[Risk factors to periventricular-intraventricular hemorrhage in newborns weighing less than 2000g]

OBJECTIVE: To study the incidence and analyze risk factors to neonatal periventricular-intraventricular hemorrhage; to suggest a working protocol for diagnosis in newborns at risk.METHODS: This is a cohort prospective study including 120 out of 129 children weighing less than 2000g born from May 18 th, 1994 to May 17 th,1995 at the Hospital das Clínicas da UFMG. The study group comprised 39 newborns with the ultrasound diagnosis of periventricular-intraventricular hemorrhage; the control group comprised 81 newborns who although submitted to the same evaluation protocol did not show any echographic signs of hemorrhage. The ultrasound examinations were all done by the same researcher who was not aware of the clinical history or the neurologic and laboratory examinations. The hemorrhage was classified according to Papilés criteria: grade I (13%); grade II (7%); grade III (9%) and grade IV (3%).RESULTS: Low gestational age, low birth weight, masculine sex, vaginal delivery, and neonatal sepsis were significantly associated (p < 0.05) with periventricular-intraventricular hemorrhage in univariate analysis. Apgar score in the first or fifth minute and Battagliás and Lubchenkós classification for the weight in relation to gestational age were not predisposing factors to the hemorrhage. Low gestational age (p = 0.002), vaginal delivery (p = 0.037), and masculine sex (p = 0.016) kept statistical significance after multivariate adjustment. Birth weight may substitute for gestational age in the multivariate model because they are highly associated. The best cutoff point to screen for periventricular-intraventricular hemorrhage was 1750 g instead of the traditionally adopted point of 1500 g. CONCLUSIONS: The incidence of neonatal periventricular-intraventricular hemorrhage was similar to those reported by other studies. Low gestational age or low birth weight, vaginal delivery and masculine sex were the most important risk factors to the hemorrhage. The screening cutoff point of 1750 g seems to be more adequate than the commonly used birth weight of 1500 g.