Bacteremia and septic shock after solid-organ transplantation

Area of Science:

• Transplantation Medicine
• Infectious Diseases
• Critical Care Medicine

Background:

• Bacteremia and septic shock are significant causes of death post-solid-organ transplantation.
• Identifying risk factors for septic shock is crucial for improving patient outcomes.

Purpose of the Study:

• To assess the characteristics of patients with bloodstream infections and shock after solid-organ transplantation.
• To identify risk factors for mortality in these critically ill patients.

Main Methods:

• Prospective examination of bloodstream infections (bacteremia/fungemia) from 1991-2000.
• Septic shock defined by systemic inflammatory response syndrome and organ dysfunction despite hemodynamic support.
• Risk factors for shock and mortality analyzed using univariate and multivariate methods.

Main Results:

• 66 of 382 patients developed septic shock; 54% mortality.
• Risk factors for shock included age >50, liver transplant, nosocomial infection, pulmonary focus, P. aeruginosa, and polymicrobial infections.
• Age, nosocomial infection, and pulmonary source were significant on multivariate analysis.
• Gram-negative bacteria were the most common cause (53%); lung was the most frequent source (26%).
• Mortality was high (54%) even with appropriate empiric antimicrobial therapy (79% correct choice).

Conclusions:

• Age over 50, nosocomial acquisition, and pulmonary focus are key risk factors for developing septic shock in bacteremic transplant patients.
• High mortality persists despite adequate empiric antibiotic therapy.
• Urinary tract infections were associated with lower mortality compared to other infection sources.