摘要:

&NA;Preterm delivery remains a preeminent problem in reproductive and pediatric care worldwide. Recent data suggest that cervicovaginal microflora and/or the inflammatory response they engender produce factors which can cause or predispose to preterm labor and rupture of membranes. Microorganisms mediating such processes may not be “recognized pathogens” and are often considered normal flora. These microorganisms may act singly, additively, or synergistically with host factors released during an induced inflammatory response. Quantitative, as well as qualitative aspects of cervicovaginal microflora may be important. Multiple cervicovaginal microorganisms produce IgA protease, neuraminidase, and mucinase which may facilitate passage of these and other agents past cervical barriers and into the lower uterine segment. Multiple microflora also produce phospholipases A2and C, each of which can locally augment production of eicosanoids within the uterus which are important in cervical ripening and labor. Similar microflora produce various proteases, including collagenase, which can focally weaken the amniochorion and predispose to premature rupture of membranes and cervical ripening. Intrauterine microorganisms induce inflammatory reaction and may engender local release of similar proteases, phospholipases, as well as platelet‐activating factor (PAF) and lymphokines which can also initiate or further potentiate labor‐inducing mechanisms. Recognition of microbe‐induced pathogenesis of some cases of preterm birth offers the hope of specific treatment and prophylaxis. In recent studies, administration of erythromycin and tocolytic agents was associated with an improved outcome in selected women with preterm labor. Further microbiological and clinical studies are ongoing. “Just why so many gravidas go into labor prematurely and hence give birth to infants who often are unable to cope with extrauterine conditions is one of the great unsolved problems of obstetrics.”(1).

ISSN:0029-7828    

出版商:OVID    

年代:1988

数据来源: OVID

摘要:

&NA;During the last 14 years, several articles have given contradictory reports on prevalence rates of squamous cell neoplasia of the cervix and vagina in diethylstilbestrol (DES)‐exposed progeny. In 1984, the DES‐Adenosis (DESAD) Project found that the incidence of cervical and vaginal intraepithelial neoplasia in DES‐exposed daughters was twice as high as in a comparison group of unexposed women. This was also associated with a higher rate of herpes simplex virus and human papillomavirus infections. Possible hypotheses on the etiology of the increased incidence of squamous neoplasia are discussed.

ISSN:0029-7828    

出版商:OVID    

年代:1988

数据来源: OVID

ISSN:0029-7828    

出版商:OVID    

年代:1988

数据来源: OVID

ISSN:0029-7828    

出版商:OVID    

年代:1988

数据来源: OVID

ISSN:0029-7828    

出版商:OVID    

年代:1988

数据来源: OVID

ISSN:0029-7828    

出版商:OVID    

年代:1988

数据来源: OVID

ISSN:0029-7828    

出版商:OVID    

年代:1988

数据来源: OVID

ISSN:0029-7828    

出版商:OVID    

年代:1988

数据来源: OVID

ISSN:0029-7828    

出版商:OVID    

年代:1988

数据来源: OVID

ISSN:0029-7828    

出版商:OVID    

年代:1988

数据来源: OVID