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PSI/TISS Ratio

Specialty:

Emergency Medicine & Critical Care
Emergency Medicine & Critical Care

Objective:

ICD-10:

Description:

The Physiologic Stability Index (PSI) measures severity of illness, while the Therapeutic Intervention Scoring System (TISS) measures quantity of care. The ratio of the two relates the level of physiologic instability to amount of therapy required. Analysis of the ratio over time can show differences not apparent by analysis of the PSI or TISS alone. The ratio can be used to evaluate pediatric intensive care units.

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