Publication Date


Document Type


First Advisor

Chen, Gary||Nguyen, Christine||Damodaran, Purushothaman

Degree Name

B.S. (Bachelor of Science)

Legacy Department

Department of Industrial and Systems Engineering


This paper covers the background, methods, and results of the Environmental Services (EVS) Throughput Improvement project at Northwestern Medicine’s Kishwaukee Hospital. Patient throughput at hospitals is closely related to the experience of its patients. At Kishwaukee hospital, increased demand for inpatient services resulted in high occupancy rates and thereby undesirable patient throughput patterns. The project addresses patient throughput related problems at the hospital by seeking to improve the EVS bed turnaround process. This process is defined as the time from when the EVS system is notified that a bed is ready for turnaround, to the time that the room is prepared for the next patient. The primary objective of the project is to reduce the cycle time of the process. The project considers improvements to the scheduling, communication, and standardization of this process by delivering data supported process improvements, industry best practices, and tools for improved communication and feedback. The project succeeds in sustainably reducing the cycle time for the bed turnaround process. Additionally, the project analyzes the effects of factors related to patient throughput using an ARENA discrete event simulation model. The factors analyzed are the bed turnaround time, the patient discharge time, and the number of hospital beds.

Leena Ghrayeb 2020 .pdf (2509 kB)
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51 pages




Northern Illinois University

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