, análise de variância, teste de Kruskal-Wallis, razão de risco com intervalo de confiança (IC) e regressão logística múltipla, com significância em 5%. RESULTADOS: A coorte compreendeu 198 prematuros, sendo G25=59, G28=43 e G30=96. O risco de óbito foi significativamente maior em G25 e G28, em relação ao G30 (RR=4,1; IC95% 2,2-7,6 e RR=2,8; IC95% 1,4-5,7). A sobrevida encontrada foi, respectivamente, 52,5, 67,4 e 88,5%. A partir da 26ª semana e peso ≥700 g, a sobrevida foi superior a 50%. A morbidade foi inversamente proporcional à idade gestacional, exceto para enterocolite necrosante e leucomalácia, que não diferiram entre os grupos. A análise de regressão logística mostrou que a hemorragia pulmonar (OR=3,3; IC95% 1,4-7,9) e a síndrome do desconforto respiratório (OR=2,5; IC95% 1,1-6,1) foram fatores independentes de risco para óbito. Houve predomínio das lesões cerebrais hemorrágicas graves em G25. CONCLUSÕES: Sobrevivência superior a 50% ocorreu a partir da 26ª semana de gravidez e peso ≥700 g. A hemorragia pulmonar e a síndrome do desconforto respiratório foram preditores independentes de óbito. Há necessidade de identificar e instituir práticas para melhorar a sobrevida de prematuros extremos. Abstract PURPOSE:To evaluate the survival and complications associated with prematurity of infants with less than 32 weeks of gestation. METHODS: It was done a prospective cohort study. All preterm infants with a gestational age between 25 and 31 weeks and 6 days, born alive without congenital anomalies and admitted to the NICU between August 1 st , 2009 and October 31 st , 2010 were included. Newborns were stratified into three groups: G25, 25 to 27 weeks and 6 days; G28, 28 to 29 weeks and 6 days; G30, 30 to 31 weeks and 6 days, and they were followed up to 28 days. Survival at 28 days and complications associated with prematurity were evaluated. Data were analyzed statistically by c 2 test, analysis of variance, Kruskal-Wallis test, odds ratio with confidence interval (CI) and multiple logistic regression, with significance set at 5%. RESULTS: The cohort comprised 198 preterm infants (G25=59, G28=43 and G30=96). The risk of death was significantly higher in G25 and G28 compared to G30 (RR=4.14,). Survival was 52.5%, 67.4% and 88.5%, respectively. Survival was greater than 50% in preterm >26 weeks and birth weight ≥700 g. Neonatal morbidity was inversely proportional to gestational age, except for necrotizing enterocolitis and leukomalacia, which did not differ among groups. Logistic regression showed that pulmonary hemorrhage (OR=3.3, 95%CI 1.4-7.9) and respiratory distress syndrome (OR=2.5, 95%CI 1.1-6.1) were independent risk factors for death. There was a predominance of severe hemorrhagic brain lesions in G25. CONCLUSION: Survival above 50% occurred in infants with a gestational age of more than 26 weeks and ≥700 g birth weight. Pulmonary hemorrhage and respiratory distress syndrome were independent predictors of neonatal death. It is necessary to identify the best practices to improve the survival of extrem...
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