Pneumonia Severity Index (PSI)
Pulmonology
Also known as: PORT score · PORT-Score · Pnömoni Şiddet İndeksi (PSI) · Pneumonia Severity Index (PSI / PORT score)
What it is for
The Pneumonia Severity Index (PSI), derived by the Pneumonia Patient Outcomes Research Team (PORT), sorts adults with community-acquired pneumonia into five risk classes using 20 variables in two steps. Outline only; the point values are in the original table.
Classification
| Category | Description |
|---|---|
| Step 1 (class I) | age ≤50 years with none of five coexisting illnesses (neoplastic disease, liver disease, congestive heart failure, cerebrovascular disease, renal disease) and none of five examination findings (altered mental status, pulse ≥125/min, respiratory rate ≥30/min, systolic blood pressure <90 mmHg, temperature <35 °C or ≥40 °C): class I, no points needed. |
| Step 2 variables | everyone else gets points for age (in years, with a reduction for women), nursing-home residence, the five illnesses, the five examination findings, and seven laboratory or imaging findings (arterial pH, blood urea nitrogen, sodium, glucose, haematocrit, arterial oxygen (PaO2), pleural effusion on chest radiograph). |
| Class II | ≤70 points |
| Class III | 71-90 points |
| Class IV | 91-130 points |
| Class V | >130 points |
| Interpretation | classes I-III are usually grouped as low risk, class IV as moderate and class V as high risk. |
Source
A prediction rule to identify low-risk patients with community-acquired pneumonia
N Engl J Med 1997;336:243-250 (Fine MJ et al.)
DOI: 10.1056/NEJM199701233360402
PMID: 8995086
- Edition
- Fine et al. 1997 (PORT); classes I-V unchanged
- Checked on
Summary of the published classification in our own words. Not a substitute for the original publication.
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