Effectiveness of cone-beam CT by measuring tongue thickness in predicting difficult glottis exposure
Objective To investigate the accuracy of cone-beam CT(CBCT)by measuring tongue thickness(TT)in predicting difficult glottis exposure in patients undergoing maxillofacial surgery.Methods Ninety-seven patients undergoing elective maxillofacial surgery under general anesthesia were selected,45 males and 52 females,aged 18-67 years,ASA physical status Ⅰ or Ⅱ.The TT was measured by CBCT before operation.The inter-incisor distance(IID),BMI,thyromental distance(TMD),and modified Mal-lampati test(MMT)were also recorded.According to the Cormack-Lehane(CL)grade at the time of gener-al anesthesia induction,the patients were divided into two groups:the easy laryngoscope exposure group(group E,CL gradeⅠorⅡ,n = 86)and the difficult laryngoscope exposure group(group D,CL gradeⅢ or Ⅳ,n = 11).The relationship between IID,BMI,TMD,MMT,TT,and laryngoscopy exposure was analyzed,and the receiver operating characteristic(ROC)curve was used to analyze the relationship be-tween each index and difficult laryngoscopy exposure.Results Compared with group E,the BMI,MMT,and TT of group D were significantly increased(P＜0.05),while the TMD was significantly decreased(P＜0.05).The area under the ROC curve(AUC)of BMI,TMD,MMT,and TT to predict difficult glot-tis exposure was 0.690,0.714,0.726,and 0.797,the sensitivity was 36.4%,63.6%,63.6%,and 81.8%,and the specificity was 95.3%,69.8%,76.7%,and 68.6%,respectively.Using BMI,MMT,TMD,and TT as a model to predict difficult glottis exposure,the AUC was 0.913,the sensitivity was 90.9%and the specificity was 83.7%.Conclusion TT measured by CBCT is an independent impact factor for predicting difficult laryngoscope exposure.The comprehensive model incorporating BMI,TMD,MMT,and TT has a better predictive effect.
NETL
NSTL
万方数据
维普
