[Maternal mortality at the Mexican Institute of Social Security (IMSS). Initial results from a reduction intervention strategy].

Objective: To analyze the preliminary results of a medical manager intervention to improve the quality of medical care during pregnancy, delivery and puerperium, on the maternal mortality rates in population covered by the Mexican Institute of Social Security (IMSS).

Material And Methods: We selected the 14 administrative delegations of IMSS that showed the highest rates and absolute numbers of maternal deaths in the years 1999 to 2001. Within this group, the manager medical staff developed activities for medical training of family physicians and gynecologists, to improve medical resources, to achieve a better coordination among medical services, to adequate reference of obstetrical complications to higher-level hospitals, and for monitoring of maternal mortality committees operation. The other 23 IMSS administrative delegations were used as controls.

Results: Maternal mortality rates fell down from 40.7 to 28.2 per 100,000 live births among the delegations included in the strategy (mean reduction 30.7%). Among the control delegations maternal mortality rate fell down 1.5% only (32.3 to 31.8 per 100,000 live births). A similar phenomenon was observed for the absolute number of maternal deaths, with a reduction of 36.7% and 8.4%, respectively.

Conclusions: The improving intervention was associated with a noticeable reduction in the maternal mortality rate. It is necessary a long-term observation to confirm a cause-effect relationship.