The Bronchiectasis Severity Index (BSI) a combined clinical scoring system used to clinically classify the severity of bronchiectasis.
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Score
The score can range from 0 to 25 points and the following parameters are used in its calculation:
-
age (years)
<50 = 0 points
50-69 = 2 points
70-79 = 4 points
>80 = 6 points
-
BMI (kg/m2)
<18.5 = 2 points
≥18.5 = 0 points
-
FEV1% predicted
>80 = 0 points
50-80 = 1 point
30-49 = 2 points
<30 = 3 points
-
number of exacerbations in past year
0-2 = 0 points
≥3 = 2 points
-
number of hospital admissions with severe exacerbation in past two years
0 = 0 points
≥1 = 5 points
-
MRC dyspnea score
1-3 = 0 points
4 = 2 points
5 = 3 points
-
colonization with Pseudomonas aeruginosa
no = 0 points
yes = 3 points
-
colonization with other organisms
no = 0 points
yes = 1 point
-
number of lobes involved radiologically
<3 = 0 points
≥3 or cystic bronchiectasis = 1 point
Interpretation
mild bronchiectasis: 0-4 points
moderate bronchiectasis: 5-8 points
severe bronchiectasis: >8 points
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