Related Experiment Videos
Management by constraints: considering patient volume when adding medical staff to the emergency department
Zeev Rotstein1, Rachel Wilf-Miron, Bruno Lavi
1Department of Medical Management, Sheba Medical Center, Tel Hashomer, Israel. zeevr@post.tau.ac.il
Insights
Adding a physician to the emergency department (ED) staff significantly reduces patient length of stay (LOS) only when patient volume is between 80-119 admissions. This highlights the importance of patient volume in optimizing ED staffing and resource allocation.
Area of Science:
- Health Services Research
- Operations Research
- Emergency Medicine
Background:
- Emergency departments (EDs) are critical hospital bottlenecks.
- Management by constraint theory suggests focusing on critical issues like physician availability.
- Staffing decisions in EDs require careful consideration of system bottlenecks.
Purpose of the Study:
- To develop a dynamic statistical model for forecasting medical staff needs in EDs.
- To optimize emergency department efficiency by considering patient volume.
- To evaluate the impact of additional physician staffing on patient flow.
Main Methods:
- Analysis of daily non-trauma admissions to a general ED from 1992-1995.
- Utilized hospital computerized database for patient data.
- Employed a Gross Linear Model with SAS software to assess physician impact on patient length of stay (LOS) across varying patient volumes.
Main Results:
- Adding a physician during evening shifts (noon to midnight) significantly reduced patient LOS by an average of 6.61 minutes for 80-119 daily admissions (P < 0.001).
- No significant effect on LOS was observed when patient admissions were below 80 or above 120.
- Physician availability as a bottleneck is volume-dependent.
Conclusions:
- Patient volume is a key determinant of the effectiveness of additional staffing in EDs.
- Applying the theory of constraints can aid in planning and coordinating emergency services.
- ED managers can use patient volume data for logical staffing and resource allocation decisions.
Background:
The emergency department is one of the hospital's busiest facilities and is frequently described as a bottleneck. Management by constraint is a managerial methodology that helps to focus on the most critical issues by identifying such bottlenecks. Based on this theory, the benefit of adding medical staff may depend on whether or not physician availability is the bottleneck in the system.
Objective:
To formulate a dynamic statistical model to forecast the need for allocating additional medical staff to improve the efficacy of work in the emergency department, taking into account patient volume.
Methods:
The daily number of non-trauma admissions to the general ED was assessed for the period 1 January 1992 to 1 December 1995 using the hospital computerized database. The marginal benefit to shortening patient length of stay in the ED by adding a physician during the evening shift was examined for different patient volumes. Data were analyzed with the SAS software package using a Gross Linear Model.
Results:
The addition of a physician to the ED staff from noon to midnight significantly shortened patient LOS: an average decrease of 6.61 minutes for 80-119 admissions (P < 0.001). However, for less than 80 or more than 120 admissions, adding a physician did not have a significant effect on LOS in the ED.
Conclusions:
The dynamic model formulated in this study shows that patient volume determines the effectiveness of investing manpower in the ED. Identifying bottleneck critical factors, as suggested by the theory of constraints, may be useful for planning and coordinating emergency services that operate under stressful and unpredictable conditions. Consideration of patient volume may also provide ED managers with a logical basis for staffing and resource allocation.