Impact Of Bloodstream Infections Research Articles

Evaluating the costs of Escherichia coli bloodstream infections: a population-based cohort study in a large metropolitan Canadian region.

We evaluated the costs of susceptible and resistant Escherichia coli bloodstream infections (BSIs) in adults. Secondary outcomes were the impact of BSI on length of stay (LOS), readmissions and death. We examined a population-based retrospective cohort of blood cultures from 2011 to 2018 in Calgary, Canada, linked to microcosting and gross costing data. Propensity score matching was completed, and costs were compared between no BSI and E. coli BSI over 90 days using linear regression. A total of 4581 BSIs in 89 673 adults experienced E. coli bacteraemia during the study period. The mean cost of an E. coli BSI at 90 days was $39 072 (SD: $95 747) in adults. Ceftriaxone-resistant (CRO-R) E. coli, resistant to fluoroquinolones (FQ) and trimethoprim/sulfamethoxazole, compared with susceptible E. coli BSI resulted in the greatest mean cost at $53 899 and the highest odds of readmission, increased LOS, and death. E. coli BSI is associated with substantial costs. Total cost differences were highest in those with CRO-R E. coli with resistance to FQ and trimethoprim/sulfamethoxazole. Over the study period, bacteraemia secondary to these strains alone, added over $9 million to costs for healthcare in the Calgary Zone.

The long-term impact of bloodstream infections on patient and graft survival following kidney transplantation.

There are limited data on the impact of bloodstream infections (BSI) following kidney transplantation (KT) on long term patient outcome. This was a retrospective parallel-cohort study. We included 123 consecutive KT recipients who were admitted with a first episode of BSI between January 2007 and December, 2016. They were matched with 225 KT recipients who did not have BSI. Multivariate regression analysis with BSI as time-dependent covariate was used for the effect of BSI on graft loss, all-cause mortality and long-term graft function (defined by the slope of mean serum creatinine level). During a median follow-up of 89.4 months, post-transplant BSI was independently associated with all-cause mortality (HR 5.56, 95% CI 3.07-10.09, P<.0001) and graft failure (HR-2.82, 95% CI 1.40-5.64, P=.003) after adjustment for potential confounders. This association remained irrespective of the source of infection or pathogen, but became nonsignificant when appropriate antibiotic therapy was administrated. Baseline kidney function was independently associated with graft failure. Recipients with BSI had lower baseline kidney function; however, the BSI episode had no influence on the slope of change in serum creatinine over time. BSI after KT was associated with long-term adverse outcome. This effect was mitigated by the early administration of appropriate antibiotics.

Polymicrobial and Multiple Blood Stream Infection Episodes as Risk Factors for On-Pump Mortality in Mechanical Circulatory Support Patients

<h3>Purpose</h3> Despite our improving experience with the expanding use of mechanical circulatory support systems for end-stage heart failure, device related infection remains prevalent. This study aims to better characterize the clinical impact of blood stream infections (BSIs) over a 26-year period. <h3>Methods</h3> This was a single center retrospective study of patients with durable mechanical circulatory supports implanted from June 1994 to December 2020 as bridge-to-transplantation. Patients were studied for the incidence of BSIs, number of on-pump support days, transition to transplant and on-pump mortality. Descriptive statistics and relationships between the incidences or types of infections and on-pump mortality were analyzed. <h3>Results</h3> Two-hundred and fifty patients (204 males, 82%) with average age at implant of 52.1±13.7 years and average INTERMACS score of 1.9±0.7 were studied. Implanted devices included 221 (88.4%) left VADs, 17 (6.8%) biVADs and 8 (3.2%) total artificial hearts. Average on-pump duration was 377±381 days. There were 108 (43%) patients with one or more BSIs, and 0.42 events per patient year. Of these cases, 71 (28.4% of total patients, 65.7% of all BSI episodes) were single episodes, whilst 37 had multiple episodes (occurring at least seven days after index infection) and 28 had polymicrobial growths (2 organisms or more during time on-pump). The major responsible organisms for initial BSI were staphylococci (67.6%), streptococci (8.3%) and enterococci (6.5%) species. There were 93 (37.2%) patients with positive microbiology growths from superficial driveline site swabs, of which 46 out of 93 (49.5%) had BSIs. On logistic regression against hypertension, diabetes mellitus and requirement for dialysis, positive driveline microbiology was a significant predictor of mortality (p=0.01). Amongst patients with BSIs, there were significantly increased proportions of on-pump mortality for those who had multiple BSIs (p=0.03) or BSIs with multiple organisms (p<0.01). <h3>Conclusion</h3> Infections, either sequential or with multiple organisms, are significant markers for on-pump mortality. Whilst limiting any infection is important at the outset of device implantation, this study highlights the importance and urgency of timely recognition and early administration of targeted and intensive antimicrobial therapies.

El sistema cerrado en la prevención de las infecciones del torrente sanguíneo

Los pacientes hospitalizados están en continuo riesgo de infecciones del torrente sanguíneo (ITS), especialmente en las unidades de cuidado intensivo (UCI). Las ITS constituyen 14% de las infecciones nosocomiales (IN) y representan casi un tercio de las muertes asociadas con IN. Es así que se han establecido pautas de prevención y protocolos de manejo para reducir el impacto de las ITS asociadas a catéteres (CR). Entre ellas están las diferencias entre contenedores de infusión intravenosa (IV). Los de infusión abierto necesitan la introducción de aire para su vaciamiento. Los de infusión cerrado son contenedores colapsables que no requieren aire para su vaciamiento. En conclusión, en la era de la seguridad del paciente se hace necesario que los sistemas de salud propendan por hacer los cambios en la tecnología que redundan en una mejor atención y que muchas veces son costo/efectivas

The correlation between nursing workload and bloodstream infection from central venous catheter in ICU

Introduction: Bloodstream infection associated with the presence of central venous catheters is the second most common hospital infection in the Intensive Care Unit (ICU). The nursing stuff is an essential part of the human resources of the ICU which contributes substantially to provide holistic and effective care to critically ill patients. The level of the nursing workload and its possible influence on the clinical course and outcome of critically ill ICU patients has been systematically studied in recent years. Mainly, was studied the connection with the care quality indicators such as mortality and infections Aim: The purpose of this study was to estimate the nursing workload in the ICU and to investigate the impact of bloodstream infection from Central Venous Catheter (CLABSI). Methods: The study sample consisted of 39 patients who were hospitalized in a multidisciplinary ICU in a 3 month period. For the detection of bloodstream infections we used the surveillance definition of CDC/NHSN for in vitro confirmed bloodstream infection (CLABSI). Measurement of nursing workload was via the NAS scale and the calculation was performed for each patient once existed or entering the ICU from baseline and constantly on a daily basis. A comparison of the quantitative variables was done with the statistical criterion Pearson’s x 2 , to compare the bisectors qualitative variables selected quantitative variables was used the t-test analysis and MannWhitney test. Results: Of the total sample, 74,4% (n = 29) were male, with a mean age 59 ± 21 years. The duration of ICU stay was 24 ± 23 days and mortality was 41%. The duration of hospitalization was 28 ± 24 days and the corresponding mortality of 46.2%. All correlations presented no statistically significant difference than the first day’s NAS in which appears the biggest difference between the values (p=0,046) but the NAS of the patients who did not develop bacteremia be more increased over those experienced. Conclusions: The nursing workload in our study did not prove as a risk factor for the occurrence of bloodstream infection in the ICU.

Epidemiology and impact of bloodstream infections among kidney transplant recipients: A retrospective single-center experience.

Bloodstream infection (BSI) represents an important source of morbidity and mortality, as well as an increasing therapeutic challenge, among solid organ transplant recipients. Understanding the epidemiological and microbiological characteristics of BSI following renal transplantation is paramount to the implementation of appropriate preventative and therapeutic measures. We conducted a retrospective review of all BSI episodes occurring between July 2009 and April 2016 in adult patients, who received a renal transplant at Royal Free London hospital. A total of 116 episodes of BSI occurred in 87 patients, 43 (49.4%) of them men. The mean age at BSI was 54.37±12.81years. Late-onset BSI (>12months post transplant) represented 55.2%, with the median time to BSI being 16.28month. Sixty-seven patients had single BSI and 20 had recurrent episodes. Enterobacteriaceae were responsible for 73.7% of BSI, with Escherichia coli the commonest causative organism (46.6%). The urinary tract was the most frequent source of infection in 56.9%. Among the E.coli infections, 100% of the tested isolates were sensitive to meropenem, ertapenem, tigecycline, and fosfomycin, and >90% were sensitive to piperacillin-tazobactam, amikacin, and colistin. Lower susceptibility rates were encountered for ceftriaxone (70.6%), amoxicillin-clavulanic acid (48.1%), cotrimoxazole (40.4%), trimethoprim (37.3%), and amoxicillin (21.6%). During BSI, the median serum creatinine increased from a reference of 131μmol/L to a peak of 219μmol/L. Acute kidney injury (AKI) complicated 75/116 BSI episodes (64.7%)-stage 1: 34, stage 2: 31, and stage 3 AKI: 10 episodes. After 3months, the median creatinine remained elevated at 146μmol/L. The 3-month mortality rate was 8% (7/87), and the death-censored graft loss was 6.9% (6/87). No significant difference was seen between BSI of urinary and non-urinary sources in the incidence of AKI (χ2 =0.24, P=.6) or the percentage of creatinine change between baseline and peak and 3-month creatinines (P=.2 and .7 respectively). Urinary tract infection remains the commonest source of systemic infection among kidney transplant recipients and resistance to commonly used frontline antibiotics is common; thus, prevention and early detection are paramount. The appropriate choice of initial empirical antibiotic is vital to improve the outcome. Each unit needs to understand the epidemiology of organisms causing BSI in their transplant patients and their antibiotic susceptibilities.

Early blood stream infection following allogeneic hematopoietic stem cell transplantation is a risk factor for acute grade III-IV GVHD in children and adolescents.

Graft-versus-host disease (GVHD) remains a major cause of mortality and morbidity in allogeneic hematopoietic stem cell transplantation (HSCT). In adults, early blood stream infection (BSI) and acute GVHD (AGVHD) have been reported to be related. The impact of BSI on risk for AGVHD, however, has not been assessed in pediatric patients. We conducted a retrospective analysis to test the hypothesis that early BSI (before day +30) predisposes allogeneic pediatric transplant patients to severe AGVHD. We analyzed 293 allogeneic HSCT performed at Children's Healthcare of Atlanta between 2005 and 2014 that met eligibility criteria. The cumulative incidence of acute grade III-IV GVHD at 100 days after HSCT was 17.1%. In multivariate analysis, risk for acute grade III-IV GVHD was associated with HLA-mismatched donor (hazard ratio [HR]=4.870, P<0.001), and BSI between day 0 and +30 prior to AGVHD (HR=3.010, P=0.001). These results indicate that early BSI appears to be a risk factor for acute grade III-IV GVHD. Further research is needed to determine if the link is causal.

A Multicenter Study of Bacterial Blood Stream Infections in Pediatric Allogeneic Hematopoietic Cell Transplantation Recipients: The Role of Acute Gastrointestinal Graft-versus-Host Disease

Blood stream infections (BSI) caused by enteric organisms are associated with a particularly high mortality rate in allogeneic hematopoietic cell transplantation (alloHCT) recipients. We conducted a retrospective multicenter study aiming to analyze the risk factors associated with antibiotic resistance and impact of BSI on transplantation-related mortality (TRM) in children after alloHCT. During the study period from 2004 to 2014, 395 children (mean age, 9.4 years) with at least 1 BSI were included. The incidences of resistant gram-negative rods were 20.7% to piperacillin-tazobactam, 10.9% to cefepime, 21% to ceftazidime, 11.4% to levofloxacin, and 8.16% to meropenem. Thirty-eight percent of Enterococcus spp. isolates were resistant to vancomycin. More than 1 episode of BSI was associated with significant increase in the risk of resistance to piperacillin-tazobactam, cefepime, and vancomycin. On multivariate analysis of risk factors for TRM, achievement of neutrophil engraftment by day 30 was associated with lower TRM (P = .002). However, infection with an antibiotic-resistant organism was not associated with TRM. Development of enteric bacterial BSI after the onset of acute gastrointestinal graft-versus-host disease (GVHD) was the strongest predictor of TRM (hazard ratio, 4.786; 95% confidence interval, 2.833 to 8.087; P < .001). In patients with acute gastrointestinal GVHD who subsequently developed enteric bacterial BSI, the incidence of 1-year TRM was 33.4% (SE = 7%), compared with 15.3% (SE = 2%) for those without acute gastrointestinal GVHD (P = .004). Primary prevention of a first episode of BSI is arguably the most important intervention to decrease antibiotic resistance. It is also imperative that we develop strategies to maintain gastrointestinal health, especially in patients with gastrointestinal GVHD, in an effort to prevent subsequent enteric bacterial BSI and improve survival.

Risk factors and characteristics of blood stream infections in patients with newly diagnosed multiple myeloma

BackgroundPatients with multiple myeloma are generally immune-compromised either due to pronounced depression in primary antibody responses or because of anti-myeloma therapy. Infection is a major risk factor for early deaths among these patients. The impact of blood stream infections (BSI) on newly diagnosed myeloma patients has been less studied. We aimed to study the incidence and risk factors of BSI within 3 months after diagnosis of multiple myeloma in a tertiary referral center.MethodsBetween November 2002 and December 2008, consecutive patients with multiple myeloma in Taipei Veterans General Hospital were retrospectively enrolled. Characteristics of patients with or without BSI were collected. Possible factors associated with development of BSI were analyzed by Cox regression.ResultsThere were a total of 222 patients. The incidence of BSI within 3 months after diagnosis is 11.7%. The patients with BSI had poorer survival outcomes than those without (mortality rate: 50% vs. 20.9%, p < 0.001). Moreover, advanced International Staging System stage (stage III vs. I/II: odds ratio [OR] 2.69, p = 0.049) and poor Eastern Cooperative Oncology Group (ECOG) performance status (ECOG > 2 vs. ≤ 2: OR 3.58, p = 0.005) were the independent risk factors of BSI, whereas immunoglobulin deficiency and low absolute lymphocyte count were not associated with risk of BSI development.ConclusionsOur study highlights the characteristic of myeloma patients with BSI and the importance of disease and host factors on risk of BSI. Myeloma patients with risks of BSI should be properly managed to reduce early mortality.

Impact of bloodstream infections on catheter colonization during extracorporeal membrane oxygenation.

There are concerns about secondary extracorporeal membrane oxygenation (ECMO) catheter infections in bacteremic patients. We investigated the association between blood stream infection (BSI) and ECMO catheter colonization. From January 2012 to August 2014, 47 adults who received ECMO support were enrolled. The ECMO catheter tip was cultured at the end of the ECMO procedure. The enrolled patients were classified into two groups according to the presence of BSI during ECMO support and analyzed with respect to ECMO catheter colonization. Of 47 cases, BSI during ECMO was identified in 13 patients (27.7%). ECMO catheter colonization was identified in 6 (46.2%) patients in the BSI group and 3 (8.8%) in the non-BSI group. BSI during ECMO support was independently associated with ECMO catheter colonization [odds ratio (OR) 5.55; 95% confidence interval (CI) 1.00-30.73; p=0.049]. The organisms colonizing ECMO catheters in the setting of primary BSI were predominantly Gram-positive cocci and Candida species. Acinetobacter baumannii was the most common colonizing pathogen in the setting of secondary BSI. All the organisms colonizing ECMO catheters were multi-drug resistant organisms, including methicillin-resistant S. aureus, Candida glabrata, and carbapenem-resistant A. baumannii. ECMO catheters may become contaminated with multi-drug resistant pathogens in the presence of BSI. Therefore, ECMO should be applied cautiously in septic patients with bacteremia caused by multi-drug resistant pathogens.

Bloodstream infections as a marker of community-acquired sepsis severity. Results from the Portuguese community-acquired sepsis study (SACiUCI study)

The impact of bloodstream infection (BSI) on admission to hospital on the outcome of patients with community-acquired sepsis (CAS) admitted to intensive-care units (ICU) is largely unknown. We selected 803 adult patients consecutively admitted with CAS to one of 17 Portuguese ICU, in whom blood cultures were collected before initiation of antibiotic therapy during a 12-month period. A BSI was identified on hospital admission in 160 (19.9%) patients. Those with and without BSI had similar mean Simplified Acute Physiology Score (SAPS) II and age. The presence of BSI was independently associated with mortality in ICU (adjusted odds ratio 1.86; 95% confidence interval 1.20–2.89; p 0.005). On the 4th day in ICU, patients with BSI were found to be significantly more dependent on vasopressor support (p 0.002) but not on ventilatory support. Cumulative ICU mortality was significantly higher in BSI patients from the 9th day onwards. A seasonal variation of BSI isolates was noted: gram-negative BSI were more common in the summer, whereas in the winter, gram-positive infections were more frequent (p 0.024), without mortality differences.

Impact of bloodstream infections on outcome and the influence of prophylactic oral antibiotic regimens in allogeneic hematopoietic SCT recipients

This study aimed to determine the impact of blood stream infections (BSIs) on outcome of allogeneic hematopoietic SCT (HSCT), and to examine the influence of old (non-levofloxacin-containing) and new (levofloxacin-based) prophylactic antibiotic protocols on the pattern of BSIs. We retrospectively enrolled 246 allogeneic HSCT recipients between January 1999 and June 2006, dividing patients into BSI (within 6 months post-HSCT, n=61) and non-BSI groups (n=185). We found that Gram-negative bacteria (GNB) predominated BSI pathogens (54%). Multivariate analyses showed that patients with a BSI, compared with those without, had a significantly greater 6-month mortality (hazard ratio, 1.75; 95% confidence interval, 1.09-2.82; P=0.021) and a significantly increased length of hospital (LOH) stay (70.8 vs 55.2 days, P=0.014). Moreover, recipients of old and new protocols did not have a significantly different 6-month mortality and time-to-occurrence of BSIs. However, there were significantly more resistant GNB to third-generation cephalosporins and carbapenem in recipients of levofloxacin-based prophylaxis. Our data suggest that BSIs occur substantially and impact negatively on the outcome and LOH stay after allogeneic HSCT despite antibiotic prophylaxis. Levofloxacin-based prophylaxis, albeit providing similar efficacy to non-levofloxacin-containing regimens, may be associated with increased antimicrobial resistance.

Blood stream infection (BSI) and acute GVHD after hematopoietic SCT (HSCT) are associated

BSI and acute GVHD (aGVHD) are serious complications of HSCT. We hypothesized that the two events were not independent of one another. We studied (1) associations between BSI and aGVHD; (2) the impact of BSI and/or aGVHD on death within 100 days after HSCT, employing a retrospective cohort analysis. Risk factor analysis was performed using multivariable Cox proportional hazards analyses. Of 211 subjects undergoing allogeneic HSCT from 1/00–12/05 (58% of whom underwent reduced intensity transplantation), 82 (39%) developed BSI. In 49 patients (23%), grades (gr) 2–4 aGVHD occurred. Early BSI was independently associated with an increased occurrence of subsequent aGVHD gr 2–4. Cytomegalovirus seropositivity was independently associated with decreased occurrence of aGVHD. Acute GVHD gr 2–4 independently predicted subsequent first BSI. Both BSI and aGVHD gr 2–4 were significant independent predictors of death within 100 days after HSCT. There is a strong, independent association between BSI and aGVHD. Potential explanations include the elaboration of cytokines during BSI favoring the development of aGVHD and/or the immunosuppressive treatment of aGVHD favoring the development of BSI. Future studies should be directed at mechanistic investigations of this association.

Impact of Bloodstream Infection on the Outcome of Children Undergoing Cardiac Surgery

Bloodstream infections (BSIs) are a main cause of nosocomial infection in the critical care area. The development of BSI affects the surgical outcome and increases intensive care unit (ICU) morbidity and mortality. This prospective cohort study was undertaken to determine the incidence, etiology, risk factors, and outcome of BSI for postoperative pediatric cardiac patients in the pediatric cardiac ICU setup. All postoperative pediatric patients admitted to the pediatric cardiac ICU from January 2007 to December 2007 were included in the study. Data were prospectively collected using a standardized data collection form. Patients with BSI (group 1) were compared with non-BSI patients (group 2) in terms of age, weight, surgical complexity score, duration of central line, need to keep the chest open postoperatively, and the length of the pediatric cardiac ICU and hospital stay. Of the 311 patients who underwent cardiac surgery during the study period, 27 (8.6%) were identified as having BSI (group 1). The 311 patients included in the study had a total of 1,043 central line days and a catheter-related BSI incidence density rate of 25.8 per 1,000 central line days. According to univariate analysis, the main risk factors for the development of BSI after pediatric cardiac surgery were lower patient weight (p = 0.005), high surgical complexity score (p < 0.05), open sternum postoperatively (p < 0.05), longer duration of central lines (p < 0.0001), and prolonged pediatric cardiac ICU and hospital stay (p < 0.0001). Gram-negative organisms were responsible for 67% of the BSI in the pediatric cardiac ICU, with pseudomonas (28%) and enterobacter (22%) as the main causative organisms. The mortality rate in the BSI group was 11% compared with 2% in the non-BSI group. In our pediatric cardiac ICU, BSI developed in 8.6% of the children undergoing cardiac surgery, mainly caused by a Gram-negative organism. The main risk factors for BSI in the postoperative pediatric cardiac patient were high surgical complexity, open sternum, low body weight, longer duration of central line, and prolonged pediatric cardiac ICU stay.

Fenotipagem de bactérias isoladas em hemoculturas de pacientes críticos

Bloodstream infections are a serious complication among critical patients. The detection of microbial pathogens in blood cultures is an important diagnostic tool. This study aimed to isolate and characterize bacteria from the blood of patients admitted to the clinical intensive care unit of a teaching hospital, between April 2003 and April 2004. The bacteria isolated were identified by biochemical/enzymatic tests and detection of the antimicrobial susceptibility profile using the disk diffusion method. A total of 304 blood cultures from 195 patients were evaluated. Forty-nine (16.1%) of the blood cultures presented microbe development. The predominant species was Pseudomonas stutzeri (18.2%). Gram-positive cocci and enterobacteria showed greater resistance to ampicillin; vancomycin and linezolid were the most active agents for Gram-positive cocci and carbapenems for Gram-negative rods. Because of the impact of bloodstream infection within the hospital context, additional studies are needed in order to give backing for prevention and control measures.

Bacteremia in hospitalized patients with human immunodeficiency virus: A prospective, cohort study.

BackgroundBacterial infections complicate the course of patients with human immunodeficiency virus infection. The purpose of this study was to describe the bacterial pathogens causing blood stream infection, identify the risk factors for the development of blood stream infection and determine the impact of blood stream infection on the outcome of patients infected with human immunodeficiency virus.MethodsThe incidence, etiology, risk factors and outcome of bacterial blood stream infection were prospectively determined in 1,225 consecutive hospitalizations of adults with human immunodeficiency virus infection.ResultsBlood stream infection occurred in 88 hospitalizations (7%); 73 of 89 infections (82%) were community acquired. The most commonly isolated gram-positive organism was Streptococcus pneumoniae (21); gram-negative, Escherichia coli (14). Blood stream infection was detected in 8% of African Americans and 22% of Hispanics compared with 2% of whites (P = 0.0013). Patients with blood stream infection had higher white blood cell counts (median, 6.5 vs. 4.9 × 109/L; P = 0.0002) and mortality (18% vs. 4%; P < 0.0001) than patients without infection.ConclusionsIn patients with human immunodeficiency virus, blood stream infection is associated with an increased mortality rate. Recognition of the incidence, etiology, and risk factors of blood stream infection in patients with human immunodeficiency virus infection could lead to measures that reduce the increased mortality.

Impact of bloodstream infection on outcomes among infected surgical inpatients.

To assess the importance of bloodstream infection (BSI) to outcomes among infected surgical patients. Bloodstream infection complicating infection is thought to connote a more serious condition compared with a primary infection alone. The authors recently reported, however, that BSI does not alter outcomes with central venous catheter colonization in the presence of sepsis. The significance of BSI with other infections has been incompletely evaluated. Data on all episodes of infection among surgical patients were collected prospectively during a 38-month period at a single hospital, then analyzed retrospectively to determine the independent prognostic value of BSI for all infections by logistic regression analysis, and for abdominal infections and pneumonia using matched control groups. During the study period, 2,076 episodes of infection occurred, including 363 with BSI. Patients with BSI had a greater severity of illness and a greater death rate. After logistic regression, however, BSI did not independently predict death. After matching patients with abdominal infections and pneumonia with BSI to patients without BSI but with a similar site of infection, severity of illness, age, and causative organism, no difference in outcome was seen. Bloodstream infection is associated with critical illness and death but appears to be a marker of severe primary disease rather than an independent predictor of outcome.