Background: Serratia marcescens has recently been categorized as low-risk for AmpC beta-lactamase inducible production, but research on outcomes in Serratia bacteremia by antibiotic choice is limited. Objectives: This study examined the clinical characteristics and outcomes of patients with ceftriaxone-susceptible Serratia bacteremia who received AmpC-directed beta-lactam therapy vs. narrower spectrum therapies. Materials and methods: Records of hospitalized adults with at least one positive blood culture for Serratia, over an 8-year period, across seven hospitals in an integrated health care system, were reviewed. Results: Of the 73 identified patients, 17 (23.3%) received carbapenem-based therapy. More than half of cases were community-acquired, with urological and intravenous drug use being the most common sources. While there was a trend toward lower mortality in carbapenem-treated patients (14.8 vs. 0%; p = 0.10), this was not statistically significant. The composite outcome of clinical failure was also not significant. However, compared to non-carbapenem-treated patients, carbapenem-treated patients had longer treatment duration (13 vs. 15 days; p = 0.02), prolonged hospital stays (5 vs. 11 days; p < 0.001), and higher infection-related readmission rates (17.6 vs. 3.6%; p = 0.04). A subset analysis of the 56 non-carbapenem treated patients found no significant difference in 30-day mortality or clinical failure between cefepime and non-cefepime-containing subgroups. Conclusion: Our study found that cefepime- or carbapenem-based therapy may have limited clinical relevance in the treatment of Serratia bacteremia when the strains are initially susceptible to ceftriaxone, highlighting the importance of antibiotic stewardship to prevent emergence of multidrug resistant organisms.

Background Propofol, a commonly used agent for short- and long-term sedation, is associated with acute pancreatitis. The main indirect mechanism of propofol-associated acute pancreatitis is by inducing hypertriglyceridemia. Patients with severe coronavirus disease 2019 (COVID-19) pneumonia often require prolonged mechanical ventilation and sedation. We examined the incidence rate of acute pancreatitis among critically ill adults with COVID-19 pneumonia on mechanical ventilation receiving propofol. In addition, we attempted to determine cutoff levels of serum triglycerides and doses of propofol that are predictive of propofol-associated acute pancreatitis.Methods This was a multicenter retrospective cohort study using a large dataset of hospitalized patients with COVID-19. The collected data included the number of days on propofol, cumulative doses of propofol, peak levels of serum triglycerides, serum lipase levels, and abdominal imaging findings. We used receiver-operating characteristic analysis in conjunction with Youden's index to identify the optimal thresholds for propofol administration parameters and levels of triglycerides that would provide maximal sensitivity and specificity for predicting acute pancreatitis.Results Out of 499 critically ill patients with COVID-19 pneumonia, 154 met the inclusion criteria. Six (4%) patients had suspected acute pancreatitis based on elevated serum lipase levels. Cutoff values greater than 688 mg/dL for peak level of triglycerides, 4.5 days on propofol, 3007 mg/day for average daily propofol dose, and 24 113 mg for cumulative propofol dose were associated with high risk of suspected acute pancreatitis. The negative predictive values for suspected acute pancreatitis using these cutoffs ranged from 98% to 100%.Conclusions Propofol use in critically ill COVID-19 patients is associated with a low incidence rate of acute pancreatitis. We identified cutoff values for serum triglycerides and cumulative propofol dose that are linked to higher risk of propofol-associated pancreatitis. More research is needed to examine the true incidence of propofol-associated pancreatitis and help develop optimal cutoff values for certain parameters to help guide safe propofol administration.

INTRODUCTION:Arteriovenous fistulas and grafts are lifelines for most hemodialysis patients, and a low access flow rate often requires patency-related intervention, such as angioplasty or thrombectomy, to prevent access failure. We examined whether early access flow rate, measured after initial fistula/graft cannulation, predicts vascular access patency-related intervention within 1 year. METHODS:This was a single-center retrospective cohort study. Among 172 patients undergoing surgical creation of a fistula/graft, 52 (30.2%) had documented access flow rates measurement by the Transonic™ ultrasound dilution technique, performed within an average of 48 days from initial access cannulation. The need for a patency-related intervention, defined as undergoing a fistulogram, angioplasty, thrombectomy, or surgical revision, was ascertained within 1 year. A receiver-operating characteristic curve (ROC) was generated to evaluate the diagnostic performance of first and average access flow rates for predicting patency-related intervention within 1 year. FINDINGS:Twenty-eight (53.8%) of the 52 study subjects required a patency-related intervention within 1 year. Their characteristics were not significantly different from those who did not require patency-related interventions. However, first access flow rates were significantly lower in patients requiring patency-related intervention compared to those who did not (898 vs. 1471 mL/min; p = 0.003), as were average access flow rates (841 vs. 1506 mL/min; p < 0.001). The ROC analyses revealed that first access flow rates and average access flow rates predicted the need for patency-related intervention within 1 year, with an area under-the-ROC curve of 0.743 (95% confidence interval [CI] 0.608, 0.877) and 0.775 (95% CI 0.648, 0.903), respectively, demonstrating acceptable discrimination. DISCUSSION:In adults undergoing hemodialysis, early access flow rate measurement can predict patency-related intervention within 1 year after initial vascular access cannulation. Additional studies are required to confirm these findings and identify optimal access flow rate cut-off values to predict vascular accesses at higher risk of stenosis.

Purpose: This study examines whether excessive adipose tissue, as measured by the body mass index (BMI), is associated with higher systemic markers of inflammation and higher risk of severe acute organ failure among patients with coronavirus disease 2019 (COVID-19). Methods: This was a multicenter retrospective cohort study of 1370 hospitalized adults (18 years or older) with COVID-19 during the first wave of the pandemic. Patient-level variables were extracted from the electronic medical record. The primary predictor variable was the BMI at time of hospital admission, in accordance with the World Health Organization classification. Multivariable logistic regression analyses examined the association of BMI with the composite of acute respiratory distress syndrome (ARDS), as defined by the use of high-flow nasal canula, non-invasive ventilation, or mechanical ventilation, severe acute kidney injury (AKI), as defined by acute dialysis requirement, or in-hospital death. Results: After adjustment for important cofounders, the BMI stratum of > 40 kg/m(2) (compared to the BMI < 25 kg/m(2) reference group) was associated with higher odds for the composite of ARDS, severe AKI, or in-hospital death (adjusted odds ratio [ORadj] 1.6995% confidence interval [CI]1.03, 2.78). As a continuous variable, BMI (per 5-kg/m(2) increase) remained independently associated with the composite outcome (ORadj 1.13; 95% CI 1.03, 1.23); patients in higher BMI categories exhibited significantly higher peak levels of C-reactive protein (CRP), a systemic marker of inflammation (P = .01). In a sub-cohort of 889 patients, the association of BMI with the composite outcome was no longer significant after adjustment for the peak level of CRP. Conclusions: Among hospitalized patients with COVID-19, a higher BMI is associated with higher risk of severe organ failure or in-hospital death, which dissipates after adjustment for CRP level. This supports the hypothesis that inflammation is a downstream mediator of adipose tissue on acute organ dysfunction.

Introduction: Multiple myeloma (MM) frequently involves the kidneys, resulting in acute, subacute, or chronic kidney disease (CKD). Patient- and treatment-related factors are associated with the long-term development of CKD. The aim of our study was to examine the association of serum free light chain (FLC) levels, measured at the time of diagnosis of MM, and CKD at subsequent follow-up. Methods: Patients with newly diagnosed MM were identified using cancer registries at five hospitals. The primary outcome was low eGFR (<60 mL/min/1.73 m2) or dialysis dependence and a secondary composite outcome of low eGFR, dialysis dependence, or death at the last follow-up, up to 12 months from diagnosis. Logistic regression analyses were performed. Results: A total of 149 patients met the inclusion criteria. Patients with an FLC level above the median had a higher frequency of hypertension (54% vs. 81%; p < 0.001), hyperlipidemia (37% vs. 56%; p = 0.018), low eGFR at the time of diagnosis (43% vs. 66%; p = 0.006), and a higher MM stage (p = 0.018). On multivariable analyses, after adjustment for several covariates, serum FLC level (per each 100 mg/L) was independently associated with low eGFR or dialysis dependence at follow-up (adjusted odds ratio [aOR] 1.021; 95% CI: 1.002, 1.041; p = 0.033). This association persisted for the composite outcome of low eGFR, dialysis dependence, or death (aOR 1.034; 95% CI: 1.006, 1.063; p = 0.018). Discussion/Conclusion: Higher serum FLC level measured at the time of MM diagnosis is independently associated with CKD at up to 12 months of follow-up.

Heart failure is a leading cause of hospitalisations. Integration of palliative care services with medical therapy in the management of hospitalised patients with heart failure is imperative. Unfortunately, there are no standardised criteria for palliative care referrals among hospitalised patients with acute decompensated heart failure. The objective of our quality improvement project was to develop and implement a palliative care consult trigger tool for hospitalised patients with acute decompensated heart failure. We found that among eligible patients, palliative care referrals were underused, likely contributing to misalignment of goals of care and suboptimal advance care planning. We developed a trigger tool and designed and implemented structured multicomponent educational interventions to improve the appropriateness and timeliness of inpatient palliative care consultations in this high-risk population. The educational interventions led to a significant increase in the rate of appropriate inpatient palliative care consultations among hospitalised patients with acute decompensated heart failure (46.3% vs 27.7%; p=0.02). In addition, palliative care referrals resulted in better alignment of goals of care at the time of hospital discharge, as measured by a significant increase in the completion rate of a healthcare proxy form (11.4% vs 47.2%; p<0.001) and a Medical Order for Life-Sustaining Treatment form (2.0% vs 24.1%; p<0.001), as well as the establishment of a Do-Not-Resuscitate order (2.7% vs 29.6%; p<0.001). Furthermore, the intervention resulted in a significant decrease in the hospital readmission rate up to 90 days post-discharge (43.6% vs 8.3%; p<0.001). This quality improvement project calls for the development and adoption of standardised criteria for palliative care referrals to benefit hospitalised patients with heart failure and reduce symptom burden, align goals of care and improve quality of life.

Minimal change disease (MCD) is a well-known cause of fulminant acute nephrotic syndrome (NS) and has been associated with thrombotic complications. We report the case of a 51-year-old woman with previous biopsy-proven MCD in remission who presented with worsening headache and acute confusion shortly after a relapse of the NS and was diagnosed with cerebral venous thrombosis (CVT) complicated by intracranial hemorrhage and midline shift. One month prior, she had been initiated on an oral contraceptive agent during remission of the NS. After initiation of systemic anticoagulation, her condition rapidly deteriorated, and she passed away before being able to undergo catheter-based venous thrombectomy. We conducted a systematic literature review and identified 33 case reports of adults with NS-associated CVT. The most common symptoms were headache (83%), nausea or vomiting (47%), and altered mental status (30%). 64% of patients presented at time of initial diagnosis of the NS and 32% during a relapse. Mean urinary protein excretion was 9.32 g/day and mean serum albumin was 1.8 g/dL. 91% of patients received systemic anticoagulation, and 19% died. The outcome in the remaining cases was favorable with only one report (5%) of residual neurological deficit. Of the available kidney biopsy results, MCD was the most common diagnosis (70%), raising the hypothesis that the fulminant acute onset of the NS might be a predisposing factor for this serious thrombotic complication. Clinicians should have a high index of suspicion for CVT in patients with the NS who present with new-onset neurological symptoms, including headache and nausea.

Abstract Background Serratia Marcescens causes serious infections. Carbapenems were prescribed due to the bacterium’s ability to develop inducible AmpC-mediated resistance. Recent IDSA guidance recommends ceftriaxone and in high-burden cases, cefepime. Evidence on the role of cefepime in the treatment of Serratia bacteremia is scarce. We aim to evaluate the outcomes of patients who received cefepime-containing empiric and/or definitive therapy (CFCT) to those receiving non-cefepime therapy (NCFCT). Methods This is a sub-analysis of a retrospective study of 7 Massachusetts acute care hospitals from January 1, 2015, to October 31, 2022. We included hospitalized adults (≥18 years) with Serratia Marcescens bacteremia. IRB approval was obtained. Demographics, clinical course characteristics, and choice of antibiotic therapy were collected. Primary outcome was 30-day mortality, and secondary outcome was composite antimicrobial failure (see Definitions in Table 1). Chi Square and Mann-Whitney U tests were computed using SPSS statistical package. Results The original Carbapenem-Serratia study had 73 out of 128 patients who met the inclusion criteria (Figure 1). The non-carbapenem group (n=56) was further studied for the purpose of this subanalysis and was divided into CFCT (n=15) and NCFCT (n=41). The two subgroups were similar in baseline comorbidities, severity measures, and sources of bacteremia (Table 1). Neither 30-day mortality nor the composite outcome of antimicrobial failure were significantly different with relative risks of 0.94 (95% CI 0.16 to 5.3, P=0.948) and 1.21 (95% CI 0.27 to 5.4, P=0.800), respectively. Study exclusion flow-chart with subanlaysis. ESBL phenotypically defined by ceftriaxone resistance (MIC <1). Characteristics and outcomes of patient with Serratia bacteremia treated with a cefepime versus non-cefepime nor carbapenem therapy regimen. * Immunocompromised patients are those receiving immunosuppressants, chemotherapy, or transplants, having HIV with CD4+ T cell count <200 cells/mm3, neutropenia with ANC < 500 cells/mm3, or corticosteroid use with prednisone or equivalent >10 mg for ≥ 14 days. † Hospital-acquired bacteremia is diagnosed when a positive blood culture obtained from patients hospitalized for 48 hours or longer. Healthcare-associated bacteremia was defined as a positive blood culture is obtained within 48 hours of hospital admission and the patient fulfills specific pre-defined criteria utilized in prior studies. Community-acquired bacteremia refers to positive a blood culture obtained within 48 hours after hospital admission in patients who do not fit the criteria for healthcare-associated infections. ‡ Deep seated complicated infection included Infective endocarditis, septic arthritis, osteomyelitis, or epidural abscess § Empiric antibiotic therapy: Antibiotics administered before antimicrobial susceptibility testing (AST) results, with a minimum 48-hour of uninterrupted duration and appropriate dosing. || Definitive antibiotic therapy (i.e., antibiotics administered after the AST results, also with a minimum of 48-hour duration). Duration of total definitive antibiotic therapy was counted from day of AST results until last day of definitive antimicrobial therapy. # Microbiological failure, microbiological relapse, in- hospital mortality, 30-day mortality, infection-related hospital readmission, or recurrent Serratia bateremia within 30 days. Microbiological failure refers to the growth of Serratia after 48 hours of definitive antibiotic therapy, while microbiological relapse is the regrowth of Serratia after a negative blood culture (Kunz Coyne et al., 2023). Note: Two patients had recurrence of Serratia bacteremia within 30 days, neither were resistant to third generation cephalosporins. Δ Infection-related re-admission was defined when a patient is readmitted not solely for a procedure or surgery, and they experience fever, worsening leukocytosis, or required escalation of antimicrobial therapy from the definitive therapy of the index admission. Conclusion Averting cefepime in the antimicrobial therapy of Serratia bacteremia is not associated with a significant increase in 30-day mortality or the composite outcome of antimicrobial failure. When applicable, a narrower beta-lactam therapy such as ceftriaxone may be appropriate. Limitations include a small sample size, with higher risk for type II error, and overlap in definitive antibiotic therapy. Further prospective studies are needed to confirm these findings, especially in patients with deep-seated infections. Disclosures All Authors: No reported disclosures

Abstract Background Serratia Marcescens causes serious infections. Carbapenems were preferred due to fear of inducible AmpC resistance. IDSA guidance now recommends ceftriaxone, and in high-burden cases, cefepime. Evidence on Serratia bacteremia treatment is limited. This study compares outcomes of cefepime or carbapenem (CPCT) vs. non-cefepime non-carbapanem containing definitive therapy (NCPCT) in non-ESBL Serratia bacteremia. Methods We retrospectively reviewed adults (≥18 years) with Serratia Marcescens bacteremia hospitalized in seven Massachusetts acute care hospitals (2015 - 2022) (Figure 1). Demographics, clinical course characteristics, and antibiotic therapy choices were obtained. Primary outcome was 30-day mortality, and secondary composite outcome was antimicrobial failure (Definitions in Table 1 and 2). Chi Square and Mann-Whitney U tests were computed using SPSS statistical package.Figure 1. Study exclusion flow-chart. ESBL phenotypically defined by ceftriaxone resistance (MIC <1) Results 69 out of 128 patients were included in the study. The mean age was 59.23 and 27.53% had IVDU disorder. 21.9 % of patients received CPCT while 78.1% were treated with NCPCT. Notably, more patients in the CPCT group received antibiotics in preceding 3 months, and had more ventilator associated pneumonia (VAP). Other baseline characteristics, bacteremia sources and severity of infection were similar between both groups (Table 1). CPCT patients had longer definitive therapy and more prolonged hospital stay, while more patients in the NCPCT group were switched to oral therapy (Table 2). Neither 30-day mortality rate (8.7% NCPCT vs. 5% CPCT, P= 0.602) nor antimicrobial failure rate (12.5 % NCPCT vs. 23.8% CPCT, P=0.238) was significantly different.Table 1. Clinical characteristics and bacteremia sources of patient with Serratia bacteremia treated with a cefepime or carbapenem versus a non-cefepime nor carbapenem therapy regimen. * Immunocompromised patients are those receiving immunosuppressants, chemotherapy, or transplants, having HIV with CD4+ T cell count <200 cells/mm3, neutropenia with ANC < 500 cells/mm3, or corticosteroid use with prednisone or equivalent >10 mg for ≥ 14 days. † Active IVDU is defined as Self-reported or clinical evidence (exam or urine toxicology screen) of active Injection Drug use. ‡ Recent surgery or procedure in the 30 days leading to the positive culture includes urological, Gastroenterological procedure (Endoscopy or Paracentesis), Gastroenterological surgery (Intra-abdominal surgery or peri-anal surgery), Neurosurgical, Respiratory, vascular or Musculoskeletal. § Hospital-acquired bacteremia is diagnosed when a positive blood culture obtained from patients hospitalized for 48 hours or longer. Healthcare-associated bacteremia was defined as a positive blood culture is obtained within 48 hours of hospital admission and the patient fulfills specific pre-defined criteria utilized in prior studies. Community-acquired bacteremia refers to positive a blood culture obtained within 48 hours after hospital admission in patients who do not fit the criteria for healthcare-associated infections. || Urological is defined by pyuria or positive urine cultures. All patients had Pyuria except for 3 patients, instead they had renal calculi and irritative urinary symptoms. Skin and/or soft tissue infection: Per noted clinical examination findings, with some cases supplemented by Serratia growth with Mod or High PMNs from clinical specimens. Ventilator associated pneumonia (VAP): mechanically ventilated for more than 48H before the positive respiratory cultures. Other cases had clinical evidence of infection around port of entry or blood cultures drawn from the line growing Serratia. Intra-abdominal infection included radiological evidence of abscess, diverticulitis, biliary Dilatation, or cholecystitis. All cases were found to have elevated alkaline phosphatase and/or bilirubin. Deep seated complicated infection included Infective endocarditis, septic arthritis, osteomyelitis, or epidural abscess. ¶ Source control included drainage or debridement of deep soft tissue infection, drainage of pleural effusion, drainage of intra-abdominal abscess, resolution of biliary obstruction, cholecystectomy, removal of vascular catheter, removal of indwelling catheter, resolution of urological obstruction and/or replacement of the nephrostomy tubeTable 2. Antibiotic choices and clinical outcomes of patient with Serratia bacteremia treated with a cefepime or carbapenem versus a non-cefepime nor carbapenem therapy regimen. * Empiric antibiotic therapy: Antibiotics administered before antimicrobial susceptibility testing (AST) results, with a minimum 48-hour of uninterrupted duration and appropriate dosing. † Duration of empiric therapy was counted from day one of first empiric therapy until day of AST result. Duration of total definitive antibiotic therapy was counted from day of AST results until last day of definitive antimicrobial therapy. ‡ Definitive antibiotic therapy (i.e., antibiotics administered after the AST results, also with a minimum of 48-hour duration). § Duration of antimicrobial spectrum therapy (DAST) was calculated as follows: In single definitive therapy, spectrum score, per Kakiuchi et al., 2021, was multiplied by the duration in days. In sequential and double antibiotic therapy, the DAST for each antibiotic were summed up. We excluded oral antibiotics prescribed upon discharge from this calculation. || Infection-related re-admission was defined when a patient is readmitted not solely for a procedure or surgery, and they experience fever, worsening leukocytosis, or required escalation of antimicrobial therapy from the definitive therapy of the index admission. ¶ Microbiological failure, microbiological relapse, in- hospital mortality, 30-day mortality, infection-related hospital readmission, or recurrent Serratia bateremia within 30 days. Microbiological failure refers to the growth of Serratia after 48 hours of definitive antibiotic therapy, while microbiological relapse is the regrowth of Serratia after a negative blood culture (Kunz Coyne et al., 2023). Note: Two patients had recurrence of Serratia bacteremia within 30 days, neither were resistant to third generation cephalosporins. Conclusion Our study found no significant difference in 30-day mortality or antimicrobial failure between CPCT and NCPCT groups. Furthermore, longer hospital stay was observed in CPCT patients, possibly due to cefepime and meropenem’s less suitability for outpatient antimicrobial therapy (OPAT). Our study is limited by its small size and the overlap in definitive antibiotic therapy. Our findings suggest narrower Beta-lactam therapy may be appropriate which may help early hospital discharge and less days of broad spectrum therapy. Prospective studies are needed to confirm these conclusions and contribute to safe antimicrobial stewardship. Disclosures All Authors: No reported disclosures

Abstract Background Carbapenems were commonly prescribed for "SPACE" organisms. Recent IDSA guidance recommends narrower-spectrum beta-lactams for lower AmpC-induction risk bacteria, like Serratia. Prior studies focused on other Enterobacterales, with limited evidence on Serratia bacteremia. This study compares carbapenem-containing (CBCT) and non-carbapenem-containing active empiric/definitive therapy (NCBCT) for Serratia bacteremia. Methods We retrospectively reviewed records of adults (age ≥18 years old) with Serratia bacteremia hospitalized in 7 hospitals in Massachusetts over 7 years (2015-2022). IRB approval was obtained. Baseline characteristics, treatment details and outcome variables were extracted from medical charts. Chi Square and Mann-Whitney U tests were computed using SPSS statistical package. Results 73 out of 128 patients were included in the study after applying exclusion criteria (Figure 1). Mean age was 58.8 years. CBCT was prescribed in 23.3%. No significant differences were observed in baseline characteristics, bacteremia sources or severity; however, CBCT patients had longer definitive therapy and more prolonged hospital stay (Table 1). The 30-day mortality rate was not significantly different between both groups (14.8% NCBCT vs. 0% CBCT, P=0.102). While there was no difference in antimicrobial failure with a relative risk of 1.415 (95% CI 0.38-5.26, P=0.603), the infection-related hospital readmission rate was significantly higher in the CBCT group. Study exclusion flow-chart. ESBL phenotypically defined by ceftriaxone resistance (MIC <1) Characteristics and outcomes of patient with Serratia bacteremia treated with a carbapenem versus a non-carbapenem therapy regimen. * Immunocompromised patients are those receiving immunosuppressants, chemotherapy, or transplants, having HIV with CD4+ T cell count <200 cells/mm3, neutropenia with ANC < 500 cells/mm3, or corticosteroid use with prednisone or equivalent >10 mg for ≥ 14 days. † Hospital-acquired bacteremia is diagnosed when a positive blood culture obtained from patients hospitalized for 48 hours or longer. Healthcare-associated bacteremia was defined as a positive blood culture is obtained within 48 hours of hospital admission and the patient fulfills specific pre-defined criteria utilized in prior studies. Community-acquired bacteremia refers to positive a blood culture obtained within 48 hours after hospital admission in patients who do not fit the criteria for healthcare-associated infections. ‡ Deep seated complicated infection included Infective endocarditis, septic arthritis, osteomyelitis, or epidural abscess § Empiric antibiotic therapy: Antibiotics administered before antimicrobial susceptibility testing (AST) results, with a minimum 48-hour of uninterrupted duration and appropriate dosing. || Definitive antibiotic therapy (i.e., antibiotics administered after the AST results, also with a minimum of 48-hour duration). Duration of total definitive antibiotic therapy was counted from day of AST results until last day of definitive antimicrobial therapy. # Microbiological failure, microbiological relapse, in- hospital mortality, 30-day mortality, infection-related hospital readmission, or recurrent Serratia bateremia within 30 days. Microbiological failure refers to the growth of Serratia after 48 hours of definitive antibiotic therapy, while microbiological relapse is the regrowth of Serratia after a negative blood culture (Kunz Coyne et al., 2023). Note: Two patients had recurrence of Serratia bacteremia within 30 days, neither were resistant to third generation cephalosporins. Δ Infection-related re-admission was defined when a patient is readmitted not solely for a procedure or surgery, and they experience fever, worsening leukocytosis, or required escalation of antimicrobial therapy from the definitive therapy of the index admission. Conclusion We observed no significant differences in antimicrobial failure or mortality between CBCT and NCBCT groups. Narrower beta-lactam therapy may be appropriate when possible. In fact, CBCT was associated with prolonged hospital length of stay, which may be due to challenges in switching to outpatient therapy and discharging to lower acuity care settings. CBCT was also associated with more infection-related readmissions, which could be attributed to patient characteristics (IVDU and deep-seated infections) and frequent dosing requirements of meropenem impacting adherence. Our retrospective study is limited by a small size and overlap in definitive therapy and further prospective studies are needed to confirm our findings. Disclosures All Authors: No reported disclosures

Renal vein thrombosis (RVT), defined as the presence of a thrombus in the major renal vein or one of its tributaries, can present acutely or go unnoticed resulting in acute kidney injury or chronic kidney disease. RVT is associated with multiple etiologies, including nephrotic syndrome, thrombophilia, autoimmune disorders, and malignancy. Patients with systemic lupus erythematosus (SLE), a multiorgan autoimmune disorder, are predisposed to coagulopathy and thus are at a higher risk of venous and arterial thromboembolism. We describe the case of a 41-year-old man with SLE and biopsy-proven membranous glomerulonephritis (WHO class V lupus nephritis) in clinical remission with no evidence of nephrotic range proteinuria who presented with macroscopic hematuria and was diagnosed with acute-on-chronic bilateral RVT. We discuss the different causes of RVT and compare the clinical presentation, diagnostic imaging findings, and management of acute and chronic RVT.

Background: Acute kidney injury (AKI) is a well-recognized complication of coronavirus disease 2019 (COVID-19). The short and long-term outcomes of patients who develop AKI have not been well characterized. Methods: In this multicenter retrospective cohort study, we describe the clinical characteristics and outcomes of critically ill adults with severe COVID-19 and AKI. Patient-level variables were extracted from the electronic medical record. Using nadir-to-peak serum creatinine, AKI was defined using the KDIGO definition. Multivariable logistic regression analyses examined factors associated with development of moderate-to-severe (stage 2–3) AKI, severe (stage-3) AKI, and the composite of renal replacement therapy (RRT) or in-hospital death. Results: Among 459 critically ill adults with COVID-19, 371 (80.1%) developed AKI, with 179 (37.9%) developing stage-3 AKI. Male gender, black and Asian/Native American race, lower baseline estimated glomerular filtration rate (eGFR), higher body mass index (BMI), and higher Acute Physiology and Chronic Health Evaluation (APACHE) IV score were more prevalent among patients with severe AKI, as were systemic markers of inflammation. On multivariable analysis, male gender, black and Asian/Native American race, higher APACHE IV score, lower baseline eGFR, and higher BMI (mainly the highest BMI stratum ≥35 kg/m2) were independently associated with higher stages of AKI severity. Male gender, lower baseline eGFR, and higher APACHE IV score were also independently associated with the composite of RRT or in-hospital death. Moderate-to-severe AKI and severe AKI were independently associated with in-hospital death, and there was a significant interaction between BMI and moderate-to-severe AKI for the outcome of in-hospital death. Among 83 (18.1%) patients who required RRT, 27 (32.5%) survived, and 12 (44.4%) remained dialysis-dependent at discharge. At 3 and 6 months, 5 (41.7%) and 4 (33.3%) remained dialysis-dependent, respectively. Conclusions: AKI is common in critically ill adults with COVID-19. Several patient-level risk factors are associated with higher stages of AKI severity. BMI might be an effect modifier of AKI severity for in-hospital death. Among AKI survivors, there is a high rate of short- and long-term dialysis dependence.

Heparin-induced thrombocytopaenia (HIT) is a serious complication of heparin therapy. Evidence-based guidelines recommend the use of the 4Ts scoring system to calculate pretest probability of HIT. However, this scoring system is often underused, and inappropriate testing can lead to increased morbidity, medical costs and length of hospital stay. We identified that inappropriate testing for HIT was common at our institution and implemented structured multicomponent educational interventions to evaluate the impact of education on the appropriateness of HIT testing. The educational interventions led to a significantly increased rate of appropriateness of HIT testing (69% vs 35%; p=0.001). In addition, the 4Ts score documentation rate significantly improved following the intervention (52% vs 17%; p=0.001). The rates of discontinuation of heparin products and initiation of alternative anticoagulation increased, although not statistically significantly. Educational interventions can improve compliance with evidence-based guidelines on appropriateness of testing for HIT.

Introduction: The maximal allowable contrast dose (MACD = 5 × body weight/serum creatinine) is an empiric equation that has been used and validated in several studies to mitigate the risk of contrast-induced acute kidney injury (CI-AKI). However, coefficient 5 (referred to as factor K) was empirically devised and never disputed. The aim of this study was to refine the MACD equation for the prediction of CI-AKI following percutaneous coronary interventions (PCIs). Methods: This is a single-center, retrospective cohort study of adults undergoing PCI. Electronic medical records were reviewed to identify patients who underwent PCI between 2010 and 2019, derived from the National Cardiovascular Data Registry Cath-PCI registry for our hospital. Factor K (defined as contrast volume × serum creatinine/body weight) was calculated for every patient. A receiver operating characteristic (ROC) curve was constructed, and the Youden index was used to identify the optimal cut-off value for factor K in predicting severe (stages 2–3) CI-AKI. Results: Of the 3,506 patients undergoing PCI, 255 (7.2%) developed CI-AKI, and 68 (26.7%) of the 255 experienced severe AKI. Factor K predicted all-stage CI-AKI (area under the ROC curve 0.649; 95% CI 0.611, 0.686) but had better performance for predicting severe (stages 2–3) AKI (0.736; 95% CI 0.674, 0.800). The optimal cut-off value for factor K in predicting severe CI-AKI was 2.5, with a corresponding sensitivity of 68.7% and specificity of 70.5%. On subgroup analyses, optimal cut-off values for factor K for high-risk groups were not significantly different from those of low-risk groups. Conclusion: Our study indicates that factor K in the MACD equation is an independent risk factor for the development of severe CI-AKI, with an optimal cut-off value of 2.5. If our findings are validated, the MACD equation should be revised to incorporate the coefficient of 2.5 instead of 5.

Patient safety, which includes adverse event reporting and routine collection of outcome measures, has become an increasingly important aspect of inpatient care worldwide. In the United States, the National Quality Forum leads the effort in developing such measures for use in payment and public reporting programs. However, choosing and prioritizing events to serve as patient safety indicators is difficult in a dynamically changing and complex healthcare environment. In this perspective, we propose that hospital-acquired acute kidney injury (HA-AKI), for example, contrast-induced and postoperative AKI, should be added to existing, more traditional measures, such as surgical site infections and patient falls. The article highlights the significance of HA-AKI as a common complication resulting from a multitude of diagnostic and therapeutic procedures, how it lends itself well to measuring patient safety, and how reporting of this complication can contribute to further improvement of patient safety and overall quality of care.

Malignancy-induced lactic acidosis (MILA), a rare paraneoplastic phenomenon, is mostly described with hematologic malignancies (lymphomas and leukemias) but has also been reported with solid tumors. It is a subset of type B lactic acidosis being mediated without evidence of tissue hypoperfusion. Lymphoma-induced lactic acidosis is often considered an oncologic emergency and is associated with an increased risk of mortality and poor prognosis. It has a complex pathophysiology centered in the "Warburg effect," i.e., the programming of cancer cells to depend on aerobic glycolysis for promotion of their proliferation and anabolic growth. The treatment of lymphoma-induced lactic acidosis is focused on prompt administration of chemotherapy. The role of alkali therapy in this setting is controversial and has limited proven benefit with a potential for worsening the lactic acidosis. If alkali therapy is used in the presence of severe acidemia to optimize cardiovascular status, it should be administered judiciously.

BACKGROUND:Infective endocarditis (IE) is associated with considerable morbidity and mortality. Given the opioid crisis and emergence of drug-resistant organisms, we sought to examine annual trends in hospitalization rates for IE and potential epidemiologic shift in the causative microorganisms among patients with and without injection drug use (IDU).METHODS:This was a single-center retrospective cohort study of hospitalized adults with IE. Annual trends in hospitalization rates were calculated (2011-2018), and patient characteristics and clinical outcomes were compared according to IDU status.RESULTS:Our cohort of 244 hospitalized patients with IE had a subset of 112 with IDU. The annual hospitalization rate for IE increased almost four-fold and was most notable among patients with IDU. The highest increase occurred in patients with Staphylococcus aureus-associated IE. Patients with IDU were younger, and more likely to be women with tricuspid valve vegetations and have IE due to methicillin-sensitive and methicillin-resistant Staphylococcus aureus. Patients without IDU were more likely to have central venous catheters with mitral and aortic valve vegetations and have IE due to Streptococcus and coagulase-negative Staphylococcus species. Patients without IDU had a higher requirement for cardiac surgery and higher 90-day mortality. Age was the only independent variable associated with 90-day mortality.CONCLUSIONS:The rising incidence of IE in younger and older persons is driven in part by the opioid public health crisis and higher prevalence of indwelling central venous catheters, respectively. Timely treatment of opioid use disorders and stewardship surrounding use of central venous catheters is urgently needed.

Introduction: The Coronavirus Disease 2019 (COVID-19) pandemic has had a variable worldwide impact, likely related to country-level characteristics. In this ecological study, we explored the association of COVID-19 case rates (per 100,000 people) and death rates (per 100,000 people) with country-level population health characteristics, economic and human development indicators, and habitat-related variables. Methods: To calculate country-level COVID-19 case and death rates, the number of cases and deaths were extracted from the Johns Hopkins Coronavirus Resource Center for 2020. Country-level population health characteristics, economic and human development indicators, and habitat-related variables were extracted from several publicly available online sources of international organizations. Results were tabulated according to world zones and country economies. Univariate and multivariable linear regression analyses were performed to examine determinants of COVID-19 case rates and death rates. Results: A total of 187 countries and territories were analyzed, with an aggregate COVID-19 case rate of 779 per 100,000 people, a death rate of 19 per 100,000 people, and a case-fatality rate of 2.4%. For country-level population health characteristics, a higher percentage rate of adults with obesity and a higher percentage rate of adults with high blood pressure was independently associated with a higher COVID-19 case rate, and a higher percentage rate of adults with obesity was associated with a higher COVID-19 death rate. For country-level economic and human development indicators, only a higher gross domestic product percentage rate spent on total health expenditure and a higher human development index was independently associated with a higher COVID-19 case rate and death rate. A higher percentage of urban population was independently associated with a higher COVID-19 death rate, whereas a higher income per capita was independently associated with a lower COVID-19 death rate. For country-level habitat-related variables, a higher average household size and a higher percentage rate of population with primary reliance on polluting fuels and technologies was independently associated with a lower COVID-19 case rate and death rate whereas a higher percentage rate of households with at least one-member age 65 years or over was associated with a higher case rate and death rates. Conclusion: This ecological study informs the need to develop country-specific public health interventions to better target populations at high risk for COVID-19, and test environmental interventions to prevent indoor transmission of SARS-CoV-2, taking into consideration population health characteristics, economic and human development indicators, and habitat-related variables that are unique to each country.

Abstract Background Vancomycin has been the mainstay of treatment for methicillin-resistant Staphylococcus aureus (MRSA) infective endocarditis (IE). MRSA reduced susceptibility to vancomycin is a growing threat. Data assessing the effect of vancomycin reduced susceptibility on outcomes is limited. Our study aimed to evaluate characteristics and outcomes of MRSA-related IE based on the minimum inhibitory concentration (MIC) to vancomycin Characteristics and outcomes of 51 patients with MRSA-related endocarditis according to the minimal inhibitory concentration (MIC) to vancomycin Methods IRB approval was obtained for a retrospective cohort study at a tertiary care center. Records of hospitalized adults diagnose with IE by ICD-9/ICD-10 CM codes were identified from 2011 to 2018. 51 patients had MRSA-related IE and were selected for the analysis. Demographic, microbiologic, Imaging and outcome variables were obtained. Characteristics and outcomes of patients with MRSA-related IE according to the MIC to vancomycin (≤ vs. > 1 mcg/mL) were compared Results 35.3% of patients had a MIC > 1 mcg/mL. 59% were men, mean age was 46±3 years old. 65% acquired the infection through injection drug use. Only 3.9% of patients had prosthetic valve IE. 35.3% had tricuspid valve vegetation, 25.5% mitral valve and 21.6% aortic valve vegetation. Two patients had IE possibly related to a PICC-line infection; both of these patients had a MIC to vancomycin >1 mcg/mL, suggestive of prolonged antibiotic therapy. All patients with MRSA-related IE were started empirically on vancomycin. Patients with a MIC > 1 mcg/mL were more likely to be switched to a combination of daptomycin and ceftaroline, compared to those with a MIC ≤ 1 mcg/mL (44.4% vs. 6.1%; P=0.001). 25.4% underwent valvular replacement within 6 months. 12% died within 90 days. MRSA-related IE with MIC > 1mcg/mL did not confer and an increase risk in in-hospital mortality (11.1% vs. 15.2%; P=0.67) or mortality at 90 days (11.1% vs. 12.5%; P=0.89). Conclusion In this single-center experience, we found that in 8 years 35% of patients with MRSA-related IE had MIC >1 mcg/mL. This is an alarming finding. Although our study did not reach statistic significance we didn’t found difference in valvular surgery requirement or mortality among those with MIC > 1mcg/d as compared to those with a more sensitive MRSA strain. A study with more power or a metha-analysis will be require to better answer this question. Disclosures All Authors: No reported disclosures