Objective: To determine whether the acceleration/ejection time ratio of the fetal main pulmonary artery Doppler waveform (PATET) can accurately predict the results of fetal lung maturity testing in amniotic fluid. Methods: We prospectively studied pregnant women attending our ultrasound unit for clinically indicated fetal lung maturity testing. An ultrasound examination that included measurement of the PATET was performed before the results of the amniocentesis were reported. The results of the PATET and the surfactant/albumin ratio were compared, and a receiver operating characteristic curve was used to determine the PATET cutoff with the optimal sensitivity and specificity for predicting surfactant/albumin ratio results. p < 0.05 was considered statistically significant. Results: Forty-three patients were included in this study. The receiver operating characteristic curve demonstrated that a PATET cutoff of 0.3149 provided a specificity of 93% (95% CI 77-98%), a sensitivity of 73% (95% CI 48-89%), a negative predictive value of 87% (95% CI 70-95%), and a positive predictive value of 85% (95% CI 58-96%) for predicting immature surfactant/albumin ratio results. Conclusion: The PATET may provide a noninvasive means of determining fetal lung maturity with acceptable levels of sensitivity, specificity, and predictive values.

Introduction Placental abruption is a serious condition that increases perinatal morbidity and mortality. Clinical prevention and treatment options are limited, especially in human preterm deliveries. Knowledge of the mechanisms that keep the placenta in place during pregnancy is critical for developing strategies for the prevention of abruption. Failure of physiological transformation of spiral arteries has been described as a major contributing factor of the placental abruption development. Baboons (Papio spp.) share striking similarities with humans in regard to placental structure, utero-placental blood flow, and fetal development; however, the mode of trophoblast invasion is shallow in baboons. This fact prompted the hypothesis that the incidence of placental abruption will be increased in baboons compared to humans. Material and methods Baboon placentas were collected between 2002 and 2008. Two independent veterinary pathologists evaluated the slides. A certified physician pathologist performed additional histology. Results Placental abruption was diagnosed in 22 baboons among 2,423 live births during the study period (0.9% prevalence). The most common clinical presentations were fetal demise and vaginal bleeding. The most common pathological findings were intraplacental hemorrhage with or without hematoma formation (86.4%). Other findings consisted of neutrophil infiltration (50%), decidual necrosis (22.7%), decidual vascular congestion and inflammation, villous congestion and retroplacental hemorrhage/hematoma (18.2%). These pathologic findings were the same for term and preterm deliveries. Conclusion This is the first systematic study of placental abruption in non-human primates, analyzing a large colony of baboons. Despite differences in trophoblast invasion, the clinical features observed in placental abruption affecting baboons resembled those reported in humans. The cluster of placental pathological findings in baboons also agreed with clinical reports, but the prevalence of these findings differed between baboons and humans. We discuss a mechanism of anti-abruption forces that offset shallow trophoblast invasion observed in baboons.

Introduction: Percutaneous fetoscopic endoluminal reversible tracheal occlusion (FETO) was developed to prevent the pulmonary complications of fetal congenital diaphragmatic herniation. There is an urgent need to establish the closest to human translational model of FETO in order to improve fetal outcomes and to determine new clinical approaches and applications. Material and Methods: Seven non-human primates underwent two subsequent surgeries: the first, the FETO in the experimental group (n = 3) or sham operation in the control animals (S-FETO, n = 4) at 132-142 days of gestation (dGA); the second, the reversal of occlusion or sham operation at 162 ± 5 dGA. Maternal stress axis, complete blood count, and biochemical parameters were evaluated and newborn tracheal radiography was performed. Results: The average pregnancy duration and neonatal weights in the FETO group did not differ from the animals in the S-FETO group. There was no bleeding or premature fetal membrane rupture during the procedures in any of the baboons. The maximal tracheal width was 7.02 ± 0.6 mm in the FETO versus 5.46 ± 0.6 mm in S-FETO group. Discussion: This is the very first report of a successful FETO model in non-human primates. Similarities to human tracheomegaly were for the first time documented in any model studied.

We studied the independent role of air pollution and passive smoking on respiratory symptoms and group of symptoms by following 46 adult nonsmokers for 14 wk. Outcomes included the incidence of 15 symptoms. After adjustment for passive smoking, clear rhinorrhea and cough were positively related to nitrogen dioxide (NO2), particles (PM10), and black smoke (BS); whereas headache was positively related to BS. Sneezing, sore throat, and cough were independently positively related to passive smoking. After adjustment for passive smoking, the occurrence of groups of symptoms and of the "sore throat group" were related to three pollutants. The occurrence of the "possible infection group" was positively related to BS. The occurrence of every group of symptoms was independently related to passive smoking. In conclusion, the prevailing levels of air pollution and passive smoking had independent effects on symptoms and groups of symptoms.

Introduction More than one-fourth of U.S. women are overweight; more than one-third are obese. Maternal obesity has been linked to an increased incidence of stillbirths, fetal macrosomia, fetal intrauterine growth restriction and pre-eclampsia. The placenta plays a key role in the nutrients and oxygen supply to the fetus. The data about structural changes in the placental villous membrane (VM), a major component of the feto-maternal nutrient and oxygen exchange barrier, during obesity are sparse and inconsistent. Our objective was to evaluate the morphometric changes in the placental exchange barrier in a baboon model of obesity. Materials and methods The previously described baboon model of maternal obesity was studied. We compared 4 obese to 4 non-obese baboons. Placental stereology with the use of transmission electron microscopy was performed to estimate VM oxygen diffusing capacities and morphometry. Results The specific placental oxygen diffusing capacities per unit of fetal weight were similar in baboons and humans. Maternal leptin concentrations correlated negatively with placental basement membrane thickness (r = −0.78, p < 0.05), while fetal leptin levels correlated negatively with endothelial thickness of fetal capillaries (r = −0.78, p < 0.05). The total and specific villous membrane oxygen diffusing capacities were not different between the two groups. Conclusion To the best of our knowledge this is the first report of placental oxygen diffusing capacities and placental ultrastructural changes in a baboon model of obesity. Previously reported placental inflammation in maternal obesity is not associated with changes in the VM diffusing capacities and ultrastructure.