Risk-Stratified Care era
Peter Safar helped establish modern critical care, advancing ICU ventilation, sedation, and patient safety practices during the 1960s and 1970s. In 1981, Knaus, Draper, Wagner, and Zimmerman introduced APACHE I, a physiologic severity score that anchored risk stratification and guided decisions about monitored versus active ICU therapy. These efforts formalized transfer criteria and prognostic assessments, shaping resource allocation within risk-stratified pathways. Alongside early safety reporting and evolving respiratory support, their work defined bedside decision rules that steered patient trajectories in the era 1965–1984.