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STUDY OBJECTIVE: A Bayesian network can estimate a numeric pretest probability of venous thromboembolism on the basis of values of clinical variables. We determine the accuracy with which a Bayesian network can identify patients with a low pretest probability of venous thromboembolism, defined as less than or equal to 2%. METHODS: Using commercial software, we derived a population of Bayesian networks from 25 input variables collected on 3,145 emergency department (ED) patients with suspected venous thromboembolism who underwent standardized testing, including pulmonary vascular imaging, and 90-day follow-up (11.0% of patients were venous thromboembolism positive). The best-fit Bayesian network was selected using a genetic algorithm. The selected Bayesian network was tested in a validation population of 1,423 ED patients prospectively evaluated for venous thromboembolism, including 90-day follow-up (8.0% were venous thromboembolism positive). The Bayesian network probability estimate was normalized to a score of 0% to 100%. RESULTS: Of 1,423 patients in the validation cohort, 711 (50%; 95% confidence interval [CI] 47% to 52%) had a score less than or equal to 2% that predicted a low pretest probability. Of these 711 patients, 700 (98.5%; 95% CI 97.2% to 99.2%) had no venous thromboembolism at follow-up. CONCLUSION: A Bayesian network, derived and independently validated in ED populations, identified half of the validation cohort as having a low pretest probability (< or =2%); 98.5% of these patients were correctly classified by the network. [ABSTRACT FROM AUTHOR]

Introduction: History is an important component of emergency department risk stratification for chest pain patients. We hypothesized that a significant portion of patients would not be able to accurately report their history of coronary artery disease (CAD) and diagnostic testing., Methods: We prospectively enrolled a convenience sample of a cohort of adult ED patients with a chief complaint of chest pain. They completed a structured survey that included questions regarding prior testing for CAD and cardiac history. Study authors performed a structured chart review within the electronic medical record for our 6-hospital system. Results of testing for CAD, cardiac interventions, and chart diagnoses of CAD/acute myocardial infarction (AMI) were recorded. Categorical data were analyzed by Chi-square and continuous data by logistic regression., Results: About 196 patients were enrolled; mean age 57 ± 15 years, 48% female, 67% Hispanic, 50% income <$20,000/year. About 43% (95% confidence interval [CI] 35%-51%) of patients stated that they did not have CAD, yet medical records indicated that they were CAD+. With increasing age, patients were more likely to accurately report the absence of CAD ( P < 0.001). There was no association between patients reporting no CAD, but CAD+ in records with respect to the following characteristics: female gender ( P = 0.37), Hispanic race ( P = 0.73), income ( P = 0.41), less than or equal to high school education ( P = 0.11), and private insurance ( P = 0.71). For patients with prior AMI, 7.2% (95% CI 2.7%-11%) reported no prior history of AMI., Conclusions: Within our study group from a predominantly poor, Hispanic population, patients had a poor recall for the presence of CAD in their medical history., Competing Interests: There are no conflicts of interest., (Copyright: © 2022 Journal of Emergencies, Trauma, and Shock.)

Background: The aim of this study was to investigate the utility of early point-of-care (POC) lactate levels to help predict injury severity and ultimate emergency department (ED) disposition for trauma patients meeting Level II and III activation criteria., Methods: This was a blinded, prospective cohort study including a convenience sample of patients meeting our triage criteria for Level II or III team activation with stable vital signs. Bedside lactate samples were collected during the secondary survey. Clinical care/disposition was at the discretion of physicians who remained blinded to the bedside lactate result. An elevated lactate was defined as >2.0 mmol/L., Results: Ninety-six patients were in the study group; mean age was 41 ± 17 years, 26% were female, 57% were Hispanic, and 60% admitted. We found no difference in initial mean POC lactate levels (mmol/L) for admitted versus discharged groups and Injury Severity Score (ISS) ≥9 versus ISS <9 groups (3.71 [95% confidence interval (CI): 3.1-4.4] vs. 3.85 [95% CI: 2.8-4.9]; P = 0.99 and 3.54 [95% CI: 2.7-4.4] vs. 3.89 [95% CI: 3.1-4.6]; P = 0.60, respectively). Performance characteristics of early elevated lactate levels were poor both to predict need for hospital admission (sensitivity = 77% [65%-87%]; specificity = 26% [13%-43%]; negative predictive value [NPV] = 43% [27%-61%]; and positive predictive value [PPV] = 62% [56%-67%]) and to identify patients with ISS scores ≥9 (sensitivity = 76% [59%-89%]; specificity = 24% [14%-37%]; NPV = 65% [47%-80%]; and PPV = 36% [30%-41%])., Conclusions: For Level II/III, we found that early bedside lactate levels were not predictive of ISS ≥9 or the need for admission., Level of Evidence: III (diagnostic test)., Competing Interests: There are no conflicts of interest.

Background: Prior research has revealed that cervical collars elevate intracranial pressure (ICP) in patients with traumatic brain injury. Two recent small studies evaluated the change in optic sheath nerve diameter (ONSD) measured by ultrasound as a proxy for ICP following cervical collar placement in healthy volunteers., Objective: We sought to validate the finding that ONSD measured by ultrasound increases after cervical collar placement within an independent data set., Methods: This was a prospective, crossover study involving volunteers. Participants were randomized to either have the ONSD measured first without a cervical collar or initially with a cervical collar. Two sonographers performed independent ONSD diameter measurements. Continuous data were analyzed by matched-paired t -tests. Alpha was set at 0.05. The primary outcome parameter was the overall mean difference between ONSD measurements with the cervical collar on and off. Multiple linear regression was performed to examine the relationship between variables and the primary outcome parameter., Results: There were 30 participants enrolled in the study. Overall mean ONSD for participants without the collar was 0.365 ± 0.071 cm and with the collar was 0.392 ± 0.081 cm. The mean change in ONSD for participants with and without the collar was 0.026 ± 0.064 cm (95% confidence interval of difference: 0.015-0.038; P < 0.001). Multiple regression analysis did not identify any variables associated with the variation in ONSD observed for collar versus noncollar., Conclusions: We confirmed that ONSD does vary by a measurable amount with placement of a rigid cervical collar on healthy volunteers when assessed by ultrasound., Competing Interests: There are no conflicts of interest.

Background: The objective of this study was to evaluate the costs, characteristics, and outcomes of patients brought to a Texas trauma center emergenct department after apprehension by Border Patrol (BP)/Immigration and Customs Enforcement (BP/ICE)., Materials and Methods: This is a secondary analysis of a trauma registry/financial records (1/1/11-12/31/14). Data were extracted utilizing a structured form. A multivariate ordinary least square was estimated to identify variables associated with hospital charges., Results: A total of 128 patients were enrolled as the study group; mean age was 28.6 ± 6 years, 20.3% were female, 100% were Hispanic, the most common mechanism of injury (MOI) was motor vehicle crash (75%), and mean charge was $162,152 ± $295,441. Mean length of stay (LOS) was 13.2 ± 29.8 days; 92.2% survived to discharge. Bivariate analysis revealed that MOI differed by gender ( P = 0.021). In the multivariate analysis, the only variable that associated with increased charge was LOS. Total charges for the 128 patients were $20.6M, total costs were $4.5M, and total payments were $0.99M., Conclusions: Undocumented immigrants apprehended by BP/ICE and brought to our trauma center utilized significant health-care resources., Competing Interests: There are no conflicts of interest.

Background: Prior research reveals that overweight patients have higher emergency department (ED) utilization rates, longer length of stay, and face increased misdiagnosis risk., Objective: The objective of this study was to evaluate the association between obesity and ED patient satisfaction., Methods: This study was a cross-sectional study. A convenience sample of inner-city ED patients completed a written survey, then rated overall satisfaction with ED care (10-point scale), and rated components of satisfaction (4-point scale; never to always). Body mass index (BMI) was calculated using triage records (obesity = BMI >30)., Results: Five hundred and sixty-four patients were included in the study group (50.5%: obese, 55.4%: female, mean age: 43.2 ± 25.4 years). With respect to overall visit satisfaction (rating 8 or greater on 10-point scale), bivariate analysis revealed no differences between nonobese versus obese patients (74.6% vs. 73.9%; P = 0.85). There were no significant differences for score of 4 (always) for components of ED satisfaction: physician courtesy (87.9% vs. 90.4%; P = 0.34), nurse courtesy/respect (89.2% vs. 88.7%; P = 0.87), doctor listened (85.4% vs. 87.1%; P = 0.5), doctor explained (80.2% vs. 85.0%; P = 0.14), and recommend to friend (72.5% vs. 81.1%; P = 0.02). Within our multivariate model, obesity was not associated with overall satisfaction (scores of 8 or greater) ( P = 0.97; odds ratio = 0.99 [95% confidence interval = 0.65-1.5])., Conclusions: Despite research that suggests that overweight patients have characteristics of their ED visit that might increase dissatisfaction risk, we found no difference in satisfaction scores between nonobese and obese patients., Competing Interests: There are no conflicts of interest.

Background and Objectives: The infiltration of local anesthetic is consistently described as painful by patients. Vibration anesthesia has been studied in the dental literature as a promising tool to alleviate the pain from dental nerve blocks. Many of these studies used a specific device, the DentalVibe. To date, there have not been any studies applying this technology to digital blocks of the hand in human subjects. We hypothesized that the use of microvibratory stimulation during digital blocks of the hand would decrease pain reported by patients., Methods: This was a randomized controlled trial of consenting adult emergency department patients who received digital block anesthesia for hand digit therapy when study authors were present. The study period was 24 months at an academic emergency department. A sample size of 50 injections (25 subjects) was necessary for a power of 80% to detect a mean difference of 2 (SD, 2.5) on the pain scale. A 2-sided dorsal injection approach was used for digital blocks. Subjects were randomized to either intervention (vibration) for the first injection or sham (device off). Both intervention and sham were held in place for 5 seconds prior to and during injection. Subjects were given 2 mL of 1% lidocaine and asked to rate the injection pain on a 1- to 10-point scale. This process was then repeated. Mean pain scores were compared using paired t tests. Our primary outcome was the difference in mean injection pain score between sham versus intervention groups., Results: There were 25 patients in the study group (mean age, 35.52 years [range, 18-58 years]; 8 females; 11 non-Hispanic white). The mean injection pain score in the sham group was 4.28 (95% confidence interval [CI], 3.14-5.42), and in the intervention group, the mean pain score was 2.52 (95% CI, 1.62-3.42). For the primary outcome, the mean injection pain score difference between the sham and intervention groups across all subjects was 1.76 (95% CI, 0.49-3.03; P = 0.009). The mean injection pain score differences were similar across groups: females versus males (0.24; 95% CI, -2.31 to 2.79; P = 0.85), non-Hispanic whites versus other races (0.76; 95% CI, -1.78 to 3.29; P = 0.54), intervention first versus sham first (-0.43; 95% CI, -3.25 to 2.40; P = 0.75)., Conclusions: Our results show a statistically significant difference in mean injection pain score during digital block of the hand when the DentalVibe device is used for vibration anesthesia. Larger studies are warranted to confirm our findings.

Objectives: There is a paucity of research evaluating the risk tolerance of Emergency Department (ED) patients. We hypothesized that a significant percentage of ED patients surveyed would be comfortable with ≥5% risk of adverse outcome if they avoided testing in several hypothetical scenarios., Materials and Methods: This was a cross-sectional study of a convenience sample of stable inner-city ED patients. Patients completed a written survey and were asked four closed-answer questions regarding risk tolerance/willingness to refuse a test/procedure, including the following scenarios: #1: LP following CT head; #2 overnight serial troponins for rule out myocardial infarction; #3 CT for possible appendicitis, #4 parent deciding whether child should undergo head CT for low risk head injury. Risk preferences were stratified to ≥5% (high) and <5% (low). Multivariate logistic regressions performed for each scenario to control for confounding factors., Results: There were 217 patients in the study group; mean age 42 ± 15 years, 48% female, 66% Hispanic, 87% income < $40,000 income group. A substantial percentage of patients rated high risk tolerance for each scenario, including 31% for #1 (avoid LP), 25% for #2 (avoid cardiac rule-out admission), 27% for #3 (avoid CT for appendicitis), and 19% for #4 (avoid head CT for child)., Discussion: For 3 of 4 scenarios, 25% or more of our patients would accept a high risk tolerance of adverse outcome to avoid further testing., Conclusion: Our findings contribute further evidence to the growing body of literature supporting patient interest in shared decision making in the ED.

Background: Emergency Department (ED) service evaluations are typically based on surveys of discharged patients. Physicians/administrators benefit from data that quantifies system-based factors that adversely impact the experience of those who represent the survey cohort., Objective: While investigators have established that admitted patient boarding impacts overall ED throughput times, we sought to specifically quantify the relationship between throughput times for patients admitted (EDLOS) versus discharged home from the ED (DCLOS)., Methods: We performed a prospective analysis of consecutive patient encounters at an inner-city ED. Variables collected: median daily DCLOS for ED patients, ED daily census, left without being seen (LWBS), median door to doctor, median room to doctor, and daily number admitted. Admitted patients divided into 2 groups based on daily median EDLOS for admits (<6 hours, ≥6 hours). Continuous variables analyzed by t-tests. Multivariate regression utilized to identify independent effects of the co-variants on median daily DCLOS., Results: We analyzed 24,127 patient visits. ED patient DCLOS was longer for patients seen on days with prolonged EDLOS (193.7 minutes, 95%CI 186.7-200.7 vs. 152.8, 144.9-160.5, P< .0001). Variables that were associated with increased daily median EDLOS for admits included: daily admits (P= 0.01), room to doctor time (P< .01), number of patients that left without being seen (P< .01). When controlling for the covariate daily census, differences in DCLOS remained significant for the ≥6 hours group (189.4 minutes, 95%CI 184.1-194.7 vs. 164.8, 155.7-173.9 (P< .0001)., Conclusion: Prolonged ED stays for admitted patients were associated with prolonged throughput times for patients discharged home from the ED., (Copyright © 2016 Elsevier Inc. All rights reserved.)

Objective. We hypothesized that a significant percentage of patients who are referred to the Emergency Department (ED) after calling their primary care physician's (PCP) office receive such instructions without the input of a physician. Methods. We enrolled a convenience sample of stable adults at an inner-city ED. Patients provided written answers to structured questions regarding PCP contact prior to the ED visit. Continuous data are presented as means ± standard deviation; categorical data as frequency of occurrence. 95% confidence intervals were calculated. Results. The study group of 660 patients had a mean age of 41.7 ± 14.7 years and 72.6% had income below $20,000/year. 472 patients (71.51%; 67.9%-74.8%) indicated that they had a PCP. A total of 155 patients (23.0%; 19.9%-26.4%) called to contact their PCP prior to ED visit. For patients who called their PCP office and were directed by phone to the ED, the referral pattern was observed as follows: 31/98 (31.63%; 23.2%-41.4%) by a non-health care provider without physician input, 11/98 (11.2%; 6.2%-19.1%) by a non-healthcare provider after consultation with a physician, 12/98 (12.3%; 7.7%-20.3%) by a nurse without physician input, and 14/98 (14.3%; 8.6%-22.7%) by a nurse after consultation with physician. An additional 11/98, 11.2%; 6.2-19.1%) only listened to a recorded message and felt the message was directing them to the ED. Conclusion. A relatively small percentage of patients were referred to the ED without the consultation of a physician in our overall population. However, over half of those that contacted their PCP's office felt directed to the ED by non-health care staff.

Objective. A single PAN scan may provide more radiation to a patient than is felt to be safe within a one-year period. Our objective was to determine how many patients admitted to the trauma service following a PAN scan had prior CT imaging within our six-hospital system. Methods. We performed a secondary analysis of a prospectively collected trauma registry. The study was based at a level-two trauma center and five affiliated hospitals, which comprise 70.6% of all Emergency Department visits within a twelve county region of southern Texas. Electronic medical records were reviewed dating from the point of trauma evaluation back to December 5, 2005 to determine evidence of prior CT imaging. Results. There were 867 patients were admitted to the trauma service between January 1, 2012 and December 31, 2012. 460 (53%) received a PAN scan and were included in the study group. The mean age of the study group was 37.7 ± 1.54 years old, 24.8% were female, and the mean ISS score was 13.4 ± 1.07. The most common mechanism of injury was motor vehicle collision (47%). 65 (14%; 95% CI [11-18]%) of the patients had at least one prior CT. The most common prior studies performed were: CT head (29%; 19-42%), CT Face (29%; 19-42%) and CT Abdomen and Pelvis (18%; 11-30%). Conclusion. Within our trauma registry, 14% of patients had prior CT imaging within our hospital system before their traumatic event and PAN scan.

Background. Cultural differences and language barriers may adversely impact patients with respect to understanding the risks/benefits of medical testing. Objective. We hypothesized that there would be no difference in Hispanic vs. non-Hispanic patients' knowledge of radiation risk that results from CT of the abdomen/pelvis (CTAP). Methods. We enrolled a convenience sample of adults at an inner-city emergency department (ED). Patients provided written answers to rate agreement on a 10-point scale for two correct statements comparing radiation exposure equality between: CTAP and 5 years of background radiation (question 1); CTAP and 200 chest x-rays (question 3). Patients also rated their agreement that multiple CT scans increase the lifetime cancer risk (question 2). Scores of >8 were considered good knowledge. Multivariate logistic regression analyses were performed to estimate the independent effect of the Hispanic variable. Results. 600 patients in the study group; 63% Hispanic, mean age 39.2 ± 13.9 years. Hispanics and non-Hispanics whites were similar with respect to good knowledge-level answers to question 1 (17.3 vs. 15.1%; OR = 1.2; 95% CI [0.74-2.0]), question 2 (31.2 vs. 39.3%; OR = 0.76; 95% CI [0.54-1.1]), and question 3 (15.2 vs. 16.5%; OR = 1.1; 95% CI [0.66-1.8]). Compared to patients who earned <20,000, patients with income >40,000 were more likely to answer question 2 with good knowledge (OR = 1.96; 95% CI [1.2-3.1]). Conclusion. The study group's overall knowledge of radiation risk was poor, but we did not find significant differences between Hispanic vs. non-Hispanic patients.

Background: Many patients have unexplained persistent dyspnea after negative computed tomographic pulmonary angiography (CTPA). We hypothesized that many of these patients have isolated right ventricular (RV) dysfunction from treatable causes. We previously derived a clinical decision rule (CDR) for predicting RV dysfunction consisting of persistent dyspnea and normal CTPA, finding that 53% of CDR-positive patients had isolated RV dysfunction. Our goal is to validate this previously derived CDR by measuring the prevalence of RV dysfunction and outcomes in dyspneic emergency department patients., Methods: A secondary analysis of a prospective observational multicenter study that enrolled patients presenting with suspected PE was performed. We included patients with persistent dyspnea, a nonsignificant CTPA, and formal echo performed. Right ventricular dysfunction was defined as RV hypokinesis and/or dilation with or without moderate to severe tricuspid regurgitation., Results: A total of 7940 patients were enrolled. Two thousand six hundred sixteen patients were analyzed after excluding patients without persistent dyspnea and those with a significant finding on CTPA. One hundred ninety eight patients had echocardiography performed as standard care. Of those, 19% (95% confidence interval [CI], 14%-25%) and 33% (95% CI, 25%-42%) exhibited RV dysfunction and isolated RV dysfunction, respectively. Patients with isolated RV dysfunction or overload were more likely than those without RV dysfunction to have a return visit to the emergency department within 45 days for the same complaint (39% vs 18%; 95% CI of the difference, 4%-38%)., Conclusion: This simple clinical prediction rule predicted a 33% prevalence of isolated RV dysfunction or overload. Patients with isolated RV dysfunction had higher recidivism rates and a trend toward worse outcomes., (Copyright © 2015 Elsevier Inc. All rights reserved.)

Objectives: Available D-dimer assays have low specificity and may increase radiographic testing for pulmonary embolism (PE). To help clinicians better target testing, this study sought to quantify the effect of risk factors for a positive quantitative D-dimer in patients evaluated for PE., Methods: This was a prospective, multicenter, observational study. Emergency department (ED) patients evaluated for PE with a quantitative D-dimer were eligible for inclusion. The main outcome of interest was a positive D-dimer. Odds ratio (ORs) and 95% confidence intervals (CIs) were determined by multivariable logistic regression. Adjusted estimates of relative risk were also calculated., Results: A total of 4,346 patients had D-dimer testing, of whom 2,930 (67%) were women. A total of 2,500 (57%) were white, 1,474 (34%) were black or African American, 238 (6%) were Hispanic, and 144 (3%) were of other race or ethnicity. The mean (+/-SD) age was 48 (+/-17) years. Overall, 1,903 (44%) D-dimers were positive. Model fit was adequate (c-statistic = 0.739, Hosmer and Lemeshow p-value = 0.13). Significant positive predictors of D-dimer positive included female sex; increasing age; black (vs. white) race; cocaine use; general, limb, or neurologic immobility; hemoptysis; hemodialysis; active malignancy; rheumatoid arthritis; lupus; sickle cell disease; prior venous thromboembolism (VTE; not under treatment); pregnancy and postpartum state; and abdominal, chest, orthopedic, or other surgery. Warfarin use was protective. In contrast, several variables known to be associated with PE were not associated with positive D-dimer results: body mass index (BMI), estrogen use, family history of PE, (inactive) malignancy, thrombophilia, trauma within 4 weeks, travel, and prior VTE (under treatment)., Conclusions: Many factors are associated with a positive D-dimer test. The effect of these factors on the usefulness of the test should be considered prior to ordering a D-dimer., ((c) 2010 by the Society for Academic Emergency Medicine.)

Study Objective: Acute pulmonary embolism can produce abnormalities on ECG that reflect severity of pulmonary hypertension. Early recognition of these findings may alter the estimated pretest probability of pulmonary embolism and prompt more aggressive treatment before hemodynamic instability ensues, but it is first important to test whether these findings are specific to patients with pulmonary embolism. We hypothesize that ECG findings consistent with pulmonary hypertension would be observed more frequently in patients with pulmonary embolism., Methods: Secondary analysis of a prospective, observational cohort of emergency department patients who were tested for pulmonary embolism. ECGs were ordered at clinician's discretion and interpreted at presentation., Results: Six thousand forty-nine patients had an ECG, 354 (5.9%) of whom were diagnosed with pulmonary embolism. The frequency, positive likelihood ratio (LR+) and 95% confidence interval (CI) of each predictor were as follows: S1Q3T3 8.5% with pulmonary embolism versus 3.3% without pulmonary embolism (LR+ 3.7; 95% CI 2.5 to 5.4); nonsinus rhythm, 23.5% versus 16.6% (LR+ 1.4; 95% CI 1.2 to 1.7); inverted T waves in V1 to V2, 14.4% versus 8.1% (LR+ 1.8; 95% CI 1.3 to 2.3); inversion in V1 to V3, 10.5% versus 4.0% (LR+ 2.6; 95% CI 1.9 to 3.6); inversion in V1 to V4, 7.3% versus 2.0% (LR+ 3.7; 95% CI 2.4 to 5.5); incomplete right bundle branch block, 4.8% versus 2.8% (LR+ 1.7; 95% CI 1.0 to 2.7); tachycardia (pulse rate >100 beats/min), 28.8% versus 15.7% (LR+ 1.8; 95% CI 1.5 to 2.2). Likelihood ratios and specificities were similar when patients with previous cardiopulmonary disease were excluded from analysis., Conclusion: Findings of acute pulmonary hypertension were infrequent overall but were observed more frequently in patients with the final diagnosis of pulmonary embolism compared with patients who do not have pulmonary embolism., (Copyright (c) 2009 American College of Emergency Physicians. Published by Mosby, Inc. All rights reserved.)

Study Objective: Prediction rules for pulmonary embolism use variables explicitly shown to estimate the probability of pulmonary embolism. However, clinicians often use variables that have not been similarly validated, yet are implicitly believed to modify probability of pulmonary embolism. The objective of this study is to measure the predictive value of 13 implicit variables., Methods: Patients were enrolled in a prospective cohort study from 12 centers in the United States; all had an objective test for pulmonary embolism (D-dimer, computed tomographic angiography, or ventilation-perfusion scan). Clinical features including 12 predefined previously validated (explicit) variables and 13 variables not part of existing prediction rules (implicit) were prospectively recorded at presentation. The primary outcome was venous thromboembolism (pulmonary embolism or deep venous thrombosis), diagnosed by imaging up to 45 days after enrollment. Variables with adjusted odds ratios from logistic regression with 95% confidence intervals not crossing unity were considered significant., Results: Seven thousand nine hundred forty patients (7.2% venous thromboembolism positive) were enrolled. Mean age was 49 years (standard deviation 17 years) and 67% were female patients. Eight of 13 implicit variables were significantly associated with venous thromboembolism; those with an adjusted odds ratio (OR) greater than 1.5 included non-cancer-related thrombophilia (OR 1.99), pleuritic chest pain (OR 1.53), and family history of venous thromboembolism (OR 1.51). Implicit variables that predicted no venous thromboembolism outcome included substernal chest pain, female sex, and smoking. Nine of 12 explicit variables predicted a positive outcome of venous thromboembolism, including patient history of pulmonary embolism or deep venous thrombosis in the past, unilateral leg swelling, recent surgery, estrogen, hypoxemia, and active malignancy., Conclusion: In symptomatic outpatients being considered for possible pulmonary embolism, non-cancer-related thrombophilia, pleuritic chest pain, and family history of venous thromboembolism increase probability of pulmonary embolism or deep venous thrombosis. Other variables that are part of existing pretest probability systems were validated as important predictors in this diverse sample of US emergency department patients., (Copyright (c) 2009 American College of Emergency Physicians. Published by Mosby, Inc. All rights reserved.)

Study Objective: Immobility predisposes to venous thromboembolism, but this risk may vary, depending on the underlying cause of immobility., Methods: This was a prospective, longitudinal outcome study of self-presenting emergency department (ED) patients who were from 12 hospitals and had suspected venous thromboembolism. Using explicit written criteria, clinicians recorded clinical features of each patient in the ED by using a Web-based data form. The form required one of 6 types of immobility: no immobility, general or whole-body immobility greater than 48 hours, limb (orthopedic) immobility, travel greater than 8 hours causing immobility within the previous 7 days, neurologic paralysis, or other immobility not listed above. Patients were followed for 45 days for outcome of venous thromboembolism, which required positive imaging results and clinical plan to treat. Odds ratios (ORs) were derived from logistic regression including 12 covariates., Results: From 7,940 patients enrolled, 545 of 7,940 (6.9%) were diagnosed with venous thromboembolism (354 pulmonary embolism, 72 deep venous thrombosis, 119 pulmonary embolism and deep venous thrombosis). Risk of venous thromboembolism varied, depending on immobility type: limb (OR=2.24; 95% confidence interval [CI] 1.40 to 3.60), general (OR=1.76; 95% CI 1.26 to 2.44), other (OR=1.97; 95% CI 1.25 to 3.09), neurologic (OR=2.23; 95% CI 1.01 to 4.92), and travel (OR=1.19; 95% CI 0.85 to 1.67). Other significant risk factors from multivariate analysis included age greater than 50 years (OR =1.5; 95% CI 1.25 to 1.82), unilateral leg swelling (OR=2.68; 95% CI 2.13 to 3.37), previous venous thromboembolism (OR=2.99; 95% CI 2.41 to 3.71), active malignancy (OR=2.23; 95% CI 1.69 to 2.95), and recent surgery (OR=2.12; 95% CI 1.61 to 2.81)., Conclusion: In a large cohort of symptomatic ED patients, risk of venous thromboembolism was substantially increased by presence of limb, whole-body, or neurologic immobility but not by travel greater than 8 hours. These data show the importance of clarifying the cause of immobility in risk assessment of venous thromboembolism.

Objectives: The utility of D-dimer testing for suspected pulmonary embolism (PE) can be limited by test specificity. The authors tested if the threshold of the quantitative D-dimer can be varied according to pretest probability (PTP) of PE to increase specificity while maintaining a negative predictive value (NPV) of >99%., Methods: This was a prospective, observational multicenter study of emergency department (ED) patients in the United States. Eligible patients had a diagnostic study ordered to evaluate possible PE. PTP was determined by the clinician's unstructured estimate and the Wells score. Five different D-dimer assays were used. D-dimer test performance was measured using 1) standard thresholds and 2) variable threshold values: twice (for low PTP patients), equal (intermediate PTP patients), or half (high PTP patients) of standard threshold. Venous thromboembolism (VTE) within 45 days required positive imaging plus decision to treat., Results: The authors enrolled 7,940 patients tested for PE, and clinicians ordered a quantitative D-dimer for 4,357 (55%) patients who had PTPs distributed as follows: low (74%), moderate (21%), or high (4%). At standard cutoffs, across all PTP strata, quantitative D-dimer testing had a test sensitivity of 94% (95% confidence interval [CI] = 91% to 97%), specificity of 58% (95% CI = 56% to 60%), and NPV of 99.5% (95% CI = 99.1% to 99.7%). If variable cutoffs had been used the overall sensitivity would have been 88% (95% CI = 83% to 92%), specificity 75% (95% CI = 74% to 76%), and NPV 99.1% (95% CI = 98.7% to 99.4%)., Conclusions: This large multicenter observational sample demonstrates that emergency medicine clinicians currently order a D-dimer in the majority of patients tested for PE, including a large proportion with intermediate PTP and high PTP. Varying the D-dimer's cutoff according to PTP can increase specificity with no measurable decrease in NPV.

Study Objective: The aim of this study is to compare rates of bystander cardiopulmonary resuscitation (CPR) for Hispanic and non-Hispanic out-of-hospital cardiac arrest (OOHCA) victims in Arizona., Methods: This is a secondary analysis of consecutive OOHCA victims prospectively enrolled into our statewide OOHCA quality improvement database between November 2004 and November 2006. Continuous data are presented as means +/- SDs and analyzed using t tests; categorical data are presented as frequency of occurrence and analyzed using chi(2). The primary outcome was whether bystander CPR rates were different for Hispanic vs non-Hispanic OOHCA victims. Secondary comparisons were initial cardiac rhythms and survival to hospital discharge., Results: There were 2411 OOHCA victims during the period of analysis. A total of 952 arrests were excluded because ethnicity was not documented; 80 arrests were excluded because they were traumatic. A total of 1379 arrests were included for analysis, of which 273 (19.8%) were Hispanic. Hispanics were less likely to receive bystander CPR than non-Hispanics (32.2% vs 41.5%; P < .0001). Hispanics and non-Hispanics were dissimilar with respect to age (53.2 +/- 25 vs 64.5 +/- 19.3 years; P = .0001), paramedic response time (5.1 vs 5.5 minutes; P = .0006), initial rhythm asystole (53.8% vs 44.5%; P = .005), and initial rhythm ventricular fibrillation (20.5% vs 26.7%; P = .036). Survival to hospital discharge (8.1% vs 7.1%) was not statistically different., Conclusion: In the state of Arizona, significantly fewer Hispanic OOHCA victims receive bystander CPR than non-Hispanics.

Objectives: Recently, investigators described a clinical decision rule for termination of resuscitation (TOR) designed to help determine whether to terminate emergency medical services (EMS) resuscitative efforts for out-of-hospital cardiac arrests (OOHCA). The authors sought to evaluate the hypothesis that TOR would predict no survival for patients in an independent cohort of patients with OOHCA., Methods: This was a retrospective cohort analysis conducted in the state of Arizona. Consecutive, adult, OOHCA were prospectively evaluated from October 2004 through October 2006. A statewide OOHCA database utilizing Utstein-style reporting from 30 different EMS systems was used. Data were abstracted from EMS first care reports and hospital discharge records. The TOR guidelines predict that no survival to hospital discharge will occur if 1) an OOHCA victim does not have return of spontaneous circulation (ROSC), 2) no shocks are administered, and 3) the arrest is not witnessed by EMS personnel. Data were entered into a structured database. Continuous data are presented as means (+/-standard deviations [SD]) and categorical data as frequency of occurrence, and 95% confidence intervals (CIs) were calculated as appropriate. The primary outcome measure was to determine if any cohort member who met TOR criteria survived to hospital discharge., Results: There were 2,239 eligible patients; the study group included 2,180 (97.4%) patients for whom the data were complete; mean age was 64 (+/-11) years, and 35% were female. The majority of patients in the study group met at least one or more of the TOR criteria. A total of 2,047 (93.8%) patients suffered from cardiac arrest that was unwitnessed by EMS; 1,653 (75.8%) had an unwitnessed arrest and no ROSC. With respect to TOR, 1,160 of 2,180 (53.2%) patients met all three criteria; only one (0.09%; 95% CI = 0% to 0.5%) survived to hospital discharge., Conclusions: The authors evaluated TOR guidelines in an independent, statewide OOHCA database. The results are consistent with the findings of the TOR investigation and suggest that this algorithm is a promising tool for TOR decision-making in the field.

Background: Over-investigation of low-risk patients with suspected pulmonary embolism (PE) represents a growing problem. The combination of gestalt estimate of low suspicion for PE, together with the PE rule-out criteria [PERC(-): age < 50 years, pulse < 100 beats min(-1), SaO(2) >or= 95%, no hemoptysis, no estrogen use, no surgery/trauma requiring hospitalization within 4 weeks, no prior venous thromboembolism (VTE), and no unilateral leg swelling], may reduce speculative testing for PE. We hypothesized that low suspicion and PERC(-) would predict a post-test probability of VTE(+) or death below 2.0%., Methods: We enrolled outpatients with suspected PE in 13 emergency departments. Clinicians completed a 72-field, web-based data form at the time of test order. Low suspicion required a gestalt pretest probability estimate of <15%. The main outcome was the composite of image-proven VTE(+) or death from any cause within 45 days., Results: We enrolled 8138 patients, 85% of whom had a chief complaint of either dyspnea or chest pain. Clinicians reported a low suspicion for PE, together with PERC(-), in 1666 patients (20%). At initial testing and within 45 days, 561 patients (6.9%, 95% confidence interval 6.5-7.6) were VTE(+), and 56 others died. Among the low suspicion and PERC(-) patients, 15 were VTE(+) and one other patient died, yielding a false-negative rate of 16/1666 (1.0%, 0.6-1.6%). As a diagnostic test, low suspicion and PERC(-) had a sensitivity of 97.4% (95.8-98.5%) and a specificity of 21.9% (21.0-22.9%)., Conclusions: The combination of gestalt estimate of low suspicion for PE and PERC(-) reduces the probability of VTE to below 2% in about 20% of outpatients with suspected PE.

Context: Out-of-hospital cardiac arrest is a major public health problem., Objective: To investigate whether the survival of patients with out-of-hospital cardiac arrest would improve with minimally interrupted cardiac resuscitation (MICR), an alternate emergency medical services (EMS) protocol., Design, Setting, and Patients: A prospective study of survival-to-hospital discharge between January 1, 2005, and November 22, 2007. Patients with out-of-hospital cardiac arrests in 2 metropolitan cities in Arizona before and after MICR training of fire department emergency medical personnel were assessed. In a second analysis of protocol compliance, patients from the 2 metropolitan cities and 60 additional fire departments in Arizona who actually received MICR were compared with patients who did not receive MICR but received standard advanced life support., Intervention: Instruction for EMS personnel in MICR, an approach that includes an initial series of 200 uninterrupted chest compressions, rhythm analysis with a single shock, 200 immediate postshock chest compressions before pulse check or rhythm reanalysis, early administration of epinephrine, and delayed endotracheal intubation., Main Outcome Measure: Survival-to-hospital discharge., Results: Among the 886 patients in the 2 metropolitan cities, survival-to-hospital discharge increased from 1.8% (4/218) before MICR training to 5.4% (36/668) after MICR training (odds ratio [OR], 3.0; 95% confidence interval [CI], 1.1-8.9). In the subgroup of 174 patients with witnessed cardiac arrest and ventricular fibrillation, survival increased from 4.7% (2/43) before MICR training to 17.6% (23/131) after MICR training (OR, 8.6; 95% CI, 1.8-42.0). In the analysis of MICR protocol compliance involving 2460 patients with cardiac arrest, survival was significantly better among patients who received MICR than those who did not (9.1% [60/661] vs 3.8% [69/1799]; OR, 2.7; 95% CI, 1.9-4.1), as well as patients with witnessed ventricular fibrillation (28.4% [40/141] vs 11.9% [46/387]; OR, 3.4; 95% CI, 2.0-5.8)., Conclusions: Survival-to-hospital discharge of patients with out-of-hospital cardiac arrest increased after implementation of MICR as an alternate EMS protocol. These results need to be confirmed in a randomized trial.

The objective of this study was to assess the ability of citizens in a senior living community (SLC) to perform adequate cardiopulmonary resuscitation (CPR) and appropriately utilize an automated external defibrillator (AED) in a simulated cardiac arrest scenario (SCAS). This study was a prospective, observational study; a convenience sample of SLC residents aged > 54 years was enrolled. Subjects were presented with a SCAS (adult mannequin, bystander available to assist, AED visible). Subjects' skills were rated in standardized fashion. For statistical analysis, 95% confidence intervals (CIs) were calculated as appropriate. There were 51 subjects; 69% were female; mean age was 64 years; 86% were without disabilities. Pre-retirement professions included: medical (13.7%), office/sales (41.2%), and engineer/science (15.7%). Subjects had previous American Heart Association first-responder training (CPR and AED use) as follows: none (22%), within 0 to 6 months (47%), 7-12 months (4%), > 12 months (27%). During the SCAS, subjects performed inconsistently on the various links in the chain of survival. Although most subjects (94%; 95% CI 84-99%) checked for unresponsiveness, only 62.8% (95% CI 48-76%) also specified "call 911 and bring me the AED." Most subjects (88%; 95% CI 76-96%) started chest compressions, however, only a minority provided high quality chest compressions (29%; 95% CI 17-44%). With respect to AED skill performance, we noted the following: 94% (95% CI 84-99%) of subjects removed the patient's clothing, 90% (95% CI 79-97%) turned the device on, 94% delivered a shock as directed, and 82% continued CPR if "no shock indicated" by AED (95% CI 69-92%). Performance was less satisfactory for the following: only 39.2% (95% CI 26-54%) continued chest compressions after AED arrival, 60.8% (95% CI 46-74%) of subjects correctly attached electrodes, and 6% (95% CI 1-16%) verbalized "clear" in advance of shock. Although many members of our sample SLC had prior training, they frequently failed to adequately perform some key steps in the SCAS. Recent efforts to place AEDs in SLCs should be augmented by a plan to adequately train residents and other available individuals (e.g., staff) in CPR/AED use.

Headache is one of the most frequent symptoms prompting an emergency department (ED) visit. For many patients this is an exacerbation of a recurrent or chronic headache pattern. Our objective in this study was to determine if ED patients with recurrent headaches attempt abortive analgesics before seeking ED care. Patients with five or greater similar headache episodes presenting to the ED with the chief complaint of headache were included. There were 150 patients enrolled into the study group. Fourteen percent (95% confidence interval 1-41) of patients did not attempt abortive medication before an ED visit. Males were significantly less likely to utilize pain medication than females before their ED visit (69% vs. 91%; p = 0.003). Of those patients previously seen by a neurologist, 5% did not attempt analgesia before ED arrival, compared to 22% of those who did see a neurologist (p = 0.004). A small, but significant percentage of patients with recurrent headaches do not attempt abortive analgesic therapy before ED encounter. In particular, males and those patients not previously evaluated by a neurologist were significantly less likely to utilize such medications. Further education and selective neurology referral by practitioners may reduce ED utilization in this subset of patients.

Objective: To evaluate a new, 1-h, condensed training programme to teach continuous chest compression cardiopulmonary resuscitation (CCC-CPR) and automated external defibrillator (AED) skills to a cohort of eight grade public school students., Results: Thirty-three eligible subjects completed the programme; mean age 13.7 years; 48.5% female. Eight participants reported some prior training in CPR and AED use. Following initial training, 29/33 (87.8%) subjects demonstrated proficiency at CCC-CPR and AED application/operation in a mock adult cardiac arrest scenario. At four-weeks, 28/33 (84.8%) subjects demonstrated skill retention in similar scenario testing. Subjects also showed improvement in written knowledge regarding AED use as shown by scores on an AHA based written exam (60.9% versus 77.3%; p<0.001)., Conclusion: With our focused, condensed training program, eighth grade public school students became proficient in CCC-CPR and AED use. This is the first study to document the ability of middle school students to learn and retain CCC-CPR and AED skills for adult sudden cardiac arrest victims with such a curriculum.

Introduction: We previously reported that many patients who present to the ED with "migraine" headache do not meet the International Headache Society criteria (IHSC) for the diagnosis of acute migraine. Objective The aim of the study was to compare the frequency for which ED patients with migraine headache meet the Canadian Headache Society criteria (CHSC) vs the IHSC., Methods: This was a prospective, observational study, performed at a community ED. Consecutive patients who presented to study authors with a chief complaint of headache were enrolled. Historical/clinical data were collected on a standardized form. Ninety-five percent confidence intervals (95% CIs) were calculated and Fisher exact test was used as appropriate., Results: One hundred eighty-nine patients were enrolled in this study. Mean age was 38 years. Females comprised 69% of patients. Thirty-seven percent of patients had prior ED visits for headaches. A positive family history of migraines was present in 35% of patients. Diagnostic imaging was previously performed in 44 of the enrollees to evaluate the cause of their headaches. A total of 43 (23%) patients had a prior diagnosis of migraine. Overall CHSC was met in 18% of patients, compared with 15% of patients who met IHSC. Discharge diagnosis of migraine was made in 41% of patients. Of these patients, 33% met CHSC and 28% met IHSC (P=.30). For patients with discharge diagnosis of migraine, 33% of females and 36% of males fit CHSC (P=.53), whereas 26% and 36% met IHSC (P=.34), respectively. For patients with a prior diagnosis of migraine, 32% met CHSC and 26% met IHSC (P=.24). Patients with a prior diagnosis of migraine and/or a discharge diagnosis of migraine met CHSC 31% (95% CI, 22%-40%) of the time vs 25% for the IHSC (95% CI, 16%-34%) (P=.26). Four patients without a discharge and/or previous diagnosis of migraine met CHSC; 3 met IHSC., Conclusions: In our study population, only a minority of patients with headache who have prior diagnosis and/or ED diagnosis of migraine headache met CHSC. The utility of CHSC and/or IHSC to standardize ED patients for headache research may be limited.

To assess the pre-study, null hypothesis that there is no difference in the electrocardiogram (EKG) findings for Emergency Department (ED) patients who rule in vs. rule out for suspected pulmonary embolism, a retrospective review of a cohort of patients with pulmonary embolism and their controls was conducted in an academic, suburban ED. Patients who were evaluated in the ED during a one-year study period for symptoms suggestive of pulmonary embolism were eligible for inclusion. All patients with pulmonary embolism and sex- and age-matched controls comprised the final study groups. Two board-certified cardiologists reviewed each patient's EKG. There were 350 eligible patients identified; 49 patients with pulmonary embolism and 49 controls were entered into the study. The most common rhythm observed in both groups was normal sinus rhythm (67.3% cases vs. 68.6 % controls; p = 1.0). Abnormalities believed to be associated with pulmonary embolism occurred with similar frequency in both case and control groups (sinus tachycardia [18.8 % vs. 11.8%, respectively; p = 0.40]), incomplete right bundle branch block (4.2% vs. 0.0%, respectively; p = 0.24), complete right bundle branch block (4.2% vs. 6.0, respectively; p = 1.0), S1Q3T3 pattern (2.1 vs. 0.0, respectively; p = 0.49), S1Q3 pattern (0.0 vs. 0.0), and extreme right axis (0.0 vs. 0.0). New EKG changes were identified more frequently for patients with pulmonary embolism (33.3% vs. 12.5% controls; p = 0.03), but specific findings were rarely different between cases and controls. In our cohort of ED patients, we did not identify EKG features that are likely to help distinguish patients with pulmonary embolism from those who rule out for the disease.

Overuse of the d-dimer to screen for possible pulmonary embolism (PE) can have negative consequences. This study derives and tests clinical criteria to justify not ordering a d-dimer. The test threshold was estimated at 1.8% using the method of Pauker and Kassirer. The PE rule-out criteria were derived from logistic regression analysis with stepwise backward elimination of 21 variables collected on 3148 emergency department patients evaluated for PE at 10 US hospitals. Eight variables were included in a block rule: Age < 50 years, pulse < 100 bpm, SaO(2) > 94%, no unilateral leg swelling, no hemoptysis, no recent trauma or surgery, no prior PE or DVT, no hormone use. The rule was then prospectively tested in a low-risk group (1427 patients from two hospitals initially tested for PE with a d-dimer) and a very low-risk group (convenience sample of 382 patients with chief complaint of dyspnea, PE not suspected). The prevalence of PE was 8% (95% confidence interval: 7-9%) in the low-risk group and 2% (1-4%) in the very low-risk group on longitudinal follow-up. Application of the rule in the low-risk and very low-risk populations yielded sensitivities of 96% and 100% and specificities of 27% and 15%, respectively. The prevalence of PE in those who met the rule criteria was 1.4% (0.5-3.0%) and 0% (0-6.2%), respectively. The derived eight-factor block rule reduced the pretest probability below the test threshold for d-dimer in two validation populations, but the rule's utility was limited by low specificity.

The objective of this study was to determine if ED triage nurses could appropriately interpret the Ottawa Ankle Rules (OAR). We conducted a prospective, observational trial of a clinical decision rule in a suburban ED on a convenience sample of ED patients, aged >17 years with acute ankle injuries. Nurses and EPs were trained in the appropriate use of the OAR. Nurses and physicians recorded their initial blinded patient assessments on standardized data collection instruments that included the OAR. X-rays were ordered without specific discretion to OAR by nurses or physicians. Sensitivity, specificity, negative predictive value, and positive predictive value were calculated as appropriate; kappa (k) values were calculated to assess interobserver agreement (IOA). One hundred three patients enrolled: mean age 37 +/- 16 years; 67% female; 27 had fractures. IOA between nurses and physicians was moderate for overall interpretation of OAR (kappa = 0.44). IOA (kappa) for each criterion varied from (1) moderate for fifth metatarsal pain (0.56), posterior malleolar pain (0.44), medial malleolar pain (0.40), and weight bearing with foot pain (0.48); to (2) fair for weight bearing with ankle pain (0.32) and navicular pain (0.21). Sensitivity of the nurse's interpretation of OAR for fracture was 92%, specificity 36%, negative predictive value 90%, and positive predictive value 32%. Sensitivity of the EP's utilization of the OAR for fracture was 92%, specificity 47% with a negative predictive value 94%, and a positive predictive value 38%. Nurses showed only a moderate ability to interpret the overall OAR for ordering of x-rays. Nurses' understanding of the individual criterion were variable.

Recent reports suggest that physicians in non-ambulatory settings can use indirect CT venography (CTV) of the lower extremities immediately following spiral CT angiography (CTA) of the chest to identify patients with a negative CTA who have thromboembolic disease identified on CTV. We sought to determine the frequency of isolated deep venous thrombosis (DVT) discovered on CTV in emergency department (ED) patients with complaints suggestive of pulmonary embolism (PE) yet having a negative CTA. This study was conducted in a suburban and urban ED where patients with symptoms suspicious for PE were primarily evaluated with CTA and CTV. A total of 800 patients were studied, including 360 from the suburban ED and 440 from the urban ED. 88 (11%) patients were diagnosed with thromboembolic disease by CTA, or CTV, or both. Seventy-three patients had a CTA of the chest that was positive for PE, 42 (5.2%) of whom had evidence of both PE on CTA and DVT on CTV. Fifteen patients (2%, 95% CI = 1-3%) had a negative CTA and were subsequently found to have isolated DVT on CTV, all of whom received anticoagulation therapy. These data suggest that indirect CT venography of immediately following CT angiography of the chest significantly increased the frequency of diagnosed thromboembolic disease requiring anticoagulation in ED patients with suspected PE.

A recent editorial criticized emergency medicine researchers who study the treatment of acute migraine for failing to standardize patients according to definitions provided by the International Headache Society (IHS). In fact, most emergency medicine-based studies of migraine therapies have not used IHS Criteria (IHSC) for patient inclusion and are not uniform in the definition of acute migraine. The purpose of this study was to determine the percentage of patients with complaint of headache who present to the emergency department with a prior diagnosis of migraine and/or emergency department discharge diagnosis of acute migraine that meet IHSC. The study was a prospective observational study performed in a community-based and consisted of consecutive patients with a chief complaint of headache who presented to any 1 of 6 study investigators. Patients recorded historical data on a standard form; Clinical data were recorded by the investigators. Ninety-five percent confidence intervals and the Fisher exact test were calculated as appropriate. One hundred eighty-five patients were enrolled (study group): 70% were women, 43% had prior imaging studies to diagnose the etiology of the headache, and 26% had a diagnostic workup during the current emergency department visit; the probable headache etiology was found in 12 of these cases. Only 3 patients that had an ED workup that fit IHSC. Forty-nine percent of all patients had a prior diagnosis of migraines; 41 of these patients (45%) met IHSC. Forty-two percent of all patients had an emergency discharge diagnosis of acute migraine; of these, 43 (56%) met IHSC. Forty-four out of 96 (46%; 95% confidence interval = 35%-57%) patients with a prior diagnosis of migraine and/or discharge diagnosis of acute migraine met IHSC. Modification of the IHSC, by removing restrictions for headache duration and number of prior episodes, would have markedly increased the percentage of patients with a previous migraine and/or emergency discharge diagnosis of acute migraine that met other qualitative IHSC (94%). Of the patients with prior migraine diagnosis and/or emergency department diagnosis of acute migraine, men and women were equally as likely to meet IHSC (41% v 48%, P = 0.79). Less than half of patients with a prior diagnosis and/or final emergency discharge diagnosis of acute migraine met IHSC. Our findings raise concerns about the external validity of prior emergency department-based research of acute migraine therapy and the utility of the IHSC for future research. Modification of the IHSC for emergency medicine research should be considered., (Copyright 2002, Elsevier Science (USA). All rights reserved.))

In a recent case series, we reported that intramuscular droperidol appeared to be an effective therapy for the treatment of acute migraine headache. The objective of the study was to further assess the efficacy of intramuscular droperidol for the treatment of acute migraine headache. The study design was a randomized, clinical trial set in a community-based ED. The population was a convenience sample of ED patients who met International Headache Society acute migraine criteria. Exclusions included pregnancy, use of narcotic or phenothiazine medications within 24 hours. For the protocol, patients were randomized to 1 of 2 treatment groups. Patients and physicians were blinded as to the treatment provided. Patients recorded their initial pain on a 100mm Visual Analog Scale (VAS) Patients were randomized to receive either 2.5 mg droperidol intramuscularly; the other group received 1.5 mg/kg meperidine intramuscularly. After 30 minutes patients recorded their pain on the VAS and recorded their preference for the medication on a Likert Scale. Physicians recorded the incidence of any side effects and the need for rescue medication. Statistical analysis consisted of categorical variables that were analyzed by chi-square, continuous interval data by t-tests and ordinal data by Mann-Whitney U test. The primary outcome parameters were mean VAS score change and the percentage of patients who wanted to go home without rescue medication. The study had an 80% power to detect a 26 mm difference in the mean change in VAS between groups. Of the 29 patients who were enrolled, 15 received droperidol. Both groups were similar with respect to age (30.7 +/- 8.9 years droperdol v 32.7 +/- 9.9 years meperidine; P =.59), female sex (73% v 71%; P =.91), mean headache duration (24.7 +/- 28.3 v 18.3 +/- 25.8 hours; P =.55). The droperidol group had a higher mean initial VAS score (88 v 76 mm; P =.03). The 2 groups were similar with regard to outcome, including: mean change in VAS score (47 v 37 mm; P =.33), average Likert score (1.1 v 1.9; P =.85), and the percentage of patients who did not want rescue medication (67% v 57%; P =.61). The incidence of sedation was 6.7 v 14.3%. Akathisia occurred in 13.3% of pts who received droperidol. We found that intramuscular droperidol was similar in efficacy to meperidine with a low incidence of side effects.