MGFA分型及QMG评分预测重症肌无力患者术后延迟拔管的价值

目的探讨美国重症肌无力协会基于定量测试的临床分型((MGFA分型)及定量评分(QMG评分)对重症肌无力(MG)患者胸腺切除术后延迟拔管的预测价值。方法以我院2007年1月至2012年2月确诊为MG行胸骨正中切口胸腺切除手术的61例患者为研究对象,根据术后情况分为正常拔管组(47例)和延迟拔管组(14例),比较两组性别、年龄、术前MGFA临床分型、QMG评分、肝肾功能、电解质、术前新斯的明及强的松用量等情况。绘制术前MGFA分型及QMG评分的受试者工作特征(ROC)曲线,计算QMG评分的最佳临界值,同时对MGFA分型及QMG评分预测术后延迟拔管的敏感度与特异度进行比较。结果延迟拔管组(14例)在术毕麻醉苏醒后需呼吸支持或拔管后48h内再次插管,延迟拔管率为22.95%。MGFA分型、QMG评分预测术后延迟拔管的ROC曲线下面积(AUC)分别为0.723、0.866,以QMG评分8.5为阈值,预测延迟拔管的灵敏度为78.6%,特异度为87.2%,而MGFA分型预测的灵敏度为78.5%,特异度为63.8%。结论术前MGFA分型、QMG评分可作为术后延迟拔管的预测指标。

Clinical value of MGFA classification and QMG score on predicting late extubation after thymectomy in patients with myasthenia gravis

Objective To evaluate clinical value of MGFA classification and QMG score on pre-dicting late extubation after thymectomy for myasthenia gravis(MG).Methods Total of 61 patients with MG received extended thymectomy from January 2007 to February 2012 were enrolled.Patients were divided into two groups:normal extubation group contained the other 47 patients without pro-longed postoperative mechanical ventilation and delayed extubation group included 14 patients with prolonged postoperative mechanical ventilation.The following factors were evaluated:gender,age, weight,MGFA classification,QMG score,history of steroid hormones or anticholinesterase drugs be-fore operation,the function of liver and kidney before operation,preoperative electrolyte,preoperative hemoglobin content,etc.Receiver operator characteristic curve (ROC)was plotted,and the predictive value, sensitivity and specificity of preoperative MGFA clinical classification and QMG score predicting postoperative ventilation in MG were calculated.Results Fourteen patients(22.95%)de-veloped breathing support after the anaesthetic or endotracheal intubation again in 48 hours.the area under ROC curve(AUC)for preoperative MGFA clinical classification predicting postoperative ventila-tion was 0.723 in MG,it had the sensitivity of 78.5% and specificity of 63.8%.The AUC for QMG score predicting postoperative ventilation was 0.866,the QMG score threshold value of 8.5 had the sensitivity of 78.6% and specificity of 87.2%.Conclusion MGFA classification and QMG score can predict late extubation after thymectomy in patients with myasthenia gravis.