Calculator: APACHE II scoring system by admission diagnosis in adults

Input

Admit diagnosis
Rectal temperature
MAP
HR
RR
A-a gradient or PO₂
pH or HCO₃
Na
K
Creat
Hct
WBC
Glasgow
Age
Chronic disease and operative status

Results

Important: Inputs must be complete to perform calculation.


Score
Log OR
OR
Mortality

Decimal precision

Notes

For the APACHE II score to be correct, a value must be selected for every variable.
The numbers in the parentheses "(…)" represent the point value assigned to each clinical parameter above. The APACHE score is the sum of these points.
The numbers in brackets “[…]” represent the weight assigned to a clinical parameter (if any). Weights are used in the mortality risk calculation.
Admit diagnosis: For postoperative patients admitted to the ICU for sepsis or postcardiac arrest, use the corresponding weights for nonoperative patients.
Chronic diagnosis includes biopsy-proven cirrhosis and documented portal hypertension; past upper gastrointestinal bleeding attributed to portal hypertension; prior hepatic failure; prior hepatic encephalopathy; New York Heart Association (NYHA) Class IV; chronic restrictive, obstructive, or vascular lung disease resulting in severe exercise restriction; documented hypoxemia or hypercapnia; secondary polycythemia; severe pulmonary hypertension (>40 mmHg); ventilator dependence; or chronic hemodialysis.
Chronic diagnosis also includes immunosuppression from chemotherapy, radiation therapy, long-term or recent high-dose steroids, or immunodeficiency (eg, leukemia, lymphoma, AIDS).
Admit diagnosis: admission diagnosis; COPD: chronic obstructive pulmonary disease; ICH/SDH/SAH: intracerebral/subdural/subarachnoid hemorrhage; MAP: mean arterial pressure; HR: heart rate; RR: respiratory rate; A-a gradient: alveolar-arterial gradient; PaO₂: partial pressure (arterial) oxygen; FiO₂: fraction of inspired oxygen; PaCO₂: partial pressure (arterial) carbon dioxide; pH: (-) log base 10 of the hydrogen ion concentration; HCO3: plasma bicarbonate concentration; ABG: arterial blood gases; Na: plasma sodium concentration; K: plasma potassium concentration; ARF: acute renal (kidney) failure (injury); WBC: white blood cells; AIDS: acquired immunodeficiency syndrome; OR: odds ratio; mortality: risk of death during hospitalization; ICU: intensive care unit.

Equations used

Score = Rectal_temperature + MAP + HR + RR + Aa_Gradient_or_PO2 + pH_or_HCO3 + Na + K + Creat + Hct + WBC + Glasgow + Age + Chronic_disease_and_operative_status_points

Log_OR = -3.517 + (Score * 0.146) + Chronic_disease_and_operative_status_weight + Admit_diagnosis_weight

OR = e^(Log_OR)

Mortality = 100 * OR / ( 1 + OR )

References

Knaus WA, et al. APACHE II: a severity of disease classification system. Crit Care Med 1985; 13:818.

Only digits 0 to 9 and a single decimal point (".") are acceptable as numeric inputs. Attempted input of other characters into a numeric field may lead to an incorrect result.

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All information contained in and produced by the EBMcalc system is provided for educational purposes only. This information should not be used for the diagnosis or treatment of any health problem or disease. THIS INFORMATION IS NOT INTENDED TO REPLACE CLINICAL JUDGMENT OR GUIDE INDIVIDUAL PATIENT CARE IN ANY MANNER. Click here for full notice and disclaimer.

Topic 13445 Version 19.0

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Calculator: APACHE II scoring system by admission diagnosis in adults