Bouamra et al describe a modified Charlson Comorbidity Index used with the Trauma Audit and Research Network (TARN). This includes 5 additional groups, with 22 conditions, 11 of which are weighted as 0. The authors are from the University of Manchester and University of Sheffield in England.
Condition
Weights
acute myocardial infarction
4
cerebrovascular accident
1
congestive heart failure
5
dementia
4
liver disease
13
peripheral vascular disease
2
renal disease
6
cancer
3
metastatic cancer
9
blood disease
2
alcohol abuse
4
where:
• Liver disease is not separated into mild, moderate or severe.
• HIV is given 0 points.
• Other conditions awarded 0 points: diabetes, peptic ulcer, bone disease, connective tissue disorder, pulmonary disease, paraplegia, neurological disorders.
modified comorbidity index =
= SUM(points for all 11 weighted conditions)
Interpretation:
• minimum score: 0
• maximum score: 53
• The higher the score the greater the comorbidity.
Limitations:
• The weights may be relevant to trauma and short-term outcomes.
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