Catheter-related bloodstream infections caused by Gram-negative bacteria

Area of Science:

• Infectious Diseases
• Critical Care Medicine
• Hospital Epidemiology

Background:

• Catheter-related bloodstream infections (CRBSI) are a significant healthcare-associated complication.
• Gram-negative bacteria (GN) are an important cause of CRBSI, but their specific risk factors and outcomes require further elucidation.
• Understanding the epidemiology of Gram-negative CRBSI (GN-CRBSI) is crucial for effective patient management.

Purpose of the Study:

• To investigate the incidence, risk factors, and mortality associated with Gram-negative catheter-related bloodstream infections (GN-CRBSI).
• To compare characteristics of patients with GN-CRBSI to those with CRBSI caused by other pathogens.
• To inform empirical treatment strategies for high-risk patients.

Main Methods:

• A case-control study design was employed, comparing patients with microbiologically confirmed GN-CRBSI to controls with CRBSI from other pathogens.
• Data were collected from 2008 to 2010, including patient demographics, comorbidities, previous treatments, and microbiological data.
• Statistical analysis was performed to identify factors associated with GN-CRBSI and mortality.

Main Results:

• The incidence of GN-CRBSI was 0.53 episodes per 1000 admissions, accounting for 17% of all CRBSI.
• Patients with GN-CRBSI were more likely to have underlying neurological or gastrointestinal diseases, prior antimicrobial therapy, and shorter time to positive blood cultures.
• Factors associated with increased mortality included surgery during the admission (OR: 3.5), P. aeruginosa infection (OR: 3.6), and complicated bacteremia (OR: 4.1).

Conclusions:

• Gram-negative CRBSI (GN-CRBSI) constitute a notable proportion of CRBSI cases and are associated with specific patient characteristics.
• The identification of risk factors and mortality predictors underscores the importance of considering GN pathogens in empirical therapy.
• Healthcare providers should consider GN-CRBSI in empirical treatment decisions for patients presenting with the identified risk factors.