Forty Years of Silent Revolutions in ICUs: From Clinical Records to Intelligent and Predictive Surveillance

Introduction

In the mid-1980s, as modern intensive care medicine was still consolidating as a specialty, a conceptual challenge emerged that would redefine critical care: how to objectively and comparably quantify the severity of illness across different patients and units. In 1985, William A. Knaus et al. published the Acute Physiology and Chronic Health Evaluation II (APACHE II). This landmark model translated clinical observations into a mathematical framework capable of estimating hospital mortality based on 12 physiological and chronic health variables collected during the first 24 hours of ICU admission.

At that time, computing power was limited, and data were collected manually, the technological ceiling of that era.

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