The number of co-morbid conditions a patients has is measured using the Charlson Co-morbidity Score, which is calculated using HES/PEDW. A co-morbidity is defined as any hospital admission with one of the following diagnoses in the last year, including the current admission:
• congestive cardiac failure
• peripheral vascular disease
• cerebrovascular disease
• rheumatological disease
• liver disease, diabetes
or any of the following diagnoses at a previous hospital admission in the last year:
• myocardial infarction
• chronic pulmonary disease
• chronic renal disease.
The patient does not need to be admitted with the co-morbidity for it to be included. The co-morbidity needs to be included in the patient notes and from there, to make its way into HES, to be included. This can be recorded in the notes at the admission for the bowel cancer resection.
See British Journal of Surgery 2010; 97: 772–781 for more details.