Premature Birth, Prenatal Care
Conditions
Keywords
Perinatal Mortality, Perinatal Morbidity, Preterm Birth, Pregnancy Complications, Pregnancy, Natural History
Brief summary
Preterm delivery, preeclampsia and intrauterine growth restriction are leading causes of perinatal morbidity and mortality. Efforts to treat these syndromes have not been effective, most likely becuase these obstetric complications are the clinical expression of adaptive mechanisms of host defense developed in response to pathologic insults. Since the ultimate pathologic basis of disease is unclear, therapy for these syndromes has been largely directed at symptoms, which appear late in the development of the disease. The main purpose of this study is to perform an early and comprehensive exploration of maternal and fetal factors that predict the subsequent develpment of these obstetrice complications, so that early medical interventions may be tested in patients at high and low risk for adverse perinatal outcome.
Detailed description
Preterm delivery, preeclampsia and intrauterine growth restriction are leading causes of perinatal morbidity and mortality. Efforts to treat these syndromes have not been effective, most likely because these obstetric complications are the clinical expression of adaptive mechanisms of host defense developed in response to pathologic insults. Since the ultimate pathologic basis of disease is unclear, therapy for these syndromes has been largely directed at symptoms, which appear late in the development of the disease. The main purpose of this study is to perform an early and comprehensive exploration of maternal and fetal factors that predict the subsequent development of these obstetric complications, so that early medical interventions may be tested in patients at high and low risk for adverse perinatal outcome.
Interventions
None listed
Sponsors
Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD)
Study design
Observational model
COHORT
Time perspective
PROSPECTIVE
Eligibility
Sex/Gender
FEMALE
Age
15 Years to 45 Years
Healthy volunteers
No
Inclusion criteria
* INCLUSION CRITERIA: * Gestational age between 6 and 22 weeks for the first visit based on the patient s last menstrual period as reported by the patient. * High risk group: presence of specific risk factors for preterm delivery, pregnancy-induced hypertension or intrauterine growth retardation. * Low risk group: normal pregnancy with no risk factors for preterm delivery, pregnancy-induced hypertension or intrauterine growth retardation (control population, selected between 6 and 22 weeks at the prenatal care clinic). The rationale to include this group is that 50-70% of preterm deliveries occur in patients without risk factors for preterm birth. * Consent to participate in the study. * Patient should be able to attend each Perinatal Research Center for prenatal care and participation in this study.
Exclusion criteria
* Preterm labor, preterm PROM, preeclampsia or impaired fetal growth at the time of recruitment. * Any maternal or fetal condition that requires termination of pregnancy. * Known major fetal anomaly or fetal demise. * Active vaginal bleeding. * Multifetal pregnancy with greater than or equal to 3 fetuses. * Serious medical illness (renal insufficiency, congestive heart disease, chronic respiratory insufficiency, etc). * Severe chronic hypertension (requiring medication). * Asthma requiring systemic steroids. * Patient requiring anti-platelet or non-steroidal anti-inflammatory drugs. * Active hepatitis. * Lack of consent.
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Preterm delivery | Ongoing | Preterm delivery will be classified according to the immediate clinical antecedent of delivery (spontaneous preterm labor with intactmembranes, preterm premature rupture of membranes and pretermdelivery for maternal or fetal indications). |
| Preeclampsia | Ongoing | Preeclampsia will be defined according to the following criteria:-Systolic blood pressure greater than or equal to 140 mmHg and/or diastolic blood pressure greater than or equal to 90 mmHg on twooccasions greater than or equal to 6 hours apart.-Proteinuria greater than or equal to 300 mg/24 hr or freater than or equal to 2+ (dipstick) on two occasions greater than or equal to 6 hours apart.-The diagnosis of severe preeclampsia will be made in the presence of any of the following: blood pressure greater than or equal to 160 mmHg (systolic) or greater than or equal to 110 (diastolic) on at least two occasions, proteinuria greater than or equal to 5 gr /24 hr, pulmonary edema, thrombocytopenia, oliguria, neurologic symptoms(headache, visual disturbances, persistent hyperreflexia, upperabdominal pain and HELLP syndrome). Eclampsia will be diagnosed if convulsions develop. |
| Intrauterine growth restriction | Ongoing | Intrauterine growth retardation / small for gestational age infantA small for gestational age fetus will be considered that with a birth weight which is below the 10th percentile for gestational age. Additional cutoffs (5th and 3rd percentile) will also be explored. |
Countries
Chile
Outcome results
None listed