Arozullah Postoperative Pneumonia Risk Index
Arozullah postoperative pneumonia risk index: a point score from surgery type, age, function, BUN, and ten clinical risk flags mapped to a risk class.
Open the calculator → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Type of surgery
- Thoracic (14)
- Age band
- 60–69 (9)
- Functional status
- Independent (0)
- Blood urea nitrogen
- 8–21 mg/dL (0)
- History of COPD
- Yes
Result: Arozullah 28 points: class 3 — predicted postoperative pneumonia risk 4.0%.
The tool opens with these values already filled in. Replace them with your own.
What the result means
- Classes
- class 1 (0-15) 0.2%; class 2 (16-25) 1.2%; class 3 (26-40) 4.0%; class 4 (41-55) 9.4%; class 5 (> 55) 15.3% (development-cohort rates).
- BUN
- U-shaped: < 8 mg/dL adds 4, the 8-21 normal band adds 0, 22-30 adds 2, >= 30 adds 3. The pneumonia companion to ariscat.
What you enter
- Type of surgery
- Age band
- Functional status
- Blood urea nitrogen (BUN)
- Weight loss > 10% in 6 months (7)
- History of COPD (5)
- General anesthesia (4)
- Impaired sensorium (4)
The other 6 fields
- History of cerebrovascular accident (4)
- Transfusion > 4 units (3)
- Emergency surgery (3)
- Chronic steroid use (3)
- Current smoker within 1 year (3)
- Alcohol > 2 drinks/day (2)
How this is calculated
Arozullah AM, Khuri SF, Henderson WG, Daley J. Development and validation of a multifactorial risk index for predicting postoperative pneumonia after major noncardiac surgery. Ann Intern Med. 2001;135(10):847-857. Read the source ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.