Can Anything Be Done About Mid-Trimester Fetal Wastage?

In Victoria in the triennium 1982-1984, perinatal losses between 22 and 28 weeks' gestation accounted for 32% of the overall perinatal wastage of 12.7 per 1,000 births. Over the same period only 1.2% of babies were delivered weighing less than 1,500g, but this group made up 40% of the total stillbirths and 50% of the neonatal deaths. By contrast the perinatal wastage was only 7 per 1,000 births in babies born weighing more than 1,500g and this included lethal congenital malformations. The major antenatal risk factors contributing to the high mid-trimester fetal wastage were premature labour (17.7%), multiple pregnancy (13.9%), cervical incompetence (12.9%), antepartum haemorrhage (12.9%), premature rupture of the membranes (11.5%), lethal congenital malformations (10.6%) and hypertensive disorders (7.4%). Cognizant of the frequency of preventable factors, the Consultative Council on Maternal and Perinatal Mortality and Morbidity in Victoria recommends that, where feasible, the mother of these high-risk pregnancies be transferred to a centre where facilities are available to monitor the pregnancy and labour, and which offers intensive care facilities for the baby.     

Early Onset Neonatal Group B Streptococcus (GBS) Infection: Associated Obstetric Risk Factors

An analysis of all early onset neonatal Group B streptococcal (GBS) infections at the Royal Women's Hospital, Melbourne was made for the 10-year period 1979-1988. There were 104 cases with 29 neonatal deaths (28%). One or more predisposing perinatal risk factors was evident in 82% of cases (premature labour 79%, prolonged membrane rupture (greater than 12 hours) 57%, premature rupture of the membranes 69%, maternal sepsis 29%). Overall, 88% of GBS infections were evident within 24 hours of birth, suggesting an intrapartum pathogenesis for infection.     

Life-table analysis of the risk of perinatal death at term and post term in singleton pregnancies

OBJECTIVE: This study was undertaken to estimate the cumulative risk of perinatal death associated with delivery at each gestational week both at term and post term. STUDY DESIGN: The numbers of antepartum stillbirths, intrapartum stillbirths, neonatal deaths, and surviving neonates delivered at between 37 and 43 weeks' gestation in Scotland, 1985-1996, were obtained from national databases (n = 700,878) after exclusion of multiple pregnancies and deaths caused by congenital abnormality. The numbers of deaths at each gestational week were related to appropriate denominators: antepartum stillbirths were related to ongoing pregnancies, intrapartum stillbirths were related to all births (excluding antepartum stillbirths), and neonatal deaths were related to live births. The cumulative probability of perinatal death associated with delivery at each gestational week was estimated by means of life-table analysis. RESULTS: The gestational week of delivery associated with the lowest cumulative risk of perinatal death was 38 weeks' gestation, whereas the perinatal mortality rate was lowest at 41 weeks' gestation. The risk of death increased more sharply among primigravid women after 38 weeks' gestation because of a greater risk of antepartum stillbirth. The relationships between risk of death and gestational age were similar for the periods 1985-1990 and 1991-1996. CONCLUSION: Delivery at 38 weeks' gestation was associated with the lowest risk of perinatal death.     

Group B Streptococcus (GBS) and Neonatal Infections: The Case for Intrapartum Chemoprophylaxis

At the Royal Women's Hospital, Melbourne over an 8-year period (1981-1988) all public antenatal patients were screened at 32 weeks' gestation for group B streptococcus (GBS). In a total of 30,197 livebirths there were no early onset neonatal GBS infections in infants of treated asymptomatic carrier mothers. By contrast there were 27 infections with 8 deaths in an unscreened control group of private patients (total livebirths 26,915). It is recommended that GBS screening occur antenatally at 28 weeks and that intrapartum chemoprophylaxis be offered at least to those carriers with obstetric risk factors.     

Management and outcome of pregnancy in diabetes mellitus, classes B to R

During the period 1971 to 1975, 260 women with diabetes mellitus, Classes B through R, were delivered of their infants at Los Angeles County Women's Hospital. The plan of patient management included frequent clinic visits and hospitalization to assure good control. A program of intensive antepartum fetal surveillance was begun at 34 weeks' gestation, with the use of daily 24 hour urinary estriol determinations and a weekly contraction stress test (CST). A lecithin/sphingomyelin ratio was evaluated for all patients before elective delivery. The perinatal mortality rate in these diabetic pregnant women was 46 per 1,000 as compared to 24 per 1,000 in the general population. Only three stillbirths occurred in the diabetic group, none within one week of a negative CST. Congenital malformations were responsible for almost half of the neonatal deaths. There were no deaths due to iatrogenic prematurity or trauma. Mean gestational age at delivery was 37.9 weeks and vaginal delivery was the mode for approximately half of the women. Two thirds of the infants did experience some morbidity.     

Total perinatal wastage. A clarification of priorities

The pregnancy outcome of 16,971 women carrying 17,352 living fetuses after 16 weeks gestation was studied. As well as recording perinatal deaths, all losses before 28 weeks and up to one year after delivery were recorded to give a total perinatal wastage rate of 21.6 per 1000 fetuses alive at 16 weeks compared with a perinatal mortality rate (stillbirths plus early neonatal deaths) of 7.8 per 1000 births. All deaths were then classified according to pathological sub-groups. The concept of auditing perinatal care using perinatal mortality was then compared with that using total perinatal wastage.     

Maternal Narcotic Addiction: Pregnancy Outcome in Patients Managed by a Specialized Drug-Dependency Antenatal Clinic

A retrospective analysis has been made of the outcome of pregnancy in 174 women abusing narcotics, managed by a specialist team from a drug-dependency antenatal clinic. These women were cared for through 182 pregnancies of greater than 20 weeks' gestation, resulting in 183 live and 5 stillbirths. The majority of patients were enrolled in a methadone programme and stabilized on the drug before the third trimester. The group was characterized by a high prevalence of previous obstetric and medical problems. The most common antenatal complications were preterm labour (24%) and anaemia (12%). Preterm delivery and small-for-gestational-age each occurred in a quarter of pregnancies. The mean birth-weight for the group was 2,746 g +/- 721 g; mean +/- S.D. Eight perinatal deaths occurred (5 stillbirths, 3 neonatal deaths), giving a perinatal mortality rate of 43/1,000. The data on narcotic abusers have been compared with similar data obtained from randomly selected public antenatal clinic patients who delivered during the same period.     

Total perinatal wastage. A clarification of priorities

Summary. The pregrmncy outcome of 16 971 women carrying 17 352 living fetuses after 16 weeks gestation was studied. As well as recording perinatal deaths, all losses before 28 weeks and up to one year after delivery were recorded to give a total perinatal wastage rate of 21.6 per 1000 fetuses alive at 16 weeks compared with a perinatal mortality rate (stillbirths plus early neonatal deaths) of 7.8 per 1000 births. All deaths were then classified according to pathological sub-groups. The concept of auditing perinatal care using perinatal mortality was then compared with that using total perinatal wastage.     

Survival and Neonatal and Neurodevelopmental Outcome of 24–29 Week Gestation Infants According to Primary Cause of Preterm Delivery

Summary: A total of 189 infants of 24–29 weeks' gestation were born in a regional perinatal centre during a 2-year period. They were divided into groups according to the primary cause of preterm delivery: antepartum haemorrhage (n=37, 20%), preeclampsia (n=27, 14%), preterm premature rupture of membranes (n=64, 34%), preterm labour (n=27, 14%), chorioamnionitis (n=16, 8%), other complications (n=18, 10%). The perinatal mortality rate (PMR) was 286/1,000 of whom 44% were stillbirths. The 'other complication' group had the highest PMR due to a large number of intrauterine deaths, with no differences in neonatal mortality between the groups. Preeclampsia was associated with an increased risk of necrotizing enterocolitis and chorioamnionitis was associated with an increased risk of periventricular haemorrhage. Follow-up to at least 2 years was performed in 122 (97%) of survivors. Cerebral palsy occurred in 7%, while 18% had neurodevelopmental disability. No relationship was found between primary cause of preterm delivery and outcome. This information should be of value in counselling parents when preterm delivery is imminent.     

When Do Perinatal Deaths in Multiple Pregnancies Occur?

Perinatal mortality for multiple pregnancy remains at least 5 times the rate for singleton births. The major causes are neonatal deaths due to gross immaturity before 30 weeks' gestation, and stillbirths due to intrauterine growth retardation at all gestations, but especially after 32 weeks. Sixty four per cent of perinatal losses before 30 weeks' gestation occur before 26 weeks, highlighting the need to commence prophylactic measures earlier than usually recommended. The perinatal mortality in infants in multiple births weighing more than 2,500g is the same as that of singletons, but is 10 times this rate in multiple births weighing between 500g and 2,500g. Because the stillbirth rate in twins proceeding beyond 38 weeks' gestation is 3 times that of singleton births, elective termination of pregnancy is recommended if spontaneous labour has not occurred by this time.     

The Changing Pattern of Eclampsia

Summary: Between 1940 and 1974, 955 patients with eclampsia were treated at the Royal Women's Hospital, Melbourne. The incidence in booked patients has fallen from 1 in 200 to 1 in 2,800 at present. There were 57 maternal deaths, with a progressive decline in the mortality rate from 8% in the 1940–1949 period to 2.7% between 1960 and 1969; no maternal deaths have occurred in the 5 years subsequently. Including previable cases, the perinatal wastage has been reduced from 30% to 14%. The incidence of multiple pregnancy was 6.2%. The Caesarean section rate was 5%. In booked patients, postpartum eclampsia is now the commonest variety and is of milder severity than formerly.     

Declining perinatal mortality in Finland between 1987 and 1994: Contribution of different subgroups

Objective: To examine the extent to which the decline in perinatal mortality is attributable to some subgroups, especially to certain birthweight or gestation groups. Study Design: A register study using the Finnish Medical Birth Register for years 1987 to 1994. Results: Of the overall reduction in perinatal mortality from 8.8 to 6.7 per 1000 births, 78% was due to stillbirths, compared with 22% due to early neonatal deaths. The decline in mortality among infants who weighed under 1500 g at birth was the major contributor (62%) to the overall reduction in perinatal mortality. The largest decline in mortality in the stillbirth group occurred among those weighing < 1000 g, while for early neonatal deaths the group most affected weighed 1000-1499 g. A similar pattern emerged when the gestation-week groups were examined. Conclusion: The decline in perinatal mortality is attributable to stillbirths of very low birthweight. The most likely explanations for this result are the improved antenatal and neonatal care and the wider use of malformation screening.     

High risk antenatal hospitalization

High risk, antenatal units have been established to provide highly sophisticated obstetric care for women with complications of pregnancy. In an effort to more precisely define the patients requiring this care, and to begin to document the benefits of antenatal hospitalization, a 2-year prospective evaluation of the Antenatal Unit (AU) at the Brigham and Women's Hospital was performed. Between July 1, 1978 and June 30, 1980, 1488 consecutive patients were admitted to the AU. Demographic data, antenatal hospitalization time, hospitalization outcome, and delivery data were determined for these patients. Diabetes mellitus, premature labor, hypertensive disorders, premature rupture of the membranes, and late pregnancy bleeding disorders resulted in over 60% of the admissions. Follow-up data demonstrated that among these 1488 patients admitted to the AU, there occurred 32 stillbirths (21.5/1000), 50 neonatal deaths (33.6/1000), and no maternal deaths. This study demonstrated that a broad spectrum of medical, surgical, and obstetric complications necessitate antenatal hospitalization, resulting in an overall perinatal survival rate of 95%.     

Optimal gestational age for twin delivery.

OBJECTIVE: We evaluated the timing of twin delivery associated with perinatal outcome in gestations of at least 36 completed weeks. STUDY DESIGN: This was a retrospective analysis of infant and maternal hospital records for a consecutive series of twin deliveries at New York Hospital-Cornell Medical Center. The inclusion criteria were delivery after 36 weeks' gestation during a 7-year period (1987 to 1993), without congenital anomalies or early fetal demise. Adverse perinatal outcomes were compared between deliveries before 38 weeks' gestational age and those at or after 38 weeks' gestation. RESULTS: Of 776 twin deliveries during the study period, 329 met the inclusion criteria. Adverse perinatal outcome was significantly higher among the twin pregnancies that delivered before 38 weeks' gestation compared with those that delivered at or after 38 weeks' gestation. Twin pregnancies that delivered between 36 and 37 weeks' gestation were 13 times more likely to require neonatal intensive care compared with those who delivered at or after 38 weeks' gestation (95% confidence interval 1.8 to 95.9; p < 0.001). CONCLUSION: In uncomplicated twin gestations, delivery at between 36 and 37 weeks' gestation was not associated with a reduction in neonatal complications compared with deliveries at or after 38 weeks' gestation.     

Seventy-one quadruplet pregnancies: management and outcome

This article reviews the epidemiology, management, and outcome of 71 quadruplet pregnancies that occurred between 1980 and 1989. A study of detailed medical questionnaires and medical records revealed that 67 (94%) of the pregnancies followed ovulation induction therapy. A majority of the pregnancies were diagnosed by 9.3 weeks' gestation and bed rest was instituted by 16.7 weeks; 14% of women had cervical cerclages. Tocolytic agents were used in 59 (83%) of the group beginning at 24.5 weeks' gestation. The mean gestational age at delivery was 31.4 weeks and the mean birth weight was 1482 gm. Cesarean sections were performed in 89% of the cases. The average maternal weight gain was 45.8 pounds. Of the 284 fetuses, there were six first-trimester losses (including one ectopic pregnancy), 10 stillbirths and 33 neonatal deaths, resulting in a stillbirth rate of 29 per 1000, and corrected neonatal and perinatal mortality rates of 37 per 1000 and 67 per 1000, respectively. Other than premature labor, the most common maternal complications were first-trimester bleeding (35%), toxemia (32%), and anemia (25%). The quadruplet fetal growth curve parallels the singleton 25th percentile until 34 weeks, when it drops below the 10th percentile. These data suggest that a majority of quadruplets are delivered after 28 weeks and a viable outcome is expected. Because of retarded growth after 34 weeks, delivery should be considered at 34 weeks in most cases.     

Breech delivery at term: do the perinatal results justify a trial of labour?

This is a retrospective study conducted at Princess Badee'a Teaching Hospital in North Jordan to compare neonatal loss and morbidity in term singleton breech infants delivered either vaginally or by caesarean section. In this study, all singleton term breech presentation at 37 completed weeks' gestation were reviewed. Three hundred and eight singleton term babies, presenting by the breech were studied. Intrapartum deaths, neonatal deaths and Apgar scores in vaginal and caesarean delivery were compared. After exclusion of infants with lethal congenital malformations and antenatal stillbirths, the incidence of intrapartum and neonatal deaths associated with vaginal births was 3.5% compared with 1.3% in infants born abdominally. The number of low Apgar scores were similar in both groups. We concluded that caesarean section for term singleton breech presentation is associated with good neonatal outcome and this may influence the decision of obstetricians about the mode of delivery.     

Acceptance of Mementos of Fetal and Perinatal Loss in a South Australian Population

Summary: A package of mementos of a fetal or perinatal loss has been shown to help with the grieving process. The level of acceptance and the factors influencing acceptance of these mementos in a South Australian population was examined over a 27-month period. Data were available on 447 women and the acceptance rate was 79.6%. Major influences on the acceptance of mementos were maternal age and gestational age. Mothers in the 20–30 year age group were more likely to accept mementos than younger and older mothers. This age-related effect was more noticeable among genetic terminations and neonatal deaths than among spontaneous abortions or stillbirths. Memento acceptance of miscarriages and stillbirths over 20 weeks' gestation was significantly greater than for younger gestation. These findings may have an impact on the psychosocial management of perinatal loss. The high level of acceptance of these mementos is encouraging and vindicates our current practice which we recommend to others involved in the management of perinatal loss.     

The Short-term Outcome of Infants of Multiple Pregnancies Delivered Before 28 Weeks'' Gestation

The short-term outcomes of 29 multiple pregnancies delivered at Westmead Hospital between 20 and 28 weeks' gestation, during a 5-year period are reported. The earliest gestation at which there was a survivor was 24 weeks. The overall survival rate was 25%. Of deaths, 11.1% occurred in the delivery suite, 85.2% in the neonatal period with a further 3.7% in the postneonatal period in hospital. The outcomes for second twins were generally poor. Of survivors at 12 months, 44% were judged to have a major impairment. Extremely preterm multiple pregnancies have a high mortality and morbidity rate.     

Contribution of Prematurity and Low Birth-Weight to Neonatal Death in Chinese and Western Populations

This paper analyses the contribution of low birth-weight (birth-weight between 500 and 2,500 g) and prematurity (gestation less than 37 weeks) to neonatal death in Chinese and Western populations. The incidences of low birth-weight in the Tsan Yuk Hospital, Hong Kong, the State of Victoria, and the Mercy Maternity Hospital, Melbourne, were 4.63%, 4.29% and 5.66% respectively and the incidences of prematurity were 2.08%, 4.89% and 7.42% respectively. The neonatal mortality rate (per 1,000 livebirths) for premature infants born in Victoria was 64, 89 for those born at the Mercy Maternity Hospital and 119 for the Tsan Yuk Hospital. This paper has demonstrated that a striking differences exists in prematurity rates between Chinese and Western populations, and also that the mortality rate of premature infants is lower in Western populations. If the reason for the lower incidence of prematurity in the Chinese population could be determined and the mortality of premature infants maintained in the Western population, a significant lowering of perinatal mortality would result. Studies to determine causes for premature births in Chinese and Western populations should therefore be undertaken.     

The Short-term Outcome of Singleton Infants Delivered Before 28 Weeks'' Gestation

The short-term outcome of 271 singleton infants born at Westmead Hospital between 20 and 28 weeks' gestation, during a 5-year period are reported. The earliest gestation at which there was a survivor was 23 weeks. Survival rates from 23-23+6 weeks to 27-27+6 weeks, excluding congenital abnormalities, were 8.3% to 77.5% respectively. Overall 21.9% of deaths occurred in the delivery suite, 63.4% in the neonatal period, 3.7% in the postneonatal period in hospital and a further 11% after discharge from hospital. Of survivors at 12 months, 18.8% were judged to have a major impairment.