Cumulative sum control (CUSUM) charts of cumulative monthly difference between expected and seasonally adjusted observed deaths (E-O) in three specialties.

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Cumulative sum control (CUSUM) charts of cumulative monthly difference between expected and seasonally adjusted observed deaths (E-O) in three specialties (Medicine, 3A; Surgery, 3B; trauma and orthopaedic (T&O), 3C) at Queen Alexandra Hospital. Cumulative sum control (CUSUM) charts of cumulative monthly difference between expected and seasonally adjusted observed deaths (E-O) in three specialties (Medicine, 3A; Surgery, 3B; trauma and orthopaedic (T&O), 3C) at Queen Alexandra Hospital. Control limits added using the method described by Grunkemeier et al.28 ‘T’ denotes deployment of the electronic physiological surveillance system to the Acute Medicine Unit (AMU). ‘U’ denotes implementation to the first medical ward outside the AMU. ‘V’ denotes sequential hospital-wide deployment, beginning with three medical wards. ‘W’ denotes opening of new hospital wing. ‘X’ denotes deployment to the Surgical Assessment Unit. Paul E Schmidt et al. BMJ Qual Saf 2015;24:10-20 Copyright © BMJ Publishing Group Ltd and the Health Foundation. All rights reserved.