Background And Objective: The magnitude of the problem of myocardial infarction (MI) is better understood by assessing the population case-fatality than by analyzing only the number of patients attending hospitals.
Patients And Method: Our data come from the IBERICA Study (Investigation, Specific Search and Registry of Acute Myocardial Ischemic Syndrome). Twenty eight-day MI population case-fatality is described in the population aged 25 to 74 years during 1997 and 1998 in the following Spanish autonomous communities: Castilla-La Mancha (Toledo and Albacete), Catalonia (Girona), Valencia Community (Valencia), Balearic Islands (Majorca), Murcia, Navarra and Basque Country. The relationship between case-fatality and other variables such as sex, age and geographic area is also analyzed.
Results: A total of 10,660 MI cases were registered, 4,106 of whom died within the period of 28 days following the onset of symptoms (38.5%; CI 95%, 37.6-39.4%). The overall case-fatality was 37.0% (CI 95%, 35.9-38.0%) in men and 44.3% (CI 95%, 42.3-46.4%) in women. Death occurred out of hospitals in 2,869 (69.9%) cases. An increased case-fatality in women was associated with a higher in-hospital case-fatality (45% higher than men). The proportion of patients who died before reaching a hospital was similar in both genders. Classical symptoms of MI were more common among men than women (82.7% vs. 77.6%, p < 0,001). The interval between symptoms' onset and hospitalization was 30 minute longer among hospitalized women as compared with men (p < 0,001).
Conclusions: Population MI case-fatality is high in the seven Spanish autonomous communities studied. Approximately 2 out of 3 deaths occur without patients being able to reach a hospital. These results emphasize the importance of primary and secondary prevention measures and the necessity to design ready-access systems to defibrillation and resuscitation manoeuvres for patients with cardiopulmonary arrest.
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