Impact of a chest-pain guideline on clinical decision-making

The junior doctor's virtual consulting room

We assessed the usability of the Virtual Consulting Room (VCR), a Web-based guidance application providing direct access to specialist knowledge. The VCR guides the user through the patient journey from first presentation to final destination. Four pre-registration house officers (PRHOs) were informed of the availability of the VCR which was accessible from all ward computers at the Royal Free Hospital. During a six-week study, 52 patients were assessed by four PRHOs. The VCR was accessed for all 52 patients. A questionnaire was completed in 49 cases (94%). In 43 of the 49 cases (88%), the PRHOs reported that the VCR supported clinical decision-making, and in 46 cases (94%) it improved their knowledge. Use of the VCR altered the PRHOs investigations in 24 cases (49%), changed the management plan in 18 cases (37%) and the decision to refer in 10 cases (20%). The present study showed that the VCR was easy to use, educational, supported clinical decision-making and affected patient management.

Comparing an Unstructured Risk Stratification to Published Guidelines in Acute Coronary Syndromes

Introduction

Guidelines are designed to encompass the needs of the majority of patients with a particular condition. The American Heart Association (AHA) in conjunction with the American College of Cardiology (ACC) and the American College of Emergency Physicians (ACEP) developed risk stratification guidelines to aid physicians with accurate and efficient diagnosis and management of patients with acute coronary syndrome (ACS). While useful in a primary care setting, in the unique environment of an emergency department (ED), the feasibility of incorporating guidelines into clinical workflow remains in question. We aim to compare emergency physicians’ (EP) clinical risk stratification ability to AHA/ACC/ACEP guidelines for ACS, and assessed each for accuracy in predicting ACS.

Methods

We conducted a prospective observational cohort study in an urban teaching hospital ED. All patients presenting to the ED with chest pain who were evaluated for ACS had two risk stratification scores assigned: one by the treating physician based on clinical evaluation and the other by the AHA/ACC/ACEP guideline aforementioned. The patient’s ACS risk stratification classified by the EP was compared to AHA/ACC/ACEP guidelines. Patients were contacted at 30 days following the index ED visit to determine all cause mortality, unscheduled hospital/ED revisits, and objective cardiac testing performed.

Results

We enrolled 641 patients presenting for evaluation by 21 different EPs. There was a difference between the physician’s clinical assessment used in the ED, and the AHA/ACC/ACEP task force guidelines. EPs were more likely to assess patients as low risk (40%), while AHA/ACC/ACEP guidelines were more likely to classify patients as intermediate (45%) or high (45%) risk. Of the 119 (19%) patients deemed high risk by EP evaluation, 38 (32%) were diagnosed with ACS. AHA/ACC/ACEP guidelines classified only 57 (9%) patients low risk with 56 (98%) of those patients diagnosed with no ACS.

Conclusion

In the ED, physicians are more efficient at correctly placing patients with underlying ACS into a high-risk category. A small percentage of patients were considered low risk when applying AHA/ACC/ACEP guidelines, which demonstrates how clinical insight is often required to make an efficient assessment of cardiac risk and established criteria may be overly conservative when applied to an acute care population.

The efficacy and safety of a chest pain protocol for short stay unit patients: A one year follow-up

BACKGROUND

The Alfred Emergency Short Stay Unit initiated a chest pain protocol for patients presenting with chest pain to risk stratify for acute coronary syndrome (ACS). A 30-day follow-up of patients discharged with low-or-intermediate risk of ACS demonstrated no deaths or ACS.

AIMS

The purpose of this study was to evaluate the long-term safety of the chest pain protocol, a one year follow-up was undertaken.

METHODS

A questionnaire was designed for the one-year follow-up and it was administered via a telephone interview by emergency nurses to document adverse cardiac events and health care utilisation.

RESULTS

From 297 patients, 224 (75%) were contacted 12 months following discharge. There was one death from stroke (0.4%; 95% confidence interval (CI): 0.01-2.5%) and another from an unknown cause. Five patients had been diagnosed with atrial fibrillation (2.2%; 95% CI: 0.7-5.1%), two patients had an acute myocardial infarction (0.9%; 95% CI: 0.03-2.1%) and four were diagnosed with angina (1.8%; 95% CI: 0.9-3.2%). Nearly half (n=103, 46%; 95% CI: 39.5-52.5%) had returned to the emergency department (ED) for various conditions including 42 patients with further chest pain. Ninety-six patients (43%; 95% CI: 39.3-52.7%) had specialist referrals and 124 investigations were performed. Thirty-four patients had cardiology referrals (15%; 95% CI: 10.7-20.5%) and 25 patients had gastroenterology referrals (11%; 95% CI: 7.3-16.0%). Diagnostic cardiac tests were performed on 38 patients: coronary angiography (n=10), 24-hour Holter monitoring (n=17), 24-hour blood pressure (BP) monitoring (n=4), thallium scans (n=5), exercise stress test (n=1) and CT scan (n=1).

CONCLUSION

Patients had a low risk of adverse events 12 months after discharge but substantial continuing health care utilization was observed. Complete assessment by health care professionals prior to discharge may help mitigate representations.

Evaluation and outcomes of patients admitted to a tertiary medical assessment unit with acute chest pain of possible coronary origin

OBJECTIVES

The study aims to (i) profile clinical characteristics, risk estimates of acute coronary syndrome (ACS), use and yield of non-invasive cardiac testing, discharge diagnosis and 30-day outcomes among patients admitted with acute chest pain of possible coronary origin; and (ii) construct a risk stratification algorithm that informs management decisions.

METHODS

This is a retrospective cohort study of 130 consecutive patients admitted to a tertiary hospital medical assessment unit between 24 January and 22 March 2012. Estimates of ACS risk were based on Australian guidelines and Thrombolysis in Myocardial Infarction (TIMI) scores.

RESULTS

Patients were of mean age 61 years, 45% had known coronary artery disease (CAD), 58% presented with typical ischaemic pain, 82% had intermediate to high ACS risk and 61% underwent testing. Myocardial ischaemia was cardiologist-confirmed discharge diagnosis in 29% of patients, and was associated with known CAD, typical pain, multiple risk factors and high TIMI risk scores (P < 0.001 for all associations). Of 98 non-invasive investigations, 9% (95% CI, 5-17%) were positive for myocardial ischaemia. Major adverse event rate at 30 days was 0.8% (95% CI, <0.1-6%). An algorithm was constructed that integrates known CAD, ACS risk and TIMI scores in identifying low-risk patients capable of rapid discharge from EDs without further investigation, and classifying the remainder into risk groups that informs choice of investigations and need for telemetry.

CONCLUSIONS

In patients with indeterminate chest pain, clinical features and risk scores identify most with myocardial ischaemia. An algorithm is presented that might inform triaging, early discharge, choice of testing and need for telemetry.

How do emergency physicians make discharge decisions?

Background

One of the most important decisions that emergency department (ED) physicians make is patient disposition (admission vs discharge).

Objectives

To determine how ED physicians perceive their discharge decisions for high-acuity patients and the impact on adverse events (adverse outcomes associated with healthcare management).

Methods

We conducted a real-time survey of staff ED physicians discharging consecutive patients from high-acuity areas of a tertiary care ED. We asked open-ended questions about rationale for discharge decisions and use of clinical judgement versus evidence. We searched for 30-day flagged outcomes (deaths, unscheduled admissions, ED or clinic visits). Three trained blinded ED physicians independently reviewed these for adverse events and preventability. We resolved disagreements by consensus. We used descriptive statistics and 95% CIs.

Results

We interviewed 88.9% (32/36) of possible ED physicians for 366 discharge decisions. Respondents were mostly male (71.9%) and experienced (53.1% >10 years). ED physicians stated they used clinical judgement in 87.6% of decisions and evidence in 12.4%. There were 69 flagged outcomes (18.8%) and 10 adverse events (2.7%, 95% CI 1.1 to 4.5%). All adverse events were preventable (1 death, 4 admissions, 5 return ED visits). No significant associations occurred between decision-making rationale and adverse events.

Conclusions

Experienced ED physicians most often relied on clinical acumen rather than evidence-based guidelines when discharging patients from ED high-acuity areas. Neither approach was associated with adverse events. In order to improve the safety of discharge decisions, further research should focus on decision support solutions and feedback interventions.

A 2-hour thrombolysis in myocardial infarction score outperforms other risk stratification tools in patients presenting with possible acute coronary syndromes: comparison of chest pain risk stratification tools

BACKGROUND

Accelerated diagnostic pathways for risk stratification of patients presenting to the emergency department with potential acute coronary syndromes may identify very-low-risk patients safe for early discharge to outpatient care.

METHODS

Patients presenting with potential acute coronary syndrome to the emergency department were prospectively enrolled between November 2007 and April 2010. Patient characteristics in conjunction with 0- and 2-hour biomarkers and electrocardiograms were analyzed according to a 2-hour thrombolysis in myocardial infarction (TIMI) score and 9 other accelerated diagnostic pathways. The primary outcome was acute coronary syndrome by 30 days.

RESULTS

Of 1,000 patients, 362 (36.2%) had a primary outcome. A pathway comprising electrocardiogram, prior ischemic heart disease, 0/2-hour troponin/creatine kinase MB fraction/myoglobin identified the highest proportion (25.0%) as low risk, with 96.1% sensitivity for the primary outcome. A pathway comprising electrocardiogram, history of ischemic heart disease, typical vs atypical symptoms, 0/2-hour troponin was the safest, with 99.7% sensitivity for the primary outcome, but only 9.0% were low risk. A pathway comprising the TIMI score with 0/2-hour troponin and electrocardiograms identified 15.5% as low risk, with a sensitivity of 99.2% for the primary outcome. This compares with standard care in which none were for outpatient care but, 3.3% had a primary outcome postdischarge within 30 days.

CONCLUSION

In this relatively high-risk population, a 2-hour TIMI score safely identified significant numbers of patients suitable for early discharge to outpatient care.

Physiological and anatomical bases for sex differences in pain and nausea as presenting symptoms of acute coronary syndromes

Acute coronary syndromes (ACS) are common in both men and women. Studies show that women have longer times before diagnosis and treatment in the Emergency Department and worse outcomes than men, which may be related to the differing symptom presentations of men and women. Men are more likely to have chest pain, whereas women are more likely to have dyspnea or nausea. However, women tend to be older and more likely to have diabetes mellitus, hypertension, and peripheral neuropathies. Men and women also exhibit differences in the neural receptors and pathways involved in pain and noxious-stimuli perception. Moreover, men and women may have subtle differences in the locations and sites of their atherosclerotic lesions, all of which may affect symptom presentation. The purposes of this review are to present: (1) the physiology of two common symptoms associated with ACS, ie, pain and nausea; (2) how these symptoms differ between men and women; and (3) how different comorbidities may affect the presentation of these symptoms.

Depression, anxiety, stress, social interaction and health-related quality of life in men and women with unexplained chest pain

Background

Unexplained chest pain (UCP) is a common reason for emergency hospital admission and generates considerable health-care costs for society. Even though prior research indicates that psychological problems and impaired quality of life are common among UCP patients, there is lack of knowledge comparing UCP patients with a reference group from the general population. The aim of this study was to analyse differences between men and women with UCP and a reference group in terms of psychosocial factors as depression, anxiety, stress, social interaction and health-related quality of life (HRQOL).

Methods

A self-administered questionnaire about psychosocial factors was completed by 127 men and 104 women with acute UCP admitted consecutively to the Emergency Department (ED) or as in-patients on a medical ward. A reference group from the general population, 490 men and 579 women, participants in the INTERGENE study and free of clinical heart disease, were selected.

Results

The UCP patients were more likely to be immigrants, have a sedentary lifestyle, report stress at work and have symptoms of depression and trait-anxiety compared with the reference group. After adjustment for differences in age, smoking, hypertension and diabetes, these factors were still significantly more common among patients with UCP. In a stepwise multivariate model with mutual adjustment for psychosocial factors, being an immigrant was associated with a more than twofold risk in both sexes. Stress at work was associated with an almost fourfold increase in risk among men, whereas there was no independent impact for women. In contrast, depression only emerged as an independent risk factor in women. Trait-anxiety and a low level of social interaction were not independently associated with risk in either men or women. Patients with UCP were two to five times more likely to have low scores for HRQOL.

Conclusion

Both men and women with UCP had higher depression scores than referents, but an independent association was only found in women. Among men, perceived stress at work emerged as the only psychosocial variable significantly associated with UCP.

Ischaemic heart disease and Australian immigrants: the influence of ethnicity and language skills on treatment and use of health services

Admission rates for ischaemic heart disease (IHD), and the use of invasive cardiovascular procedures, separation mode and length of stay (LOS) were compared between Australians from non-English speaking background (NESB; n=8627) and English speaking background (ESB; n=13162) aged 20 years and over admitted to Victorian urban public hospitals. The study covered the period from 1993 to 1998. It was found that, compared with their ESB counterparts, the incidence of admission for acute myocardial infarction was significantly higher for NESB men and women before and after controlling for confounding factors. The age-adjusted ratios for NESB women compared with their ESB counterparts ranged from 1.23 to 1.89 for cardiac catheterisation, from 0.23 to 0.27 for percutaneous transluminal coronary angioplasty (PTCA), and from 1.04 to 1.80 for coronary artery bypass grafting (CABG). Procedure rates were comparable in men for cardiac catheterisation and CABG but higher for PTA rates in NESB men (OR: 1.29, 95%CI: 1.11-1.50) than their ESB counterparts. Both NESB men (Beta=0.04, 95%CI: 0.01-0.07) and women (Beta=0.03, 95%CI: 0.02-0.08) experienced significantly longer hospital stays than their ESB counterparts. These findings indicate there may be systematic differences in patients' treatment and service utilisation in Victorian public hospitals. The extent to which physicians' bias and patients' choice could explain these differences requires further investigation.

Symptoms of men and women presenting with acute coronary syndromes

This study evaluated symptom similarities and differences between men and women presenting with acute coronary syndromes (ACSs) and determined whether differences in presentation are intrinsic to patient gender or to other factors. This study was a subgroup analysis of patients from an ACS registry. We compared differences in symptom presentation between men and women and analyzed them using binary logistic regression with all variables and 2 x 2 interactions. Patient gender was forced to remain in the models. Women comprised 35% of the 1,941 patients admitted with confirmed ACS. Men were more likely to present with chest pain, left arm pain, or diaphoresis. Nausea was more common in women. Dyspnea did not differ between groups. After binary logistic regression, gender remained a statistically significant predictor of diaphoresis and nausea, but not of chest or left arm pain. We found that differences in occurrence of chest pain and left arm pain between men and women are explainable by differences in co-morbidities and history; the higher occurrence of diaphoresis in men and of nausea in women is partly related to maleness or femaleness. In conclusion, gender should be considered when evaluating patients with symptoms of ACS.

The Accident and Emergency Department Virtual Consulting Room

The goal was to describe the development of the Virtual Consulting Room (VcR), a unique intranet-based guidance application providing direct access to local specialist knowledge, and to evaluate its usability and whether it has the potential to educate staff while working in the Accident and Emergency (A&E) department. Duty staff of the A&E Department, The Royal Free Hospital, London, participated in a prospective observational study. Two hundred and twenty consecutive patients were identified from the triage section of their casualty card as having a presenting complaint that featured in the VcR. These casualty cards were highlighted with a red sticker alert and a short questionnaire attached. Members of staff were invited to consult with the VcR after assessing each patient by clicking on an icon located on the department's computer desktops. No prior training was provided. The questionnaire was completed in 103 of 220 (46.8%) patients. The VcR was used in the management of 38 of 220 (17.3%) patients. In 21 of 38 (55.3%), users reported the VcR supported clinical decision making, in 20 of 38 (52.6%) the VcR improved knowledge and in 11 of 38 (28.9%) the VcR helped directly influence the decision to discharge the patient. In 2 of 38 (5.3%) users changed their decision to refer and in 1 of 38 (2.6%) investigations were altered. This evaluation indicates that A&E clinicians accessing the VcR found it easy to use and educational in the workplace.

Using a clinical pathway and education to reduce inappropriate prescribing of enoxaparin in patients with acute coronary syndromes: a controlled study

AIMS

To evaluate efficacy of a pathway-based quality improvement intervention on appropriate prescribing of the low molecular weight heparin, enoxaparin, in patients with varying risk categories of acute coronary syndrome (ACS).

METHODS

Rates of enoxaparin use retrospectively evaluated before and after pathway implementation at an intervention hospital were compared to concurrent control patients at a control hospital; both were community hospitals in south-east Queensland. The study population was a group of randomly selected patients (n = 439) admitted to study hospitals with a discharge diagnosis of chest pain, angina, or myocardial infarction, and stratified into high, intermediate, low-risk ACS or non-cardiac chest pain: 146 intervention patients (September-November 2003), 147 historical controls (August-December 2001) at the intervention hospital; 146 concurrent controls (September-November 2003) at the control hospital. Interventions were active implementation of a user-modified clinical pathway coupled with an iterative education programme to medical staff versus passive distribution of a similar pathway without user modification or targeted education. Outcome measures were rates of appropriate enoxaparin use in high-risk ACS patients and rates of inappropriate use in intermediate and low-risk patients.

RESULTS

Appropriate use of enoxaparin in high-risk ACS patients was above 90% in all patient groups. Inappropriate use of enoxaparin was significantly reduced as a result of pathway use in intermediate risk (9% intervention patients vs 75% historical controls vs 45% concurrent controls) and low-risk patients (9% vs 62% vs 41%; P < 0.001 for all comparisons). Pathway use was associated with a 3.5-fold (95% CI: 1.3-9.1; P = 0.012) increase in appropriate use of enoxaparin across all patient groups.

CONCLUSION

Active implementation of an acute chest pain pathway combined with continuous education reduced inappropriate use of enoxaparin in patients presenting with intermediate or low-risk ACS.

Guideline attribute and implementation preferences among physicians in multiple health systems

OBJECTIVES

Although practice guidelines are effective in assisting providers with clinical decision making, ineffective implementation strategies often prevent their use in practice. This study aimed to understand physician preferences for guideline format, placement, content, evidence, and learning strategies in different clinical environments.

SUBJECTS AND METHODS

Semistructured telephone interviews were conducted with 500 randomly selected physicians from 4 major US health systems who were involved in the treatment of patients with acute myocardial infarction or pediatric asthma. Paired sample t tests and Tukey's method of comparisons determined the relative ranking of physicians' guideline implementation preferences.

RESULTS

Physicians preferred guidelines located on the front of the patient chart, in palm pilots, or in progress notes and presented as flow charts/flow diagrams, algorithms, or preprinted orders that contain strategies to minimize readmits/encourage self-management and immediate treatment flows. Discussions with colleagues and continuing medical education are the most effective strategies for encouraging guideline use, and randomized controlled trials remain the most persuasive medical evidence.

CONCLUSIONS

Health care organizations must align guideline implementation efforts with physician preferences to encourage utilization. The results of this study reveal systematic physician preferences for guideline implementation that can be applied to clinical settings to encourage guideline use by physicians.