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Bentley S, Hu K, Messman A, Moadel T, Khandelwal S, Streich H, Noelker J. Are All Competencies Equal in the Eyes of Residents? A Multicenter Study of Emergency Medicine Residents' Interest in Feedback. West J Emerg Med 2016; 18:76-81. [PMID: 28116012 PMCID: PMC5226767 DOI: 10.5811/westjem.2016.11.32626] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2016] [Accepted: 11/30/2016] [Indexed: 11/11/2022] Open
Abstract
Introduction Feedback, particularly real-time feedback, is critical to resident education. The emergency medicine (EM) milestones were developed in 2012 to enhance resident assessment, and many programs use them to provide focused resident feedback. The purpose of this study was to evaluate EM residents’ level of interest in receiving real-time feedback on each of the 23 competencies/sub-competencies. Methods This was a multicenter cross-sectional study of EM residents. We surveyed participants on their level of interest in receiving real-time on-shift feedback on each of the 23 competencies/sub-competencies. Anonymous paper or computerized surveys were distributed to residents at three four-year training programs and three three-year training programs with a total of 223 resident respondents. Residents rated their level of interest in each milestone on a six-point Likert-type response scale. We calculated average level of interest for each of the 23 sub-competencies, for all 223 respondents and separately by postgraduate year (PGY) levels of training. One-way analyses of variance were performed to determine if there were differences in ratings by level of training. Results The overall survey response rate across all institutions was 82%. Emergency stabilization had the highest mean rating (5.47/6), while technology had the lowest rating (3.24/6). However, we observed no differences between levels of training on any of the 23 competencies/sub-competencies. Conclusion Residents seem to ascribe much more value in receiving feedback on domains involving high-risk, challenging procedural skills as compared to low-risk technical and communication skills. Further studies are necessary to determine whether residents’ perceived importance of competencies/sub-competencies needs to be considered when developing an assessment or feedback program based on these 23 EM competencies/sub-competencies.
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Nadir NA, Bentley S, Papanagnou D, Bajaj K, Rinnert S, Sinert R. Characteristics of Real-Time, Non-Critical Incident Debriefing Practices in the Emergency Department. West J Emerg Med 2016; 18:146-151. [PMID: 28116028 PMCID: PMC5226751 DOI: 10.5811/westjem.2016.10.31467] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2016] [Revised: 10/03/2016] [Accepted: 10/27/2016] [Indexed: 11/11/2022] Open
Abstract
INTRODUCTION Benefits of post-simulation debriefings as an educational and feedback tool have been widely accepted for nearly a decade. Real-time, non-critical incident debriefing is similar to post-simulation debriefing; however, data on its practice in academic emergency departments (ED), is limited. Although tools such as TeamSTEPPS® (Team Strategies and Tools to Enhance Performance and Patient Safety) suggest debriefing after complicated medical situations, they do not teach debriefing skills suited to this purpose. Anecdotal evidence suggests that real-time debriefings (or non-critical incident debriefings) do in fact occur in academic EDs;, however, limited research has been performed on this subject. The objective of this study was to characterize real-time, non-critical incident debriefing practices in emergency medicine (EM). METHODS We conducted this multicenter cross-sectional study of EM attendings and residents at four large, high-volume, academic EM residency programs in New York City. Questionnaire design was based on a Delphi panel and pilot testing with expert panel. We sought a convenience sample from a potential pool of approximately 300 physicians across the four sites with the goal of obtaining >100 responses. The survey was sent electronically to the four residency list-serves with a total of six monthly completion reminder emails. We collected all data electronically and anonymously using SurveyMonkey.com; the data were then entered into and analyzed with Microsoft Excel. RESULTS The data elucidate various characteristics of current real-time debriefing trends in EM, including its definition, perceived benefits and barriers, as well as the variety of formats of debriefings currently being conducted. CONCLUSION This survey regarding the practice of real-time, non-critical incident debriefings in four major academic EM programs within New York City sheds light on three major, pertinent points: 1) real-time, non-critical incident debriefing definitely occurs in academic emergency practice; 2) in general, real-time debriefing is perceived to be of some value with respect to education, systems and performance improvement; 3) although it is practiced by clinicians, most report no formal training in actual debriefing techniques. Further study is needed to clarify actual benefits of real-time/non-critical incident debriefing as well as details on potential pitfalls of this practice and recommendations for best practices for use.
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Kairus R, Santos C, Kazzi Z, Bentley S, Olmedo R. Development of a medical Toxicology Curriculum in Spanish with content informed by a population survey for medical trainees in the Dominican Republic. Toxicol Lett 2016. [DOI: 10.1016/j.toxlet.2016.07.271] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Frallicciardi A, Vora S, Bentley S, Nadir NA, Cassara M, Hart D, Park C, Cheng A, Aghera A, Moadel T, Dobiesz V. Development of an Emergency Medicine Simulation Fellowship Consensus Curriculum: Initiative of the Society for Academic Emergency Medicine Simulation Academy. Acad Emerg Med 2016; 23:1054-60. [PMID: 27251553 DOI: 10.1111/acem.13019] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2016] [Revised: 05/19/2016] [Accepted: 05/23/2016] [Indexed: 11/26/2022]
Abstract
OBJECTIVES There is currently no consolidated list of existing simulation fellowship programs in emergency medicine (EM). In addition, there are no universally accepted or expected standards for core curricular content. The objective of this project is to develop consensus-based core content for EM simulation fellowships to help frame the critical components of such training programs. METHODS This paper delineates the process used to develop consensus curriculum content for EM simulation fellowships. EM simulation fellowship curricula were collected. Curricular content was reviewed and compiled by simulation experts and validated utilizing survey methodology, and consensus was obtained using a modified Delphi methodology. RESULTS Fifteen EM simulation fellowship curricula were obtained and analyzed. Two rounds of a modified Delphi survey were conducted. The final proposed core curriculum content contains 47 elements in nine domains with 14 optional elements. CONCLUSION The proposed consensus content will provide current and future fellowships a foundation on which to build their own specific and detailed fellowship curricula. Such standardization will ultimately increase the transparency of training programs for future trainees and potential employers.
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Dandekar A, Gomez W, Rodriguez J, Bentley S. Preconception risk factors and attitudes about reproductive planning in
women of reproductive age in the Dominican Republic. Ann Glob Health 2016. [DOI: 10.1016/j.aogh.2016.04.621] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022] Open
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Arias MC, Lockwood A, Ali M, Veras K, Olivares J, Bentley S, Dandekar A. Effects of a hospital-based pilot education program on breastfeeding
knowledge in Santiago, Dominican Republic. Ann Glob Health 2016. [DOI: 10.1016/j.aogh.2016.04.615] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
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Lockwood A, Arias M, Ovalles M, Dandekar A, Bentley S. Factors associated with pediatric emergency room utilization in an Urban
community hospital in Santiago, Dominican Republic. Ann Glob Health 2016. [DOI: 10.1016/j.aogh.2016.04.446] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022] Open
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Bentley S, Mudan G, Strother C, Wong N. Are Live Ultrasound Models Replaceable? Traditional versus Simulated Education Module for FAST Exam. West J Emerg Med 2015; 16:818-22. [PMID: 26594272 PMCID: PMC4651576 DOI: 10.5811/westjem.2015.9.27276] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2015] [Revised: 08/31/2015] [Accepted: 09/26/2015] [Indexed: 11/28/2022] Open
Abstract
Introduction The focused assessment with sonography for trauma (FAST) is a commonly used and life-saving tool in the initial assessment of trauma patients. The recommended emergency medicine (EM) curriculum includes ultrasound and studies show the additional utility of ultrasound training for medical students. EM clerkships vary and often do not contain formal ultrasound instruction. Time constraints for facilitating lectures and hands-on learning of ultrasound are challenging. Limitations on didactics call for development and inclusion of novel educational strategies, such as simulation. The objective of this study was to compare the test, survey, and performance of ultrasound between medical students trained on an ultrasound simulator versus those trained via traditional, hands-on patient format. Methods This was a prospective, blinded, controlled educational study focused on EM clerkship medical students. After all received a standardized lecture with pictorial demonstration of image acquisition, students were randomized into two groups: control group receiving traditional training method via practice on a human model and intervention group training via practice on an ultrasound simulator. Participants were tested and surveyed on indications and interpretation of FAST and training and confidence with image interpretation and acquisition before and after this educational activity. Evaluation of FAST skills was performed on a human model to emulate patient care and practical skills were scored via objective structured clinical examination (OSCE) with critical action checklist. Results There was no significant difference between control group (N=54) and intervention group (N=39) on pretest scores, prior ultrasound training/education, or ultrasound comfort level in general or on FAST. All students (N=93) showed significant improvement from pre- to post-test scores and significant improvement in comfort level using ultrasound in general and on FAST (p<0.001). There was no significant difference between groups on OSCE scores of FAST on a live model. Overall, no differences were demonstrated between groups trained on human models versus simulator. Discussion There was no difference between groups in knowledge based ultrasound test scores, survey of comfort levels with ultrasound, and students’ abilities to perform and interpret FAST on human models. Conclusion These findings suggest that an ultrasound simulator is a suitable alternative method for ultrasound education. Additional uses of ultrasound simulation should be explored in the future.
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Leader A, Desai N, Torres S, Murphy R, Bentley S. 215 Implementation of a Pediatric Emergency Medicine Protocol and Curriculum in the Dominican Republic. Ann Emerg Med 2015. [DOI: 10.1016/j.annemergmed.2015.07.248] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Bentley S, Hexom B, Nelson BP. Evaluation of an Obstetric Ultrasound Curriculum for Midwives in Liberia. JOURNAL OF ULTRASOUND IN MEDICINE : OFFICIAL JOURNAL OF THE AMERICAN INSTITUTE OF ULTRASOUND IN MEDICINE 2015; 34:1563-1568. [PMID: 26254155 DOI: 10.7863/ultra.15.14.08017] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/07/2014] [Accepted: 11/29/2014] [Indexed: 06/04/2023]
Abstract
OBJECTIVES Point-of-care ultrasound is an effective tool for clinical decision making in low- and middle-income countries, but lack of trained providers is a barrier to its utility in these settings. In Liberia, given that midwives provide most prenatal care, it is hypothesized that training them in prenatal ultrasound through an intensive condensed training course is both feasible and practical. METHODS This quantitative prospective study of preobservational and postobservational assessment evaluated a 1-week ultrasound curriculum consisting of 4 modules, each comprising a didactic component, a practical session, and supervised patient encounters. A knowledge-based pretest and presurvey addressing prior use and comfort were administered. At the intervention conclusion, identical posttests and postsurveys were administered with an objective structured clinical examination (OSCE). The test, survey, and OSCE were repeated after 1 year. All scores and responses were tabulated, and qualitative analysis with paired t tests was performed. RESULTS Thirty-one midwives underwent intervention and written evaluation, with 14 followed up at 1 year. Seventeen underwent the OSCE, with 8 retained at 1 year. There was a significant increase between pretest and immediate and 1-year posttest scores (36.6% versus 90% and 66%; P < .001) but no difference between immediate and 1-year posttest scores (90% versus 66%; P > .05). Average overall comfort using ultrasound increased from presurvey to immediate postsurvey scores (from 1.8 to 3.8; P< .001) and remained higher at the 1-year postsurvey (1.8 to 3.4; P< .05). Overall OSCE scores remained high from immediately after the OSCE to 1 year after the OSCE (78% to 55%; P > .05). CONCLUSIONS Midwives in Liberia had very low baseline knowledge and comfort using ultrasound. A 1-week curriculum increased both short- and long-term knowledge and comfort and led to adequate overall OSCE scores that were retained at 1 year.
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Yvonne Chan YF, Nagurka R, Bentley S, Ordonez E, Sproule W. Medical utilization of kiosks in the delivery of patient education: a systematic review. Health Promot Perspect 2014; 4:1-8. [PMID: 25097831 DOI: 10.5681/hpp.2014.001] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2013] [Accepted: 11/02/2013] [Indexed: 11/17/2022] Open
Abstract
BACKGROUND The utilization of kiosks has previously been shown to be effective for collecting information, delivering educational modules, and providing access to health information. We discuss a review of current literature for the utilization of kiosks for the delivery of patient education. METHODS The criteria for inclusion in this literature review were: (1) study discusses the utilization of kiosks for patient health education; (2) study discusses the use of touch screens for patient health information; (3) published in English. Our review includes searches via MEDLINE databases and Google Scholar for the years 1996-2014. RESULTS Overall, 167 articles were screened for final eligibility, and after discarding duplicates and non-eligible studies with abstract. Full-text review of 28 articles was included in the final analysis. CONCLUSION The review of available literature demonstrates the effectiveness of touch screen kiosks to educate patients and to improve healthcare, both at a performance and cost advantage over other modes of patient education.
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Havryliuk T, Bentley S, Hahn S. Global health education in emergency medicine residency programs. J Emerg Med 2014; 46:847-52. [PMID: 24613226 DOI: 10.1016/j.jemermed.2013.11.101] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2013] [Revised: 09/21/2013] [Accepted: 11/17/2013] [Indexed: 11/17/2022]
Abstract
BACKGROUND Interest in global health and international electives is growing among Emergency Medicine (EM) residents in the United States (US). The majority of EM residency programs offer opportunities for international electives. The degree of participation among residents and type of support provided by the residency program, however, remains unclear. STUDY OBJECTIVES To explore the current state of global health education among EM residents who participate in international electives. METHODS A 12-question survey was e-mailed to the program directors of the 192 EM residency programs in the US. The survey included questions about the number of residents participating in international electives and the types of preparation, project requirements, supervision, and feedback participating residents receive. RESULTS The response rate was 53% with 102 responses. Seventy-five of 102 (74%) programs reported that at least one resident participated in an international elective in the 2010-2011 academic year. Forty-three programs (42%) report no available funding to support any resident on an international elective. Residents receive no preparation for international work in 41 programs (40%). Only 25 programs (26%) required their residents to conduct a project while abroad. Forty-nine programs (48%) reported no formal debriefing session, and no formal feedback was collected from returning residents in 57 of 102 (59%) programs. CONCLUSION The majority of EM residencies have residents participating in international electives. However, the programs report variable preparation, requirements, and resident supervision. These results suggest a need for an expanded and more structured approach to international electives undertaken by EM residents.
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Martin IB, Jacquet GA, Levine AC, Douglass K, Pousson A, Dunlop S, Khanna K, Bentley S, Tupesis JP. Global health and emergency care: a postgraduate medical education consensus-based research agenda. Acad Emerg Med 2013; 20:1233-40. [PMID: 24341578 DOI: 10.1111/acem.12258] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2013] [Revised: 08/20/2013] [Accepted: 08/21/2013] [Indexed: 11/29/2022]
Abstract
Global emergency medicine (EM) is a rapidly growing field within EM, as evidenced by the increasing number of trainees and clinicians pursuing additional experiences in global health and emergency care. In particular, many trainees now desire opportunities at the postgraduate level by way of global EM fellowship programs. Despite this growing popularity, little is known of the effects of postgraduate training in global health and emergency care on learners and patients in the United States and abroad. During the 2013 Academic Emergency Medicine consensus conference on global health and emergency care, a group of leading educators at the postgraduate medical education level convened to generate a research agenda of pressing questions to be answered in this area. The consensus-based research agenda is presented in this article.
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Martin IBK, Devos E, Jordan J, Malya R, Tupesis JP, Bentley S, Flemister A, Kapur GB. Global health and emergency care: an undergraduate medical education consensus-based research agenda. Acad Emerg Med 2013; 20:1224-32. [PMID: 24341577 DOI: 10.1111/acem.12263] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2013] [Revised: 08/15/2013] [Accepted: 08/16/2013] [Indexed: 01/05/2023]
Abstract
Global emergency medicine (EM) is a rapidly growing field within EM, as evidenced by the increasing number of medical students desiring global health and emergency care experiences. Despite this growing popularity, little is known of the effect of undergraduate medical education in global health on learners and patients in the United States and abroad. During the 2013 Academic Emergency Medicine consensus conference, a group of leading medical school educators convened to generate a research agenda on priority questions to be answered in this arena. This consensus-based research agenda is presented in this article.
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Bentley S. The “What If” Curriculum of Common Emergency Critical Care Procedures. Ann Emerg Med 2013. [DOI: 10.1016/j.annemergmed.2013.07.279] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Bentley S, Gupta A, Balfour-Lynn I. Subtherapeutic itraconazole and voriconazole levels in children with cystic fibrosis. J Cyst Fibros 2013; 12:418-9. [DOI: 10.1016/j.jcf.2012.09.007] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2012] [Revised: 09/25/2012] [Accepted: 09/25/2012] [Indexed: 10/27/2022]
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Grad Y, Kirkcaldy R, Dordel J, Goldstein E, Trees D, Weinstock H, Parkhill J, Hanage WP, Bentley S, Lipsitch M. YI.4 Gonococcal Genomics Shows Impact of Recombination on Obscuring Phylogenetic Signal and Disseminating Resistance Loci. Br J Vener Dis 2013. [DOI: 10.1136/sextrans-2013-051184.0081] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Grad YH, Kirkcaldy R, Trees D, Dordel J, Goldstein E, Weinstock H, Parkhill J, Hanage WP, Bentley S, Lipsitch M. O03.4 Genomic Epidemiology of Neisseria Gonorrhoeae with Reduced Susceptibility to Cefixime in the United States. Br J Vener Dis 2013. [DOI: 10.1136/sextrans-2013-051184.0098] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Lakoff D, Strayer R, Bentley S, Shah K. 37 A Blog-Format Asynchronous Learning Experience. Ann Emerg Med 2012. [DOI: 10.1016/j.annemergmed.2012.07.060] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Bentley S, Nelson B, Strother C. 319 Are Live Ultrasound Models Replaceable? Traditional versus Simulated Education Module for Ultrasound FAST. Ann Emerg Med 2011. [DOI: 10.1016/j.annemergmed.2011.06.350] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Liuzzo G, Manfredi A, Rossi R, Bentley S, Serraino A. TIMING OF INFORMATION FLOW IN THE RASFF AND EFFECTIVENESS ASSESSMENT OF RECALL/WITHDRAWAL. A CASE STUDY IN THE ASL OF MODENA. Ital J Food Saf 2011. [DOI: 10.4081/ijfs.2011.1.55] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
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Liuzzo G, Bonilauri P, Leonelli R, Serraino A, Bentley S. PRELIMINARY CONSIDERATIONS ON SUSHI AS POTENTIALLY HAZARDOUS FOOD. Ital J Food Saf 2011. [DOI: 10.4081/ijfs.2011.1s.129] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
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Chan YF, Alagappan K, Rella J, Bentley S, Soto-Greene M, Martin M. Interpreter services in emergency medicine. J Emerg Med 2008; 38:133-9. [PMID: 18571358 DOI: 10.1016/j.jemermed.2007.09.045] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2007] [Revised: 09/07/2007] [Accepted: 09/08/2007] [Indexed: 11/27/2022]
Abstract
Emergency physicians are routinely confronted with problems associated with language barriers. It is important for emergency health care providers and the health system to strive for cultural competency when communicating with members of an increasingly diverse society. Possible solutions that can be implemented include appropriate staffing, use of new technology, and efforts to develop new kinds of ties to the community served. Linguistically specific solutions include professional interpretation, telephone interpretation, the use of multilingual staff members, the use of ad hoc interpreters, and, more recently, the use of mobile computer technology at the bedside. Each of these methods carries a specific set of advantages and disadvantages. Although professionally trained medical interpreters offer improved communication, improved patient satisfaction, and overall cost savings, they are often underutilized due to their perceived inefficiency and the inconclusive results of their effect on patient care outcomes. Ultimately, the best solution for each emergency department will vary depending on the population served and available resources. Access to the multiple interpretation options outlined above and solid support and commitment from hospital institutions are necessary to provide proper and culturally competent care for patients. Appropriate communications inclusive of interpreter services are essential for culturally and linguistically competent provider/health systems and overall improved patient care and satisfaction.
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Panerai RB, Sammons EL, Smith SM, Rathbone WE, Bentley S, Potter JF, Samani NJ. Continuous estimates of dynamic cerebral autoregulation: influence of non-invasive arterial blood pressure measurements. Physiol Meas 2008; 29:497-513. [PMID: 18401070 DOI: 10.1088/0967-3334/29/4/006] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Temporal variability of parameters which describe dynamic cerebral autoregulation (CA), usually quantified by the short-term relationship between arterial blood pressure (BP) and cerebral blood flow velocity (CBFV), could result from continuous adjustments in physiological regulatory mechanisms or could be the result of artefacts in methods of measurement, such as the use of non-invasive measurements of BP in the finger. In 27 subjects (61+/-11 years old) undergoing coronary artery angioplasty, BP was continuously recorded at rest with the Finapres device and in the ascending aorta (Millar catheter, BP(AO)), together with bilateral transcranial Doppler ultrasound in the middle cerebral artery, surface ECG and transcutaneous CO(2). Dynamic CA was expressed by the autoregulation index (ARI), ranging from 0 (absence of CA) to 9 (best CA). Time-varying, continuous estimates of ARI (ARI(t)) were obtained with an autoregressive moving-average (ARMA) model applied to a 60 s sliding data window. No significant differences were observed in the accuracy and precision of ARI(t) between estimates derived from the Finapres and BP(AO). Highly significant correlations were obtained between ARI(t) estimates from the right and left middle cerebral artery (MCA) (Finapres r=0.60+/-0.20; BP(AO) r=0.56+/-0.22) and also between the ARI(t) estimates from the Finapres and BP(AO) (right MCA r=0.70+/-0.22; left MCA r=0.74+/-0.22). Surrogate data showed that ARI(t) was highly sensitive to the presence of noise in the CBFV signal, with both the bias and dispersion of estimates increasing for lower values of ARI(t). This effect could explain the sudden drops of ARI(t) to zero as reported previously. Simulated sudden changes in ARI(t) can be detected by the Finapres, but the bias and variability of estimates also increase for lower values of ARI. In summary, the Finapres does not distort time-varying estimates of dynamic CA obtained with a sliding window combined with an ARMA model, but further research is needed to confirm these findings in healthy subjects and to assess the influence of different physiological manoeuvres.
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Galbally I, Meyer M, Bentley S, Weeks I, Leuning R, Kelly K, Phillips F, Barker-Reid F, Gates W, Baigent R, Eckard R, Grace P. A study of environmental and management drivers of non-CO2 greenhouse gas emissions in Australian agro-ecosystems. ACTA ACUST UNITED AC 2007. [DOI: 10.1080/15693430500395396] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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