简介：AIM:Tofindasimplemathematicalcorrelationbetweenthelensbasecurve(BC)andkeratometryfindings(krf).METHODS:Thisretrospectivestudyincluded400keratoconiceyes(350patients)previouslyfitwithrigidcontactlensesatanacademiceyecenteroverafiveyearperiod.Thepatientswereclassifiedintofivegroupsbasedonthekeratometryfindings(krf<7,krf:7-8,krf>8,krf-krs(differencebetweentwokeratometry;flatandsteep)=0.3-0.6,krf-krs>0.6mmasgroups1to5,respectively.MultivariatelinearregressionandMunro’scorrelationcoefficientwereemployedtodefertheformulas.RESULTS:Alinearcorrelationcouldbefoundinallgroupsexceptforpatientsingroup3.Forgroup1,BC=0.211×krf+5.904.Forgroup2,BC=0.456×krf+4.160.Forgroup4,BC=0.321×krf+5.219.Forgroup5,BC=0.337×krf+5.090.CONCLUSION:ThedevelopmentofnewformulasforRGPfittingenablesophthalmologiststoworkwithconfidenceandpreventsunnecessaryandfrequentlenstrials.Thecustomarylensfittingmethodsareneededtobereplacedbynewformulas,whichhelptosavetimeandcosts.

简介：<正>经咽喉部的各种插管操作如气管插管、食管镜检查、食管异物取出、插胃管等,如操作方法不当,易引起环杓关节脱位,若被误诊、漏诊,不及时治疗,可导致永久性声音嘶哑。自1994年1月以来,我们治疗了此类患者13例,现报告如下: