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Background: COVID-19 and seasonal influenza are endemic causes of morbidity and mortality. This study aimed to compare the epidemiology of severe illness and risk of death among patients following emergency department (ED) presentation with either infection., Methods: De-identified, population-based, emergency department records in New South Wales, Australia, were probabilistically linked to population-level health outcome databases for the period 1 January 2015 to 28 February 2023. Included were patients allocated an ED diagnosis consistent with an acute respiratory infection. Logistic regression was used to examine the association of infecting virus with risk of a severe outcome (intensive care unit admission or death)., Results: Influenza infection was notified in 2335 and COVID-19 in 5053 patients with a severe outcome. The age distribution was similar for both viruses, except in <15-year-olds, where severe influenza was nearly three times more frequent. Overall, the odds of death among patients with COVID-19 was 1.65 (95% CI 1.43, 1.89) times higher than among those with influenza. This declined to 1.49 (95% CI 1.08, 2.06) times during the COVID-19 Omicron variant period., Conclusions: The Omicron variant arrived when background population COVID-19 vaccination coverage was >90%. Despite that, death was more frequent for COVID-19 than influenza., Competing Interests: Declaration of Competing Interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2024 The Author(s). Published by Elsevier Ltd.. All rights reserved.)

ED crowding has been reported to reduce the quality of care. There are many proposed crowding metrics, but the metric most strongly associated with care quality remains unknown. The present study aims to determine the crowding metric with the strongest links with processes and outcomes of care linked to the Institute of Medicine quality domains. Systematic searches in healthcare databases were conducted using terms for 'crowding', 'metrics' and 'performance', supplemented by grey literature and citation searches. The level of evidence for each association was assessed using an explicit tool. The body of evidence was assessed using the Grading of Recommendations Assessment, Development and Evaluation approach. Evidence was synthesised using harvest plots. Titles and abstracts of 2052 studies were screened, 452 selected for full-text review and 183 included. Inter-observer agreement was moderate κ = 0.54 (95% confidence interval 0.50-0.59). Two thirds were from urban tertiary hospitals in North America (65%), Australasia (13%), Europe (12%) and Asia (8%). One third provided Level 3 or higher evidence. Metrics were based on occupancy (38%), time (31%), workload (19%) or combinations (9%). Data were synthesised from 25 607 375 patients, 2368 staff, 9089 hospitals and 101 177 sampling times. Almost all crowding metrics were patient-centred and reflect timeliness and efficiency. ED length of stay, boarding time and total occupancy had the strongest association with safety and effectiveness of care. ED length of stay was also associated with equity. The certainty of evidence for associations between crowding measures varied across domains of quality, from very low to moderate certainty., (© 2021 Australasian College for Emergency Medicine.)

Time-based targets for ED length of stay were introduced in England in 2000, followed by the rest of the UK, Canada, Ireland, New Zealand, and Australia after ED crowding was associated with poor quality of care and increased mortality. This systematic review evaluates qualitative literature to see if ED time-based targets have influenced patient care quality. We included 13 studies from four countries, incorporating 617 interviews. We conclude that time-based targets have impacted on the quality of emergency patient care, both positively and negatively. Successful implementation depends on whole hospital resourcing and engagement with targets., (© 2021 Australasian College for Emergency Medicine.)

Introduction: Delayed handover of emergency medical services (EMS) patients to EDs is a major issue with hospital crowding considered a primary cause. We explore the impact of the 4-hour rule (the Policy) in Australia, focusing on ambulance and ED delays., Methods: EMS (ambulance), ED and hospital data of adult patients presenting to 14 EDs from 2002 to 2013 in three jurisdictions were linked. Interrupted time series 'Before-and-After' trend analysis was used for assessing the Policy's impact. Random effects meta-regression analysis was examined for associations between ambulance delays and Policy-associated ED intake, throughput and output changes., Results: Before the Policy, the proportion of ED ambulances delayed increased between 1.1% and 1.7% per quarter across jurisdictions. After Policy introduction, Western Australia's increasing trend continued but Queensland decreased by 5.1% per quarter. In New South Wales, ambulance delay decreased 7.1% in the first quarter after Policy introduction. ED intake (triage delay) improved only in New South Wales and Queensland. Each 1% ambulance delay reduction was significantly associated with a 0.91% reduction in triage delay (p=0.014) but not ED length of stay ≤4 hours (p=0.307) or access-block/boarding (p=0.605) suggesting only partial improvement in ambulance delay overall., Conclusion: The Policy was associated with reduced ambulance delays over time in Queensland and only the immediate period in New South Wales. Associations may be due to local jurisdictional initiatives to improve ambulance performance. Strategies to alleviate ambulance delay may need to focus on the ED intake component. These should be re-examined with longer periods of post-Policy data., Competing Interests: Competing interests: Professor Gerry Fitzgerald is Member of the Editorial Board., (© Author(s) (or their employer(s)) 2020. No commercial re-use. See rights and permissions. Published by BMJ.)

Objective: To explore the impact of the Four-Hour Rule/National Emergency Access Target (4HR/NEAT) on staff and ED performance., Methods: A mixed-methods study design was used to link performance data from 16 participating hospitals with the experiences reported by 119 ED staff during policy implementation. Quantitative and qualitative measures were triangulated to identify the staff and organisational effects on hospital performance. An overall score was developed to categorise hospitals into: high, moderate and low performers, then compared with four qualitative themes: social factors, ED management, ED outcomes and 4HR/NEAT compliance., Results: Key factors identified were stress and morale; intergroup dynamics; interaction with patients; resource management; education and training; financial incentives; impact on quality and safety; perceived improvements on access block and overcrowding. High performing hospitals reported increased stress and decreased morale, decreased staff-patient communication and staff shortages; significant changes in ED management and effective use of the whole-of-hospital approach. Moderate performing hospitals reported similar characteristics to a lesser degree, and the perception that 4HR/NEAT did not impact ED practice. Low performing hospitals also reported increased stress and low morale and a less effective whole-of-hospital approach. ED staff also reported a reduction in communication with patients., Conclusions: There was strong evidence of an association between high stress and low morale and the implementation of the 4HR/NEAT across all levels of performance. These adverse consequences of the 4HR/NEAT implementation indicate that a more nuanced approach to efficiency improvements is required. This would balance processes measured by 4HR/NEAT against a range of other clinical and organisational performance measures., (© 2019 Australasian College for Emergency Medicine.)

Objective: To evaluate potential gaming of the 4 h ED length of stay metric known as the National Emergency Access Target (NEAT) in Australia and Emergency Treatment Performance (ETP) in New South Wales (NSW)., Methods: Descriptive statistical analysis was used to recalculate and compare the scores for NEAT and the NSW ETP using variations in the definitions of their measurement on 32 184 presentations during 2016. A computer simulation using a discrete event model illustrated the effect of the use of ED short stay beds on the ETP scores., Results: Using the timestamp of the intent to discharge a patient, called, 'ready for departure' instead of the time of a patient physically leaving the department, resulted in an apparent 6% performance improvement. A local interpretation of the NSW state definition of the 'transferred' patient resulted in the ETP for 'admitted' patients improving by 16%. The discrete event model demonstrated that without changing patient length of stay, ETP scores can be improved by optimising the time of the admit decision or increasing the number of ED short stay beds., Conclusions: The opportunity of NEAT may be squandered unless gaming of the definitions and use of ED short stay beds is addressed. We argue that the longstanding issue of 'departure time' should be defined as 'physically leaving' the department, in accordance with the Australasian College for Emergency Medicine (ACEM) definition. Patient occupancy is a real measure of ED resource use and NSW and national recommendations should be adjusted. ACEM accreditation of EDs should include review of their application of NEAT definitions to ensure they truly reflect patient flow processes., (© 2019 Australasian College for Emergency Medicine.)

Objective: It has been 10 years since the ACEM Access Block Solutions Summit and 5 years since the introduction of the Four-Hour Rule/National Emergency Access Target (4HR/NEAT) policy. The impact of this policy on ED management and on ED staff has been poorly understood. The aim of the present study was to identify changes in ED management resulting from the policy based on ED staff experiences., Methods: Semi-structured interviews were conducted and transcribed, imported to NVivo 11 and analysed using a combination of content, thematic analysis and phenomenological focus within a theoretical framework known as the 'logic model'., Results: One hundred and nineteen ED staff participated in 2015-2016 to assess the impact of the policy implementation. Participants were drawn from 16 EDs in New South Wales, Queensland, Western Australia and Australian Capital Territory. In relation to ED management, three themes were identified: changes in ED management; activities and changes driven by the hospital in relation to 4HR/NEAT; and participant experiences in relation to policy compliance by staff., Conclusions: Policy implementation is a complex process that had both positive and negative consequences on how ED staff managed the implementation of the 4HR/NEAT policy and how it changed their work environment. Understanding the perceptions of staff involved in policy implementation has significance for the design of future implementation strategies. The biggest insight from the present study is that ED management is very complex and the policy generated multiple positive and negative changes demonstrating the wide range of processes involved in this area of health services research., (© 2018 Australasian College for Emergency Medicine and Australasian Society for Emergency Medicine.)

Objective: The implementation of the time target policy (Four-Hour Rule/National Emergency Access Target [4HR/NEAT]) constituted a major change for ED, and potentially on quality of care. The present study aimed to understand perceptions and experiences of ED staff during 4HR/NEAT implementation., Methods: A semi-structured interview was used to explore views and perceptions of 119 ED staff from 16 EDs in New South Wales, Australian Capital Territory, Queensland and Western Australia. The interviews covered aspects such as perceived changes in quality of clinical care, whether the capacity to deliver education was diminished or enhanced and whether the policy affected access to care. Interviews were transcribed, imported to NVivo 11 and analysed using content and thematic analysis., Results: Three themes were identified: quality and safety of care; access block and overcrowding; and medical education and training. Participants described both positive and negative aspects of the policy. Although some reported negative impacts on care quality and access block, more cited overall improvements in these areas. The majority perceived that medical education and training was negatively affected, mainly because of restricted training opportunities and reduced time for procedural skills., Conclusions: ED staff perceived important effects on quality and safety of care; access block and overcrowding; and medical education and training. In relation to an optimised ED role, quality of care and access block were overall felt to be improved, while education and training deteriorated. Our study increases understanding of the complexity of policy implementation processes and its impact on staff. Staff perceptions are a valuable measure of system performance and should be incorporated into system change evaluations., (© 2018 Australasian College for Emergency Medicine and Australasian Society for Emergency Medicine.)

Objective: To evaluate the impact of the Australian National Emergency Access Target (NEAT) policy introduced in 2012 on ED performance., Methods: A longitudinal cohort study of NEAT implementation using linked data, for 12 EDs across New South Wales (NSW), Australian Capital Territory (ACT) and Queensland (QLD) between 2008 and 2013. Segmented regression in a multi-level model was used to analyse ED performance over time before and after NEAT introduction. The main outcomes measures were ED length of stay ≤4 h, access block, number of ED presentations, short-stay admission (≤24 h), >24 h admissions, unplanned ED re-attendances within 7 days and 'left at own risk' (including 'did not wait for assessment')., Results: Two years after NEAT introduction, ED length of stay ≤4 h increased in NSW and QLD (odds ratio [OR] = 2.48 and 3.24; P < 0.001) and access block decreased (OR = 0.41 and 0.22; P < 0.001), but not in ACT (OR = 1.28; P > 0.05). ED presentations increased over time before and after NEAT introduction with a significant increase above the projected trend in NSW after NEAT (mean ratio = 1.07). Short-stay admissions increased in QLD (OR = 2.60), ACT (OR = 1.68) and NSW (OR = 1.35). Unplanned ED re-attendances did not change significantly. Those who left at their own risk decreased significantly in NSW and QLD (OR = 0.38 and 0.67)., Conclusion: ED presentations continued to increase over time in all jurisdictions. NSW and QLD, but not ACT, showed significant improvements in time-based measures. Significant increases in short-stay admissions suggest a strategic change in ED process associated with NEAT implementation. Rates of unplanned ED re-attendances and those leaving at their own risk showed no evidence for adverse effects from NEAT., (© 2018 Australasian College for Emergency Medicine and Australasian Society for Emergency Medicine.)

Background: The Four-Hour Rule or National Emergency Access Target policy (4HR/NEAT) was implemented by Australian State and Federal Governments between 2009 and 2014 to address increased demand, overcrowding and access block (boarding) in Emergency Departments (EDs). This qualitative study aimed to assess the impact of 4HR/NEAT on ED staff attitudes and perceptions. This article is part of a series of manuscripts reporting the results of this project., Methods: The methodology has been published in this journal. As discussed in the methods paper, we interviewed 119 participants from 16 EDs across New South Wales (NSW), Queensland (QLD), Western Australia (WA) and the Australian Capital Territory (ACT), in 2015-2016. Interviews were recorded, transcribed, imported to NVivo 11 and analysed using content and thematic analysis., Results: Three key themes emerged: Stress and morale, Intergroup dynamics, and Interaction with patients. These provided insight into the psycho-social dimensions and organisational structure of EDs at the individual, peer-to-peer, inter-departmental, and staff-patient levels., Conclusion: Findings provide information on the social interactions associated with the introduction of the 4HR/NEAT policy and the intended and unintended consequences of its implementation across Australia. These themes allowed us to develop several hypotheses about the driving forces behind the social impact of this policy on ED staff and will allow for development of interventions that are rooted in the rich context of the staff's experiences.

Background: To investigate the impact of presenting to an Emergency Department (ED) during pregnancy on postnatal depression (PND) in women in New South Wales (NSW), Australia., Method: An epidemiological population-based study using linked data from the NSW Emergency Department Data Collection (EDDC), the NSW Perinatal Data Collection (PDC) and the NSW Admitted Patients Data Collection (APDC) was conducted. Women who gave birth to their first child in NSW between 1 January 2006 and 31 December 2010 were followed up from pregnancy to the end of the first year after birth., Results: The study population includes 154,328 women who gave birth to their first child in NSW between 2006 and 2010. Of these, 31,764 women (20.58%) presented to ED during pregnancy (95%CI = 20.38-20.78). Women who presented to ED during pregnancy were more likely to be admitted to hospital for the diagnosis of unipolar depression (the adjusted relative risk (RR) =1.86, 95%CI = 1.49-2.31) and the diagnosis of mild mental and behavioural disorders associated with the puerperium (the adjusted RR = 1.55, 95%CI = 1.29-1.87) than those without ED presentation., Conclusion: Women's hospital admissions for postnatal depression were associated with frequent ED presentations during pregnancy.

Emergency department (ED) overcrowding reduces efficiency and increases the risk of medical error leading to adverse events. Technical solutions and models have done little to redress this. A full year's worth of ethnographic observations of patient flow were undertaken, which involved making hand-written field-notes of the communication and activities of emergency clinicians (doctors and nurses), in two EDs in Sydney, Australia. Observations were complemented by semi-structured interviews. We applied thematic analysis to account for the verbal communication and activity of emergency clinicians in moving patients through the ED. The theoretical model that emerged from the data analysis is the ED "carousel". Emergency clinicians co-construct a moving carousel which we conceptualise visually, and which accounts for the collective agency of ED staff, identified in the findings. The carousel model uniquely integrates diagnosis, treatment and transfer of individual patients with the intellectual labour of leading and coordinating the department. The latter involves managing staff skill mix and the allocation of patients to particular ED sub-departments. The model extends traditional patient flow representations and underlines the importance of valuing ethnographic methods in health services research, in order to foster organisational learning, and generate creative practical and policy alternatives that may, for example, reduce or ameliorate access block and ED overcrowding., (Copyright © 2013 Elsevier Ltd. All rights reserved.)

Objectives: In this hypothesis-generating study, we observe, identify, and analyze how emergency clinicians seek to manage work pressure to maximize patient flow in an environment characterized by delayed patient admissions (access block) and emergency department (ED) crowding., Methods: An ethnographic approach was used, which involved direct observation of on-the-ground behaviors, when and where they happened. More than 1,600 hours over a 12-month period were spent observing approximately 4,500 interactions across approximately 260 emergency physicians and nurses, emergency clinicians, and clinicians from other hospital departments. The authors content analyzed and thematically analyzed more than 800 pages of field notes to identify indicators of and responses to pressure in the day-to-day ED work environment., Results: In response to the inability to control inflow, and the reactions of inpatient departments to whom patients might be transferred, emergency clinicians: reconciled urgency and acuity of conditions; negotiated and determined patients' admission-discharge status early in their trajectories; pursued predetermined but coevolving pathways in response to micro- and macroflow problems; and exercised flexibility to reduce work pressure by managing scarce time and space in the ED., Conclusions: To redress the linearity of most literature on patient flow, this study adopts a systems perspective and ethnographic methods to bring to light the dynamic role that individuals play, interacting with their work contexts, to maintain patient flow. The study provides an empirical foundation, uniquely discernible through qualitative research, about aspects of ED work that previously have been the subject only of discussion or commentary articles. This study provides empirical documentation of the moment-to-moment responses of emergency clinicians to work pressure brought about by factors outside much of their control, establishing the relationship between patient flow and work pressure. We conceptualize the ED as a dynamic system, combining socioprofessional influences to reduce and control work pressure in the ED. Interventions in education, practice, policy, and organizational performance evaluations will be supported by this systematic documentation of the complexity of emergency clinical work. Future research involves testing the five findings using systems dynamic modeling techniques., (© 2011 by the Society for Academic Emergency Medicine.)

Social scientific and nursing studies, and the experiences of emergency department staff, have attested to the complex organisational and communicative work that accompanies emergency clinical work. Yet, little attention has been paid to developing a research framework to examine and develop communicative and organisational work in emergency departments (EDs). This paper explores the role of nurses in plugging gaps in the care of ED patients, and summarises the findings of a large, 3-year ethnographic study comprising 12 months of ethnography in two EDs in Sydney, Australia, and 2 years of analysis. The findings of the large study are summarised and exemplified here as part of a broader conceptual argument for the importance of ethnographic research in EDs. Ethnography involves capturing the moment-to-moment action of life when and where it happens, and in the context of, reflecting and amending, broader social patterns. The findings report on the relationship of communication, organisational and, in particular, interdepartmental and interorganizational work, to emergency clinical work and demonstrate that nurses play an important role in articulating and reconciling patients' and medical staff activities. The paper concludes that emergency nurses are well placed to use ethnographic research to advance the understanding and delivery of emergency care., (Crown Copyright © 2010. Published by Elsevier Ltd. All rights reserved.)

Emergency clinicians undertake boundary-work as they facilitate patient trajectories through the Emergency Department (ED). Emergency clinicians must manage the constantly-changing dynamics at the boundaries of the ED and other hospital departments and organizations whose services emergency clinicians seek to integrate. Integrating the care that differing clinical groups provide, the services EDs offer, and patients' needs across this journey is challenging. The journey is usually accounted for in a linear way - as a "continuity of care" problem. In this paper, we instead conceptualize integrated care in the ED using a complex adaptive systems (CAS) perspective. A CAS perspective accounts for the degree to which other departments and units outside of the ED are integrated, and appropriately described, using CAS concepts and language. One year of ethnographic research was conducted, combining observation and semi-structured interviews, in the EDs of two tertiary referral hospitals in Sydney, Australia. We found the CAS approach to be salient to analyzing integrated care in the ED because the processes of categorization, diagnosis and discharge are primarily about the linkages between services, and the communication and negotiation required to enact those linkages, however imperfectly they occur in practice. Emergency clinicians rapidly process large numbers of high-need patients, in a relatively efficient system of care inadequately explained by linear models. A CAS perspective exposes integrated care as management of the patient trajectory within porous, shifting and negotiable boundaries., (Copyright © 2010 Elsevier Ltd. All rights reserved.)

Prospective and retrospective access block hospital intervention studies from 1998 to 2008 were reviewed to assess the evidence for interventions around access block and ED overcrowding, including over 220 documents reported in Medline and data extracted from The State of our Public Hospitals Reports. There is an estimated 20-30% increased mortality rate due to access block and ED overcrowding. The main causes are major increases in hospital admissions and ED presentations, with almost no increase in the capacity of hospitals to meet this demand. The rate of available beds in Australia reduced from 2.6 beds per 1000 (1998-1999) to 2.4 beds per 1000 (2002-2007) in 2002, and has remained steady at between 2.5-2.6 beds per 1000. In the same period, the number of ED visits increased over 77% from 3.8 million to 6.74 million. Similarly, the number of public hospital admissions increased at an average rate of 3.4% per year from 3.7 to 4.7 million. Compared with 1998-1999 rates, the number of available beds in 2006-2007 is thus similar (2.65 vs 2.6 beds per 1000), but the number of ED presentations has almost doubled. All patient groups are affected by access block. Access block interventions may temporarily reduce some of the symptoms of access block, but many measures are not sustainable. The root cause of the problem will remain unless hospital capacity is addressed in an integrated approach at both national and state levels.

Objective: To explore language service provision in a pilot hospital study with two methods of data collection., Methods: This mixed mode study design comprises a multilingual telephone survey followed by a medical records audit, undertaken at Liverpool Hospital in 2004-05., Results: Two hundred and fifty-eight patients responded from 360 patients representing nine language groups. About a third of patients with limited English proficiency had used a professional interpreter in hospital. Concordance between the multilingual telephone survey and the medical records audit was apparent, although the telephone survey mostly showed non-significant, higher rates than the audit. While the methods showed high agreement (76%) for frequency of interpreter usage, kappa indicated only fair agreement (PABAK 0.40). Forty-eight percent of the patients preferred relatives as interpreters and 51% felt that their inability to speak English negatively affected their hospital stay., Conclusions: Professional interpreter usage is lower than desirable in the hospital, especially in the Emergency Department. Relatives frequently interpret. Under-reporting on the medical record is suggested, implying a need for improved documentation, while possible over-reporting in the telephone survey may relate to recall bias and social acquiescence.

Objective: To explore the association of morphine use with factors influencing time to initial analgesia (T-A)., Methods: A retrospective cohort review was conducted. Morphine data were collected from a register for restricted drugs located in the ED. T-A was the time interval between triage and signing out of morphine's first dose. Statistical analyses were performed to determine the association between morphine use and patient volume., Results: In total, 8% of ED attendees received at least one dose of morphine sulphate in the ED. Prevalence of morphine use significantly (P < 0.05) varied by patient's age, Australasian Triage Scale category, time of arrival and type of illness. The median time of T-A was 79 min (95% CI 71-85) with substantially longer (median 107 min) for those who arrived during the afternoon and triaged as less urgent (median 127 min). Patients who arrived late at night (median 47 min), triaged as immediately/imminently life-threatening (median 58 min) and diagnosed as renal colic (median 27 min) or fractures/injuries (median 67 min) were more likely to receive i.v. morphine faster than other patients. The findings confirmed that large volume of patients in ED was associated with longer T-A. Patient volume in the ED showed a significant positive association with T-A (r = 0.568, 32% variation explained, P < 0.01)., Conclusion: T-A is an important indicator of the quality of ED services. Severity of illness and patient volume were significant factors associated with extended T-A. Strategies for improving pain management in the complex ED environment are discussed.

Objectives: To describe the population of emergency department patients who leave without being seen by a medical officer, to investigate the circumstances of their visit and to ascertain whether they subsequently receive alternative medical care., Methods: A follow-up study was conducted of patients who were initially triaged, but left without being seen by a medical officer between July 2003 and October 2003 in a tertiary referral hospital emergency department in Sydney, Australia. Emergency Department Information System data were reviewed for population demographics, presenting complaints and acuity rating of patients. Follow-up telephone interviews were conducted within 7 days after the patient left the emergency department., Results: During the study period, 8.6% (1272 of 14 741) of the emergency department patients left without seeing a doctor and 35.9% (457 of 1272) of these patients who walks out were contacted for follow-up. The results from bivariate and multivariate analyses showed that walkout rates significantly varied by sociodemographic and clinical characteristics of the patients. Young patients aged 0-29 years, and those with longer waiting time for triage and triaged as "less urgent" were more likely to walk out than others. Overcrowding in the emergency department had a significant association with walkout of patients. Prolonged waiting time was the most common reason for leaving emergency departments without being seen by a doctor. Only 12.7% (58 of 457) of the walkout patients revisited emergency departments within 7 days of their departure and of those who were subsequently admitted following their return to hospital accounted for 5.0% (23 of 457). Of the follow-up patients, 39.4% felt angry about their emergency department experiences., Conclusions: The number of patients who leave an emergency department without seeing a doctor is strongly correlated with waiting time for medical review. Achieving shorter emergency department waiting times is central to reducing the numbers of people leaving without being seen. The rate of patients who leave without being seen is also strongly correlated with triage category. These findings highlight the importance of accurate triaging, as this clearly influences waiting time. It is also likely that there are patients who benefit from the reassurance of the triage assessment, and therefore feel less urgency for medical review. These may be cases where immediate medical review is not essential. This area should be further explored. These results are important for planning and staffing health services. Decision makers should identify and target factors to minimise walkouts from public hospital emergency departments.

Objectives: To estimate the magnitude of access block and its trend over time in New South Wales hospitals, using different definitions of access block, and to explore its association with clinical and non-clinical factors., Design and Setting: An epidemiological study using the Emergency Department Information System datasets (1 January 1999 to 31 December 2001) from a sample of 55 NSW hospitals., Main Outcome Measures: Prevalence of access block measured by four different definitions; strength of association between access block, type of hospital, year of presentation, mode and time of arrival, triage category (an indicator of urgency), age and sex., Results: Rates of access block (for all four definitions) increased between 1999 and 2001 by 1%-2% per year. There were increases across all regions of NSW, but urban regions in particular. Patients presenting to Principal Referral hospitals and those who arrived at night were more likely to experience access block. After adjusting for triage category and year of presentation, the mode of arrival, time of arrival, type of hospital, age and sex were significantly associated with access block., Conclusions: Access block continues to increase across NSW, whatever the definition used. We recommend that hospitals in NSW and Australia move to the use of one standard definition of access block, as our study suggests there is no significant additional information emerging from the use of multiple definitions.

Rates of patients attending for primary care reasons at the emergency department of Campbelltown Hospital were estimated to identify trends in utilisation, reasons for attendance and social characteristics. The proportion of 'primary care' patients attending the emergency department is increasing. The reasons for the increase are not known and require further investigation.