A study of 1,781 R.N.V. Product of 1,752 vaginal births attended at the Maternity Hospital of support No. 3 - Health - Chepén in the period from January 1, 1990 to December 31, 1992; Selecting 73 stories corresponding to R.N. With APGAR less than 7 a minute and five minutes, according to the inclusion criteria; Which were compared with a random sample of 177 R.N. Whose APGAR a minute score was 7 to 10; With the objective of determining the incidence of perinatal asphyxia according to degree of severity, identify risk factors (maternal, fetal and mechanical) through relative risk, associated complications and specific mortality of perinatal asphyxia in the last 3 years. The incidence of perinatal asphyxia found is similar to that of other authors. The relative risk of maternal, fetal and mechanical factors in vaginal delivery was found to be the most significant to non-prenatal control, ...