ESTIMATION OF THE MORTALITY BY NOSOCOMIAL INFECTIONS EVALUATED FROM BACTERIOLOGICAL DATA AND DRGS (1989-1993)

We cross matched the informations from the medical records of the PMSI (French Program of Medicalisation of the Information System) with tho se from the bacteriology data base. The hospitalisation summaries prov ide the length of hospital stay, the mortality and the pathology defin ed by DRG (Diagnosis Related Group). Bacteriological data allow the di agnosis of nosocomial infections (NI) when using an appropriate method ology (''doubles'' and early samples are not taken in account). Then i t is possible to estimate the mortality when there are NI and No. 4499 stays NI were compared with 140 463 stays without NI. Mortality is 14 .4 % in NI group (17.5 % in medecine and 8.6% in surgery) against 2.1 % in the group without NI (2.5 % in medecine and 0.8 % in surgery). Am ong the 58 DRG's studied (more than 19 cases with NI), mortality and r elative risk varie a lot. Results are estimations because they are man y bias.