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Background: Perinatal period begins at 22 gestational weeks and ends seven days after birth. Perinatal mortality is an important quality indicator of the obstetric and pediatric care available, and representative of the population's health service., Objective: To know fetal, early neonatal, and perinatal dead rates, and them main mortality causes., Patients and Methods: Descriptive and retrospective study at IMSS's no. 32 UMAE (Monterrey, Nuevo León, México), from January 2002 to December 2006. Mortality rates during fetal and perinatal, or neonatal periods, were estimated per 1,000 births or 1,000 live born, respectively., Results: There were 1,681 deaths: 747 stillbirths and 934 neonatal. Two hundred and nineteen (29.3%) stillbirths had 22 to 27 gestational weeks, and 528 (70.6%) had 28. Three hundred and sixty neonatal deaths (38.5%) occurred before 27th gestational week, 320 (34.2%) between weeks 28th and 35th, and 254 (27.1%) after 36 weeks of pregnancy. Seven hundred and sixty four neonates died within 0 to 6 days of life, and 170 (18%) between seventh to 28th days of life. Fetal, neonatal, early neonatal, and late neonatal mortality rates were 7.2 in 1,000 births, 9.08 in 1,000 live born, 7.42 in 1,000 live born, and 1.65 in 1,000 births, respectively, and overall perinatal mortality rate was 14.58 in 1,000 births., Conclusions: Stillbirth, early neonatal, and perinatal mortality rates of this study were under national mean. Main mortality causes (70%) were congenital defects and prematurity.

Introduction: The prevalence of congenital cardiac defects is 8 per 1000 neonates, and it's different if high or low risk populations are studied. The fetal ultrasonographic increase prenatal detection but varies from 7 to 90%., Objectives: To know the prevalence of fetal cardiopathy and detection in high risk pregnancies., Patients and Methods: A observational study was made in pregnancies women with 16 old week of gestation., Results: We received a total of 3500 high-risk pregnancies and were detected 112 cases with fetal cardiopathy (3.2%). The 30% of them had a risk factor of cardiopathy. The most frequent fetal cardiac defect detected were arrhythmia in 34 fetus, septal defects in 30, valvular defects in 17, hypoplasic or absence of cardiac cavities 16, tronco-conus defects 8, and other 7 included ectopia cordis 3, cardiac tumor 2, abnormal drainage of pulmonary veins 2. The diagnosis increased every year since started study. The prenatal diagnoses suspected in fetal echocardiography were confirmed in 80% of the cases in neonatal period., Conclusion: The detection rate of fetal cardiac defect was 3.2% in high-risk pregnancies, four times higher than general population prevalence of congenital heart disease. We found a 30% overall perinatal mortality in fetal cardiac defect. The most frequent fetal cardiac defects found in this screening were arrhythmias and septal ventricular defects in almost 50% of patients.