[Perinatal morbimortality].

Between 1972 and 1975 (4 years), the Hospital de Ginecoobstetricia "Dr. Ignacio Morones Prieto" of the I.M.S.S. at Monterrey, N.L., reported a birth rate of 106, 771 with 98.35% (105,004) live borns. The morbidity rate was 262.06/1000 live borns and the perinatal mortality was 31.24/1000, divided into antenatal 16.54/1000 and posnatal 14.70/1000. Within morbidity, prematurity and/or low weight occupies the first place, followed by respiratory pathology and afterwards, jaundice, infections, obstetric trauma and finally, congenital malformations. The neonatal mortality reached 14.70/1000 live borns and if we consider gestational age, 22.9% corresponds to immature products, 50.2% prematures and 26.0% to full-term products. In relation to hours of life, we find that 62.50% of the total number of deaths were reported in products less than 24 hrs. of life and 37.50%, in products over 24 hrs. of life.