简介:摘要混凝土温度裂缝主要是由于混凝土内外温差形成的温度应力所导致的,温变化时混凝土内部物理参数变化而产生了温度应力导致裂缝,本文重点阐述了温度裂缝产生的原因以及在防止裂缝生成或解决裂缝的一些方法。
简介:目的:探讨肛裂缝切术治疗陈旧性肛裂的临床疗效。方法:纳入204例陈旧性肛裂患者,随机分为治疗组与对照组,每组102例。治疗组采用肛裂缝切术治疗,对照组采用肛裂切除术治疗。评价两组的临床疗效,比较两组患者的术后并发症发生情况,同时比较两组的住院费用及住院时间。结果:经手术治疗后,两组患者的治愈率均为100%。治疗组患者的术后创缘疼痛、水肿、出血及小便困难、发热情况均优于对照组(P<0.01,P<0.05)。治疗组患者的住院时间较对照组明显缩短(P<0.01),住院费用明显少于对照组(P<0.01)。结论:肛裂缝切术治疗陈旧性肛裂疗效确切,可有效减少术后疼痛、出血、水肿等并发症,缩短住院时间,减少住院费用。
简介:AIM:Toinvestigatetheefficacyofnon-buckledvitrectomywithclassicalendotamponadeagentsinthetreatmentofprimaryretinaldetachment(RD)complicatedbyinferiorbreaksandproliferativevitreoretinophathy(PVR).METHODS:Aretrospective,consecutiveandcaseseriesstudyof40patientswithinferiorbreakRDandPVR≥C1wasconducted.Allpatientsunderwentastandard3-port20-gaugeparsplanavitrectomy(PPV)withgasorsiliconeoiltamponadewithoutsupplementaryscleralbuckling.Thevitreousandallproliferativemembranewerecompletelyremoved,andretinectomywasperformedwhennecessary.Themeanfollow-upwas12.5months.Theprimaryandfinalanatomicsuccessrate,visualacuityandcomplicationswererecordedandanalyzed.RESULTS:Primaryanatomicsuccessratewasachievedin35of40eyes(87.5%)andthefinalanatomicsuccessratewas100%.ThemostcommoncauseofredetachmentwasrecurrentPVR.Thebest-correctedvisualacuity(BCVA)atfinalfollow-upwasimprovedin34eyes(85%),remainedstablein1eye(2.5%),andworsenedin5eyes(12.5%).Themeanvisualacuityatfinalfollow-upwasimprovedsignificantly(P=0.000).CONCLUSION:ThisretrospectivestudyprovidesevidencethatvitrectomywithoutscleralbucklingseemedtobeaneffectivetreatmentforinferiorbreakRDwithPVR.Withcompleteremovalofvitreousandproliferativemembranesandtimingofretinectomy,theinferiorbreakswhichcomplicatedwithPVRcouldbeclosedsuccessfullywithoutadditionalscleralbuckling.