Biomaterial Database

Results of an epidemiologic study of postdate pregnancy. 1986

B P Sachs, and E A Friedman

Obstetric and neonatal data on 18,610 deliveries between 1975 and 1982 were analyzed to determine the risks associated with postdate pregnancy in an era of routine fetal heart rate monitoring. Thirteen percent of the deliveries occurred between 42 and 43 weeks' gestation, and 1% occurred at 44 weeks or later. There was a nonsignificant rise in the perinatal mortality rates for 38-41-week deliveries as compared to those delivered at 42 weeks or later. However, the perinatal mortality rate was six times higher for small-for-gestational-age infants. There was a significant rise in the perinatal morbidity in infants delivered at or beyond 42 weeks (5% incidence). This finding implies that the sensitivity of currently used screening tests for perinatal mortality is good but that it is unsatisfactory for the detection and prevention of morbidity.

UI	MeSH Term	Description	Entries
D007226	Infant Mortality	Postnatal deaths from BIRTH to 365 days after birth in a given population. Postneonatal mortality represents deaths between 28 days and 365 days after birth (as defined by National Center for Health Statistics). Neonatal mortality represents deaths from birth to 27 days after birth.	Neonatal Mortality,Mortality, Infant,Postneonatal Mortality,Infant Mortalities,Mortalities, Infant,Mortalities, Neonatal,Mortalities, Postneonatal,Mortality, Neonatal,Mortality, Postneonatal,Neonatal Mortalities,Postneonatal Mortalities
D007231	Infant, Newborn	An infant during the first 28 days after birth.	Neonate,Newborns,Infants, Newborn,Neonates,Newborn,Newborn Infant,Newborn Infants
D007233	Infant, Postmature	An infant born at or after 42 weeks of gestation.	Infants, Postmature,Postmature Infant,Postmature Infants
D011247	Pregnancy	The status during which female mammals carry their developing young (EMBRYOS or FETUSES) in utero before birth, beginning from FERTILIZATION to BIRTH.	Gestation,Pregnancies
D011273	Pregnancy, Prolonged	A term used to describe pregnancies that exceed the upper limit of a normal gestational period. In humans, a prolonged pregnancy is defined as one that extends beyond 42 weeks (294 days) after the first day of the last menstrual period (MENSTRUATION), or birth with gestational age of 41 weeks or more.	Prolonged Pregnancy,Pregnancies, Prolonged,Prolonged Pregnancies
D001724	Birth Weight	The mass or quantity of heaviness of an individual at BIRTH. It is expressed by units of pounds or kilograms.	Birthweight,Birth Weights,Birthweights,Weight, Birth,Weights, Birth
D005260	Female		Females
D005316	Fetal Distress	A nonreassuring fetal status (NRFS) indicating that the FETUS is compromised (American College of Obstetricians and Gynecologists 1988). It can be identified by sub-optimal values in FETAL HEART RATE; oxygenation of FETAL BLOOD; and other parameters.	Nonreassuring Fetal Status,Fetal Status, Nonreassuring
D005318	Fetal Heart	The heart of the fetus of any viviparous animal. It refers to the heart in the postembryonic period and is differentiated from the embryonic heart (HEART/embryology) only on the basis of time.	Fetal Hearts,Heart, Fetal,Hearts, Fetal
D005323	Fetal Monitoring	Physiologic or biochemical monitoring of the fetus. It is usually done during LABOR, OBSTETRIC and may be performed in conjunction with the monitoring of uterine activity. It may also be performed prenatally as when the mother is undergoing surgery.	Monitoring, Fetal,Fetal Monitorings,Monitorings, Fetal