Risk factors and clinical outcomes associated with blood culture contamination

Author(s):  
Justin M. Klucher ◽  
Kevin Davis ◽  
Mrinmayee Lakkad ◽  
Jacob T. Painter ◽  
Ryan K. Dare

Abstract Objective: To determine patient-specific risk factors and clinical outcomes associated with contaminated blood cultures. Design: A single-center, retrospective case-control risk factor and clinical outcome analysis performed on inpatients with blood cultures collected in the emergency department, 2014–2018. Patients with contaminated blood cultures (cases) were compared to patients with negative blood cultures (controls). Setting: A 509-bed tertiary-care university hospital. Methods: Risk factors independently associated with blood-culture contamination were determined using multivariable logistic regression. The impacts of contamination on clinical outcomes were assessed using linear regression, logistic regression, and generalized linear model with γ log link. Results: Of 13,782 blood cultures, 1,504 (10.9%) true positives were excluded, leaving 1,012 (7.3%) cases and 11,266 (81.7%) controls. The following factors were independently associated with blood-culture contamination: increasing age (adjusted odds ratio [aOR], 1.01; 95% confidence interval [CI], 1.01–1.01), black race (aOR, 1.32; 95% CI, 1.15–1.51), increased body mass index (BMI; aOR, 1.01; 95% CI, 1.00–1.02), chronic obstructive pulmonary disease (aOR, 1.16; 95% CI, 1.02–1.33), paralysis (aOR 1.64; 95% CI, 1.26–2.14) and sepsis plus shock (aOR, 1.26; 95% CI, 1.07–1.49). After controlling for age, race, BMI, and sepsis, blood-culture contamination increased length of stay (LOS; β = 1.24 ± 0.24; P < .0001), length of antibiotic treatment (LOT; β = 1.01 ± 0.20; P < .001), hospital charges (β = 0.22 ± 0.03; P < .0001), acute kidney injury (AKI; aOR, 1.60; 95% CI, 1.40–1.83), echocardiogram orders (aOR, 1.51; 95% CI, 1.30–1.75) and in-hospital mortality (aOR, 1.69; 95% CI, 1.31–2.16). Conclusions: These unique risk factors identify high-risk individuals for blood-culture contamination. After controlling for confounders, contamination significantly increased LOS, LOT, hospital charges, AKI, echocardiograms, and in-hospital mortality.

2020 ◽  
Vol 68 (7) ◽  
pp. 1241-1249
Author(s):  
Yin Zhang ◽  
Jilei Lin ◽  
Qingxia Shi ◽  
Chulin Li ◽  
Jingyue Liu ◽  
...  

Early recognition of severe clinical outcomes in children with pneumonia-related bacteremia is vitally important because of the high mortality. This study aims to explore risk factors for severe clinical outcomes in children with pneumonia-related bacteremia and evaluate the value of time to first positive blood cultures (TTFP) in predicting prognosis. Children with pneumonia-related bacteremia in Children’s Hospital of Chongqing Medical University were included (January 2013–May 2019), respectively. TTFP and clinical parameters were collected and analyzed. The area under the curve (AUC)-receiver operating characteristic was used to evaluate the discrimination ability of TTFP. Multivariate logistic regression tests were performed to evaluate the association between TTFP and severe clinical outcomes. A total of 242 children with pneumonia-related bacteremia were included. The least absolute shrinkage and selection operator (LASSO) regression analysis identified TTFP, serum albumin (ALB) and lactic dehydrogenase (LDH) as predictors of in-hospital mortality. Multivariate logistic regression analysis showed that shorter TTFP (OR 0.94; 95% CI 0.89 to 0.97; p<0.01), lower ALB level (OR 0.93; 95% CI 0.89 to 0.98; p<0.01) and higher LDH level (OR 1.001; 95% CI 1.000 to 1.001; p<0.01) were risk factors for in-hospital mortality in children with pneumonia-related bacteremia. AUC of TTFP for predicting in-hospital mortality was 0.748 (95% CI 0.668 to 0.829). Shorter TTFP (≤16 hours) was associated with in-hospital mortality and septic shock. TTFP plays an important role in predicting severe clinical outcomes in children with pneumonia-related bacteremia.


2021 ◽  
Vol 10 (Suppl 1) ◽  
pp. e001335
Author(s):  
Charu Malhotra ◽  
Akshay Kumar ◽  
Ankit Kumar Sahu ◽  
Akshaya Ramaswami ◽  
Sanjeev Bhoi ◽  
...  

IntroductionFailure of early identification of sepsis in the emergency department (ED) leads to significant delays in antibiotic administration which adversely affects patient outcomes.AimThe primary objective of our Quality Improvement (QI) project was to reduce the door-to-antibiotic time (DTAT) by 30% from the preintervention in patients with suspected sepsis. Secondary objectives were to increase the blood culture collection rate by 30% from preintervention, investigate the predictors of improving DTAT and study the effect of these interventions on 24-hour in-hospital mortality.MethodsThis QI project was conducted in the ED of a tertiary care teaching hospital of North India; the ED receives approximately 400 patients per day. Adult patients with suspected sepsis presenting to our ED were included in the study, between January 2019 and December 2020. The study was divided into three phases; preintervention phase (100 patients), intervention phase (100 patients) and postintervention phase (93 patients). DTAT and blood cultures prior to antibiotic administration was recorded for all patients. Blood culture yield and 24-hour in-hospital mortality were also recorded using standard data templates. Change ideas planned by the Sepsis QI Team were implemented after conducting plan-do-study-act cycles.ResultsThe median DTAT reduced from 155 min in preintervention phase to 78 min in postintervention phase. Drawing of blood cultures prior to antibiotic administration improved by 67%. Application of novel screening tool at triage was found to be an independent predictor of reduced DTAT.ConclusionOur QI project identified the existing lacunae in implementation of the sepsis bundle which were dealt with in a stepwise manner. The sepsis screening tool and on-site training improved care of patients with sepsis. A similar approach can be used to deal with complex quality issues in other high-volume low-resource settings.


Author(s):  
P. Elliott Miller ◽  
Fouad Chouairi ◽  
Alexander Thomas ◽  
Yukiko Kunitomo ◽  
Faisal Aslam ◽  
...  

Background Several studies have shown improved outcomes in closed compared with open medical and surgical intensive care units. However, very little is known about the ideal organizational structure in the modern cardiac intensive care unit (CICU). Methods and Results We retrospectively reviewed consecutive unique admissions (n=3996) to our tertiary care CICU from September 2013 to October 2017. The aim of our study was to assess for differences in clinical outcomes between an open compared with a closed CICU. We used multivariable logistic regression adjusting for demographics, comorbidities, and severity of illness. The primary outcome was in‐hospital mortality. We identified 2226 patients in the open unit and 1770 in the closed CICU. The unadjusted in‐hospital mortality in the open compared with closed unit was 9.6% and 8.9%, respectively ( P =0.42). After multivariable adjustment, admission to the closed unit was associated with a lower in‐hospital mortality (odds ratio [OR], 0.69; 95% CI: 0.53–0.90, P =0.007) and CICU mortality (OR, 0.70; 95% CI, 0.52–0.94, P =0.02). In subgroup analysis, admissions for cardiac arrest (OR, 0.42; 95% CI, 0.20–0.88, P =0.02) and respiratory insufficiency (OR, 0.43; 95% CI, 0.22–0.82, P =0.01) were also associated with a lower in‐hospital mortality in the closed unit. We did not find a difference in CICU length of stay or total hospital charges ( P >0.05). Conclusions We found an association between lower in‐hospital and CICU mortality after the transition to a closed CICU. These results may help guide the ongoing redesign in other tertiary care CICUs.


2021 ◽  
Vol 8 (Supplement_1) ◽  
pp. S8-S8
Author(s):  
ifueko J Adeghe ◽  
Dima Kabbani ◽  
Tanis C Dingle ◽  
Justin Chen

Abstract Background Candidemia is associated with significant morbidity and mortality. The impact of infectious diseases consultation (IDC) on clinical outcomes in patients with candidemia is not well established. We evaluated the impact of IDC and a management bundle on clinical outcomes in patients with candidemia. Methods A retrospective chart review of adult (age ≥ 18 years) patients with at least 1 blood culture growing Candida species identified at Alberta Precision Laboratories between December 1, 2019 to November 30, 2020 and hospitalized at the University of Alberta Hospital, Edmonton, Canada were included. Patients who died within 48 hours and those who left against medical advice within 24 hours of initial positive blood culture result were excluded. Demographics, management, and outcome data were collected. A complete management bundle was defined as having all the following elements performed: IDC, repeat blood cultures, empiric echinocandin therapy, ophthalmology consult, and echocardiogram. Results Thirty-one patients were included for study; mean age was 56 ± 17 years and 65% were male. 14 (45%) cases were admitted under critical care, 7 (23%) surgery, and 10 (32%) medicine. 3/17 (18%) required intensive care unit admission following candidemia diagnosis. Candida albicans was identified in more than half the cases. The primary source was intra-abdominal in 12 (39%), central-line associated in 8 (26%), and urinary in 6 (19%). IDC occurred in 27 cases (87%), echocardiogram in 22 (71%), ophthalmology consult in 10 (32%), and follow-up blood cultures in 30 (97%). 20 (65%) patients received empiric echinocandin. Of the remainder who received empiric fluconazole, 4 (36%) grew non albicans Candida species. Higher in-hospital mortality was observed in cases without IDC than those with IDC (4/4, 100% vs 8/27, 29.6%, p=0.016) and in those that did not have a complete bundle (12/25, 48% vs 0/6, p=0.059). However, IDC was not associated with the receipt of individual bundle components nor the complete bundle (p=NS). Conclusion In patients with candidemia, lower in-hospital mortality was observed in patients who received IDC. Larger studies are required to confirm our findings and assess whether the implementation of a candidemia management bundle is beneficial. Disclosures Dima Kabbani, MD, AVIR Pharma (Grant/Research Support, Other Financial or Material Support, Speaker)Edesa Biotech (Scientific Research Study Investigator)Merck (Scientific Research Study Investigator)


2019 ◽  
Vol 6 (Supplement_2) ◽  
pp. S676-S676
Author(s):  
Kevin A Davis ◽  
Jacob Painter ◽  
Mrinmayee Lakkad ◽  
Ryan K Dare

Abstract Background Blood cultures are the primary diagnostic tool for bloodstream infections, but accuracy of results is dependent on collection technique. Decreasing blood culture contaminations is a priority for antimicrobial stewardship programs as false positives can expose patients to adverse effects of unnecessary antibiotics. In this study, we present an analysis comparing clinical outcomes and cost associated with false-positive and true negative blood cultures at our institution. Methods We conducted a single-center, retrospective, case–control study in patients admitted following blood culture collection in the emergency department from 2014 to 2018. Demographic and clinical characteristics were evaluated in patients with false-positive blood cultures (cases) and negative blood cultures (controls). Contaminants were identified per American Society of Microbiology recommendations. Clinical outcomes were compared between cases and controls, and adjusted analyses were performed with logistic regression, linear regression, and generalized linear models controlling for age, race, body mass index, and sepsis. Statistical analysis was performed using SAS 9.4. Results A total of 1,102 cases and 11,266 controls were included in analysis. All clinical outcome measures were significantly higher in patients with contaminated blood cultures (see table). Select clinical outcomes remained significant when controlling for potential confounders. Conclusion To the best of our knowledge, this is the largest study evaluating the clinical and financial impact of blood culture contamination with inclusion of >1,000 cases during a 5-year period. Our study shows that blood culture contamination is associated with increased length of stay, unnecessary exposure to antibiotics and procedures, development of antibiotic-associated adverse events, and higher hospital charges as reported in smaller studies. However, this study is the first to the best of our knowledge reporting increased mortality associated with blood culture contamination. Implementation of innovative strategies to reduce contamination should be pursued. Antimicrobial stewardship programs should prioritize identification of contaminants and rapid de-escalation of inappropriate antibiotics in these patients to improve patient care. Disclosures All authors: No reported disclosures.


2015 ◽  
Vol 25 (8) ◽  
pp. 1572-1578 ◽  
Author(s):  
Andrzej Kansy ◽  
Tjark Ebels ◽  
Christian Schreiber ◽  
Jeffrey P. Jacobs ◽  
Zdzislaw Tobota ◽  
...  

AbstractObjectivePrevious analyses have suggested an association between centre volume and in-hospital mortality, post-operative complications, and mortality in those patients who suffer from a complication. We sought to determine the nature of this association using a multicentre cohort.MethodsAll the patients, aged 18 years or younger, undergoing heart surgery at centres participating in the European Congenital Heart Surgeons Database (2003–2013) were included. Programmes were grouped as follows: small <150; medium 150–250; large 251–349; very large >350. Multivariable logistic regression was used to identify the differences between groups with the adjusted in-hospital mortality, onset of any and/or major complication, and in-hospital mortality in those patients with any and/or major complication. The outcomes were adjusted for patient specific risk factors and surgical risk factors.ResultsThe data set consisted of 119,345 procedures performed in 99 centres. Overall, in-hospital mortality was 4.63%; complications occurred in 23.4% of the patients. In-hospital mortality in patients with complications was 13.82%. Multivariable logistic regression showed that the risk of in-hospital death was higher in low- and medium-volume centres (p<0.001). The rate of the occurrence of any post-operative complication in small, medium, and large programmes was lower compared with very large centres (p<0.001). Low- and medium-volume centres were associated with significantly higher mortality in patients with any complication (p<0.001).ConclusionsOur analysis showed that the risk of in-hospital mortality was lower in higher-volume centres. Although the risk of complications is higher in high-volume centres, the mortality associated with complications that occurred in these centres was lower.


2019 ◽  
Vol 6 (Supplement_2) ◽  
pp. S701-S702
Author(s):  
Axel Vazquez Deida ◽  
Veronica Salazar ◽  
Lilly Lee ◽  
Lilian Abbo

Abstract Background Blood cultures are the gold standard in the identification of laboratory confirmed bloodstream infections (LCBI) but contamination can lead to unnecessary interventions. This study sought to assess the number of unwarranted admissions in patients with contaminated blood cultures post-discharge and at low risk for LCBI before and after the implementation of a multidisciplinary emergency department (ED) blood culture follow-up program. Methods This was a two-phase retrospective cohort study at a tertiary care, 1,550-bed, academic hospital and level I trauma center in southeast Florida. Phase 1 assessed interventions made on patients 18 years of age or older discharged from the ED or a hospital observation unit with a positive blood culture result post-discharge from March 2018 to July 2018. Phase 2 assessed interventions made from December 2018 to March 2019 post-implementation of the multidisciplinary follow-up program. The criteria for low risk of LCBI were lack of risk factors for infection and < 2 positive blood cultures with a commensal bacteria with no symptoms of fever or hypotension on the date of specimen collection and 3 days before or after such date. Results Among patients at low risk for LCBI (46% of 24 patients in phase 1 vs. 59% of 22 patients in phase 2), unwarranted admissions due to contaminated blood cultures occurred in 27.3% of patients in phase 1 vs. 0% of patients in phase 2 (P = 0.08). Phase 1 represented a period in which systematic reporting and evaluation of positive results and patient follow-up were not in place. Phase 2 consisted of daily pharmacist-led blood culture reviews with callback nurse follow-up and therapeutic care plan development with ED physicians. The number of contaminant isolates was relatively high (Figures 1 and 2). Pharmacist-led interventions were diverse (Figure 3). The program led to an estimated total cost avoidance of $16,410.80 in a median of 4.5 months due to unnecessary admissions. Conclusion Implementation of a multidisciplinary ED post-discharge blood culture follow-up program can be an effective strategy in improving patient care and avoiding unnecessary antibiotic therapy. Further interventions aimed at reducing blood culture contamination could have a direct impact on improving ED antimicrobial stewardship. Disclosures All authors: No reported disclosures.


Author(s):  
Devi Meenakshi K. ◽  
Arasar Seeralar A. T. ◽  
Srinivasan Padmanaban

Background: Very low birth weight (VLBW) babies are at increased risk of a number of complications both immediate and late. Worldwide it has been observed that these babies contribute to a significant extent to neonatal mortality and morbidity. Aim of the study was to study the risk factors contributing to mortality in VLBW babies and to evaluate the morbidity pattern in these infants.Methods: A retrospective analysis of data retrieved from the case records of VLBW babies admitted in the NICU of Kilpauk Medical College between January 2015 to December 2015. Out of the 2360 intramural babies admitted during the study period, 99 babies were less than 1500 gms. The risk factors for these babies were analyzed for their association with the outcome. Data were statistically analyzed.Results: In present study, we found that sex of the baby, gestational age, obstetric score, birth asphyxia, pulmonary haemorrhage, ROP and presence of shock were found to be associated with increased mortality. By logistic regression analysis it was observed that birth weight of the baby (p value 0.002), duration of stay (p value 0.0006), presence of shock (p<0.0001), were the risk factors significantly associated with poor outcome.Conclusions: Among the maternal and neonatal factors analyzed in the study using logistic regression analysis, birth weight, duration of hospital stay and presence of shock were significantly related to poor outcome. Of these presence of shock was the single most important factor that predicted increased mortality.


2021 ◽  
Vol 9 ◽  
Author(s):  
Huabin Wang ◽  
Zhongyuan He ◽  
Jiahong Li ◽  
Chao Lin ◽  
Huan Li ◽  
...  

Objective: Identifying high-risk children with a poor prognosis in pediatric intensive care units (PICUs) is critical. The aim of this study was to assess the predictive value of early plasma osmolality levels in determining the clinical outcomes of children in PICUs.Methods: We retrospectively assessed critically ill children in a pediatric intensive care database. The locally weighted-regression scatter-plot smoothing (LOWESS) method was used to explore the approximate relationship between plasma osmolality and in-hospital mortality. Linear spline functions and stepwise expansion models were applied in conjunction with a multivariate logistic regression to further analyze this relationship. A subgroup analysis by age and complications was performed.Results: In total, 5,620 pediatric patients were included in this study. An approximately “U”-shaped relationship between plasma osmolality and mortality was detected using LOWESS. In the logistic regression model using a linear spline function, plasma osmolality ≥ 290 mmol/L was significantly associated with in-hospital mortality [odds ratio (OR) 1.020, 95% confidence interval (CI) 1.010–1.031], while plasma osmolality &lt;290 mmol/L was not significantly associated with in-hospital mortality (OR 0.990, 95% CI 0.966–1.014). In the logistic regression model with plasma osmolality as a tri-categorical variable, only high osmolality was significantly associated with in-hospital mortality (OR 1.90, 95% CI 1.38–2.64), whereas low osmolality was not associated with in-hospital mortality (OR 1.28, 95% CI 0.84–1.94). The interactions between plasma osmolality and age or complications were not significant.Conclusion: High osmolality, rather than low osmolality, can predict a poor prognosis in children in PICUs.


2019 ◽  
Vol 6 (Supplement_2) ◽  
pp. S271-S271
Author(s):  
Gauri Chauhan ◽  
Nikunj M Vyas ◽  
Todd P Levin ◽  
Sungwook Kim

Abstract Background Vancomycin-resistant Enterococci (VRE) occurs with enhanced frequency in hospitalized patients and are usually associated with poor clinical outcomes. The purpose of this study was to evaluate the risk factors and clinical outcomes of patients with VRE infections. Methods This study was an IRB-approved multi-center retrospective chart review conducted at a three-hospital health system between August 2016-November 2018. Inclusion criteria were patients ≥18 years and admitted for ≥24 hours with cultures positive for VRE. Patients pregnant or colonized with VRE were excluded. The primary endpoint was to analyze the association of potential risk factors with all-cause in-hospital mortality (ACM) and 30-day readmission. The subgroup analysis focused on the association of risk factors with VRE bacteremia. The secondary endpoint was to evaluate the impact of different treatment groups of high dose daptomycin (HDD) (≥10 mg/kg/day) vs. low dose daptomycin (LDD) (< 10 mg/kg/day) vs. linezolid (LZD) on ACM and 30-day readmission. Subgroup analysis focused on the difference of length of stay (LOS), length of therapy (LOT), duration of bacteremia (DOB) and clinical success (CS) between the treatment groups. Results There were 81 patients included for analysis; overall mortality was observed at 16%. Utilizing multivariate logistic regression analyses, patients presenting from long-term care facilities (LTCF) were found to have increased risk for mortality (OR 4.125, 95% CI 1.149–14.814). No specific risk factors were associated with 30-day readmission. Patients with previous exposure to fluoroquinolones (FQ) and cephalosporins (CPS), nosocomial exposure and history of heart failure (HF) showed association with VRE bacteremia. ACM was similar between HDD vs. LDD vs. LZD (16.7% vs. 15.4% vs. 0%, P = 0.52). No differences were seen between LOS, LOT, CS, and DOB between the groups. Conclusion Admission from LTCFs was a risk factor associated with in-hospital mortality in VRE patients. Individuals with history of FQ, CPS and nosocomial exposure as well as history of HF showed increased risk of acquiring VRE bacteremia. There was no difference in ACM, LOS, LOT, and DOB between HDD, LDD and LZD. Disclosures All authors: No reported disclosures.


Sign in / Sign up

Export Citation Format

Share Document