氯胺酮对大鼠心肌细胞钙离子移动的影响

目的研究不同浓度氯胺酮对KCl诱发的大鼠心肌细胞钙离子移动的影响，探讨其对心肌收缩力的作用。方法用Fluo-3AM钙荧光指示剂染色急性分离的大鼠心肌细胞，在激光共聚焦显微镜下动态测定用药前和使用浓度为1×10

Effects of Ketamine on Ca 2 Transsarcolemmal Influx in Isolated Rat Ventricular Mycocytes

Purpose To investigate the effects of different concentration of ketamine on Ca2 transsarcolemmalinflux induced by KCl in isolated rat ventricular myocytes. Methods Freshly isolated rat ventricular nyoeyteswere loaded with Fluo-3AM, a Ca2 + indicator. The effects of different concentration ketamine( 1 × 10- s, 1 × 10- 4,1 × 10-3 mmol/L) on the change of intracellular Ca2+ concentration induced by KCl were investigated. Results Low concentration ketamine(1 × 10-5 mrnol/L) did not change Ca2+ transsarcolemmal influx. Although mediumeoncentration ketamine( 1 × 10-4 rmol/L) made the influx slower, the eventual peak concentration of intracellularCa2+ had no difference from that of the control group. The high concentration ketamine (1 × 10-3 mmol/L) inhibited Ca2-1 influx,intracellular Ca2+ fluorescent intensity decreased about 13.2% (P＜0.05). ConclusionsKetamine inhibits Ca2 + trranssarcolemmal influx in isolated rat ventricular myocytes dosedependently, which may inpart explain its negative inotropic effect.