Medical Diagnostics & Clinical Scoring

SAPS II (Simplified Acute Physiology Score)

Calculate the SAPS II score to predict hospital mortality for adult ICU patients based on worst-case values recorded in the first 24 hours.

SAPS II Score
18
Est. Mortality2.9%

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Clinical Overview

The SAPS II (Simplified Acute Physiology Score) is a crucial prognostic tool utilized in Intensive Care Units (ICUs) worldwide. It evaluates the physiological derangement of a patient during their first 24 hours of admission to estimate the probability of hospital mortality.

Pathophysiology & Evidence

SAPS II utilizes 15 variables, including age, basic physiological parameters (heart rate, blood pressure, temperature), laboratory values (WBC, electrolytes, bilirubin, BUN), and chronic disease states. The "worst" value in the first 24 hours is used because it represents the peak physiological stress the patient endured.

Formula Breakdown

The raw SAPS II score is transformed into a mortality probability using a logarithmic equation:

Mortality=e(Logit)/(1+e(Logit))\begin{aligned} Mortality = e^(Logit) / (1 + e^(Logit)) \end{aligned}

Where:
Logit=
-7.7631 + 0.0737 * Score + 0.9971 * ln(Score + 1)

This standardizes mortality reporting across different ICUs, allowing for quality improvement and benchmarking.

Frequently Asked Questions

The Simplified Acute Physiology Score II is a severity of disease classification system used to predict hospital mortality in ICU patients.

It is calculated using the worst physiological values recorded during the first 24 hours of ICU admission.

No, SAPS II is validated exclusively for adult ICU patients (age 18 and older).

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