Termination of pregnancy among very preterm births and its impact on very preterm mortality: results from ten European population-based cohorts in the MOSAIC study.

OBJECTIVE: To study the impact of terminations of pregnancy (TOP) on very preterm mortality in Europe. DESIGN: European prospective population-based cohort study. SETTING: Ten regions from nine European countries participating in the MOSAIC (Models of OrganiSing Access to Intensive Care for very preterm babies) study. These regions had different policies on screening for congenital anomalies (CAs) and on pregnancy termination. POPULATION OR SAMPLE: Births 22-31 weeks gestational age. METHODS: The analysis compares the proportion of TOP among very preterm births and assesses differences in mortality between the regions. MAIN OUTCOME MEASURES: Pregnancy outcomes (termination, antepartum death, intrapartum death and live birth) and reasons for termination, presence of CAs and causes of death for stillbirths and live births in 2003. RESULTS: Pregnancy terminations constituted between 1 and 21.5% of all very preterm births and between 4 and 53% of stillbirths. Most terminations were for CAs, although some were for obstetric indications (severe pre-eclampsia, growth restriction, premature rupture of membranes). TOP contributed substantially to overall fetal mortality rates in the two regions with late second-trimester screening. There was no clear association between policies governing screening and pregnancy termination and the proportion of CAs among stillbirths and live births, except in Poland, where neonatal deaths associated with CAs were more frequent, reflecting restrictive pregnancy termination policies. CONCLUSION: Proportions of TOP among very preterm births varied widely between European regions. Information on terminations should be reported when very preterm live births and stillbirths are compared internationally since national policies related to screening for CAs and the legality and timing of medical terminations differ.

The role of genetic factors in the pathogenesis of neonatal intraventricular hemorrhage.

Intraventricular hemorrhage (IVH) affects 15-20% of babies born before 32 weeks of pregnancy. Besides gestational age (below 32 weeks) there are a number of IVH risk factors. Increasing attention is being paid to genetic factors in the development of IVH. The authors discuss genetic factors (mutations of coagulation factors, gene polymorphisms in pro-inflammatory cytokines, mutation of type IV collagen gene, polymorphisms of genes responsible for the regulation of systemic blood pressure and cerebral blood flows) whose involvement in IVH pathogenesis has been confirmed in the highest number of reports and for which being a carrier plays an important role in their pathophysiology. The role of genetic factors in IVH remains unclear. Further analysis of the role of genetic factors in the pathophysiology of IVH will make it possible to determine the group of newborns who are specifically at risk of developing IVH in the perinatal period.

Pulmonary function after surfactant lung lavage followed by surfactant administration in infants with severe meconium aspiration syndrome.

OBJECTIVE: The effect of surfactant lung lavage (SLL) on pulmonary function was examined in neonates with severe form of meconium aspiration syndrome (MAS) (mean +/- standard deviation: birth weight, 3178.1 +/- 237.6 g; gestational age, 37.7 +/- 1.8 weeks). METHODS: The infants were on mechanical ventilation and were subjected to SLL with Survanta. Dynamic compliance (Cdyn), airway resistance (Raw) and mean airway pressure (MAP) were obtained with use of the pneumotachometric method. Measurements of Cdyn, Raw, MAP and time constant (Tc) were compared in the study and control groups and between the groups before SLL and 24 and 48 h after SLL. RESULTS: A significant increase in Cdyn (from 1.06 +/- 0.23 to 2.12 +/- 0.99 (ml/cmH(2)O)/kg) (p < 0.05) and a drop in both Raw (from 264.7 +/- 41.5 to 146.6 +/- 39.4 (cmH(2)O/l)/s) and MAP (from 12.4 +/- 3.6 to 5.4 +/- 2.1 cmH(2)O) were observed 48 hours after SLL. CONCLUSIONS: These data suggest that SLL is associated with a rapid and significant improvement in pulmonary mechanics, together with an improvement in oxygenation, in newborns with severe MAS. We found that the beneficial effects of SLL on pulmonary mechanics persisted for at least 48 h after introduction of the procedure.

[The influence of iodine deficiency during pregnancy of fetal and neonatal development]. / Wplyw niedoboru jodu w ciazy na rozwój plodu i noworodka.

The iodine is fundamental substrate for thyroid hormones synthesis. Thyroxine and triiodothyronine play a crucial role in human brain development and maturation. It is well known, that not only fetal, but also maternal thyroid hormones are essential for normal prenatal central nervous system development. During pregnancy complex changes of maternal thyroid function occur and they are influenced by the maternal iodine supply. With decreasing iodine intake, maternal goiter and hypothyroxinemia as well as fetal and neonatal hypothyroidism become more prevalent. The severity of iodine deficiency and hypothyroidism in the mother during early and midgestation is related to the severity of the neural damage in the fetus. In severe iodine deficiency, central nervous system damage is already irreversible at birth and can only be prevented by correction of the maternal iodine deficiency early in pregnancy. Therefore iodine supplementation during pregnancy is now strongly recommended.

[Evaluation of treating neonates with surfactants for respiratory distress syndrome. I. Importance of gas exchange]. / Ocena leczenia surfaktantem noworodków z zespolem zaburzen oddychania. I. Wplyw na wymiane gazowa.

Twenty seven preterm babies enrolled in a European Multicentre Trial (Curosurf 4) were treated with surfactant Curosurf (Chiesi Farmaceutici, Italy). Mean gestational age was 30.7 weeks (range 26-36), and mean birthweight 1617 g (960-2790 g). Curosurf was given as a rescue therapy in babies with severe RDS between 2-72 hours after birth. Indications for treatment were: clinical and radiological diagnosis of RDS, need for mechanical ventilation and arterial to alveolar oxygen tension ratio < 0.22. Umbilical arterial catheterisation and written parental consent were obtained before trial entry. The results are given for all treated babies and have not been analysed according to the dose of Curosurf. In the first hour after treatment there were mean increases in PaO2 of 27.4 mm Hg (3.6 kPa), and oxygen saturation of 8.2%, a mean decrease in PaCO2 of 15.0 mm Hg (3.3 kPa) and mean increases a/A ratio of 0.1. It was possible to reduce mechanical ventilation one hour after Curosurf instillation: inspired oxygen concentration was decreased by a mean of 12.3%, peak inspiratory pressure by 4.3 cm H2O, and frequency by a mean of 5.6 per minute. It is concluded that there are immediate beneficial effects of Curosurf in preterm babies with severe RDS.

[Usefulness of transcutaneous measurements of bilirubin in infants with jaundice]. / Przydatnosc przezskórnych pomiarów bilirubiny u noworodków z zóltaczka.

Traditionally, in neonatal jaundice, diagnosis is based on repetitive serum bilirubin measurements. The aim of this study was to analyse clinical usefulness of transcutaneous bilirubinometry as a noninvasive screening test in evaluating neonatal jaundice. The material consisted of 106 full-term infants in which 130 meter readings were performed. A Minolta/Air Shields Jaundice Meter 101 was used. Meter readings were compared with serum bilirubin measurements from these infants (correlation ratio was 0.56). After analysing the clinical data, the conclusion was, that transcutaneous bilirubinometer is a useful instrument for assessing neonatal jaundice for clinical purposes. The bilirubinometer can effectively identify infants whose degree of jaundice the need for serum bilirubin determination and can prevent unnecessary repetitive blood sampling in infants not requiring serum bilirubin determination.

[Effects of surfactant administration in neonates with respiratory distress syndrome. II. Radiographic changes]. / Ocena leczenia surfaktantem noworodków z zespolem zaburzen oddychania. II. Obraz radiologiczny.

The effect of treatment of severe respiratory distress syndrome with a natural porcine surfactant (Curosurf) on the radiographic appearances and degree of aeration is described. Separate assessment of each lung of 22 preterm babies was made before and after surfactant administration. The beneficial effect of Curosurf treatment on the aeration of the lungs was seen in 19 (86%) of the babies.

[Evaluation of surfactant administration in neonates with respiratory distress syndrome. III. The role of intra-uterine stimulation on lung maturity]. / Ocena leczenia surfaktantem noworodków z zespolem zaburzen oddychania. III. Rola wewnatrzmacicznej stymulacji dojrzalosci pluc.

Prenatal corticosteroids and exogenous surfactant therapy independently reduce the adds of neonatal death by about 40%. It is not clear however if babies who develop RDS despite prenatal corticosteroid therapy behave differently when later given exogenous surfactant. This paper presents an evaluation of the outcome of babies treated with Curosurf (a porcine surfactant) for RDS depending upon whether they received prenatal corticosteroids (16 babies) or not (11 babies). Although not randomised these two groups of babies appear to be similar in respect of gestational age. However, lower mortality was found in the group treated with prenatal corticosteroids (12.5% vs. 27.2%).

[Evaluation of ambroxol given prenatally and postnatally on gas exchange in the newborn with respiratory distress syndrome]. / Ocena wplywu ambroksolu podawanego prenatalnie i pourodzeniowo na wymiane gazowa u noworodka z zespolem zaburzen oddychania.

160 newborns were observed to compare the influence of combine treatment with ambroxol (Lasolvan-Boehringer Ingelheim) (antenatal and postnatal) versus postnatal administration of this drug on gas exchange and reduction of ventilatory settings in newborns with RDS. In 53% of cases the preparation was given both: pre- and postnatal and 47% of newborns were treated only postnatal. The results of stimulation of lung maturity "before and after" versus "after" delivery were better in the first group, however in some parameters we did not found statistical differences.

[Comparison of mortality and morbidity in newborns treated with ambroxol prenatally and postnatally]. / Porównanie smiertelnosci i zachorowalnosci noworodków leczonych Ambroksolem prenatalnie i pourodzeniowo.

The effect of Ambroksol given pre- and postnatal on infant mortality and morbidity was performed. In particular we found a statistically significant differences in reduction of mortality in the group A treated with Ambroksol pre- and postnatal vs. group B treated only postnatal. The other parameters of morbidity had no significantly importance but sepsis, which was more often diagnosed in group A than in group B (17.5% vs. 11.1%). We connect this fact with higher frequency of PROM in the group A.

Monitoring diaphragm electrical activity and the detection of congenital central hypoventilation syndrome in a newborn.

A full-term newborn infant is described with recurrent episodes of oxygen desaturation and apnea on the day of birth. The apnea did not improve with continuous positive airway pressure (CPAP) and intermittent nasal ventilation, therefore intubation and mechanical ventilation were required. A preliminary diagnosis of congenital central hypoventilation syndrome (CCHS) was made with the use of simultaneous measurements of end-tidal CO2 (EtCO2) and a diaphragm electrical activity waveform that was detected using microsensors placed on the infant's feeding tube. It was observed that during deep sleep, the diaphragm electrical activity waveform was close to 0 µV (central apnea) and EtCO2 levels rose accordingly (central hypoventilation). Genetic testing subsequently revealed a Phox2b mutation, establishing the diagnosis of CCHS. Simultaneously measuring diaphragm electrical activity and EtCO2 is feasible and may be a valuable bedside diagnostic tool in cases of suspected CCHS before the diagnosis is confirmed with genetic testing.

The impact of assisted reproductive technologies on the genome and epigenome of the newborn.

The question of genetic alterations resulting from assisted reproductive technologies (ART) in humans is examined within the organization of the human genome. Increased rates of birth defects have been reported among children conceived using ART; however, questions remain and controversy exists regarding how "infertility" predisposes to birth defects. ART has been shown to be associated with an increased number of chromosomal alterations especially in the X chromosome. There is increased risk for embryonal tumors among ART conceived children, as well as, imprinting disorders (Beckwith-Wiedemann and Angelman Syndromes). Genetic studies of children conceived using ART reveal a larger (genome-wide) scale of methylation defects that encompass hundreds of genes. Genes involved in carcinogenesis and developmental pathways appear altered and may impact on later development of chronic illness, although these data are very preliminary. ART may create novel mutations by different chromosomal and molecular mechanisms; however, these techniques also enable propagation of pre-existing mutations that are associated with impaired fertility. While older maternal age is often associated with female infertility and chromosomal aneuploidy, sperm from older men have more new gene mutations. The prevalence of birth defects is increased when ART is used for conception. These data are summarized by large meta-analyses or from multi-year national registries. Whether the increased number of birth defects is due to ART procedures themselves or are a consequence of the impaired fertility of the parents is discussed. Long-term evaluation of children conceived using ART and/or ovarian hyper-stimulation is needed to determine whether alterations during embryonic development may increase the prevalence of chronic diseases in adulthood.

Neurological and developmental disabilities in ELBW and VLBW: follow-up at 2 years of age.

OBJECTIVE: To establish the prevalence of neurodevelopmental disabilities among premature infants born in western Poland. STUDY DESIGN: From 1999 to 2003, 640 extremely low birth weight (ELBW) and 777 very low birth weight (VLBW) infants were admitted to the tertiary care center in Poland. Discharged home were 302 and 671 of them, respectively. At 2 years corrected age, 165 ELBW and 285 VLBW children were diagnosed with neurosensory abnormality including cerebral palsy (CP) and evaluated with Bayley Scales of Infant Development II. RESULT: Mental developmental index (MDI) score <70 was recorded in 104 children (23.1%). There were 75 (16.7%) cases of CP, 8 (1.7%) deafness/hearing loss, 22 (4.8%) blindness and 14 (3.1%) of epilepsy. Patients with abnormal neurosensory status had significantly lower MDI compared with those with normal development (83.8±9 vs 54.7±10). Severe intraventricular haemorrhage, periventricular leucomalacia, ventricular dilatation and hydrocephalus were the most important risk factors for neurologic abnormality. CONCLUSION: Severe disability is more common among ELBW compared with VLBW infants and remains a major challenge for health-care providers.