Unlike the SAPS-II mortality risk assessment, the APACHE II score cannot be directly converted to a percent risk of mortality. Converting APACHE II to Percent Mortality The APACHE II score ranges from 0 to 71 points however, it is rare for any patient to accumulate more than 55 points. The study did not continually calculate an APACHE II scores beyond the first 24 hours of ICU admission. The "worst" measurement was defined as the measure that correlated to the highest number of points.
The worst physiological variables were collected within the first 24 hours of ICU admission. Within the study period, 87% of all ICU patients had all 12 physiologic measurements available. The APACHE II score is made of 12 physiological variables and 2 disease-related variables. The authors excluded CABG patients because surgical and anesthetic management resulted in falsely elevated APACHE II scores despite a low mortality rate of 1.5%. Initially, the authors did not plan to exclude any patients however, CABG patients (N=785) were later excluded, resulting in a total patient population of 5,030. The study initially enrolled 5,815 patients admitted to 13 intensive care units in the United States from 1979 to 1982. The Acute Physiology and Chronic Health Evaluation (APACHE II) is a severity score and mortality estimation tool developed from a large sample of ICU patients in the United States.
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