PRETERM DELIVERY PATRICK DUFF, M.D..

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Presentation transcript:

PRETERM DELIVERY PATRICK DUFF, M.D.

PRETERM DELIVERY

PRETERM DELIVERY OVERVIEW Etiology Neonatal complications Treatment

Definition - labor prior to 37 weeks’ gestation Frequency - 12 % PRETERM DELIVERY Definition - labor prior to 37 weeks’ gestation Frequency - 12 % 500,000 preterm births annually 30% of these births are < 34 weeks

PRETERM DELIVERY IMPACT When anomalies incompatible with life are excluded, complications of preterm birth are responsible for almost 75% of all neonatal deaths

PRETERM DELIVERY ETIOLOGY PROM – single most important etiology Abruptio placentae Placenta previa Uterine or cervical anomaly

PRETERM DELIVERY ETIOLOGY Fetal anomaly Polyhydramnios Systemic disease Dehydration

PRETERM DELIVERY ETIOLOGY Multiple gestation Infection – lower and upper genital tract and systemic Trauma Idiopathic

NEONATAL COMPLICATIONS OF PREMATURITY HMD IVH NEC Sepsis GBS E. coli

NEONATAL COMPLICATIONS OF PREMATURITY Metabolic derangements Thermal instability Renal dysfunction PDA Apnea and bradycardia

PRETERM LABOR EVALUATION Clinical examination Cervical examination Digital and sonographic Uterine monitoring Ultrasound

PRETERM LABOR EVALUATION TEST PURPOSE CBC WBC evaluate for infection HCT  evaluate for blood loss Coagulation tests Identify abruption

PRETERM LABOR EVALUATION TEST PURPOSE Serology Evaluate for infection Urine culture Identify UTI

PRETERM LABOR EVALUATION CXR PCR for gonorrhea and chlamydia Saline microscopy for BV Culture for GBS Amniocentesis Culture Cytokines

MANAGEMENT OF PRETERM LABOR Treat underlying disorder Assess fetal well being Ultrasound FHR monitoring Doppler Evaluate for tocolysis

MANAGEMENT OF PRETERM LABOR STEROIDS Betamethasone 12 mg i.m. q 24h x 2 doses Dexamethasone 6 mg i.m. q 12h x 4 doses Effects Decrease in RDS Decrease in IVH Decrease in NEC

MANAGEMENT OF PRETERM LABOR ANTIBIOTICS INFECTION TREATMENT Gonorrhea Ceftriaxone, 250 mg i.m. plus Azithromycin, 1000 mg p.o. Chlamydia

MANAGEMENT OF PRETERM LABOR ANTIBIOTICS INFECTION TREATMENT Bacterial vaginosis Metronidazole, 500 mg p.o. BID x 7 d Metronidazole, 2 grams p.o. x 1 GBS Ampicillin, 2 g x 1, then 1 g Q 4h until delivery Chorioamnionitis Ampicillin (2 g Q 6h) plus gentamicin (1.5 mg/kg/day)

TOCOLYTICS TERBUTALINE Mode of administration – SQ, PO, or IV Dose - 0.25 mg SQ and 5 mg PO Adverse effects - cardiovascular and metabolic Rarely used today because of these side effects

TOCOLYTICS MAGNESIUM SULFATE Mode of administration - IV Dose – 4 to 6 g load plus 2-4g/h, titrated to effect Provides tocolysis and neuroprotection Adverse effects Muscle weakness Visual changes Hypocalcemia

TOCOLYTICS INDOMETHACIN Mode of administration - oral Dose - 25 mg Q 6h Adverse effects Stricture of DA Oligohydramnios Should not be used after 32 weeks or for > 48 h

TOCOLYTICS NIFEDIPINE Mode of administration - oral Dose - 10 mg Q 20 minutes x 3, then 10 mg q 4 to 6h Principal adverse effect  hypotension Preferred agent because of ease of administration and tolerability

PREVENTION OF PRETERM DELIVERY DRUG DOSING REGIMEN Progesterone vaginal suppositories 100 mg daily Micronized progesterone tablets 200 mg daily 17-OH P 250 mg i.m. weekly Effectiveness – approximately 50%

PREVENTION OF PRETERM DELIVERY

PRETERM LABOR CONCLUSIONS Frequency – 12% Multifactorial etiology Single most important cause of neonatal mortality Management Tocolytics Corticosteroids Antibiotics – in selected instances Preventive measures in subsequent pregnancy