MYOCARDIAL-INFARCTION AND CARDIOVASCULAR RISK-FACTORS IN MEXICO-CITY AND SAN-ANTONIO, TEXAS

Because the epidemiology of cardiovascular disease in Mexico is largel y unknown, we examined the prevalence of cardiovascular risk factors a nd myocardial infarction (MI) in adults from low-income colonias in Me xico City. Data were collected as part of the Mexico City Diabetes Stu dy, a population-based survey of diabetes and cardiovascular disease c onducted between 1987 and 1992. Results were compared with those obtai ned from a comparable survey conducted previously among low-income Mex ican Americans in San Antonio, Tex. A total of 2271 individuals betwee n the ages of 35 and 64 years from Mexico City and 1143 adults of the same age range from San Antonio were studied. Despite being leaner and having lower levels of total cholesterol, Mexicans in Mexico City had markedly higher levels of triglycerides (P<.001) and lower levels of HDL cholesterol (P<.001) than Mexican Americans in San Antonio. MI was assessed by Minnesota-coded electrocardiograms and by a self-reported history of physician-diagnosed heart attack. In men, the prevalence o f self-reported heart attack was significantly higher in San Antonio t han in Mexico City (odds ratio, 5.85; P<.001), and in women, the preva lence of electrocardiogram-documented MI was significantly higher in S an Antonio than Mexico City (odds ratio, 2.51; P<.001). The apparent e xcess of MI in San Antonio relative to Mexico City could be due to hig her case-fatality in Mexico City or to a higher incidence in San Anton io.