Miller MD, Paradis CF, Houck PR, Mazumdar S, Stack JA, Rifai AH, et al.

"Rating chronic medical illness burden in geropsychiatric practice and research:
application of the Cumulative Illness Rating Scale"

Psychiatry Res. 1992 Mar;41(3):237-48.

I➜Comorbidities are diseases or disorders that coexist with a disease of interest. Initially developed by Linn et al., the CIRS was later revised by Miller et al. to reflect common problems of the elderly. They renamed the index "Cumulative Illness Rating scale for Geriatrics", commonly abbreviated CIRS-G. This scoring system measures the chronic medical illness ("morbidity") burden while taking into consideration the severity of chronic diseases in 14 items representing individual body systems.

The general rules for severity rating are:
0→No problem affecting that system.
1→Current mild problem or past significant problem.
2→Moderate disability or morbidity and/or requires first line therapy.
3→Severe problem and/or constant and significant disability and/or hard to control chronic problems.
4→Extremely severe problem and/or immediate treatment required and/or organ failure and/or severe functional impairment.

The cumulative final score can vary theoretically vary from 0 to 56 (although a very high score is impossible).

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