J. Rello et al., NOSOCOMIAL BACTEREMIA IN A MEDICAL-SURGICAL INTENSIVE-CARE UNIT - EPIDEMIOLOGIC CHARACTERISTICS AND FACTORS INFLUENCING MORTALITY IN 111 EPISODES, Intensive care medicine, 20(2), 1994, pp. 94-98
Objective: To analyze the epidemiology and factors influencing mortali
ty of ICU-acquired bacteremia. Design: Prospective clinical study. Set
ting: A medical-surgical ICU in an university hospital. Patients: We r
ecorded variables from 111 consecutive ICU-acquired episodes for a 3-y
ear period. Results: The attack rate was 1.9 episodes per 100 patient-
days. The commonest isolates were coagulase-negative staphylococci, St
aphylococcus aureus, Pseudomonas aeruginosa, and Escherichia coli. Int
ravascular catheters were the most frequent source of infection. Overa
ll mortality was 31.5%, and 65.7% of all deaths were directly attribut
able to infection. Bacteremia from intra-abdominal, lower respiratory
tract or unknown origin were associated with a poor prognosis. A logis
tic regression analysis defined intraabdominal origin (p = 0.01, OR =
15.7) and presence of shock (p = 0.04, OR = 3.3) as independently infl
uencing the risk of death. No significant differences were found for t
he remaining variables studied. Conclusions: Epidemiology and etiology
of ICU-acquired bacteremia does not differ seriously in respect to no
socomial bacteremia among unselected populations, although it is assoc
iated with a greater incidence and overall mortality. Presence of shoc
k is the most important modificable variable affecting the outcome.