Search PubMed⌕ Search

Biomedical subjects

R L Naeye

Publications and source records attributed to R L Naeye.

At least 73 records · Page 4Linked to original sources
PubMed1980

Seasonal variations in coitus and other risk factors, and the outcome of pregnancy.

Data were analyzed from 36,068 U.S. pregnancies to determine whether any of the more frequent maternal risk factors are associated with seasonal variations in perinatal mortality rates. These mortality rates decreased below the yearly mean in January and rose sharply above the mean during the spring. The perinatal mortality rate in May/June was 30% above the rate in January/February (P less than 0.001). This and other variations in perinatal mortality rates closely followed changes in maternal coital activity. The proportion of women having coitus was 26% greater in May/June than in January/February (P less than 0.001). Seasonal variations in the frequencies of maternal hypertension, acetonuria and low pregnancy weight gain did not correlate with changes in perinatal mortality rates.

Coitus↗
PubMed1980

Effects of maternal undernutrition and heavy physical work during pregnancy on birth weight.

The study attempted to determine if heavy physical labour by mothers during pregnancy affected fetal growth when such mothers had calorie intakes which were below 70 per cent of WHO/FAO recommended standards. Full term infants of such mothers had a mean birth weight of 3060 +/- 355 (SD) g compared to 3270 +/- 368 SD g for the newborn of less physically active mothers on similar low calorie diets (P less than 0.01). The mothers who engaged in heavy labour had a mean pregnancy weight gain of 3.3 +/- 2.4 (SD) kg, independent of the birth weight of their offspring, compared with 5.9 +/- 3.3 kg for the less active mothers (P less than 0.001). The mothers' weight in early pregnancy had an insignificant influence on birth weights when mothers were on low calorie intakes.

Birth Weight↗
PubMed1980

Selected hormone levels in victims of the sudden infant death syndrome.

Hormone levels were measured in victims of the sudden infant death syndrome (SIDS) to look for clues to the cause of death. SIDS victims who had petechiae on their intrathoracic organs had higher blood levels of cortisol than victims without such petechiae (25 vs 9 micrograms/100 ml, P less than .005). This raises the possibility that SIDS victims who had petechiae had a longer period of predeath stress than did victims without petechiae since experimental studies have shown that the circulation must continue for a time after stress begins to produce such petechiae. The low normal level of cortisol (9 micrograms/100 ml) in SIDS victims who did not have petechiae raises the possibility that their circulation stopped rather promptly after the final stress began. Hypoxemia may have been the mechanism of death in many of the SIDS victims with petechiae. These victims had 20% more muscle in their pulmonary arteries than did victims without petechiae (P less than .05). This muscle increase is a presumed marker for chronic hypoventilation which leads to hypoxemia.

Apnea↗
PubMed1980

Abruptio placentae and placenta previa: frequency, perinatal mortality, and cigarette smoking.

Abruptio placentae and placenta previa are responsible for at least half the excessive fetal and neonatal death associated with maternal smoking during pregnancy. Data from a large prospective study were analyzed to determine if stopping smoking reduced the frequency of these disorders. Mothers who stopped smoking had a 23% lower frequency of abruptio placentae and a 33% lower frequency of placenta previa than women who continued to smoke during pregnancy. The mothers who stopped smoking had only about half as many fetal and neonatal deaths due to abruptio placentae and one third fewer losses to placenta previa than did nothers who continued to smoke. These seeming benefits of stopping smoking were greatest in mothers 30 years of age and older.

Abruptio Placentae↗
PubMed1979

Coitus and associated amniotic-fluid infections.

Data were analyzed from 26,886 pregnancies to determine whether coitus is involved in the genesis of amniotic-fluid infections. The frequency of infection was 156 per thousand births when mothers reported coitus once or more per week during the month before delivery, versus 117 per thousand when no coitus was reported (P less than 0.001). The percentage of infected infants who died was 11.0 when there was coitus versus 2.4 when there was no coitus (P less than 0.001). The frequencies of low Apgar scores, neonatal respiratory distress, and hyperbilirubinemia were about doubled when mothers reported coitus. The coitus-associated effects were greater in preterm than in fullterm infants. The pregnancies in the study took place between 1959 and 1966, when national perinatal mortality rates were higher than they are now. Deaths from coitus-associated infections may be less frequent today.

Black or African American↗
PubMed1979

Weight gain and the outcome of pregnancy.

This study determined the relationship of maternal weight gain in pregnancy to its outcome. Mothers who were overweight at the start of pregnancy had the fewest fetal and neonatal deaths with a 16 pound weight gain at term. The optimal weight gain for normally proportioned mothers was 20 pounds and for underweight mothers 30 pounds. For all three groups perinatal mortality rates increased with weight gains less or more than these optimal values. Very low or very high pregnancy weight gains had only a modest influence on the frequency of common placental and fetal disorders. However, once one of these disorders was established, mortality rates from it usually increased severalfold when mothers had very low or very high weight gains.

Body Height↗
PubMed1979

The effect of diet supplementation and addition of zinc in vitro on the growth-supporting property of amniotic fluid in African women.

The effect of diet supplementation throughout pregnancy on third-trimester amniotic fluid growth-supporting activity (GSP) was studied in 100 African women; 32 were given zinc supplementation, 22 each animal and vegetable supplements, respectively, and 24 served as control subjects. No difference in GSP was noted in any of the four groups, the majority of fluids (65%) being noninhibitory. Zinc levels in fluids from African women were much lower than those described for other population groups at corresponding periods of gestation. Although zinc levels in liquor rose following dietary zinc supplementation, these remained lower than values described in white patients. In vitro addition of zinc (up to 153 mu moles per liter final concentration) to 17 noninhibitory African liquors resulted in these fluids becoming inhibitory.

Africa↗
PubMed1979

Causes of the excessive rates of perinatal mortality and prematurity in pregnancies complicated by maternal urinary-tract infections.

The study was undertaken to determine the causes of the more frequent pre-term deliveries, fetal and neonatal deaths associated with maternal urinary-tract infections during pregnancy. The combined perinatal mortality rate for eight common placental and fetal disorders was 42 per thousand births in the infected vs. 21 per thousand in the noninfected, owing to a greater mortality from noninfectious placental and fetal disorders in the gestations with the urinary-tract infections (P less than 0.001). All the mortality excess took place when the urinary-tract infections occurred within 15 days of delivery. Death rates were highest when the urinary-tract infections coexisted with maternal hypertension and acetonuria.Hydramnios, amniotic-fluid bacterial infections and abruptio placentae were responsible for two thirds of the more frequent preterm deliveries in the pregnancies complicated by urinary-tract infections.

Abruptio Placentae↗
PubMed1979

Factors in the mother/infant dyad that influence the development of infections before and after birth.

A number of maternal factors strongly influence the development and outcome of fetal infections. Severely undernourished mothers produce neonates with evidence of an immunoincompetence that persists into later childhood. Mothers who fast during pregnancy develop metabolic acidosis much more rapidly than non-pregnant women. The metabolic acidosis leads to high fetal and neonatal death rates from a variety of pre-existing disorders, including infections. Such metabolic acidosis also appears responsible for the excessive fetal and neonatal deaths associated with maternal urinary tract infections. Finally, coitus during pregnancy markedly increases both the frequency of bacterial infections of amniotic fluid and the mortality due to them. The effects are greatest at mid-pregnancy and gradually decrease to term.

Acetone↗
PubMed1979

The genesis of amniotic fluid infections.

Amniotic fluid infections manifested by an inflammatory response in the extraplacental membranes and subchorionic plate of the placenta are a common phenomenon thought to be due in most cases to ascending bacterial infections via intact membranes. Fatal spread to the fetus is much less common and more likely to occur in underprivileged communities. The probable reasons are nutritional deprivation in the mother or both, leading to production of a liquor with diminished ability to suppress bacterial growth. Zinc is one component of the antibacterial system but liquor levels of zinc vary widely and inconsistently with antibacterial activity. Dietary supplementation with zinc did not improve antibacterial activity of liquors in a population with diminished liquor antibacterial activity and large number of fatal infections. Other factors in the genesis of amniotic fluid infections may be interference with normal defence mechanisms as a result of coitus in late pregnancy and vaginal infections with Trichomonas vaginalis. Socioeconomic factors may play a role apart from their association with maternal nutrition, through diminished hygiene associated with insufficient use of water and insufficient availability and use of medical facilities.

Amniotic Fluid↗
PubMed1979

The duration of maternal cigarette smoking, fetal and placental disorders.

Data from a large prospective study of pregnancy were used to determine whether the number of years a mother had smoked cigarettes influenced the development of common fetal and placental disorders. Three disorders increased in frequency when mothers had smoked for more than 6 yr: placenta previa +143%, abruptio placentae +72% and large placental infarcts +37% (all P less than 0.05). Mothers' current smoking habits had a smaller influence on the frequency of these disorders, and the effects of smoking were largely independent of maternal pregnancy weight gain. The placentas of smokers had microscopic evidences of underperfusion from the uterus. The placental abnormalities were influenced by both the number of years mothers had smoked and by their current smoking habits.

Arteries↗
PubMed1979

Congenital diaphragmatic hernia. New concept in management.

The newborn infant with a congenital diaphragmatic hernia (CDH) who develops severe respiratory distress requiring operative repair within the first 24 hours of life represents one of the most challenging problems in pediatric surgery. The mortality in these infants still exceeds 50% and has historically been attributed to ventilatory insufficiency secondary to pulmonary hypoplasia. However, the primary abnormality in these neonates seems to be an increase in pulmonary vascular resistance with an elevation of pulmonary artery pressure, right-left ductal shunting, preductal shunting and progressive hypoxemia. Eighteen neonates with a CDH were operated upon within the first 24 hours of life with a mortality of 38%. In no instance did ventilatory insufficiency seem to be a major factor in the death of the patient. Seven infants with progressive hypoxemia were treated with a vasodilator, tolazoline. Six of the seven infants showed an initial response to treatment, with a rise in preductal PaO2 and a decrease in ductal shunting. Four of these seven desperately ill neonates survived. Pathologic examination of the pulmonary vasculature in the non-survivors revealed an increase in muscle mass within the pulmonary arterioles. An exaggerated vasoconstrictive response of an abnormally hypertrophied pulmonary vascular bed leading to an elevation of pulmonary vascular resistance, rather than abnormalities of ventilation, appears to be the important mechanism leading to the often fatal hypoxemia observed in the neonate with a CDH. Improved survival will depend upon the successful management of the deranged pulmonary vascular hemodynamics seen in these infants.

Female↗
PubMed1979

Underlying disorders responsible for the neonatal deaths associated with low Apgar Scores.

Data from a large study were used to determine the frequency of fatal disorders associated with low Apgar scores. 5-min scores had the best correlation with mortality rates. Death rates were more than ten times greater with abnormal than with normal 5-min scores. This difference was only 3-fold for 1-min values. Amniotic fluid infections were responsible for nearly half of the deaths in preterm and 24% of the deaths in term neonates with 5-min Apgar scores 0--6. The respective values for disorders that cause antenatal hypoxia were 25 and 24% and for major congenital anomalies, 7 and 28%.

Abruptio Placentae↗
PubMed1979

Perinatal death due to abruptio placentae in an African city.

Abruptio placentae was a common cause of perinatal death in Addis Ababa, Ethiopia in 1974-1975 with a frequency of 5.5/1000 births. This disorder had its peak frequency at term. No abnormalities were found in the placentas to explain the placental abruptions but there were other clues to their genesis. There was a strong association of the fatal abruptions with severe poverty in the mothers. These poor mothers were both undernourished and malnourished during pregnancy. Their fetuses and neonates who died had multiple evidences of undernutrition including a relative undergrowth of adrenals, spleens and livers and a relative acceleration of lung maturation. These findings support observations in more prosperous nations that poor nutrition of the gravida may have an important role in the genesis of abruptio placentae.

Abruptio Placentae↗
PubMed1979

Reliability factors of delivery due dates.

This study attempted to identify the factors that are most important in establishing accurate pregnancy due dates. It quantitated the influence of many factors that affect the duration of pregnancy, as calculated from the last menstrual period, with data from a large prospective study. To limit the influence of maternal constitutional factors, analyses were conducted on the differences between the durations of repeat pregnancies in the same mothers. The mean difference between the calculated durations of successive pregnancies in 4,599 mothers was 18 days. This difference was reduced to 10 days when the pregnancies had been planned and the dates of the last menstrual period had been recorded in the first trimester of pregnancy. Many other factors, including maternal and fetal disorders, significantly altered the length of individual pregnancies but had no significant influence on the overall duration of pregnancies in the study.

Female↗