Estresse oxidativo em recém-nascidos de mães hipertensas: relação com prognóstico neonatal no curto prazo
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Data
2010-07-27
Autores
Sá, Milene Piorkowsky Almeida de [UNESP]
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Universidade Estadual Paulista (Unesp)
Resumo
A pré-eclâmpsia é uma das complicações gestacionais mais freqüentes e o radical livre óxido nítrico (NO) pode estar envolvido na fisiopatologia desta doença. O excesso de radicais livres pode gerar estresse oxidativo que contribui para a ocorrência de várias doenças neonatais, porém, a relação pré-eclâmpsia / estresse oxidativo /óxido nítrico/ doenças neonatais não está bem definida. Investigar se os níveis de NO na placenta e no recém-nascido caracterizam o estresse oxidativo na pré-eclâmpsia e relacionam-se com a morbidade e prognóstico neonatal. Estudo observacional de prematuros menores que 34 semanas de mães com pré-eclâmpsia, pareados pela idade gestacional com prematuros de mães normotensas, nascidos na Maternidade do HC da Faculdade de Medicina de Botucatu – UNESP, entre julho de 2008 e dezembro de 2009. Óxido nítrico foi dosado em placenta, sangue de cordão umbilical, urina do primeiro dia de vida, sangue e urina do recém-nascido no 4º dia. As variáveis bioquímicas e clínicas, de nascimento e neonatais foram comparadas nos 2 grupos: Pré-eclâmpsia e Normotensas. Foram estudados 30 prematuros de mães com pré-eclâmpsia e 30 de mães normotensas, com idade gestacional de 30 ± 2 semanas. Não houve diferença nas condições de nascimento e na morbimortalidade dos prematuros, mas os filhos de mães com pré-eclâmpsia tiveram maior necessidade de surfactante e ventilação mecânica. Os níveis séricos e urinários de NO não diferiram nos 2 grupos, sendo significativamente mais baixos na placenta do que no sangue de cordão e dos recém-nascidos. A pré-eclâmpsia foi grave em 40% dos casos, mas mesmo nestes os níveis de NO não diferiram. Na pré-eclâmpsia os níveis placentários e neonatais de NO não diferiram e não se relacionaram com a morbidade e o prognóstico neonatal
Pre-eclampsia is one of commost complication of preganacy and the free radical nitric oxide (NO) may be enrolled in the pathophysiology of the disease. Excessive levels of free radicals can produce oxidative stress contributing to the development of several neonatal diseases. However the pre-eclampsia/oxidative stress/NO/neonatal diseases relationship has not been well established. To investigate whether NO levels in the placenta and in newborns characterize oxidative stress in pre-eclampsia and whether they are related to morbidity and neonatal prognosis.Observational study on preterm newborns, younger than 34 week, of mothers with pre-eclampsia, paired by gestational age with preterm newborns from normotensive mothers and born at the University Maternity Hospital of the Botucatu School of Medicine - UNESP from July 2008 to December 2009. Nitric oxide was dosed in the placenta, umbilical-cord blood, first-day-of-life urine and the newborn’s fourth-day urine and blood. Biochemical and clinical variables from birth and the newborn, were compared in the 2 groups: Pre-eclampsia and Normotensive. Thirty preterm newborns of mothers with pre-eclampsia and 30 newborns of normotensive mothers with gestational age of 30 ± 2 weeks were studied. There was no difference in birth conditions or morbidity and mortality of preterm newborns, but the offspring of mothers with pre-eclampsia required more surfactant and mechanical ventilation. Serum and urine NO levels did not differ in the two groups and were significantly lower in the placenta than in umbilical-cord blood and in newborns. Preeclampsia was severe in 40% of cases, but even in those, NO levels did not differ. In pre-eclampsia, placental and neonatal NO levels did not differ and were not related to neonatal morbidity or prognosis
Pre-eclampsia is one of commost complication of preganacy and the free radical nitric oxide (NO) may be enrolled in the pathophysiology of the disease. Excessive levels of free radicals can produce oxidative stress contributing to the development of several neonatal diseases. However the pre-eclampsia/oxidative stress/NO/neonatal diseases relationship has not been well established. To investigate whether NO levels in the placenta and in newborns characterize oxidative stress in pre-eclampsia and whether they are related to morbidity and neonatal prognosis.Observational study on preterm newborns, younger than 34 week, of mothers with pre-eclampsia, paired by gestational age with preterm newborns from normotensive mothers and born at the University Maternity Hospital of the Botucatu School of Medicine - UNESP from July 2008 to December 2009. Nitric oxide was dosed in the placenta, umbilical-cord blood, first-day-of-life urine and the newborn’s fourth-day urine and blood. Biochemical and clinical variables from birth and the newborn, were compared in the 2 groups: Pre-eclampsia and Normotensive. Thirty preterm newborns of mothers with pre-eclampsia and 30 newborns of normotensive mothers with gestational age of 30 ± 2 weeks were studied. There was no difference in birth conditions or morbidity and mortality of preterm newborns, but the offspring of mothers with pre-eclampsia required more surfactant and mechanical ventilation. Serum and urine NO levels did not differ in the two groups and were significantly lower in the placenta than in umbilical-cord blood and in newborns. Preeclampsia was severe in 40% of cases, but even in those, NO levels did not differ. In pre-eclampsia, placental and neonatal NO levels did not differ and were not related to neonatal morbidity or prognosis
Descrição
Palavras-chave
Pre-eclampsia, Recem-nascidos, Oxido nitrico, Oxidative stress, Nitric oxide
Como citar
SÁ, Milene Piorkowsky Almeida de. Estresse oxidativo em recém-nascidos de mães hipertensas: relação com prognóstico neonatal no curto prazo. 2010. 74 f. Dissertação (mestrado) - Universidade Estadual Paulista, Faculdade de Medicina de Botucatu, 2010.