Effects of NMDA Receptor Antagonist Ketamine on Implicit Memory<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /> Abstract Objective:To study the effect of ketamine on patients retrograde amnesia and implicit memory. Methods:45 patients, ASA Ⅰ~Ⅱ degree, 30~55 years old, were selectively choosen to be underwent lower limb operations under epidural anaesthesia. The different bolus dosages of ketamine were given in operation. The patients were randomly divided into 3 groups, each group including 15 cases. Ketamine 25 mg, ketamine 50 mg and placebo were injected introvenously in group Ⅰ,Ⅱ and Ⅲ respectively. ECG, BP, HR, SpO2, RR and BIS, SEF 95% were monitored. The retrogade amnesia was investigated after the patients came to themselves from ketamine used. The data of muddy identified hearing rate was collected to analyse the effect on implicit memory 8 hours after ketamine was given. Results:After ketamine was given, the BP and HR were higher than basetine (P<0.05=. All patients could remember the events occured before ketamine was given. There was no significant difference in the muddy identified hearing rate between group Ⅰ, group Ⅱ and group Ⅲ. Conclusion:After different bolus dosages of ketamine were given, there were no retrograde amnesia and no effect on patient's implicit memory. Key words:NMDA receptor; Antagonist; Ketamine; Implicit memory; Retrograde amnesia 研究表明NMDA受体与记忆有关[1]。氯胺酮作为NMDA受体拮抗药,与疼痛有密切关系,但是否对患者产生逆行性遗忘及内隐记忆影响,尚未见报道。本研究拟通过单次静脉注射NMDA受体拮抗药氯胺酮,观察其对逆行性遗忘和内隐记忆的影响。 资料和方法 选择45例ASAⅠ~Ⅱ级、无精神异常、无记忆障碍、无脑血管疾病和颅内占位病变的择期下肢手术患者,年龄44.0±8.4岁,身高161.0±6.3 cm,体重64.0±5.6 kg,随机均分为三组。硬膜外麻醉成功后,手术中静脉注射单次剂量氯胺酮25 mg(Ⅰ组)、50 mg(Ⅱ组)或空白对照(Ⅲ组)。术中常规监测ECG、BP、HR、SpO2和RR;用美国 Aspect A-1000脑电监护仪监测双频谱指数(BIS)和95%谱边界频率(SEF95%)。记忆调查:在注射氯胺酮前,给患者讲两句相同的话,待患者意识完全恢复正常后,了解患者对两句话有无逆行性遗忘的情况。内隐记忆调查:术后8 h通过模糊辨听率的调查方法[2],判断药物作用消失后是否存在内隐记忆影响。统计学处理:采用第四军医大学统计学教研室开发的SPLM统计软件包进行处理。组间采用独立样本t检验,P<0.05认为有显著性差异。 |