简介:选择有剖宫产手术指征的产妇108例,随机分成观察组(改良剖宫产术)和对照组(传统下腹部横切口子宫下段剖宫产术)各54例。两组比较,观察组具有手术时间短、出血少、术后疼痛时间短(P<0.01),术后恢复快等优点,临床有推广价值。
简介:目的比较改良剖宫产手术与Pfannenstial下腹部横切口子宫下段剖宫产术的效果。方法选取我院2000年2月-2002年10月改良剖宫产手术300例(研究组)及同期同类病例中行Pfannenstial横切口子宫下段剖宫产术150例(对照组),从手术时间、术中出血量、术后排气时间、伤口疼痛镇痛率、伤口感染率等方面进行探讨。结果研究组手术时间、术中出血量、术后排气时间、伤口镇痛率、伤口感染率明显少于对照组(P均<0.01)。结论改良剖宫产术具有手术时间短、术中出血少、术后肠功能恢复快、伤口感染率低、大多数不需术后镇痛及伤口美观、疤痕小等优点。
简介:Thispaperreportsthekineticsofgrouptransferpolymerization(GTP)ofethylacrylate(EA)withzinciodidecatalystin1,2-dichloroethaneusingdimethylketenemethyltrimethylsilylacetal(MTS)asinitiatorat0℃andabove0℃.Theamountofcatalystusedwasstudied.Whenzinciodidecatalystusedismorethan10mol%relativetomonomer,therateofpolymerizationisproportionaltotheconcentrationofmonomer,whereaszinciodidecatalystusedislessthan10mol%ofthemonomer,therateofpolymerizationisindependentofthemonomerconcentration.IntheGTPofEAaninductionperiodwasobservedwhenthezinciodidecontentsarelessthanl0mol%.Ifthereactiontemperatureisover0℃,livingspeciesbecomeunstableanddiminish,leadingtoincompletemonomerconversion.Thereactioncurvesequationsareobtained.Thepolymershavenarrowmolecularweightdistributionswhicharenotchangedasdecreasingzinciodidecontents.Thepolydispersityisabout1.2.
简介:ThispaperreportsthestudyonthepolymerprotectedcatalystCPVC-FeCl3usedinesterification,transesterification,synthesisofacetalsorketalsandrearrangementreactionofpinacol.Thecatalysthastheadvantagesofbeingsimpleinoperation,non-corrosive,easytoseparatefrommixturesandgoodreusability.