32 results on '"Larsen GY"'
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2. Clinical information transfer and medication reconciliation in patients transferred from the pediatric intensive care unit.
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Grant MC and Larsen GY
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- 2007
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3. Effect of an anonymous reporting system on near-miss and harmful medical error reporting in a pediatric intensive care unit.
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Grant MJC and Larsen GY
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- 2007
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4. Preventable harm occurring to critically ill children.
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Larsen GY, Donaldson AE, Parker HB, and Grant MJC
- Published
- 2007
5. Nutrition after head injury: Challenges and recommendations*.
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Statler KD and Larsen GY
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- 2012
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6. Standard drug concentrations and smart-pump technology reduce continuous-medication-infusion errors in pediatric patients.
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Larsen GY, Parker HB, Cash J, O'Connell M, and Grant MJC
- Abstract
OBJECTIVE: To determine if combining standard drug concentrations with 'smart-pump' technology reduces reported medication-infusion errors. DESIGN: Preintervention and postintervention comparison of reported medication errors related to infusion therapies during the calendar years 2002 and 2003. SETTING: A 242-bed university-affiliated tertiary pediatric hospital. INTERVENTION: Change in continuous-medication-infusion process, comprising the adoption of (1) standard drug concentrations, (2) 'smart' syringe pumps, and (3) human-engineered medication labels. MAIN OUTCOME MEASURES: Comparison of reported continuous-medication-infusion errors before and after the intervention. RESULTS: The number of reported errors dropped by 73% for an absolute risk reduction of 3.1 to 0.8 per 1000 doses. Preparation errors that occurred in the pharmacy decreased from 0.66 to 0.16 per 1000 doses; the number of 10-fold errors in dosage decreased from 0.41 to 0.08 per 1000 doses. CONCLUSIONS: The use of standard drug concentrations, smart syringe pumps, and user-friendly labels reduces reported errors associated with continuous medication infusions. Standard drug concentrations can be chosen to allow most neonates to receive needed medications without concerns related to excess fluid administration. [ABSTRACT FROM AUTHOR]
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- 2005
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7. Association of Diagnostic Stewardship for Blood Cultures in Critically Ill Children With Culture Rates, Antibiotic Use, and Patient Outcomes: Results of the Bright STAR Collaborative.
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Woods-Hill CZ, Colantuoni EA, Koontz DW, Voskertchian A, Xie A, Thurm C, Miller MR, Fackler JC, Milstone AM, Agulnik A, Albert JE, Auth MJ, Bradley E, Clayton JA, Coffin SE, Dallefeld S, Ezetendu CP, Fainberg NA, Flaherty BF, Foster CB, Hauger SB, Hong SJ, Hysmith ND, Kirby AL, Kociolek LK, Larsen GY, Lin JC, Linam WM, Newland JG, Nolt D, Priebe GP, Sandora TJ, Schwenk HT, Smith CM, Steffen KM, Tadphale SD, Toltzis P, Wolf J, and Zerr DM
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- Anti-Bacterial Agents therapeutic use, Blood Culture, Child, Critical Illness, Humans, Intensive Care Units, Pediatric, Prospective Studies, United States, Sepsis diagnosis, Sepsis drug therapy, Shock, Septic
- Abstract
Importance: Blood culture overuse in the pediatric intensive care unit (PICU) can lead to unnecessary antibiotic use and contribute to antibiotic resistance. Optimizing blood culture practices through diagnostic stewardship may reduce unnecessary blood cultures and antibiotics., Objective: To evaluate the association of a 14-site multidisciplinary PICU blood culture collaborative with culture rates, antibiotic use, and patient outcomes., Design, Setting, and Participants: This prospective quality improvement (QI) collaborative involved 14 PICUs across the United States from 2017 to 2020 for the Bright STAR (Testing Stewardship for Antibiotic Reduction) collaborative. Data were collected from each participating PICU and from the Children's Hospital Association Pediatric Health Information System for prespecified primary and secondary outcomes., Exposures: A local QI program focusing on blood culture practices in the PICU (facilitated by a larger QI collaborative)., Main Outcomes and Measures: The primary outcome was blood culture rates (per 1000 patient-days/mo). Secondary outcomes included broad-spectrum antibiotic use (total days of therapy and new initiations of broad-spectrum antibiotics ≥3 days after PICU admission) and PICU rates of central line-associated bloodstream infection (CLABSI), Clostridioides difficile infection, mortality, readmission, length of stay, sepsis, and severe sepsis/septic shock., Results: Across the 14 PICUs, the blood culture rate was 149.4 per 1000 patient-days/mo preimplementation and 100.5 per 1000 patient-days/mo postimplementation, for a 33% relative reduction (95% CI, 26%-39%). Comparing the periods before and after implementation, the rate of broad-spectrum antibiotic use decreased from 506 days to 440 days per 1000 patient-days/mo, respectively, a 13% relative reduction (95% CI, 7%-19%). The broad-spectrum antibiotic initiation rate decreased from 58.1 to 53.6 initiations/1000 patient-days/mo, an 8% relative reduction (95% CI, 4%-11%). Rates of CLABSI decreased from 1.8 to 1.1 per 1000 central venous line days/mo, a 36% relative reduction (95% CI, 20%-49%). Mortality, length of stay, readmission, sepsis, and severe sepsis/septic shock were similar before and after implementation., Conclusions and Relevance: Multidisciplinary diagnostic stewardship interventions can reduce blood culture and antibiotic use in the PICU. Future work will determine optimal strategies for wider-scale dissemination of diagnostic stewardship in this setting while monitoring patient safety and balancing measures.
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- 2022
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8. Improving Knowledge of Active Safety and QI Projects Amongst Practitioners in a Pediatric ICU.
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Flaherty BF, Hummel K, Vijayarajah S, White BR, Outsen S, and Larsen GY
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Introduction: The success of quality improvement (QI) projects depends on many factors, with communication and knowledge of project-specific practice change being fundamental. This project aimed to improve the knowledge of active safety and QI projects., Methods: Two interventions were trialed to improve knowledge: paired email and meeting announcements followed by a daily huddle to review ongoing projects. Knowledge, measured as the ability to recall a project and its practice change, was the primary outcome. The frequency and duration of the Huddle were process and balancing measures, respectively., Results: Seven days after a meeting/email announcement, 3 of 13 (23%) faculty and fellows recalled the announced practice change. Investigators then tested the effects of the Huddle by assessing practitioners' knowledge of safety and QI project-related practice changes on the first and last day of a service week. The average percentage of items recalled increased from the beginning to end of a service week by 33% [46% to 79%, 95% confidence interval (CI) 12-53] for faculty and 27% (51% to 77%, 95% CI 13-40) for fellows. The Huddle occurred in four of seven (interquartile range 2-5) days/wk with a mean duration of 4.5 (SD 2) minutes. Follow-up assessment 2 years after Huddle implementation demonstrate sustained increase in item recall [faculty +36% (95% CI +13% to 40%); fellows +35% (95% CI +23% to 47%)]., Conclusions: A daily huddle to discuss safety and QI project-related practice change is an effective and time-efficient communication method to increase knowledge of active projects., (Copyright © 2022 the Author(s). Published by Wolters Kluwer Health, Inc.)
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- 2022
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9. Medication and Fluid Management of Pediatric Sepsis and Septic Shock.
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Burgunder L, Heyrend C, Olson J, Stidham C, Lane RD, Workman JK, and Larsen GY
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- Anti-Bacterial Agents therapeutic use, Child, Fluid Therapy, Humans, Infant, Newborn, Resuscitation, Sepsis drug therapy, Shock, Septic drug therapy
- Abstract
Sepsis is a life-threatening response to infection that contributes significantly to neonatal and pediatric morbidity and mortality worldwide. The key tenets of care include early recognition of potential sepsis, rapid intervention with appropriate fluids to restore adequate tissue perfusion, and empiric antibiotics to cover likely pathogens. Vasoactive/inotropic agents are recommended if tissue perfusion and hemodynamics are inadequate following initial fluid resuscitation. Several adjunctive therapies have been suggested with theoretical benefit, though definitive recommendations are not yet supported by research reports. This review focuses on the recommendations for medication and fluid management of pediatric sepsis and septic shock, highlighting issues related to antibiotic choices and antimicrobial stewardship, selection of intravenous fluids for resuscitation, and selection and use of vasoactive/inotropic medications. Controversy remains regarding resuscitation fluid volume and type, antibiotic choices depending upon infectious risks in the patient's community, and adjunctive therapies such as vitamin C, corticosteroids, intravenous immunoglobulin, and methylene blue. We include best practice recommendations based on international guidelines, a review of primary literature, and a discussion of ongoing clinical trials and the nuances of therapeutic choices., (© 2022. The Author(s), under exclusive licence to Springer Nature Switzerland AG.)
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- 2022
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10. Best practices in pediatric sepsis: building and sustaining an evidence-based pediatric sepsis quality improvement program.
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Workman JK, Chambers A, Miller C, Larsen GY, and Lane RD
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- Child, Critical Care, Hospitals, Pediatric, Humans, Quality Improvement, Sepsis therapy, Shock, Septic therapy
- Abstract
Pediatric sepsis is a common problem worldwide and is associated with significant morbidity and mortality. Best practice recommendations have been published by both the American College of Critical Care Medicine and the Surviving Sepsis Campaign to guide the recognition and treatment of pediatric sepsis. However, implementation of these recommendations can be challenging due to the complexity of the care required and intensity of resources needed to successfully implement programs. This paper outlines the experience with implementation of a pediatric sepsis quality improvement program at Primary Children's Hospital, a free-standing, quaternary care children's hospital in Salt Lake City. The hospital has implemented sepsis projects across multiple care settings. Challenges, lessons learned, and suggestions for implementation are described. PLAIN LANGUAGE SUMMARY Sepsis is a life-threatening condition that results from an inappropriate response to an infection by the body's immune system. All children are potentially susceptible to sepsis, with nearly 8,000 children dying from the disease in the US each year. Sepsis is a complicated disease, and several international groups have published guidelines to help hospital teams treat children with sepsis appropriately. However, because recognizing and treating sepsis in children is challenging and takes a coordinated effort from many different types of healthcare team members, following the international sepsis guidelines effectively can be difficult and resource intensive. This paper describes how one children's hospital (Primary Children's Hospital in Salt Lake City, Utah) approached the challenge of implementing pediatric sepsis guidelines, some lessons learned from their experience, and suggestions for others interested in implementing sepsis guidelines for children.
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- 2021
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11. Development of a Quality Improvement Learning Collaborative to Improve Pediatric Sepsis Outcomes.
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Larsen GY, Brilli R, Macias CG, Niedner M, Auletta JJ, Balamuth F, Campbell D, Depinet H, Frizzola M, Hueschen L, Lowerre T, Mack E, Paul R, Razzaqi F, Schafer M, Scott HF, Silver P, Wathen B, Lukasiewicz G, Stuart J, Riggs R, Richardson T, Ward L, and Huskins WC
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- Child, Guideline Adherence, Hospitals, Pediatric, Humans, Practice Guidelines as Topic, United States, Education, Continuing, Outcome and Process Assessment, Health Care, Quality Improvement, Sepsis therapy
- Abstract
Pediatric sepsis is a major public health problem. Published treatment guidelines and several initiatives have increased adherence with guideline recommendations and have improved patient outcomes, but the gains are modest, and persistent gaps remain. The Children's Hospital Association Improving Pediatric Sepsis Outcomes (IPSO) collaborative seeks to improve sepsis outcomes in pediatric emergency departments, ICUs, general care units, and hematology/oncology units. We developed a multicenter quality improvement learning collaborative of US children's hospitals. We reviewed treatment guidelines and literature through 2 in-person meetings and multiple conference calls. We defined and analyzed baseline sepsis-attributable mortality and hospital-onset sepsis and developed a key driver diagram (KDD) on the basis of treatment guidelines, available evidence, and expert opinion. Fifty-six hospital-based teams are participating in IPSO; 100% of teams are engaged in educational and information-sharing activities. A baseline, sepsis-attributable mortality of 3.1% was determined, and the incidence of hospital-onset sepsis was 1.3 cases per 1000 hospital admissions. A KDD was developed with the aim of reducing both the sepsis-attributable mortality and the incidence of hospital-onset sepsis in children by 25% from baseline by December 2020. To accomplish these aims, the KDD primary drivers focus on improving the following: treatment of infection; recognition, diagnosis, and treatment of sepsis; de-escalation of unnecessary care; engagement of patients and families; and methods to optimize performance. IPSO aims to improve sepsis outcomes through collaborative learning and reliable implementation of evidence-based interventions., Competing Interests: POTENTIAL CONFLICT OF INTEREST: Multiple authors, as members of the Children’s Hospital Association’s Improving Pediatric Sepsis Outcomes Steering Committee, received travel reimbursements after attendance at biannual leadership meetings (Drs Auletta, Balamuth, Brilli, Depinet, Hueschen, Huskins, Kandil, Larsen, Macias, Mack, Niedner, Paul, Razzaqi, Schafer, Scott, Silver, and Stalets, and Ms Campbell, Ms Dykstra-Nykanen and Ms Wathen). Dr Scott’s institution is receiving ongoing career development salary support from the Agency of Healthcare Research and Quality (K08HS025696). Dr Scott’s institution is receiving ongoing grant support from the Eunice Kennedy Shriver National Institute of Child Health and Human Development for a research grant (R01HD087363). Dr Huskins reports receiving a consulting fee from ADMA Biologics, Inc. Dr Fitzgerald (collaborator) reports that, in the past, she received support as a coinvestigator on National Institutes of Health grant R43HD096961, and currently, she receives support as a coinvestigator on National Institutes of Health grant K23DK119463. Ms Wilson (collaborator) reports receiving travel reimbursements for conference presentations for the American Society of Pediatric Nephrology and receiving an award from the American Association of Critical Care Nurses in 2017; the other authors have indicated they have no potential conflicts of interest to disclose., (Copyright © 2021 by the American Academy of Pediatrics.)
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- 2021
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12. Evaluating Pediatric Sepsis Definitions Designed for Electronic Health Record Extraction and Multicenter Quality Improvement.
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Scott HF, Brilli RJ, Paul R, Macias CG, Niedner M, Depinet H, Richardson T, Riggs R, Gruhler H, Larsen GY, Huskins WC, and Balamuth F
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- Adolescent, Child, Child, Preschool, Female, Hospital Mortality trends, Humans, Immunocompromised Host physiology, Infant, Length of Stay statistics & numerical data, Male, Organ Dysfunction Scores, Positive-Pressure Respiration, Reproducibility of Results, Sepsis mortality, Severity of Illness Index, Shock, Septic mortality, Shock, Septic therapy, Electronic Health Records statistics & numerical data, Hospitals, Pediatric statistics & numerical data, Intensive Care Units, Pediatric statistics & numerical data, Quality Improvement organization & administration, Sepsis therapy
- Abstract
Objectives: To describe the Children's Hospital Association's Improving Pediatric Sepsis Outcomes sepsis definitions and the identified patients; evaluate the definition using a published framework for evaluating sepsis definitions., Design: Observational cohort., Setting: Multicenter quality improvement collaborative of 46 hospitals from January 2017 to December 2018, excluding neonatal ICUs., Patients: Improving Pediatric Sepsis Outcomes Sepsis was defined by electronic health record evidence of suspected infection and sepsis treatment or organ dysfunction. A more severely ill subgroup, Improving Pediatric Sepsis Outcomes Critical Sepsis, was defined, approximating septic shock., Interventions: Participating hospitals identified patients, extracted data, and transferred de-identified data to a central data warehouse. The definitions were evaluated across domains of reliability, content validity, construct validity, criterion validity, measurement burden, and timeliness., Measurements and Main Results: Forty hospitals met data quality criteria across four electronic health record platforms. There were 23,976 cases of Improving Pediatric Sepsis Outcomes Sepsis, including 8,565 with Improving Pediatric Sepsis Outcomes Critical Sepsis. The median age was 5.9 years. There were 10,316 (43.0%) immunosuppressed or immunocompromised patients, 4,135 (20.3%) with central lines, and 2,352 (11.6%) chronically ventilated. Among Improving Pediatric Sepsis Outcomes Sepsis patients, 60.8% were admitted to intensive care, 26.4% had new positive-pressure ventilation, and 19.7% received vasopressors. Median hospital length of stay was 6.0 days (3.0-13.0 d). All-cause 30-day in-hospital mortality was 958 (4.0%) in Improving Pediatric Sepsis Outcomes Sepsis; 541 (6.3%) in Improving Pediatric Sepsis Outcomes Critical Sepsis. The Improving Pediatric Sepsis Outcomes Sepsis definitions demonstrated strengths in content validity, convergent construct validity, and criterion validity; weakness in reliability. Improving Pediatric Sepsis Outcomes Sepsis definitions had significant initial measurement burden (median time from case completion to submission: 15 mo [interquartile range, 13-18 mo]); timeliness improved once data capture was established (median, 26 d; interquartile range, 23-56 d)., Conclusions: The Improving Pediatric Sepsis Outcomes Sepsis definitions demonstrated feasibility for large-scale data abstraction. The patients identified provide important information about children treated for sepsis. When operationalized, these definitions enabled multicenter identification and data aggregation, indicating practical utility for quality improvement.
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- 2020
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13. Antibiotic Timing in Pediatric Septic Shock.
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Lane RD, Olson J, Reeder R, Miller B, Workman JK, Thorell EA, and Larsen GY
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- Adolescent, Anti-Bacterial Agents therapeutic use, Benchmarking, Child, Child, Preschool, Emergency Service, Hospital, Female, Humans, Infant, Logistic Models, Male, Retrospective Studies, Shock, Septic mortality, Treatment Outcome, Anti-Bacterial Agents administration & dosage, Shock, Septic drug therapy, Time-to-Treatment
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Background and Objectives: National guidelines advocate for the administration of antibiotics within 1 hour to children with septic shock, although there is variance in the pediatric evidence-based literature supporting this benchmark. Our objective for this study was to describe the association of target time to antibiotic administration (TTAA) with outcomes of children treated for suspected septic shock in a pediatric emergency department. Septic shock is suspected when signs of perfusion and/or hypotension are present. The primary outcome was mortality. Secondary outcomes included PICU admission, hospital and PICU length of stay, and organ dysfunction resolution by hospital day 2., Methods: We conducted a retrospective study of children <18 years of age admitted from the pediatric emergency department and treated for suspected septic shock between February 1, 2007, and December 31, 2015. Associations between TTAA and outcomes were evaluated by using multivariable linear and logistic regression models obtained from stepwise selection., Results: Of 1377 patients, 47% were boys with a median age of 4.0 (interquartile range 1.4-11.6) years, 1.5% (20) died, 90% were compliant with TTAA goals, 40% required PICU admission, 38% had ≥2 unique complex chronic conditions, 71% received antibiotics in ≤2 hours, and 30% had a culture-positive bacterial etiology. There were no significant associations between TTAA and outcomes., Conclusions: We found no association with TTAA and any clinical outcomes, adding to the growing body of literature questioning the timing benchmark of antibiotic administration. Although the importance of antibiotics is not in question, elucidating the target TTAA may improve resource use and decrease inappropriate or unnecessary antibiotic exposure., Competing Interests: POTENTIAL CONFLICT OF INTEREST: The authors have indicated they have no potential conflicts of interest to disclose., (Copyright © 2020 by the American Academy of Pediatrics.)
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- 2020
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14. Severe Sepsis-Associated Morbidity and Mortality among Critically Ill Children with Cancer.
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Aljabari S, Balch A, Larsen GY, Fluchel M, and Workman JK
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Severe sepsis (SS) in pediatric oncology patients is a leading cause of morbidity and mortality. We investigated the incidence of and risk factors for morbidity and mortality among children diagnosed with cancer from 2008 to 2012, and admitted with SS during the 3 years following cancer diagnosis. A total of 1,002 children with cancer were included, 8% of whom required pediatric intensive care unit (PICU) admission with SS. Death and/or multiple organ dysfunction syndrome occurred in 34 out of 99 PICU encounters (34%). Lactate level and history of stem-cell transplantation were significantly associated with the development of death and/or organ dysfunction ( p < 0.05).
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- 2019
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15. Association Between Initial Emergency Department Lactate and Use of Vasoactive Medication in Children With Septic Shock.
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Miescier MJ, Lane RD, Sheng X, and Larsen GY
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- Adolescent, Child, Child, Preschool, Emergency Service, Hospital, Humans, Infant, Infant, Newborn, Logistic Models, Patient Admission, Reference Values, Retrospective Studies, Shock, Septic mortality, Shock, Septic therapy, Vital Signs, Lactic Acid blood, Shock, Septic blood, Vasoconstrictor Agents therapeutic use
- Abstract
Objectives: Current guidelines emphasize early recognition of pediatric septic shock using clinical examination findings. Elevated serum lactate has been associated with increased mortality in adult patients with septic shock. Our objective was to determine the association between the initial serum lactate obtained in the pediatric emergency department (PED) from patients treated for septic shock and the use of vasoactive medication within 24 hours., Methods: This was a retrospective study from 2008 through 2012 of PED patients at a tertiary care children's hospital. Patients younger than 18 years treated for septic shock were included if they had a serum lactate obtained in the PED., Results: Eight hundred sixty-four PED encounters met inclusion criteria. Median initial PED lactate was 2.1 mmol/L (interquartile range, 1.4-3.2 mmol/L). Overall, 121 patients (14%) received vasoactive medication within 24 hours of the initial PED lactate. A multivariable logistic regression analysis demonstrated associations between initial lactate levels of 3.1 to 5 mmol/L (odds ratio, 1.82; 95% confidence interval, 1.02-3.26) and 5.1 mmol/L or greater (odds ratio, 5.00; 95% confidence interval, 2.56-9.76) and the use of vasoactive medication within 24 hours. Other factors associated with use of vasoactive medication within 24 hours included hypotension, abnormal pulses, and mental status changes., Conclusions: Increased initial lactate is associated with use of vasoactive medication within 24 hours in PED patients with septic shock.
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- 2019
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16. Variability in antimicrobial use in pediatric ventilator-associated events.
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Karandikar MV, Coffin SE, Priebe GP, Sandora TJ, Logan LK, Larsen GY, Toltzis P, Gray JE, Klompas M, Sammons JS, Harper MB, Horan K, Lakoma M, Cocoros NM, and Lee GM
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- Adolescent, Antimicrobial Stewardship organization & administration, Child, Child, Preschool, Female, Hospital Mortality trends, Hospitals statistics & numerical data, Humans, Infant, Infant, Newborn, Male, Pneumonia, Ventilator-Associated drug therapy, Respiration, Artificial adverse effects, Retrospective Studies, United States epidemiology, Anti-Bacterial Agents therapeutic use, Intensive Care Units classification, Intensive Care Units statistics & numerical data, Pneumonia, Ventilator-Associated diagnosis
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Objective: To assess variability in antimicrobial use and associations with infection testing in pediatric ventilator-associated events (VAEs)., Design: Descriptive retrospective cohort with nested case-control study., Setting: Pediatric intensive care units (PICUs), cardiac intensive care units (CICUs), and neonatal intensive care units (NICUs) in 6 US hospitals.PatientsChildren≤18 years ventilated for≥1 calendar day., Methods: We identified patients with pediatric ventilator-associated conditions (VACs), pediatric VACs with antimicrobial use for≥4 days (AVACs), and possible ventilator-associated pneumonia (PVAP, defined as pediatric AVAC with a positive respiratory diagnostic test) according to previously proposed criteria., Results: Among 9,025 ventilated children, we identified 192 VAC cases, 43 in CICUs, 70 in PICUs, and 79 in NICUs. AVAC criteria were met in 79 VAC cases (41%) (58% CICU; 51% PICU; and 23% NICU), and varied by hospital (CICU, 20-67%; PICU, 0-70%; and NICU, 0-43%). Type and duration of AVAC antimicrobials varied by ICU type. AVAC cases in CICUs and PICUs received broad-spectrum antimicrobials more often than those in NICUs. Among AVAC cases, 39% had respiratory infection diagnostic testing performed; PVAP was identified in 15 VAC cases. Also, among AVAC cases, 73% had no associated positive respiratory or nonrespiratory diagnostic test., Conclusions: Antimicrobial use is common in pediatric VAC, with variability in spectrum and duration of antimicrobials within hospitals and across ICU types, while PVAP is uncommon. Prolonged antimicrobial use despite low rates of PVAP or positive laboratory testing for infection suggests that AVAC may provide a lever for antimicrobial stewardship programs to improve utilization.
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- 2019
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17. An Assessment of Asthma Therapy in the Pediatric ICU.
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Henderson MB, Schunk JE, Henderson JL, Larsen GY, Wilkes J, and Bratton SL
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- Adolescent, Asthma economics, Asthma epidemiology, Child, Child, Preschool, Cost-Benefit Analysis, Databases, Factual, Female, Humans, Intubation, Intratracheal economics, Male, Respiration, Artificial economics, Retrospective Studies, United States epidemiology, Asthma therapy, Intensive Care Units, Pediatric economics, Length of Stay statistics & numerical data
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Objectives: To describe asthma management, investigate practice variation, and describe asthma-associated charges and resource use during asthma management in the PICU., Methods: Children ages 2 to 18 years treated for status asthmaticus in the PICU from 2008 to 2011 are included in this study. This is a retrospective, single-center, cohort study. Data were collected by using the Intermountain Healthcare Enterprise Data Warehouse., Results: There were 262 patients included and grouped by maximal respiratory support intervention. Seventy percent of the patients did not receive escalation of respiratory support beyond nasal cannula or nonrebreather mask, and the majority of these patients received only first-tier recommended therapy. For all patients, medical imaging and laboratory charge fractions accounted for <3% and <5% of the total charges, respectively. Among nonintubated patients, the majority of these diagnostic test results were normal. Fifteen patients were intubated during our study period; 4 were intubated at our facility. Compared with outside hospital intubations, these 4 patients had longer time to intubation (>3 days versus <24 hours) and significantly longer median PICU length of stay (12.7 days versus 2.6 days)., Conclusions: In our study, the vast majority of patients with severe asthma were treated with minimal interventions alone (nasal cannula or nonrebreather mask and first-tier medications). Minimizing PICU length of stay is likely the most successful way to decrease expense during asthma care., Competing Interests: POTENTIAL CONFLICT OF INTEREST: The authors have indicated they have no potential conflicts of interest to disclose., (Copyright © 2018 by the American Academy of Pediatrics.)
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- 2018
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18. The Most Vulnerable SPROUTs: Severe Sepsis in the Pediatric Hematopoietic Cell Transplantation Population.
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Workman JK and Larsen GY
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- Child, Cross-Sectional Studies, Humans, Morbidity, Prevalence, Hematopoietic Stem Cell Transplantation, Sepsis
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- 2017
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19. Factors Associated With Pediatric Ventilator-Associated Conditions in Six U.S. Hospitals: A Nested Case-Control Study.
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Cocoros NM, Priebe G, Gray JE, Toltzis P, Larsen GY, Logan LK, Coffin S, Sammons JS, Deakins K, Horan K, Lakoma M, Young J, Burton M, Klompas M, and Lee GM
- Subjects
- Adolescent, Case-Control Studies, Child, Child, Preschool, Female, Hospitals, Humans, Infant, Infant, Newborn, Intensive Care Units, Pediatric, Logistic Models, Male, Odds Ratio, Retrospective Studies, Risk Factors, United States, Respiration, Artificial adverse effects
- Abstract
Objectives: A newly proposed surveillance definition for ventilator-associated conditions among neonatal and pediatric patients has been associated with increased morbidity and mortality among ventilated patients in cardiac ICU, neonatal ICU, and PICU. This study aimed to identify potential risk factors associated with pediatric ventilator-associated conditions., Design: Retrospective cohort., Setting: Six U.S. hospitals PATIENTS:: Children less than or equal to 18 years old ventilated for greater than or equal to 1 day., Interventions: None., Measurements and Main Results: We identified children with pediatric ventilator-associated conditions and matched them to children without ventilator-associated conditions. Medical records were reviewed for comorbidities and acute care factors. We used bivariate and multivariate conditional logistic regression models to identify factors associated with ventilator-associated conditions. We studied 192 pairs of ventilator-associated conditions cases and matched controls (113 in the PICU and cardiac ICU combined; 79 in the neonatal ICU). In the PICU/cardiac ICU, potential risk factors for ventilator-associated conditions included neuromuscular blockade (odds ratio, 2.29; 95% CI, 1.08-4.87), positive fluid balance (highest quartile compared with the lowest, odds ratio, 7.76; 95% CI, 2.10-28.6), and blood product use (odds ratio, 1.52; 95% CI, 0.70-3.28). Weaning from sedation (i.e., decreasing sedation) or interruption of sedation may be protective (odds ratio, 0.44; 95% CI, 0.18-1.11). In the neonatal ICU, potential risk factors included blood product use (odds ratio, 2.99; 95% CI, 1.02-8.78), neuromuscular blockade use (odds ratio, 3.96; 95% CI, 0.93-16.9), and recent surgical procedures (odds ratio, 2.19; 95% CI, 0.77-6.28). Weaning or interrupting sedation was protective (odds ratio, 0.07; 95% CI, 0.01-0.79)., Conclusions: In mechanically ventilated neonates and children, we identified several possible risk factors associated with ventilator-associated conditions. Next steps include studying propensity-matched cohorts and prospectively testing whether changes in sedation management, transfusion thresholds, and fluid management can decrease pediatric ventilator-associated conditions rates and improve patient outcomes.
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- 2017
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20. Infectious Etiologies and Patient Outcomes in Pediatric Septic Shock.
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Ames SG, Workman JK, Olson JA, Korgenski EK, Masotti S, Knackstedt ED, Bratton SL, and Larsen GY
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- Adolescent, Bacterial Infections mortality, Child, Child, Preschool, Cohort Studies, Early Medical Intervention, Emergency Service, Hospital, Female, Humans, Infant, Male, Retrospective Studies, Shock, Septic mortality, Survival Analysis, Anti-Bacterial Agents therapeutic use, Bacterial Infections drug therapy, Shock, Septic drug therapy
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Background: Septic shock remains an important cause of death and disability in children. Optimal care requires early recognition and treatment., Methods: We evaluated a retrospective cohort of children (age <19) treated in our emergency department (ED) for septic shock during 2008-2012 to investigate the association between timing of antibiotic therapy and outcomes. The exposures were (1) receipt of empiric antibiotics in ≤1 hour and (2) receipt of appropriate antibiotics in ≤1 hour. The primary outcome was development of new or progressive multiple system organ dysfunction syndrome (NP-MODS). The secondary outcome was mortality., Results: Among 321 patients admitted to intensive care, 48% (n = 153) received empiric antibiotics in ≤1 hour. These patients were more ill at presentation with significantly greater median pediatric index of mortality 2 (PIM2) scores and were more likely to receive recommended resuscitation in the ED (61% vs 14%); however, rates of NP-MODS (9% vs 12%) and hospital mortality (7% vs 4%) were similar to those treated later. Early, appropriate antibiotics were administered to 33% (n = 67) of patients with identified or suspected bacterial infection. These patients had significantly greater PIM2 scores but similar rates of NP-MODS (15% vs 15%) and hospital mortality (10% vs 6%) to those treated later., Conclusions: Critically ill children with septic shock treated in a children's hospital ED who received antibiotics in ≤1 hour were significantly more severely ill than those treated later, but they did not have increased risk of NP-MODS or death., (© The Author 2016. Published by Oxford University Press on behalf of The Journal of the Pediatric Infectious Diseases Society. All rights reserved. For permissions, please e-mail: journals.permissions@oup.com.)
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- 2017
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21. A Pediatric Intensive Care Unit Bedside Computer Clinical Decision Support Protocol for Hyperglycemia Is Feasible, Safe and Offers Advantages.
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Hirshberg EL, Lanspa MJ, Wilson EL, Sward KA, Jephson A, Larsen GY, and Morris AH
- Subjects
- Adolescent, Child, Child, Preschool, Female, Humans, Hyperglycemia blood, Hypoglycemic Agents administration & dosage, Infant, Insulin administration & dosage, Male, Blood Glucose analysis, Decision Support Systems, Clinical, Hyperglycemia drug therapy, Hypoglycemic Agents therapeutic use, Insulin therapeutic use, Intensive Care Units, Pediatric, Point-of-Care Systems
- Abstract
Background: Computer clinical decision support (CDS) systems are uncommon in the pediatric intensive care unit (PICU), despite evidence suggesting they improve outcomes in adult ICUs. We reasoned that a bedside CDS protocol for intravenous insulin titration, eProtocol-insulin, would be feasible and safe in critically ill children., Methods: We retrospectively reviewed data from non-diabetic children admitted to the PICU with blood glucose (BG) ≥140 mg/dL who were managed with intravenous insulin by either unaided clinician titration or eProtocol-insulin. Primary outcomes were BG measurements in target range (80-110 mg/dL) and severe hypoglycemia (BG ≤40 mg/dL); secondary outcomes were 60-day mortality and PICU length of stay. We assessed bedside nurse satisfaction with the eProtocol-insulin protocol by using a 5-point Likert scale and measured clinician compliance with eProtocol-insulin recommendations., Results: Over 5 years, 69 children were titrated with eProtocol-insulin versus 104 by unaided clinicians. eProtocol-insulin achieved target range more frequently than clinician titration (41% vs. 32%, P < 0.001). Severe hypoglycemia was uncommon in both groups (4.3% of patients in eProtocol-insulin, 8.7% in clinician titration, P = 0.37). There were no differences in mean time to BG target or median BG between the groups. Mortality was 23% in both groups. Clinician compliance with eProtocol-insulin recommendations was 89%. Nurses believed that eProtocol-insulin was easy to understand and safer than clinician titration., Conclusions: eProtocol-insulin is safe for titration of intravenous insulin in critically ill children. Clinical research protocols and quality improvement initiatives aimed at optimizing BG control should utilize detailed computer protocols that enable replicable clinician decisions.
- Published
- 2017
- Full Text
- View/download PDF
22. Searching for a Pediatric Severe Sepsis Phenotype: Are We There Yet?
- Author
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Workman JK and Larsen GY
- Subjects
- Child, Humans, Infant, Phenotype, Intensive Care Units, Pediatric, Sepsis
- Published
- 2017
- Full Text
- View/download PDF
23. High Reliability Pediatric Septic Shock Quality Improvement Initiative and Decreasing Mortality.
- Author
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Lane RD, Funai T, Reeder R, and Larsen GY
- Subjects
- Anti-Bacterial Agents therapeutic use, Child, Child, Preschool, Emergency Service, Hospital, Female, Fluid Therapy methods, Humans, Infant, Longitudinal Studies, Male, Pediatrics, Program Evaluation, Reproducibility of Results, Shock, Septic mortality, Shock, Septic therapy, Triage, Guideline Adherence statistics & numerical data, Hospital Mortality, Quality Improvement, Shock, Septic diagnosis
- Abstract
Background and Objective: Septic shock impacts mortality, morbidity, and health care costs. A quality improvement (QI) initiative was launched to improve early recognition and timely treatment of patients with septic shock in a pediatric emergency department (PED). Our primary aim was to describe the longitudinal effectiveness of the program, iterative changes in clinical practice, and associated outcomes., Methods: We implemented multiple interventions during our QI initiative (February 2007 to December 2014). Analysis of compliance and outcomes focused on a bundle consisting of: (1) timely antibiotics, (2) intravenous fluids (IVF) for rapid reversal of perfusion abnormalities and/or hypotension. Logistic regression was used to obtain adjusted odds ratios (ORs) for death and pediatric ICU (PICU) admission., Results: A total of 1380 patients were treated for septic shock; 93% met screening criteria at triage. Implementation of the various processes improved timely interventions. One example included implementation of a sepsis order set, after which the mean proportion of patients receiving timely antibiotics increased to its highest rate. The odds of death were 5 times as high for children who did not receive bundle-compliant care (OR, 5.0 [95% Confidence Interval 1.9, 14.3]) compared with those who did (OR, 0.20 [95% Confidence Interval 0.07, 0.53]). Among PICU admitted patients, the odds of mortality were greater for children who presented with abnormal mental status and a higher pediatric index of mortality 2 score., Conclusions: QI methodology improved septic shock program goal adherence and decreased mortality without increasing PICU admissions or PED length of stay over the 8-year period, supporting continued emphasis on early recognition, timely IVF resuscitation, and antibiotic administration., (Copyright © 2016 by the American Academy of Pediatrics.)
- Published
- 2016
- Full Text
- View/download PDF
24. Treatment of Pediatric Septic Shock With the Surviving Sepsis Campaign Guidelines and PICU Patient Outcomes.
- Author
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Workman JK, Ames SG, Reeder RW, Korgenski EK, Masotti SM, Bratton SL, and Larsen GY
- Subjects
- Adolescent, Child, Child, Preschool, Combined Modality Therapy, Critical Care standards, Critical Care statistics & numerical data, Emergency Service, Hospital, Female, Hospitals, Pediatric, Humans, Infant, Infant, Newborn, Intensive Care Units, Pediatric, Logistic Models, Male, Multiple Organ Failure etiology, Multiple Organ Failure mortality, Multiple Organ Failure prevention & control, Practice Guidelines as Topic, Retrospective Studies, Shock, Septic complications, Shock, Septic diagnosis, Shock, Septic mortality, Time Factors, Treatment Outcome, Critical Care methods, Guideline Adherence statistics & numerical data, Practice Patterns, Physicians' statistics & numerical data, Shock, Septic therapy
- Abstract
Objectives: The Surviving Sepsis Campaign recommends rapid recognition and treatment of severe sepsis and septic shock. Few reports have evaluated the impact of these recommendations in pediatrics. We sought to determine if outcomes in patients who received initial care compliant with the Surviving Sepsis Campaign time goals differed from those treated more slowly., Design: Single center retrospective cohort study., Setting: Emergency department and PICU at an academic children's hospital., Patients: Three hundred twenty-one patients treated for septic shock in the emergency department and admitted directly to the PICU., Interventions: None., Measurements and Main Results: The exposure was receipt of emergency department care compliant with the Surviving Sepsis Campaign recommendations (delivery of IV fluids, IV antibiotics, and vasoactive infusions within 1 hr of shock recognition). The primary outcome was development of new or progressive multiple organ dysfunction syndrome. Secondary outcomes included mortality, need for mechanical ventilation or vasoactive medications, and hospital and PICU length of stay. Of the 321 children studied, 117 received Surviving Sepsis Campaign compliant care in the emergency department and 204 did not. New or progressive multiple organ dysfunction syndrome developed in nine of the patients (7.7%) who received Surviving Sepsis Campaign compliant care and 25 (12.3%) who did not (p = 0.26). There were 17 deaths; overall mortality rate was 5%. There were no significant differences between groups in any of the secondary outcomes. Although only 36% of patients met the Surviving Sepsis Campaign guideline recommendation of bundled care within 1 hour of shock recognition, 75% of patients received the recommended interventions in less than 3 hours., Conclusions: Treatment for pediatric septic shock in compliance with the Surviving Sepsis Campaign recommendations was not associated with better outcomes compared with children whose initial therapies in the emergency department were administered more slowly. However, all patients were treated rapidly and we report low morbidity and mortality. This underscores the importance of rapid recognition and treatment of septic shock.
- Published
- 2016
- Full Text
- View/download PDF
25. Structure, Process, and Culture Differences of Pediatric Trauma Centers Participating in an International Comparative Effectiveness Study of Children with Severe Traumatic Brain Injury.
- Author
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Larsen GY, Schober M, Fabio A, Wisniewski SR, Grant MJ, Shafi N, Bennett TD, Hirtz D, and Bell MJ
- Subjects
- Child, Cohort Studies, Humans, Brain Injuries, Traumatic therapy, Comparative Effectiveness Research statistics & numerical data, Intensive Care Units, Pediatric statistics & numerical data, Medical Staff, Hospital statistics & numerical data, Organizational Culture, Patient Safety statistics & numerical data, Quality of Health Care statistics & numerical data, Trauma Centers statistics & numerical data
- Abstract
Background: Traumatic brain injury (TBI) is an important worldwide cause of death and disability for children. The Approaches and Decisions for Acute Pediatric TBI (ADAPT) Trial is an observational, cohort study to compare the effectiveness of six aspects of TBI care. Understanding the differences between clinical sites-including their structure, clinical processes, and culture differences-will be necessary to assess differences in outcome from the study and can inform the overall community regarding differences across academic centers., Methods: We developed a survey and queried ADAPT site principal investigators with a focus on six domains: (i) hospital, (ii) pediatric intensive care unit (PICU), (iii) medical staff characteristics, (iv) quality of care, (v) medication safety, and (vi) safety culture. Summary statistics were used to describe differences between centers., Results: ADAPT clinical sites that enrolled a subject within the first year (32 US-based, 11 international) were studied. A wide variation in site characteristics was observed in hospital and ICU characteristics, including an almost sevenfold range in ICU size (8-55 beds) and more than fivefold range of overall ICU admissions (537-2623). Nursing staffing (predominantly 1:1 or 1:2) and the presence of pharmacists within the ICU (79 %) were less variable, and most sites "strongly agreed" or "agreed" that Neurosurgery and Critical Care teams worked well together (81.4 %). However, a minority of sites (46 %) used an explicit protocol for treatment of children with severe TBI care., Conclusions: We found a variety of inter-center structure, process, and culture differences. These intrinsic differences between sites may begin to explain why interventional studies have failed to prove efficacy of experimental therapies. Understanding these differences may be an important factor in analyzing future ADAPT trial results and in determining best practices for pediatric severe TBI.
- Published
- 2016
- Full Text
- View/download PDF
26. Pediatric and neonatal extracorporeal membrane oxygenation: does center volume impact mortality?*.
- Author
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Freeman CL, Bennett TD, Casper TC, Larsen GY, Hubbard A, Wilkes J, and Bratton SL
- Subjects
- Adolescent, Age Factors, Cardiopulmonary Resuscitation mortality, Child, Child, Preschool, Critical Illness mortality, Critical Illness therapy, Databases, Factual, Extracorporeal Membrane Oxygenation methods, Female, Hospitals, Low-Volume, Hospitals, Pediatric, Humans, Infant, Infant, Newborn, Likelihood Functions, Male, Odds Ratio, Retrospective Studies, Risk Adjustment, Sex Factors, Survival Analysis, Cardiopulmonary Resuscitation methods, Extracorporeal Membrane Oxygenation mortality, Heart Failure mortality, Heart Failure therapy, Hospital Mortality trends, Hospitals, High-Volume
- Abstract
Objective: Extracorporeal membrane oxygenation, an accepted rescue therapy for refractory cardiopulmonary failure, requires a complex multidisciplinary approach and advanced technology. Little is known about the relationship between a center's case volume and patient mortality. The purpose of this study was to analyze the relationship between hospital extracorporeal membrane oxygenation annual volume and in-hospital mortality and assess if a minimum hospital volume could be recommended., Design: Retrospective cohort study., Setting: A retrospective cohort admitted to children's hospitals in the Pediatric Health Information System database from 2004 to 2011 supported with extracorporeal membrane oxygenation was identified. Indications were assigned based on patient age (neonatal vs pediatric), diagnosis, and procedure codes. Average hospital annual volume was defined as 0-19, 20-49, or greater than or equal to 50 cases per year. Maximum likelihood estimates were used to assess minimum annual case volume., Patients: A total of 7,322 pediatric patients aged 0-18 were supported with extracorporeal membrane oxygenation and had an indication assigned., Interventions: None., Measurements and Main Results: Average hospital extracorporeal membrane oxygenation volume ranged from 1 to 58 cases per year. Overall mortality was 43% but differed significantly by indication. After adjustment for case-mix, complexity of cardiac surgery, and year of treatment, patients treated at medium-volume centers (odds ratio, 0.86; 95% CI, 0.75-0.98) and high-volume centers (odds ratio, 0.75; 95% CI, 0.63-0.89) had significantly lower odds of death compared with those treated at low-volume centers. The minimum annual case load most significantly associated with lower mortality was 22 (95% CI, 22-28)., Conclusions: Pediatric centers with low extracorporeal membrane oxygenation average annual case volume had significantly higher mortality and a minimum volume of 22 cases per year was associated with improved mortality. We suggest that this threshold should be evaluated by additional study.
- Published
- 2014
- Full Text
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27. An emergency department septic shock protocol and care guideline for children initiated at triage.
- Author
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Larsen GY, Mecham N, and Greenberg R
- Subjects
- Child, Preschool, Female, Hospital Mortality, Humans, Male, Retrospective Studies, Shock, Septic diagnosis, Treatment Outcome, Clinical Protocols standards, Emergencies, Emergency Service, Hospital organization & administration, Guideline Adherence organization & administration, Shock, Septic therapy, Triage standards
- Abstract
Background: Unrecognized and undertreated septic shock increases morbidity and mortality. Septic shock in children is defined as sepsis and cardiovascular organ dysfunction, not necessarily with hypotension., Objective: Cases of unrecognized and undertreated septic shock in our emergency department (ED) were reviewed with a focus on (1) increased recognition at triage and (2) more aggressive treatment once recognized. We hypothesized that septic shock protocol and care guideline would expedite identification of septic shock, increase compliance with recommended therapy, and improve outcomes., Methods: We developed an ED septic shock protocol and care guideline to improve recognition beginning at triage and evaluated all eligible ED patients from January 2005 to December 2009., Results: We identified 345 pediatric ED patients (49% male, median age: 5.6 years), and 297 (86.1%) met septic shock criteria at triage. One hundred ninety-six (56.8%) had ≥ 1 chronic complex condition. Hypotension was present in 34% (n = 120); the most common findings were tachycardia (n = 251 [73%]) and skin-color changes (n = 269 [78%]). The median hospital length of stay declined over the study period (median: 181-140 hours; P < .05); there was no change in mortality rate, which averaged 6.3% (22 of 345). The greatest gains in care included more complete recording of triage vital signs, timely fluid resuscitation and antibiotic administration, and serum lactate determination., Conclusions: Implementation of an ED septic shock protocol and care guideline improved compliance in delivery of rapid, aggressive fluid resuscitation and early antibiotic and oxygen administration and was associated with decreased length of stay.
- Published
- 2011
- Full Text
- View/download PDF
28. Classifying undetermined poisoning deaths.
- Author
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Donaldson AE, Larsen GY, Fullerton-Gleason L, and Olson LM
- Subjects
- Adult, Alcohol Drinking epidemiology, Chi-Square Distribution, Female, Humans, Male, Mental Health, Poisoning mortality, Regression Analysis, Self-Injurious Behavior mortality, Substance-Related Disorders epidemiology, Utah epidemiology, Poisoning classification, Self-Injurious Behavior classification
- Abstract
Objective: To classify poisoning deaths of undetermined intent as either suicide or unintentional and to estimate the extent of underreported poisoning suicides., Methods: Based on 2002 statewide death certificate and medical examiner data in Utah, the authors randomly selected one half of undetermined and unintentional poisoning deaths for data abstraction and included all suicides. Bivariate analyses assessed differences in demographics, death characteristics, forensic toxicology results, mental health history, and other potentially contributing factors. Classification and regression tree (CART) analysis used information from unintentional and suicide poisoning deaths to create a classification tree that was applied to undetermined poisoning deaths., Results: The authors analyzed 41 unintentional, 87 suicide, and 84 undetermined poisonings. Undetermined and unintentional decedents were similar in the presence of opiates, physical health problems, and drug abuse. Although none of the undetermined decedents left a suicide note, previous attempt or intent to commit suicide was reported for 11 (13%) of these cases. CART analysis identified suicidal behavior, drug abuse, physical health problems, depressed mood, and age as discriminating between suicide and unintentional poisoning. It is estimated that suicide rates related to poisoning are underreported by approximately 30% and overall suicide rates by 10%. Unintentional poisoning death rates were underreported by 61%., Conclusions: This study suggests that manner of death determination relies on circumstance dependent variables that may not be consistently captured by medical examiners. Underreporting of suicide rates has important implications in policy development, research funding, and evaluation of prevention programs.
- Published
- 2006
- Full Text
- View/download PDF
29. The safety culture in a children's hospital.
- Author
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Grant MJ, Donaldson AE, and Larsen GY
- Subjects
- Adult, Burnout, Professional prevention & control, Burnout, Professional psychology, Communication, Cooperative Behavior, Fatigue prevention & control, Fatigue psychology, Female, Health Services Needs and Demand, Hospitals, University, Humans, Interprofessional Relations, Job Satisfaction, Male, Nursing Methodology Research, Organizational Culture, Organizational Innovation, Social Support, Surveys and Questionnaires, Total Quality Management organization & administration, Utah, Attitude of Health Personnel, Hospitals, Pediatric organization & administration, Medical Errors prevention & control, Medical Staff, Hospital psychology, Nursing Staff, Hospital psychology, Safety Management organization & administration
- Abstract
Efforts to improve patient safety require an understanding of organizational culture. In a survey of inpatient healthcare providers in a children's hospital, physician perceptions of teamwork were higher than those of all other staff (P < .001). Recognition of the impact of stress and fatigue was low, and job satisfaction was high for all groups. A majority of respondents did not feel rewarded for incident reporting. Information on hospital-level safety culture can lead to targeted system improvement.
- Published
- 2006
- Full Text
- View/download PDF
30. Consultation with the specialist: increased intracranial pressure.
- Author
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Larsen GY and Goldstein B
- Subjects
- Child, Child, Preschool, Diuretics, Osmotic therapeutic use, Glasgow Coma Scale, Humans, Infant, Intracranial Hypertension etiology, Intracranial Hypertension physiopathology, Magnetic Resonance Imaging, Mannitol therapeutic use, Respiration, Artificial, Spinal Puncture, Tomography, X-Ray Computed, Intracranial Hypertension diagnosis, Intracranial Hypertension therapy
- Published
- 1999
- Full Text
- View/download PDF
31. Marked phenotypic variability in Pseudomonas cepacia isolated from a patient with cystic fibrosis.
- Author
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Larsen GY, Stull TL, and Burns JL
- Subjects
- Adolescent, Bacterial Outer Membrane Proteins analysis, Burkholderia cepacia classification, Burkholderia cepacia drug effects, Burkholderia cepacia genetics, Female, Humans, Microbial Sensitivity Tests, Phenotype, Plasmids, Polymerase Chain Reaction, Burkholderia cepacia isolation & purification, Cystic Fibrosis microbiology
- Abstract
Characterization of the epidemiology of Pseudomonas cepacia colonization in cystic fibrosis is difficult because of the phenotypic variability of isolates. A single sputum culture may yield colonies which differ in morphology, antibiotic susceptibility, and pigment production. We examined serial P. cepacia isolates from a cystic fibrosis patient which the clinical laboratory identified as separate strains; these were selected on the basis of isolation date and culture site. An attempt was made to sample at multiple time points and, at a single time point, from three different culture sites. Ribotype analysis, using both the standard Southern blot technique and a recently reported method which uses the polymerase chain reaction, was used to distinguish unique P. cepacia strains. Characterization included comparison of antibiotic susceptibility, plasmid content, and outer membrane protein (OMP) patterns. rRNA analysis demonstrated that all isolates had the same ribotype, consistent with their being derivatives of the same strain. Antibiotic susceptibility testing revealed variability among both same-date and same-site isolates. Screening for plasmid DNA identified three groups of isolates; both same-date and same-site isolates demonstrated variability. OMP profiles were similar, but at least six distinct patterns were identified. For the six same-date isolates, five different OMP patterns were identified. For the 10 same-site isolates from different dates, five of the six OMP patterns were represented. We have demonstrated marked phenotypic variability in 14 strains of P. cepacia isolated from different sites and at different times from a single colonized patient. Ribotyping identified all the isolates as derivatives of a single strain; thus, the diversity of phenotypes appears to be the result of differential gene expression.
- Published
- 1993
- Full Text
- View/download PDF
32. Verbal factors in compensation performance and the relation between conservation and compensation.
- Author
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Larsen GY and Flavell JH
- Subjects
- Analysis of Variance, Child, Child, Preschool, Cues, Depth Perception, Humans, Perceptual Distortion, Size Perception, Child Development, Concept Formation, Verbal Behavior, Visual Perception
- Published
- 1970
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