Risk Factors for a Hospital-Acquired Carbapenem-Resistant Bloodstream Infection: A Five-Year Retrospective Study.

Purpose: This study aimed to describe trends in (KP) resistance in bloodstream infections (BSI) and to identify risk factors for a hospital-acquired carbapenem-resistant (CRKP) BSI and 28-day mortality from a hospital-acquired KP BSI.

Patients And Methods: We recorded the results of antimicrobial susceptibility testing of 396 KP-positive blood cultures from January 2016 to December 2020. A total of 277 patients with a KP BSI were included in this study, of which 171 had a hospital-acquired infection and 84 had a hospital-acquired CRKP BSI. Multivariate logistic regression analysis was used to identify risk factors for a hospital-acquired CRKP BSI and 28-day mortality from a hospital-acquired KP BSI.

Results: The proportion of hospital-acquired infections among KP BSI patients increased from 53.1% in 2016 to 72.8% in 2020. The detection rate of CRKP among KP BSI patients increased from 18.8% in 2016 to 37.7% in 2020. Multivariate logistic regression showed that β-lactam/β-lactamase inhibitor combinations (BLBLIs) exposure (  = 0.022, OR 2.863), carbapenems exposure (  = 0.007, OR 3.831) and solid organ transplantation (   <0.001, OR 19.454) were independent risk factors for a hospital-acquired CRKP BSI. Risk factors for a 28-day mortality from hospital-acquired KP BSI were CRKP BSI (  =0.009, OR 5.562), septic shock (  =0.002, OR 4.862), mechanical ventilation>96 hours ( =0.020, OR 8.765), and platelet counts <100×10/L (  =0.003, OR 4.464).

Conclusion: The incidence of hospital-acquired KP BSI continues to rise and the proportion of CRKP BSI is also increasing. We believe that the use of the BLBLIs needs to be carefully evaluated in hospital-acquired infection. Hospital-acquired KP BSI Patients with CRKP BSI, septic shock, mechanical ventilation and deficiency of platelets are more likely to have a poor prognosis.