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1、Premature deliveryProlonged pregnancyPremature Rupture of Membranes(PROM),Content,PRETERM LABOR早 产,Preterm Labor:Labor occurs after 28 weeks but before 37 weeks(ie.196258days)gestation.Infants born during these phase are premature infants.The premature infants weight is between 1000 and 2499g.The pr
2、ognosis of the premature infant is correlated with its gestational age,weight.,Definition:,Etiology:,1.Obstetric complications 产科并发症2.Medical complications 内科并发症3.Surgical complications 外科并发症4.Genital tract anomalies 生殖道畸形,1.Obstetric complications:Severe hypertensive state or pregnancyAnatomic diso
3、rder of the placenta(abruptio placentae,placenta previa)Premature rupture of membranes Polyhydramnios or oligohydramniosMultiple pregnancyPrevious laceration（裂伤）of cervix or uterus,2.Medical complications:Pulmonary or systemic hypertensionRenal diseaseHeart diseaseInfection:genital tract infection,u
4、rinary tract infection,pyelonephritis肾盂肾炎,acute systemic infectionHeavy cigarette smokingAlcoholism or drug addictionSevere anemia,3.Surgical complications:Conization of cervix宫颈锥切术Previous incision in uterus or cervix(cesarean delivery剖宫产术)4.Genital tract anomaliesBicornuate双角,subseptate纵隔,or unico
5、rmuate单角 uterusCongenital cervical incompetency先天性宫颈闭合不全,Clinical Finding&Diagnosis,1.Symptom and SignUterine contractionsmore than 2 in one-half hour;Vaginal bleeding-bloody mucous vaginal discharge or“bloody show”;Dilatation扩张 and effacement消退 of cervix-change in dilatation or effacement of at lea
6、st 1cm or a cervix that is well effaced and dilatated(at least 2 cm);,2.Laboratory StudiesCompletely blood count with differentialCervix discharge cultures：should be sent for gonorrhea淋病 and chlamydia衣原体.Fetal fibronectin纤连蛋白（Ffn):negative test is effective at ruling out imminent delivery(within 2 w
7、eeks)；positive test（Ffn50ng/ml):result is sensitive at predicting preterm birth.分泌物,3.Accessory examination:Ultrasound examination for fetal size,position,placenta location，and cervical length.Cervical length30nm:prognosticating premature delivery.Infundibulum漏斗 length of cervical internal os25%Cerv
8、ical length or Amniocentesis to ascertain fetal lung maturity,the amnio fluid羊水 be tested for lecithin卵磷脂/sphingomyelin鞘磷脂(L/S)ratio,principle:If the fetus is alive,with no PROM 胎膜早破,fetal distress,or the severe pregnancy complications，the uterine contraction should be inhibited to prolong the gesta
9、tional age.If premature delivery is unavoidable,something must be done to elevate the survival rate of the premature infant.,Treatment:,1.Bed rest：2.Corticosteroids:to accelerate fetal lung maturity Betamethason 倍他米松:12mg IM 1/24 hr 2 doses Dexamethasone地塞米松:6 mg IM 1/12 hr 4 doses3.Antibiotics:no b
10、enefit in delaying preterm birth.4.Tocolysis：,4.Tocolysis Tocolytic therapy should be considered in the patient with cervical dilation less than 3 cm.(1)Beta-Mimetic Adrenergic Agents肾上腺受体激动剂 Ritodrine利托君，Terbutaline特布他林，salbutamol沙丁胺醇：(2)Magnesium sulfate硫酸镁:first line agent for tocolysis;(3)Calciu
11、m Channel Blockers钙离子通道拮抗剂;nifedipine硝苯地平(4)Prostaglandin Synthetase Inhibitors前列腺素合成抑制剂 indomethacin吲哚美辛,Some cases in which preterm labor should not be suppressed.Maternal factors:Fetal factors:Maternal factors:Severe hypertensive diseasePulmonary or cardiac diseaseAdvanced cervical dilationMatern
12、al hemorrhage,Fetal factors:Fetal death or lethal anomalyFetal distressIntrauterine infectionTherapy adversely affecting the fetusEstimated fetal weight2500gErythroblastosis fetalisSevere intrauterine growth retardation,Manner of labor 1.Vaginal delivery:perineum section会阴切开术 2.Cesarean section:abno
13、rmal fetal position胎位异常 fetal distress胎儿窘迫 maternal hemorrhage孕妇出血 severe maternal complications孕妇严重的并发症,Case File,A healthy 20-year-old pregnant woman,G1P0 at 29 weeks gestation present to the labor and delivery area complaining of intermitten abdominal pain.She denies leakage of fluid or bleeding
14、per vagina.Her antenatal history has been unremarkable.She has been eating and drinking normally.On examination,the fetal heart rate tracing reveals a baseline heart rate of 120bpm and reactive pattern.Uterine contraction are occuring every 3 to 5 min.On pelvic examination,her cervix is 1 cm dilated
15、,90%effaced,and fetal vertex is presenting at-1 station.,What is the most likely diagnosis?Preterm labor.What is your next step in management?Tocolysis,try to identify a cause of the preterm labor,antenatal steroids,and antibiotics.,Questions,PROLONGED PREGNANCY(POSTTERM PREGNANCY),General considera
16、tion:,Definition:Prolonged pregnancy is defined as pregnancy that has reached 42 weeks of completed gestation from the first day of the LMP or 40 weeks gestation from the time of conception.,The maternal risk:Related to extraordinary fetal size:Dysfunctional labor功能障碍性分娩Arrested progress of labor 产程
17、停止 Fetopelvic disproportion胎盆不称 Cesarean section 剖宫产 Labor trauma 分娩损伤,Effect to fetus:Impaired nutritional supply(weight loss,reduced subcutaneous tissue,scaling脱皮,parchmentlike skin羊皮纸样皮肤)-dysmaturity 成熟障碍 Birth injury(shoulder dystocia肩难产)Oligohydramnios羊水过少 Fetal distress胎儿窘迫Meconiurn aspiration
18、 syndroame（MAS)胎粪吸入综合征Asphyxia neonatorum新生儿窒息,ETIOLOGY,Prolonged pregnancy may relate to:Dysfunction of estrogen/progesteron(E/P)ratio雌孕激素比例失调：prostaglandin前列腺素,estrogen雌激素 progestin孕激素cephalopelvic disproportion头盆不称（cpd):Fetal deformity胎儿畸形;Genetic factors遗传因素:placenta sulfatase deficiency胎盘硫酸酯酶,P
19、ATHOLOGY,Placenta:normal or hypofunction功能减退 Amniotic fluid:Oligohydramnios羊水过少Meconium dye of amniotic fluid羊水粪染Fetus:Fetal macrosomia巨大胎儿Fetal dysmaturity胎儿成熟障碍Small-for-date infant小样儿,Diagnosis:,1.Confirmation of gestational age:by referring to records of:Mecial history:LMP,the exact time of conc
20、eption,ovulate time,et al;Clinical expression:early pregnancy reaction,quickening time,gynecological examination in first trimester,et al;Laboratory tests:ultrasound:examination,and clinical parameters of early pregnancy(e.g,hCG),2.Judgment of the placental function:Fetal movement count胎动计数:Fetal el
21、ectrical monitor胎儿电子监护:Ultrasound examination超声检查:Urine estrogen/creatinine ratio雌激素和肌酐比值:Amnioscopy羊膜镜检查:,Treatment:,Indication of terminal pregnancy:Cervical matureFetal weigth4000g,or non reaction pattern of NST,or CST positive(doubtful)Urine estrogen/creatinine ratio decreasedFetal movement Olig
22、ohydramniosWith eclampsia of pre-eclampsia,1.Induced labor:Cervix is mature,bishop score7 When cervix is mature:人工破膜Oxytocin,Prasterone普拉睾酮Prostaglandin前列腺素：propess普贝生(Dinoprostone Suppositories地诺前列酮栓）,3.Cesarean section:Failure of induced labor;Arrested progress of labor;Fetal distress;Disposition;
23、Large fetus;Amniotic fluid is abnormal;Pregnancy complications;Fetal compromise:breech presentation,et al.,Premature Rupture of Membranes(PROM),DEFINITION,The fetal membrane rupture happens before labor.Premature rupture of membrane can cause preterm labor,prolapse of umbilical cord,and maternal and
24、 fetal infection.The less the gestational age,the worse the prognosis of the perinatal infant.,Essentials of Diagnosis,1.History of a gush of fluid from the vagina or watery vaginal discharge;2.Demonstration of amniotic fluid leakage from the cervix.,ETIOLOGY,Genital tract pathogenic microorganism u
25、pgoing infection:Amniotic cavity pressure increase:Pressure on fetal membrane is unbalanced;Nutritional factor;Cervical incompetence;Cytokine:,Pathology&Pathophysiology,Preterm laborProlapse of the umbilical cordPlacenta abruptionIntrauterine infectionChorioamnionitis,DIAGNOSIS,1.SymptomSudden gush
26、of fluid or continued leakageThe color and consistency of the fluid and the presence of Vernix caseosa胎脂or meconium胎粪,reduce size of the uterus,and increased prominence of the fetus to palpation.,2.Sterile speculum examinationPooling:the collection of amniotic fluid in the posterior fornix;Nitrazine
27、 test:the nitrazine paper turns blue,demonstrating an alkaline PH(7.0-7.25);Ferning:Fluid from the posterior fornix is placed on a slide and allowed to air-dry.Amniotic fluid will form a fernlike pattern of crystallization;Be care of false negative result:vaginal infections,presence of blood or seme
28、n,3.Physical examination:To search for other signs for infection.4.Laboratory studies:Complete blood count with differentialUltrasound examination for fetal size and amniotic fluid indexAmniocentesis to determine fetal lung maturity and the presence of infection,5.ChorioamniotisThe most reliable sig
29、ns of infection include:Fever:the temperature should be checked every 4 hoursMaternal leukocytosis:daily leukocyte count and differential.An increase in the white blood cell count or neutrophil count may indicate the presence of intra-amniotice infectionUterine tenderness:check every 4 hoursTachycar
30、dia:either maternal pulse 100bpm or fetal heart 160 bpm is suspicious.,Influence on Mother and Fetus,Influence on mother:Infection;Placenta abruptionInfluence on fetus:Premature deliveryrespiratory distress syndrome of newborn新生儿呼吸窘迫综合症Chorioamnionitis绒毛膜羊膜炎aspiration pneumonitis of newborn新生儿吸入性肺炎，
31、septicemia败血症prolapse of cord脐带脱垂fetal distress,Treatment,1.Expectant management:is appropriate for those whose gestational age between 28 and 35 weeks,without chorioamnionitisGeneral management:bed rest,hydration,clean,patients temperature,heart rate,contraction,vaginal leakage,blood leukocyte coun
32、t,et al.Antibiotic:Tocolysis:Corticosteroids:,2.Chorioamnionitis(1)delivery:If chorioamnionitis is present in the patient with PROM,the patient should be actively delivered regardless of gestational age.(2)Broad-spectrum antibiotics,3.Term pregnancy without chorioamnionitis:(1)Expectant management:Waiting for patient to go into labor spontaneously;(2)Active management:Induction of labor with an agent such as oxytocin;,Thank you!,
