ICare-ACS (Improving Care Processes for Patients With Suspected Acute Coronary Syndrome): A Study of Cross-System Implementation of a National Clinical Pathway.

BACKGROUND: Efforts to safely reduce length of stay for emergency department patients with symptoms suggestive of acute coronary syndrome (ACS) have had mixed success. Few system-wide efforts affecting multiple hospital emergency departments have ever been evaluated. We evaluated the effectiveness of a nationwide implementation of clinical pathways for potential ACS in disparate hospitals. METHODS: This was a multicenter pragmatic stepped-wedge before-and-after trial in 7 New Zealand acute care hospitals with 31 332 patients investigated for suspected ACS with serial troponin measurements. The implementation was a clinical pathway for the assessment of patients with suspected ACS that included a clinical pathway document in paper or electronic format, structured risk stratification, specified time points for electrocardiographic and serial troponin testing within 3 hours of arrival, and directions for combining risk stratification and electrocardiographic and troponin testing in an accelerated diagnostic protocol. Implementation was monitored for >4 months and compared with usual care over the preceding 6 months. The main outcome measure was the odds of discharge within 6 hours of presentation RESULTS: There were 11 529 participants in the preimplementation phase (range, 284-3465) and 19 803 in the postimplementation phase (range, 395-5039). Overall, the mean 6-hour discharge rate increased from 8.3% (range, 2.7%-37.7%) to 18.4% (6.8%-43.8%). The odds of being discharged within 6 hours increased after clinical pathway implementation. The odds ratio was 2.4 (95% confidence interval, 2.3-2.6). In patients without ACS, the median length of hospital stays decreased by 2.9 hours (95% confidence interval, 2.4-3.4). For patients discharged within 6 hours, there was no change in 30-day major adverse cardiac event rates (0.52% versus 0.44%; P=0.96). In these patients, no adverse event occurred when clinical pathways were correctly followed. CONCLUSIONS: Implementation of clinical pathways for suspected ACS reduced the length of stay and increased the proportions of patients safely discharged within 6 hours. CLINICAL TRIAL REGISTRATION: URL: https://www.anzctr.org.au/ (Australian and New Zealand Clinical Trials Registry). Unique identifier: ACTRN12617000381381.

Fecal Incontinence Is Associated With Mortality Among Older Adults With Complex Needs: An Observational Cohort Study.

OBJECTIVES: Fecal incontinence (FI) is a problem in growing older populations. Validating a suspected association between FI and mortality in community dwelling older adults could lead to improved planning for and management of the increasing complex older population. In a large cohort of New Zealand older adults, we assessed the prevalence of FI, urinary incontinence (UI), combined FI and UI, and their associations with mortality. METHODS: This study consisted of a retrospective analysis of international standardized geriatric assessment-home care (InterRAI-HC) data from community-dwelling adults aged 65 years or older, who met the criteria required for the InterRAI-HC, having complex needs and being under consideration for residential care. The prevalence of UI and FI was analyzed. Data were adjusted for demography and 25 confounding factors. Mortality was the primary outcome measure. RESULTS: The total cohort consisted of 41,932 older adults. Both UI and FI were associated with mortality (P<0.001), and risk of mortality increased with increased frequency of incontinence. In the adjusted model, FI remained significantly related to survival (P<0.001), whereas UI did not (P=0.31). Increased frequency of FI was associated with an increased likelihood of death (hazard ratio 1.28). CONCLUSIONS: This large national study is the first study to prove a statistically significant relationship between FI and mortality in a large, old and functionally impaired community. These findings will help improve the management of increasingly complex older populations.

Effectiveness of EDACS Versus ADAPT Accelerated Diagnostic Pathways for Chest Pain: A Pragmatic Randomized Controlled Trial Embedded Within Practice.

STUDY OBJECTIVE: A 2-hour accelerated diagnostic pathway based on the Thrombolysis in Myocardial Infarction score, ECG, and troponin measures (ADAPT-ADP) increased early discharge of patients with suspected acute myocardial infarction presenting to the emergency department compared with standard care (from 11% to 19.3%). Observational studies suggest that an accelerated diagnostic pathway using the Emergency Department Assessment of Chest Pain Score (EDACS-ADP) may further increase this proportion. This trial tests for the existence and size of any beneficial effect of using the EDACS-ADP in routine clinical care. METHODS: This was a pragmatic randomized controlled trial of adults with suspected acute myocardial infarction, comparing the ADAPT-ADP and the EDACS-ADP. The primary outcome was the proportion of patients discharged to outpatient care within 6 hours of attendance, without subsequent major adverse cardiac event within 30 days. RESULTS: Five hundred fifty-eight patients were recruited, 279 in each arm. Sixty-six patients (11.8%) had a major adverse cardiac event within 30 days (ADAPT-ADP 29; EDACS-ADP 37); 11.1% more patients (95% confidence interval 2.8% to 19.4%) were identified as low risk in EDACS-ADP (41.6%) than in ADAPT-ADP (30.5%). No low-risk patients had a major adverse cardiac event within 30 days (0.0% [0.0% to 1.9%]). There was no difference in the primary outcome of proportion discharged within 6 hours (EDACS-ADP 32.3%; ADAPT-ADP 34.4%; difference -2.1% [-10.3% to 6.0%], P=.65). CONCLUSION: There was no difference in the proportion of patients discharged early despite more patients being classified as low risk by the EDACS-ADP than the ADAPT-ADP. Both accelerated diagnostic pathways are effective strategies for chest pain assessment and resulted in an increased rate of early discharges compared with previously reported rates.

External validation of the emergency department assessment of chest pain score accelerated diagnostic pathway (EDACS-ADP).

OBJECTIVE: The emergency department assessment of chest pain score accelerated diagnostic pathway (EDACS-ADP) facilitates low-risk ED chest pain patients early to outpatient investigation. We aimed to validate this rule in a North American population. METHODS: We performed a retrospective validation of the EDACS-ADP using 763 chest pain patients who presented to St Paul's Hospital, Vancouver, Canada, between June 2000 and January 2003. Patients were classified as low risk if they had an EDACS <16, no new ischaemia on ECG and non-elevated serial 0-hour and 2-hour cardiac troponin concentrations. The primary outcome was the number of patients who had a predetermined major adverse cardiac event (MACE) at 30 days after presentation. RESULTS: Of the 763 patients, 317 (41.6%) were classified as low risk by the EDACS-ADP. The sensitivity, specificity, negative predictive value and positive predictive value of the EDACS-ADP for 30-day MACE were 100% (95% CI 94.2% to 100%), 46.4% (95% CI 42.6% to 50.2%), 100% (95% CI 98.5% to 100.0%) and 17.5% (95% CI 14.1% to 21.3%), respectively. CONCLUSIONS: This study validated the EDACS-ADP in a novel context and supports its safe use in a North American population. It confirms that EDACS-ADP can facilitate progression to early outpatient investigation in up to 40% of ED chest pain patients within 2 hours.

The initial health-system response to the earthquake in Christchurch, New Zealand, in February, 2011.

At 1251 h on Feb 22, 2011, an earthquake struck Christchurch, New Zealand, causing widespread destruction. The only regional acute hospital was compromised but was able to continue to provide care, supported by other hospitals and primary care facilities in the city. 6659 people were injured and 182 died in the initial 24 h. The massive peak ground accelerations, the time of the day, and the collapse of major buildings contributed to injuries, but the proximity of the hospital to the central business district, which was the most affected, and the provision of good medical care based on careful preparation helped reduce mortality and the burden of injury. Lessons learned from the health response to this earthquake include the need for emergency departments to prepare for: patients arriving by unusual means without prehospital care, manual registration and tracking of patients, patient reluctance to come into hospital buildings, complete loss of electrical power, management of the many willing helpers, alternative communication methods, control of the media, and teamwork with clear leadership. Additionally, atypical providers of acute injury care need to be integrated into response plans.

Frailty of Maori, Pasifika, and Non-Maori/Non-Pasifika Older People in New Zealand: A National Population Study of Older People Referred for Home Care Services.

BACKGROUND: Little is known about the prevalence of frailty in indigenous populations. We developed a frailty index (FI) for older New Zealand Maori and Pasifika who require publicly funded support services. METHODS: An FI was developed for New Zealand adults aged 65 and older who had an interRAI Home Care assessment between June 1, 2012 and October 30, 2015. A frailty score for each participant was calculated by summing the number of deficits recorded and dividing by the total number of possible deficits. This created a FI with a potential range from 0 to 1. Linear regression models for FIs with ethnicity were adjusted for age and sex. Cox proportional hazards models were used to assess the association between the FI and mortality for Maori, Pasifika, and non-Maori/non-Pasifika. RESULTS: Of 54 345 participants, 3096 (5.7%) identified as Maori, 1846 (3.4%) were Pasifika, and 49 415 (86.7%) identified as neither Maori nor Pasifika. New Zealand Europeans (48 178, 97.5%) constituted most of the latter group. Within each sex, the mean FIs for Maori and Pasifika were greater than the mean FIs for non-Maori and non-Pasifika, with the difference being more pronounced in women. The FI was associated with mortality (Maori subhazard ratio [SHR] 2.53, 95% CI 1.63-3.95; Pasifika SHR 6.03, 95% CI 3.06-11.90; non-Maori and non-Pasifika SHR 2.86, 95% CI 2.53-3.25). CONCLUSIONS: This study demonstrated differences in FI between the ethnicities in this select cohort. After adjustment for age and sex, increases in FI were associated with increased mortality. This suggests that FI is predictive of poor outcomes in these ethnic groups.

Predictors of Residential Care Admission in Community-Dwelling Older People With Dementia.

OBJECTIVES: The objectives of this study were to identify variables associated with dementia and entry into aged residential care (ARC) and derive and validate a risk prediction model for dementia and entry into ARC. DESIGN: This was an observational study of prospectively collected Home Care International Residential Assessment Instrument (interRAI-HC) assessment data. SETTING AND PARTICIPANTS: Participants included all people age ≥65 years who had completed an interRAI-HC assessment between July 1, 2012 and June 30, 2018. Exclusion criteria included death or entry into ARC within 30 days of assessment and not living at home at the time of the assessment. MEASURES: InterRAI data from 94,202 older New Zealanders were evaluated for presence or absence of dementia. A multivariable competing-risks model for entry into ARC with death as the competing event was used to estimate subdistribution hazard ratios (SHR). RESULTS: In total, there were 18,672 (19.8%) persons with dementia (PWD). PWD were almost twice as likely to enter ARC as persons without dementia [42.8% vs 25.3%; difference 17.5% (95% confidence interval 16.7%‒18.2%)]. PWD at highest risk of entering ARC were those where there was a desire to live elsewhere (SHR 1.44), depression (indicated, SHR 1.15), poor cognitive performance (Cognitive Performance Scale minimal SHR 1.32 and severe plus SHR 1.91), and wandering (SHR 1.19). Factors associated with reduced risks of PWD entering ARC were living with a child or relative, alcohol consumption, and comorbidities. CONCLUSIONS AND IMPLICATIONS: A desire to live elsewhere, social isolation, independent activities of daily living, and depression were independently associated with entry into ARC. Supporting caregivers may improve outcomes for PWD that delay entry into ARC. Future revisions of the interRAI questionnaire could provide more insight on this matter.

Drug Burden Index and Its Association With Hip Fracture Among Older Adults: A National Population-Based Study.

BACKGROUND: The Drug Burden Index (DBI) calculates the total sedative and anticholinergic load of prescribed medications and is associated with functional decline and hip fractures in older adults. However, it is unknown if confounding factors influence the relationship between the DBI and hip fractures. The objective of this study was to evaluate the association between the DBI and hip fractures, after correcting for mortality and multiple potential confounding factors. METHODS: A competing-risks regression analysis conducted on a prospectively recruited New Zealand community-dwelling older population who had a standardized (International Resident Assessment Instrument) assessment between September 1, 2012, and October 31, 2015, the study's end date. Outcome measures were survival status and hip fracture, with time-varying DBI exposure derived from 90-day time intervals. The multivariable competing-risks regression model was adjusted for a large number of medical comorbidities and activities of daily living. RESULTS: Among 70,553 adults assessed, 2,249 (3.2%) experienced at least one hip fracture, 20,194 (28.6%) died without experiencing a fracture, and 48,110 (68.2%) survived without a fracture. The mean follow-up time was 14.9 months (range: 1 day, 37.9 months). The overall DBI distribution was highly skewed, with median time-varying DBI exposure ranging from 0.93 (Q1 = 0.0, Q3 = 1.84) to 0.96 (Q1 = 0.0, Q3 = 1.90). DBI was significantly related to fracture incidence in unadjusted (p < .001) and adjusted (p < .001) analyses. The estimated subhazard ratio was 1.52 (95% confidence interval: 1.28-1.81) for those with DBI > 3 compared with those with DBI = 0 in the adjusted analysis. CONCLUSIONS: In this study, increasing DBI was associated with a higher likelihood of fractures after accounting for the competing risk of mortality and adjusting for confounders. The results of this unique study are important in validating the DBI as a guide for medication management and it could help reduce the risk of hip fractures in older adults.

Drug Burden and its Association with Falls Among Older Adults in New Zealand: A National Population Cross-Sectional Study.

BACKGROUND: Adverse outcomes associated with advanced diseases are often exacerbated by polypharmacy. OBJECTIVES: The current study investigated an association between exposure to anticholinergic and sedative medicines and falls in community-dwelling older people, after controlling for potential confounders. METHODS: We conducted a retrospective cross-sectional study of a continuously recruited national cohort of community-dwelling New Zealanders aged 65 years and over. Participants had an International Resident Assessment Instrument-Home Care (interRAI-HC) assessment between 1 September 2012 and 31 January 2016. InterRAI-HC is a comprehensive, multi-domain, standardised assessment. This study captured 18 variables, including fall frequency, from the interRAI. These data were deterministically matched with the Drug Burden Index (DBI) for each participant, derived from an anonymised national dispensed pharmaceuticals database. DBI groupings were statistically ascertained, and ordinal regression models employed. RESULTS: Overall, there were 71,856 participants, with a mean age of 82.7 years (range 65-106); 43,802 (61.0%) were female, and 63,578 (88.5%) were New Zealand European. In unadjusted and adjusted analyses, DBI groupings were related to falls (p < 0.001). A DBI score > 3 was associated with a 41% increase in falls compared with a DBI score of 0 (p < 0.001). There was a 'dose-response' relationship between DBI levels and falls risk. CONCLUSIONS: DBI was found to be independently and positively associated with a greater risk of falls in this cohort after adjustment for 18 known confounders. We suggest that the DBI could be a valuable tool for clinicians to use alongside electronic prescribing to help reduce falls in older people.

Impact of integrated health system changes, accelerated due to an earthquake, on emergency department attendances and acute admissions: a Bayesian change-point analysis.

OBJECTIVE: To chart emergency department (ED) attendance and acute admission following a devastating earthquake in 2011 which lead to Canterbury's rapidly accelerated integrated health system transformations. DESIGN: Interrupted time series analysis, modelling using Bayesian change-point methods, of ED attendance and acute admission rates over the 2008-2014 period. SETTING: ED department within the Canterbury District Health Board; with comparison to two other district health boards unaffected by the earthquake within New Zealand. PARTICIPANTS: Canterbury's health system services ∼500 000 people, with around 85 000 ED attendances and 37 000 acute admissions per annum. MAIN OUTCOME MEASURES: De-seasoned standardised population ED attendance and acute admission rates overall, and stratified by age and sex, compared before and after the earthquake. RESULTS: Analyses revealed five global patterns: (1) postearthquake, there was a sudden and persisting decrease in the proportion of the population attending the ED; (2) the growth rate of ED attendances per head of population did not change between the pre-earthquake and postearthquake periods; (3) postearthquake, there was a sudden and persisting decrease in the proportion of the population admitted to hospital; (4) the growth rate of hospital admissions per head of the population declined between pre-earthquake and postearthquake periods and (5) the most dramatic reduction in hospital admissions growth after the earthquake occurred among those aged 65+ years. Extrapolating from the projected and fitted deseasoned rates for December 2014, ∼676 (16.8%) of 4035 projected hospital admissions were avoided. CONCLUSIONS: While both necessarily and opportunistically accelerated, Canterbury's integrated health systems transformations have resulted in a dramatic and sustained reduction in ED attendances and acute hospital admissions. This natural intervention experiment, triggered by an earthquake, demonstrated that integrated health systems with high quality out-of-hospital care models are likely to successfully curb growth in acute hospital demand, nationally and internationally.

A Sex Disparity Among Earthquake Victims.

OBJECTIVE: Understanding who is most vulnerable during an earthquake will help health care responders prepare for future disasters. We analyzed the demography of casualties from the Christchurch earthquake in New Zealand. METHODS: The demography of the total deceased, injured, and hospitalized casualties of the Christchurch earthquake was compared with that of the greater Christchurch population, the Christchurch central business district working population, and patients who presented to the single acute emergency department on the same month and day over the prior 10 years. Sex data were compared to scene of injury, context of injury, clinical characteristics of injury, and injury severity scores. RESULTS: Significantly more females than males were injured or killed in the entire population of casualties (P20% were injured at commercial or service localities (444/2032 males [22%]; 1105/4627 females [24%]). Adults aged between 20 and 69 years (1639/2032 males [81%]; 3717/4627 females [80%]) were most frequently injured. CONCLUSION: Where people were and what they were doing at the time of the earthquake influenced their risk of injury.

Laboratory turnaround times in response to an abrupt increase in specimen testing after a natural disaster.

OBJECTIVES: Understanding how key indicators change during extreme circumstances could help laboratories maintain high standards when responding to disasters. We assessed the effects of an earthquake on turnaround times (TATs) at a hospital laboratory. METHODS: We examined TATs for 709,786 potassium tests and 196,795 urine cultures from February 2010 to January 2013. Hospital and community data were evaluated separately and compared during the transport, registration (accessioning), and analysis time phases. RESULTS: After the earthquake, the laboratory undertook approximately 70% of the nonacute community specimen testing. Initially, community transport times increased by 20 to 27 hours and remained 2 to 3 hours above prequake levels. Registration time increased by 10 to 20 minutes (hospital) and 30 to 45 minutes (community) for a short period. During the initial few months, community urine culture analysis time increased by more than 50 hours. CONCLUSIONS: The increase in specimen numbers affected short- and long-duration test TATs differently. Streamlining and automating processes reduced registration and analysis times. Increased transport time was outside the control of the laboratory.

The impact of alcohol-related presentations on a New Zealand hospital emergency department.

AIM: To determine the impact of alcohol-related presentations on the Christchurch Hospital Emergency Department (ED). METHODS: Over 42 8-hour shifts (2 weeks) between 15 November 2013 and 9 December 2013, patients attending the ED with recent alcohol consumption were classified as screen-positive (consumed alcohol in the 4 hours prior to presentation) or not. A subset of screen-positive patients was classified as impact-positive (alcohol consumption clearly contributed to the reason for presenting). Data were analysed in relation to days/shifts for gender, age, disruptive behaviour, medical reasons for presenting, and completeness of ED records. RESULTS: Of the 3619 patients screened in the study, 268 (7.4%) and 182 (5%) were screen-positive and impact-positive, respectively. Most patients attended the ED on the weekends (58%: 105/182), particularly on Saturday night (31%; 56/182). More males (118) than females (64) were impact-positive. Of the impact-positive males, most were 16-25 years old (37%; 44/118) or 41-61 years old (32%; 38/118), attended the ED on weekend night shifts (24%; 28/118), and sought treatment for non- interpersonal trauma (38%; 45/118) or interpersonal trauma due to violence (17%; 20/118). Of the female impact-positive patients, most were 16-25 years old (41%; 26/64) or 41-60 years old (33%; 21/64), and presented for deliberate self-harm (36%; 23/64) or non-interpersonal trauma (27%; 17/64). Of the 182 impact-positive patients, 86% (156) were recorded in the ED computer system. CONCLUSIONS: Alcohol-related presentations had a significant impact on the ED, particularly on weekends. Teenagers, young adults and middle-aged adults contributed to the alcohol-related patient impact on weekends. Male patients were a significant burden on Saturday evening and night shifts.

Patterns and sources of alcohol consumption preceding alcohol-affected attendances to a New Zealand hospital emergency department.

AIM: To perform a descriptive study of the drinking behaviour (amounts, types, sources of alcohol consumed) preceding alcohol-affected presentations to Christchurch Hospital Emergency Department (ED). METHODS: Over 336 hours in the ED, patients with recent alcohol consumption or alcohol-related attendances were identified, classified as alcohol-affected or alcohol- unaffected, and invited to consent to answering questions on types, amounts and sources of alcohol consumed in the drinking session preceding or implicated in their ED attendance. Demographic information and level of intoxication were also recorded. Data were summarised descriptively. RESULTS: Alcohol-affected patients were more frequently young (16-25 years) and male. Median alcohol consumption was 14 (range 1 to 71) standard drinks. Beer was the most popular beverage (34%), but spirits (23%), ready-to-drink mixes (21%) and wine (20%) were also popular. Liquor stores (45%) were the most popular source of alcohol, followed by on-licence premises (25%), and supermarkets (21%). The popularity of different types of beverages and their source varied according to patient age and gender. CONCLUSIONS: Consumption of large amounts, as well as allegedly 'safe' amounts, of a range of alcoholic beverages, most commonly from an off-licence source, contributed to alcohol-affected presentations to the ED. Beverage and source popularity varied by age and gender.

A 2-hour diagnostic protocol for possible cardiac chest pain in the emergency department: a randomized clinical trial.

IMPORTANCE: Patients with chest pain represent a high health care burden, but it may be possible to identify a patient group with a low short-term risk of adverse cardiac events who are suitable for early discharge. OBJECTIVE: To compare the effectiveness of a rapid diagnostic pathway with a standard-care diagnostic pathway for the assessment of patients with possible cardiac chest pain in a usual clinical practice setting. DESIGN, SETTING, AND PARTICIPANTS: A single-center, randomized parallel-group trial with blinded outcome assessments was conducted in an academic general and tertiary hospital. Participants included adults with acute chest pain consistent with acute coronary syndrome for whom the attending physician planned further observation and troponin testing. Patient recruitment occurred from October 11, 2010, to July 4, 2012, with a 30-day follow-up. INTERVENTIONS: An experimental pathway using an accelerated diagnostic protocol (Thrombolysis in Myocardial Infarction score, 0; electrocardiography; and 0- and 2-hour troponin tests) or a standard-care pathway (troponin test on arrival at hospital, prolonged observation, and a second troponin test 6-12 hours after onset of pain) serving as the control. MAIN OUTCOMES AND MEASURES: Discharge from the hospital within 6 hours without a major adverse cardiac event occurring within 30 days. RESULTS: Fifty-two of 270 patients in the experimental group were successfully discharged within 6 hours compared with 30 of 272 patients in the control group (19.3% vs 11.0%; odds ratio, 1.92; 95% CI, 1.18-3.13; P = .008). It required 20 hours to discharge the same proportion of patients from the control group as achieved in the experimental group within 6 hours. In the experimental group, 35 additional patients (12.9%) were classified as low risk but admitted to an inpatient ward for cardiac investigation. None of the 35 patients received a diagnosis of acute coronary syndrome after inpatient evaluation. CONCLUSIONS AND RELEVANCE: Using the accelerated diagnostic protocol in the experimental pathway almost doubled the proportion of patients with chest pain discharged early. Clinicians could discharge approximately 1 of 5 patients with chest pain to outpatient follow-up monitoring in less than 6 hours. This diagnostic strategy could be easily replicated in other centers because no extra resources are required. TRIAL REGISTRATION: anzctr.org.au Identifier: ACTRN12610000766011.

Development and validation of the Emergency Department Assessment of Chest pain Score and 2 h accelerated diagnostic protocol.

OBJECTIVE: Risk scores and accelerated diagnostic protocols can identify chest pain patients with low risk of major adverse cardiac event who could be discharged early from the ED, saving time and costs. We aimed to derive and validate a chest pain score and accelerated diagnostic protocol (ADP) that could safely increase the proportion of patients suitable for early discharge. METHODS: Logistic regression identified statistical predictors for major adverse cardiac events in a derivation cohort. Statistical coefficients were converted to whole numbers to create a score. Clinician feedback was used to improve the clinical plausibility and the usability of the final score (Emergency Department Assessment of Chest pain Score [EDACS]). EDACS was combined with electrocardiogram results and troponin results at 0 and 2 h to develop an ADP (EDACS-ADP). The score and EDACS-ADP were validated and tested for reproducibility in separate cohorts of patients. RESULTS: In the derivation (n = 1974) and validation (n = 608) cohorts, the EDACS-ADP classified 42.2% (sensitivity 99.0%, specificity 49.9%) and 51.3% (sensitivity 100.0%, specificity 59.0%) as low risk of major adverse cardiac events, respectively. The intra-class correlation coefficient for categorisation of patients as low risk was 0.87. CONCLUSION: The EDACS-ADP identified approximately half of the patients presenting to the ED with possible cardiac chest pain as having low risk of short-term major adverse cardiac events, with high sensitivity. This is a significant improvement on similar, previously reported protocols. The EDACS-ADP is reproducible and has the potential to make considerable cost reductions to health systems.

Validation of high-sensitivity troponin I in a 2-hour diagnostic strategy to assess 30-day outcomes in emergency department patients with possible acute coronary syndrome.

OBJECTIVES: The study objective was to validate a new high-sensitivity troponin I (hs-TnI) assay in a clinical protocol for assessing patients who present to the emergency department with chest pain. BACKGROUND: Protocols using sensitive troponin assays can accelerate the rule out of acute myocardial infarction in patients with low-risk (suspected) acute coronary syndrome (ACS). METHODS: This study evaluated 2 prospective cohorts of patients in the emergency department with ACS in an accelerated diagnostic pathway integrating 0- and 2-h hs-TnI results, Thrombolysis In Myocardial Infarction (TIMI) risk scores, and electrocardiography. Strategies to identify low-risk patients incorporated TIMI risk scores= 0 or ≤ 1. The primary endpoint was a major adverse cardiac event (MACE) within 30 days. RESULTS: In the primary cohort, 1,635 patients were recruited and had 30-day follow-up. A total of 247 patients (15.1%) had a MACE. The finding of no ischemic electrocardiogram and hs-TnI ≤ 26.2 ng/l with the TIMI = 0 and TIMI ≤ 1 pathways, respectively, classified 19.6% (n = 320) and 41.5% (n = 678) of these patients as low risk; 0% (n = 0) and 0.8% (n = 2) had a MACE, respectively. In the secondary cohort, 909 patients were recruited. A total of 156 patients (17.2%) had a MACE. The TIMI = 0 and TIMI ≤ 1 pathways classified 25.3% (n = 230) and 38.6% (n = 351), respectively, of these patients as low risk; 0% (n = 0) and 0.8% (n = 1) had a MACE, respectively. Sensitivity, specificity, and negative predictive value for TIMI = 0 in the primary cohort were 100% (95% confidence interval [CI]: 98.5% to 100%), 23.1% (95% CI: 20.9% to 25.3%), and 100% (95% CI: 98.8% to 100%), respectively. Sensitivity, specificity, and negative predictive value for TIMI ≤ 1 in the primary cohort were 99.2 (95% CI: 97.1 to 99.8), 48.7 (95% CI: 46.1 to 51.3), and 99.7 (95% CI: 98.9 to 99.9), respectively. Sensitivity, specificity, and negative value for TIMI ≤ 1 in the secondary cohort were 99.4% (95% CI: 96.5 to 100), 46.5% (95% CI: 42.9 to 50.1), and 99.7% (95% CI: 98.4 to 100), respectively. CONCLUSIONS: An early-discharge strategy using an hs-TnI assay and TIMI score ≤ 1 had similar safety as previously reported, with the potential to decrease the observation periods and admissions for approximately 40% of patients with suspected ACS. (Advantageous Predictors of Acute Coronary Syndromes Evaluation [APACE] Study, NCT00470587; A 2 hr Accelerated Diagnostic Protocol to Assess patients with chest Pain symptoms using contemporary Troponins as the only biomarker [ADAPT]: a prospective observational validation study, ACTRN12611001069943).