ABSTRACT
Objective / background: A decision about the need for antimicrobial therapy in a patient with febrile neutropenia after hematopoietic stem cell transplantation [HSCT] is often complicated because of the low frequency of culture isolation and reduced clinical manifestation of infection. Usefulness and choice of sepsis biomarkers to distinguish bloodstream infection [BSI] from other causes of febrile episode is still argued in HSCT recipients in modern epidemiological situations characterized by the emergence of highly resistant gram-negative microorganisms. In this study a comparative analysis of diagnostic values of presepsin, procalcitonin [PCT], and C-reactive protein [CRP] was performed as sepsis biomarkers in adult patients after HSCT in a condition of high prevalence of gram-negative pathogens
Methods: A prospective observational clinical study was performed at the Center of Hematology and Bone Marrow Transplantation in Minsk, Republic of Belarus. The biomarkers [presepsin, PCT, and CRP] were assessed in a 4-hour period after the onset of febrile neutropenia episode in adult patients after HSCT. Microbiologically-confirmed BSI caused by a gram-negative pathogen was set as a primary outcome
Results: Clinical and laboratory data were analyzed in 52 neutropenic patients after HSCT aged 18-79 years. Out of the biomarkers assessed, the best diagnostic value was shown in presepsin [area under the curve [AUC]: 0.889, 95% confidence interval [CI]: 0.644-0.987, p < .0001] with 75% sensitivity and 100% specificity, then in PCT [AUC: 0.741, 95% CI: 0.573-0.869, p = .0037] with 62% sensitivity and 88% specificity. The optimal cut-off value for CRP was set as 165 mg/L, while it had an average diagnostic value [AUC: 0.707, 95% CI: 0.564-0.825, p = .0049] with low sensitivity [40%] and should not be routinely recommended as a biomarker in adult patients with suspected BSI after HSCT
Conclusion: Presepsin may be recommended in adult patients with suspected gram-negative BSI after HSCT as a possible additional supplementary test with a cut-off value of 218 pg/ mL. PCT is inferior to presepsin in terms of sensitivity and specificity, but still shows a good quality of diagnostic value with an optimal cut-off value of 1.5 ng/mL. CRP showed an average diagnostic value with low sensitivity [40%] and should not be routinely recommended as a biomarker in adult patients with suspected BSI after HSCT in a condition of high prevalence of gram-negative pathogens
ABSTRACT
BACKGROUND: Bloodstream infections (BSI) remain a frequent complication during the pre-engraftment period after hematopoietic stem cell transplantation (HSCT), resulting in high mortality rates. This study evaluated risk factors for mortality in hematopoietic stem cell transplant recipients with BSI in the pre-engraftment period. METHODS: This prospective case control study was performed at the Center of Hematology and Bone Marrow Transplantation in Minsk, Republic of Belarus. Data relating to patient age and gender, date and type of transplantation, conditioning chemotherapy regimen, microorganisms isolated from blood, and antibacterial therapy were prospectively collected from all hematopoietic stem cell recipients with microbiologically proven cases of BSI in the pre-engraftment period. The primary outcome was all-cause 30-day mortality after onset of febrile neutropenia. RESULTS: A total of 135 adult patients with microbiologically proven BSI after HSCT were studied, with 65.2% of cases caused by gram-negative microorganisms and 21.5% by non-fermenting bacteria. Inadequate empiric antibacterial therapy and isolation of carbapenem-resistant non-fermenting gram-negative bacteria (Acinetobacter baumannii and Pseudomonas aeruginosa) were independently associated with increased all-cause 30-day mortality in these patients. CONCLUSION: The risk factors for mortality in adult patients with BSI in the pre-engraftment period after HSCT were inadequacy of empirical antibacterial therapy and isolation of carbapenem-resistant A. baumannii or P. aeruginosa.