Circadian Profile of an Emergency Medicine Department: Scheduling Practices and Their Effects on Sleep and Performance

BackgroundShiftwork causes circadian disruption and is the primary reason for attrition from Emergency Medicine.ObjectivesWe aimed to develop concrete recommendations to mitigate negative effects of shiftwork based on measures of work, sleep, alertness, and performance in emergency physicians.MethodsThirty-one Emergency Medicine residents were surveyed retrospectively about sleep and alertness on different shifts. Additionally, the sleep, performance, and alertness of 22 Emergency Medicine resident and attending physicians was tracked continuously over 4 weeks via sleep logs, actigraphy, real-time reported sleepiness, and performance on a vigilance task. Schedules were analyzed for circadian disruption. Physicians also predicted their sleep schedules, which were compared with actual schedules; participants tracked extensions of shifts, schedule changes, and shifts in other hospitals.ResultsDaily rhythms were apparent in real-time performance and alertness data, with peaks at around 4 pm. Sleep difficulty was highest, sleep shortest, and alertness and performance lowest for night shifts. Emergency Medicine residents tended to cluster multiple night shifts in a row, despite evidence of accumulating sleep debt over consecutive shifts. There were many shifts that caused high circadian disruption, which could be avoided by simple amendments to scheduling practices.ConclusionsCircadian principles should be applied as suggested by the American College of Emergency Physicians. Chronotype should be considered in scheduling. Night shifts, particularly, should not be extended. Clustering all night shifts in a row should probably be discouraged. The additional vulnerabilities for night shift could be mitigated by adopting napping mid- or post night shift and by providing pay differentials.     

High prevalence of depression and sleep–wake disorders among female emergency medicine residents in South Korea

BackgroundDepression and sleep–wake disorders are recognized as one of the major problems among emergency physicians. While depression is more common in females than in males, the associated factors linking depression and sleep–wake disorders in emergency physicians, particularly females, remain unknown.ObjectiveTo analyze the prevalence of depression and sleep–wake problems among emergency medicine (EM) residents in South Korea and to identify the gender differences and situations that adversely predispose female residents to mental health problems.MethodsWe conducted a cross-sectional analysis using the data collected from the 2019 National EM Residents Wellness Survey targeting all of 630 EM residents in South Korea. The survey included variables potentially influencing depression and sleep–wake problems, such as personal characteristics, work-related stress, and extrinsic environment. Information regarding medical conditions, depression, job stress, and sleep deprivation was obtained using the self-administered Patient Health Questionnaire (PHQ-9), the Apgar Wellness Score (AWS), and the Epworth Sleepiness Scale (ESS). We analyzed the data using IBM SPSS Statistics version 25 and MedCalc version 17.ResultsA total of 384 residents participated in the survey. Overall, 27.5% of the EM residents met the criteria for at least moderate depression and 36.9% of the EM residents had sleep-related problems. We found that difficulty in trading the shift schedule and frequent night shifts was associated with depression (p = .001, p = .005; respectively). Female residents demonstrated an increased risk of depression and sleepiness compared to their male counterparts (odds ratio [OR] 1.95, OR 1.81; respectively). In addition, logistic regression analysis revealed significant differences by gender in depression with regards to flexibility of trading shifts (p = .005), level of training in the emergency medical centre (p = .035), and frequent night shifts (p = .010).ConclusionsApproximately, one-third of EM residents report depression and sleep–wake problems, with female residents showing a higher risk than male residents. Several risk factors were identified, and future strategies should be aimed to address these issues to improve the training environment and overall wellbeing of EM residents.

KEY MESSAGES

• The prevalence of depression and sleep-related problems were, respectively, 1.95 and 1.81 times higher in female residents compared to their male colleagues.
• The associated risk factors for depression were flexibility of shift trade, level of training in the emergency medical centre, and frequency of night shifts.
• Improving the training environment and facilities, as well as offering more flexible duty trading options can provide potential opportunities to reduce the risk.

     

Effect of working consecutive night shifts on sleep time,prior wakefulness,perceived levels of fatigue and performance on a psychometric test in emergency registrars

Objective: To evaluate the effect of working consecutive night shifts on sleep time, prior wakefulness, perceived levels of fatigue and psychomotor performance in a group of Australian emergency registrars. Methods: A prospective observational study with a repeated within‐subjects component was conducted. Sleep time was determined using sleep diaries and activity monitors. Subjective fatigue levels and reciprocal reaction times were evaluated before and after day and night shifts. Results: A total of 11 registrars participated in the study with 120 shifts analysed. Sleep time was found to be similar during consecutive night and day shifts. The mean number of hours spent awake before the end of a night shift was 14.33. Subjective fatigue scores were worst at the end of a night shift. There was no difference in reciprocal reaction time between the end of night shift and the start of day shift. Conclusions: Registrars sleep a similar amount of time surrounding night and day shifts. Despite reporting the highest levels of fatigue at the end of a night shift, there is no significant difference in reaction times at the end of night shift compared with the beginning of day shift. This correlates with the finding that at the end of night shift the registrars have been awake for less than 16 h, which is the point at which psychomotor performance is expected to decline.     

Night Shifts in Emergency Medicine: The American Board of Emergency Medicine Longitudinal Study of Emergency Physicians

Background

Night shift work is an integral component of the practice of emergency medicine (EM). Previous studies have demonstrated the challenges of night shift work to health and well being among health care providers.

Objective

This study was undertaken to describe the self-reported experience of emergency physicians regarding night shift work with respect to quality of life and career satisfaction.

Methods

The 2008 American Board of Emergency Medicine (ABEM) Longitudinal Study of Emergency Physicians (LSEP) was administered by mail to 1003 ABEM diplomates.

Results

Among 819 participants in the 2008 LSEP Physician Survey, most participants responded that night shift work negatively influenced job satisfaction with a moderate or major negative influence (58%; n = 467/800). Forty-three percent of participants indicated that night shifts had caused them to think about leaving EM (n = 344/809). Most participants responded that working night shifts has had mild negative effects (51%; n = 407/800) or major negative effects (9%; n = 68) on their health. Respondents were asked to describe how working night shifts has affected their health. Common themes included fatigue (36%), poor quality of sleep (35%), mood decrement/irritability (29%), and health maintenance challenges (19%). Among participants in the 2008 LSEP Retired Physician Survey, night shifts were a factor in the decision to retire for 56% of participants.

Conclusions

Emergency physicians report negative impacts of night shift work, including fatigue, poor quality of sleep, mood decrement, irritability, and health challenges. Night shifts have a negative influence on job satisfaction and can be a factor in the decision to retire.     

Characteristics of shift work and their impact on employee performance and wellbeing: A literature review

ObjectivesTo identify the characteristics of shift work that have an effect on employee's performance (including job performance, productivity, safety, quality of care delivered, errors, adverse events and client satisfaction) and wellbeing (including burnout, job satisfaction, absenteeism, intention to leave the job) in all sectors including healthcare.DesignA scoping review of the literature was undertaken.Data sourcesWe searched electronic databases (CINAHL, MEDLINE, PsychINFO, SCOPUS) to identify primary quantitative studies.Review methodsThe search was conducted between January and March 2015. Studies were drawn from all occupational sectors (i.e. health and non health), meeting the inclusion criteria: involved participants aged ≥18 who have been working shifts or serve as control group for others working shifts, exploring the association of characteristics of shift work with at least one of the selected outcomes. Reference lists from retrieved studies were checked to identify any further studies.Results35 studies were included in the review; 25 studies were performed in the health sector. A variety of shift work characteristics are associated with compromised employee's performance and wellbeing. Findings from large multicentre studies highlight that shifts of 12 h or longer are associated with jeopardised outcomes. Working more than 40 h per week is associated with adverse events, while no conclusive evidence was found regarding working a ‘Compressed Working Week’; working overtime was associated with decreased job performance. Working rotating shifts was associated with worse job performance outcomes, whilst fixed night shifts appeared to enable resynchronisation. However, job satisfaction of employees working fixed nights was reduced. Timely breaks had a positive impact on employee fatigue and alertness, whilst quick returns between shifts appeared to increase pathologic fatigue. The effect of shift work characteristics on outcomes in the studies reviewed is consistent across occupational sectors.ConclusionsThis review highlighted the complexity that encompasses shift work, but many studies do not account for this complexity. While some consistent associations emerge (e.g. 12 h shifts and jeopardised outcomes), it is not always possible to conclude that results are not confounded by unmeasured factors.     

Effects of Napping During Shift Work on Sleepiness and Performance in Emergency Medical Services Personnel and Similar Shift Workers: A Systematic Review and Meta-Analysis

Abstract

Background: Scheduled napping during work shifts may be an effective way to mitigate fatigue-related risk. This study aimed to critically review and synthesize existing literature on the impact of scheduled naps on fatigue-related outcomes for EMS personnel and similar shift worker groups. Methods: A systematic literature review was performed of the impact of a scheduled nap during shift work on EMS personnel or similar shift workers. The primary (critical) outcome of interest was EMS personnel safety. Secondary (important) outcomes were patient safety; personnel performance; acute states of fatigue, alertness, and sleepiness; indicators of sleep duration and/or quality; employee retention/turnover; indicators of long-term health; and cost to the system. Meta-analyses were performed to evaluate the impact of napping on a measure of personnel performance (the psychomotor vigilance test [PVT]) and measures of acute fatigue. Results: Of 4,660 unique records identified, 13 experimental studies were determined relevant and summarized. The effect of napping on reaction time measured at the end of shift was small and non-significant (SMD 0.12, 95% CI ?0.13 to 0.36; p = 0.34). Napping during work did not change reaction time from the beginning to the end of the shift (SMD ?0.01, 95% CI ?25.0 to 0.24; p = 0.96). Naps had a moderate, significant effect on sleepiness measured at the end of shift (SMD 0.40, 95% CI 0.09 to 0.72; p = 0.01). The difference in sleepiness from the start to the end of shift was moderate and statistically significant (SMD 0.41, 95% CI 0.09 to 0.72; p = 0.01). Conclusions: Reviewed literature indicated that scheduled naps at work improved performance and decreased fatigue in shift workers. Further research is required to identify the optimal timing and duration of scheduled naps to maximize the beneficial outcomes.     

Comparison of exogenous melatonin versus placebo on sleep efficiency in emergency medicine residents working night shifts: A randomized trial

BACKGROUND: Sleep deprivation resulting from night shifts, is a major cause of burnout among physicians. Exogenous melatonin may improve sleep quality in night-shift workers. The study aims to compare the effectiveness of melatonin versus placebo on sleep efficiency in emergency medicine (EM) residents.METHODS: A randomized, double-blind, replicated crossover trial was performed on EM residents. This study consisted of 4 phases within a month with intervention periods of 2 nights and washouts of 6 days. In our study, EM residents had nine-hour shifts on 6 consecutive days, 2 mornings, 2 evenings and 2 nights and then 2 days off. At the end of shifts’ cycle, 24 EM residents were given 3 mg melatonin or placebo (12 in each arm of the study) for 2 consecutive nights after the second night shift with crossover to the other arm after a six-day off drug. This crossover intervention was repeated for two more another time. Finally, we created 48 cases and comparisons in each arm. Different items related to sleep quality were assessed and compared both within the same group and between the two groups.RESULTS: In the melatonin group, daytime sleepiness (calculated by Karolinska Sleep Scale) had a significant reduction after taking the second dose of drug (P=0.003) but the same result was not observed when comparing the 2 groups. Mood status (calculated by Profile of Mood States) showed no remarkable difference between the 2 groups.CONCLUSION: Melatonin might have a limited benefit on sleep quality in EM residents working night shifts.     

The Occupational Risk of Motor Vehicle Collisions for Emergency Medicine Residents

OBJECTIVE: To determine the prevalence and risk factors associated with motor vehicle collisions (MVCs) and near-crashes as reported by emergency medicine (EM) residents following various ED shifts. METHODS: A survey was sent to all allopathic EM-2-EM-4 residents in May 1996 asking whether they had ever been involved in an MVC or near-crash while driving home after an ED shift. The residents' night shift schedules, self-reported tolerance of night work, ability to overcome drowsiness, sleep flexibility, and morningness/eveningness tendencies also were collected. RESULTS: Seventy-eight programs participated and 62% of 1,554 eligible residents returned usable surveys. Seventy-six (8%, 95% CI = 6% to 10%) residents reported having 96 crashes and 553 (58%, 95% CI = 55% to 61%) residents reported being involved in 1,446 near-crashes. Nearly three fourths of the MVCs and 80% of the near-crashes followed the night shift. Stepwise logistic regression of all variables demonstrated a cumulative association (R = 0.19, p = 0.0004) that accounted for 4% of the observed variability in MVCs and near-crashes. Univariate analysis showed that MVCs and near-crashes were inversely related to residents' shiftwork tolerance (p = 0.019) and positively related to the number of night shifts worked per month (p = 0.035). CONCLUSIONS: Residents reported being involved in a higher number of MVCs and near-crashes while driving home after a night shift compared with other shifts. Driving home after a night shift appears to be a significant occupational risk for EM residents.     

Emergency Medicine Residents'' Shiftwork Tolerance and Preference

OBJECTIVES: To determine the shift lengths currently worked by emergency medicine (EM) residents and their shift length preferences, and to determine factors associated with EM residents' subjective tolerance of shiftwork. METHODS: A survey was sent to EM-2 through EM-4 allopathic EM residents in May 1996. This questionnaire assessed the residents' shift length worked, shift length preferences, night shift schedules, and self-reported ability to overcome drowsiness, sleep flexibility, and morningness-eveningness tendencies. When providing shift length preferences, the residents were asked to assume a constant total number of hours scheduled per month. RESULTS: Seventy-eight programs participated, and 62% of 1,554 eligible residents returned usable surveys. Current shift lengths worked were 8 hours (12%), 10 hours (13%), 12 hours (37%), combinations of 8-hour, 10-hour, or 12-hour (34%) shifts, and other combinations (4%). Seventy-three percent of the respondents indicated that they preferred to work 8-hour or 10-hour shifts, and only 21% preferred a 12-hour shift. Shiftwork tolerance was recorded as: not well at all (2%), not very well (14%), fairly well (70%), and very well (14%). The EM residents' eveningness preference, ability to overcome drowsiness, sleep flexibility, younger age, and having no children at home were all associated with greater shiftwork tolerance. CONCLUSIONS: Emergency medicine residents generally tolerate shiftwork well and prefer 8-hour or 10-hour shift lengths compared with 12-hour shift lengths. Emergency medicine residencies with 12-hour shifts should consider changing residents' shifts to shorter shifts.     

Advocating for EMS

Abstract

Objective. Shift workers regularly report sleep problems, fatigue, and the need for recuperative rest between shifts (intershift recovery). We sought to characterize intershift recovery among emergency medical services (EMS) workers and the role of worker demographics and work-related factors. Methods. We combined cross-sectional survey data from two studies of EMS shift workers who completed standardized instruments, including the Occupational Fatigue Exhaustion Recovery (OFER) scale. A multivariable regression identified demographic and work factors most strongly associated with intershift recovery. Results. Mean intershift recovery among 450 EMS workers varied by clinical setting, general health status, length of work shift, sleep quality score, fatigue score, and daytime sleepiness. Recovery was better for EMS workers who report greater satisfaction with their schedule, higher for shift schedules >12 hours, and lowest for individuals who usually work 12-hour shifts. Conclusion. In this sample of EMS workers, greater recovery between shifts is associated with satisfaction with scheduling and longer shift length. There were weaker associations of recovery with health status, sleep quality, and workplace fatigue. Future studies should address the relationship of intershift recovery with time off between shifts, workload, and workplace safety and performance.     

Effect of Exogenous Melatonin on Mood and Sleep Efficiency in Emergency Medicine Residents Working Night Shifts

OBJECTIVE: To determine whether melatonin taken prior to attempted daytime sleep sessions will improve daytime sleep quality, nighttime sleepiness, and mood state in emergency medicine (EM) residents, changing from daytime to nighttime work schedules. METHODS: A prospective, randomized, double-blind crossover design was used in an urban emergency department. Emergency medicine residents who worked two strings of nights, of at least three nights' duration each, and separated by at least one week of days were eligible. Subjects were randomized to receive either melatonin 1 mg or placebo, 30 to 60 minutes prior to their daytime sleep session, for three consecutive days after each night shift. Crossover to the other agent occurred during their subsequent night shifts. Objective measures of quality of daytime sleep were obtained using the Actigraph 1000. This device measures sleep motion and correlates with sleep efficiency, total sleep time, time in bed, and sleep latency. The Profile of Mood States (POMS) and the Stanford Sleepiness Scale (SSS) were also used to quantify nighttime mood and sleepiness. RESULTS: Among the 19 volunteers studied, there was no difference in sleep efficiency (91.16% vs 90.98%, NS), sleep duration (379.6 min vs 342.7 min, NS), or sleep latency (7.59 min vs 6.80 min, NS), between melatonin and placebo, respectively. In addition, neither the POMS total mood disturbance (5.769 baseline vs 12.212 melatonin vs 5.585 placebo, NS) nor the SSS (1.8846 baseline vs 2.2571 melatonin vs 2.1282 placebo, NS) demonstrated a statistical difference in nighttime mood and sleepiness between melatonin and placebo. CONCLUSIONS: There are no beneficial effects of a 1-mg melatonin dose on sleep quality, alertness, or mood state during night shift work among EM residents.     

Factors affecting stress in emergency medicine residents while working in the ED

Objectives

The aim of this study was to identify factors other than work hours in the emergency department (ED) work environment contributing to resident stress.

Methods

This study involved a prospective cohort evaluation of emergency medicine residents in the ED. Twelve surveys were collected from 18 subjects, 4 each from the day, evening, and night shifts. The Perceived Stress Questionnaire and a visual analog stress scale were administered. Data collected included the shift number of a given consecutive sequence of shifts, number of procedures performed, number of adverse events, average age of the patients seen by the resident, triage nurse–assigned acuities of the patients seen by the resident during the shift, the number of patients seen during a shift, the number of patients admitted by the resident during the shift, anticipated overtime after a shift, and shift-specific metrics related to overcrowding, including average waiting room time both for the individual residents and for all patients, average waiting room count for all patients, and average occupancy of the ED for all patients.

Results

Among the 216 studied shifts, there was considerable variability in stress both within and between residents. In the multivariate mixed-effect regression analysis, only anticipated overtime and process failures were correlated with stress. Factors related to ED overcrowding had no significant effect on resident stress.

Conclusions

Resident stress was most impacted by anticipation of overtime and adverse events. Overcrowding in the ED and traditional measures of workload did not seem to affect stress as much.     

Evaluating the Effect of Emergency Residency Training on Productivity in the Emergency Department

Background

Resident productivity, defined as patients seen per unit time, is one measure that is used to assess the performance and educational progress of residents in the emergency department (ED). One published study suggested that emergency residency training (EM) does not improve productivity compared with that in other specialties, including internal medicine (IM).

Objectives

This study assesses how EM and IM trainees perform in the ED and illustrates how resident productivity changes through the academic year.

Methods

A retrospective review of attending physicians and residents working 8-h shifts in the higher acuity zone of a large-volume, tertiary, academic health care center was performed for July 2009, October 2009, January 2010, and April 2010. The total number of patients seen primarily and admitted during each shift was recorded. ED volume was approximated by the number of patients seen by the attending physician, and acuity was approximated by admission rate. A mixed model regression assessed the impact of year and type of residency training (e.g., EM1, EM2, IM1, and IM2), ED volume, and acuity on resident productivity (number of patients per shift). The study was granted waiver of informed consent by our institutional review board.

Results

We reviewed 936 shifts. After adjusting for acuity and ED volume, the EM1 group had a significant increase in patients per shift over the year, from 6.11 in July to 10.3 in April (p < 0.001). No other group increased productivity significantly.

Conclusions

The first EM training year leads to a significant change in productivity that separates EM from IM residents. This contradicts the previous assertion that non-EM residents have the same productivity as EM residents in the ED.     

Resident Service Hours in Emergency Medicine

Objective: The number of hours worked by residents in all specialties has become a controversial issue. Residents often are expected to competently conduct patient care activities and to take educational advantage of clinical experiences in spite of frequent fatigue and sleep deprivation. This survey of residency directors was designed to assess the scheduled clinical time for emergency medicine (EM) residents. Methods: A 13-question survey dealing with time commitments of EM residents was sent to the residency directors of all accredited EM residency programs in the United States in the fall of 1991. Residency directors were asked to indicate the number of shifts, hours, and days off per week; and the number of night shifts and weekend days off per month for each postgraduate year of residency training (PGY1-PGY4). Directors also were asked whether shifts were scheduled randomly or predictably with progression from days to nights with time off after nights. Results: Seventy of 71 (98.6% response rate) residency directors responded. Residents were scheduled for an average of 49.1 hours per week. Scheduled hours decreased from an average of 51.9 at the PGY1 level to an average of 44.5 at the PGY4 level. A similar progression with year of training was noted for scheduled night shifts/ month, days off/week, and weekend days off/month. A PGY1 trainee averaged 7.0 night shifts/month, 1.9 days off/week, and 3.0 weekend days off/month; while a PGY4 trainee averaged 5.3, 2.4, and 3.2, respectively. Only 40% of the directors reported predictable scheduling progressing from days to nights. Conclusion: Emergency medicine resident schedules, as reported by residency directors, fall well within current specialty-specific requirements and compare favorably with the reported numbers for other specialties. However, because large ranges in scheduling parameters were reported, the data may be of value to residency directors, residents, and prospective residents. Most programs did not report a predictable schedule progression of shifts.     

Virtual reality during work breaks to reduce fatigue of intensive unit caregivers: A crossover,pilot, randomised trial

PurposeIntensive care unit (ICU) caregivers are exposed to high levels of stress. Work-related stress can impact quality of life and may lead to burnout. Virtual reality (VR) simulates a person's presence in a pleasant and enjoyable artificial environment. Thus, VR may be used to improve breaktime efficacy during the work shift of ICU caregivers.ObjectiveThe study objectives were to evaluate the feasibility and efficacy of VR to decrease stress, anxiety, and fatigue, as well as to increase work disconnection during the breaktime.MethodsWe conducted a prospective, monocentric, open-label, crossover, randomised study comparing a half an hour breaktime including an 8-min-long VR session and a usual breaktime among ICU caregivers, on two consecutive work shifts. Participants were evaluated before and after the breaktime as well as at the end of the work shift for stress, anxiety, fatigue, and work disconnection using visual analog scales.ResultsFor the 88 participants, VR was easy to use. VR induced a significantly higher reduction in the fatigue score after the breaktime. Individual changes in the fatigue score were +0.17 (1.87) vs. −0.33 (1.87). A significantly higher feeling of disconnection from the work environment at the end of the breaktime was also observed with VR: 5.98 (3.04) vs. 4.20 (2.64). No significant difference was observed for other parameters, in particular at the end of the shift.ConclusionVR sessions could improve the efficacy of breaktimes among ICU caregivers and contribute to a better quality of work life; repeated or longer sessions may be required to induce sustained effects.     

Effects of working conditions on intravenous medication errors in a Japanese hospital

AIM: The aim of this study was to explore quantitatively which working conditions influence the occurrence of medical near-miss errors related to intravenous medication at a hospital in Japan. Background: Although working conditions such as stress, fatigue and inexperience have been reported to contribute to medical errors, countermeasures to these conditions have been delayed, and working conditions have deteriorated in many Japanese medical sites. METHODS: A self-reporting questionnaire analysing working conditions that can lead to near-miss errors relating to intravenous medication was sent to 90 nurses working in four wards of one Japanese hospital in 2001. Eighty-eight subjects responded (response rate: 97.8%). Among 534 person-days in which 88 nurses attended works, 525 person-days of data were used for the analyses. RESULTS: Among 525 person-days, the number of near-miss errors was 94 (17.9%). There was no significant difference in the occurrence of near-miss errors among the three shifts (day shift, 19.2%; evening shift, 19.2%; night shift, 12.5%). During the day shift, errors were reported at a significantly higher frequency when the nursing services were delayed longer due to workload. During the evening shift, errors were reported when the nursing services were delayed longer due to workload and when years of experience at the current ward were shorter. In addition, nurses whose perceived level of fatigue before work was lower during the day shift, and nurses whose years of experience as a nurse were longer and who had longer sleep duration during the evening shift experienced near-miss errors with a significantly higher frequency than other nurses. These latter factors could be important conditions that encourage the detection of errors before they occur. CONCLUSIONS: Workload and lack of experience at the current ward are two conditions that can lead to errors. Furthermore, lack of fatigue and long experience as a nurse may help encourage the detection of errors before they occur. It is important to improve working conditions so that health care workers can detect errors before patients are harmed and decrease the number of errors that occur.     

Patients' satisfaction with the staff function in an emergency department.

Patients' satisfaction with the functional capacity and attitude of the permanent staff working in the morning hours in the emergency department (ED) of a community hospital was compared with that of the staff working during the evening and night shifts. A total of 285 patients given care in the ED were interviewed according to a 'satisfaction' questionnaire regarding the function and attitude of the ED staff during the morning and evening/night shifts. The mean waiting time until a doctor was seen during the morning shift was 25 +/- 17 minutes for non-hospitalized patients and 25 +/- 8 minutes for the hospitalized ones, whereas during the evening and night hours the waiting times were 22 +/- 17 minutes and 19 +/- 13 minutes respectively. The number of laboratory examinations performed during the evening and night shifts markedly exceeded that carried out during the morning. The mean staying time in the ED for both non-hospitalized and hospitalized patients during the morning was by 23% shorter than that during the evening and night shifts. The patients expressed their overall satisfaction with the ED staff in both shifts with high evaluation marks. It is concluded that the survey indicates that the permanent ED staff during the morning hours are more efficient compared with those working during the evening and night shifts.