400中的200？

Subsequent to these earlier studies, McClain et al. [15] performed a case-controlled study of 200 patients undergoing lumbar surgery, treated with spinal or general anesthesia. A total of 400 patients were matched for anesthetic class, preoperative diagnosis, surgical procedure, and perioperative protocols. All patients were treated according to protocol and recovered in the same PACU. For patients receiving spinal anesthesia for lumbar spine surgery, overall complication rates and time to discharge were lower. For patients receiving GA, total anesthetic and operative times were longer, and perioperative HR and MAP were elevated compared to patients receiving spinal. PONV and antiemetic use and urinary retention were increased among GA patients as well. Spinal patients interestingly had fewer headaches compared with GA patients, but this was not statistically significant. Authors concluded that for patients undergoing decompressive lumbar spine surgery, spinal was at least comparable to GA with respect to complications, but had major advantages in the perioperative setting.

在这些早期研究后，McClain等人对200例腰椎手术患者，使用脊髓麻醉或全身麻醉进行了一项病例对照研究[15]。共对400名患者根据麻醉分级、术前诊断、手术方法和围手术期治疗进行匹配，选出200名匹配患者。所有患者均按照治疗方案治疗，并在同一PACU中复苏。脊髓麻醉的腰椎手术患者，总体并发症发生率较低且出院时间较短。全身麻醉的患者，总麻醉时间和手术时间较长，围手术期心率和平均动脉压较脊髓麻醉的患者有明显升高，PONV、止吐药物使用和尿潴留发生率也有所增加。有趣的是，脊髓麻醉患者的头痛发生率比 GA 患者少，但无统计学意义。作者得出结论，对腰椎减压手术的患者，在并发症方面脊髓麻醉至少与GA相当，但在围术期有许多优势。

一会儿200，一会儿400，是400中的200？谢谢