Apache 2 score Simple easy to reproduce in exam format for DNB Anaesthesia final examination 3 mark answer
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APACHE II score calculation official reference variables points
APACHE II Score
APACHE II = Acute Physiology Score (APS) + Age points + Chronic health points
It is an ICU severity-of-illness score calculated from the worst values during the first 24 hours of ICU admission. Total score: 0-71. Higher score indicates greater severity and mortality risk.
1. Acute Physiology Score: 12 variables
Each variable is allotted 0-4 points according to deviation from normal.
T-MHRR-O pH-SKCHWG
- Temperature
- Mean arterial pressure
- Heart rate
- Respiratory rate
- Respiratory oxygenation
- FiO₂ <50%: use PaO₂
- FiO₂ ≥50%: use A-aDO₂ gradient
- pH arterial
- If ABG unavailable, use serum HCO₃⁻
- Serum sodium
- K serum potassium
- Creatinine
- Hematocrit
- WBC count
- Glasgow Coma Scale: 15 - actual GCS
Note: Double the creatinine score in acute renal failure.
2. Age points
| Age (years) | Points |
|---|---|
| <45 | 0 |
| 45-54 | 2 |
| 55-64 | 3 |
| 65-74 | 5 |
| ≥75 | 6 |
3. Chronic health points
Given in severe chronic organ insufficiency or immunocompromised state:
- Non-operative or emergency postoperative patient: +5
- Elective postoperative patient: +2
Uses
- Assesses severity of illness in ICU patients
- Predicts mortality and permits comparison of ICU outcomes
- Helps in prognosis and audit, but should not be the sole basis for individual treatment decisions
A standard description confirms that APACHE II uses 12 acute physiologic variables, age, and chronic health status, with higher scores reflecting greater illness severity (overview of APACHE II).
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