9 each group, all P < 0.05).Further research revealed that sodium currents in cardiomyocytes were decreased by low, middle and high-dose ampelopsin from (-36.75 ± 3.60) to (-31.03 ± 2.61), (-26.63 ± 3.72), and (-17.55 ± 4.43) pA/pF (n = 9 each group, all P < 0.05), but the activation voltage for peak potential was not affected by ampelopsin. Moreover, the inward rectifier potassium current was also higher in high-dose ampelopsin group than in control group (P < 0.05). Calcium current and transient outward potassium current were similar among four groups.</p><p><b>CONCLUSION</b>Ampelopsin exerts anti-arrhythmic effects in this rat model, and the underlying electrophysiological mechanism is partly associated with the inhibition of INa and enhancement of IK1, and prolongation of APD.</p>

Detection of Insoluble Particles in Compound Kushen Injection Mixed with 4 Infusion Solution / 中国药房

OBJECTIVE:To investigate the infusion solutions which are compatible with Compound kushen injection. METHODS:The insoluble particles of kushen injection in four kinds of infusion solutions were detected respectively by light blockage method.RESULTS:Insoluble particles of different size and number were noted for Compound kushen injection when mixed respectively with four kinds of infusion solutions,but the insoluble particles in all kinds of infusion solutions except 10% glucose injection were all within the range specified in China Pharmacopeia(2005 edition).CONCLUSION: 0.9% sodium ch-loride injection is the optimal compatible infusion solution for Compound kushen injection.