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Objective: The objective of this study is to determine the main causes of maternal mortality in the period 2009 to 2013 in Mexicali, Baja California, Mexico., Material and Methods: Epidemiological, observational, descriptive, cross-sectional, and retrospective study was conducted with a universe of 30 cases of maternal death. The information was collected from death certificates and records of cases obtained from the Institute of State Public Service Health of University Xochicalco., Results: The average age of patients were 26.6 ± 5.6 years. Educational level and marital status was with junior school 15 (50%) and free union 12 (40%) respectively, 21 (70%) had no prenatal care. The mean gestational age was 28.8 ± 3.72 weeks, there was no difference in the place of residence, urban and rural, 15(50%). The main cause of death was hemorrhage 9(30%). The highest mortality was during the postpartum period 23 (77%). During the study period, the mortality rate was 36.8 x 100,000 live births., Conclusions: The increased frequency of maternal mortality was in young women, 70% had no prenatal care. Bleeding from ectopic pregnancy was the leading cause of death.

Background: In 3 to 8% of pregnancies there are preeclampsia, and it is considered an irreversible disease that affects several organs, and causes injuries in fetus and mother alike., Objective: To identify maternal risk factors related to low birth weight in preterm newborns born at Hospital de Ginecología-Pediatría con Medicina Familiar no. 31 from IMSS, at Mexicali, BC, Mexico., Patients and Method: Case-control study (1:2 ratio) made in 114 prematures (38 cases and 76 controls) who were evaluated for socioeconomic and biological maternal risk factors influencing low birth weight in preterm newborns. Odds ratio and confidence intervals of 95% were used to calculate epidemiologic correlation, and logistic regression to specific importance of risks., Results: Preeclampsia persists as a risk factor for low birth weight: OR 3.16 (95% CI 3.15-8.40, p = 0.00). In logistic regression meaningful variables were: preeclampsia 5.27 (95% CI 1.45-19.14, p = 0.01), and in premature newborn: thrombocytopenia 6.0 (95% CI 1.2-11.2, p = 0.00), and neonatal sepsis 4.31 (95% CI 1.73-10.70, p = 0.00)., Conclusions: Preeclampsia was the major risk factor related to low birth weight and was associated with thrombocytopenia in preterm newborn. Neonatal sepsis is secondary to low birth weight. We need to observe and obey prenatal care of pregnant women in our hospital to reduce negative impact of low birth weight in preterm newborns.