cliot (version 1.0.0)

crb65_pneumonia_severity: CRB-65 Score for Pneumonia Severity

Description

Calculates the CRB-65 score to stratify the severity of community-acquired pneumonia (CAP). Unlike the CURB-65 score, CRB-65 does not require blood urea nitrogen (BUN) measurement, making it suitable for use in primary care or settings without immediate laboratory access.

Usage

crb65_pneumonia_severity(confusion, respiratory_rate, systolic_bp,
                         diastolic_bp, age)

Value

A list containing:

CRB65_Score

The calculated score (Range 0-4).

Risk_Level

Classification (Very Low, Increased, High).

Est_Mortality_30_Day

Estimated mortality percentage.

Recommendation

Guidance on disposition (Home vs. Hospital).

Arguments

confusion

Numeric (0 or 1). Recent confusion. (1 = Yes, +1 point).

respiratory_rate

Numeric. Respiratory rate in breaths per minute. (>= 30 bpm adds +1 point).

systolic_bp

Numeric. Systolic blood pressure in mmHg. (< 90 mmHg contributes to the BP criterion).

diastolic_bp

Numeric. Diastolic blood pressure in mmHg. (<= 60 mmHg contributes to the BP criterion). Note: The BP criterion is met if SBP < 90 OR DBP <= 60 (+1 point).

age

Numeric. Patient age in years. (>= 65 years adds +1 point).

References

Lim WS, van der Eerden MM, Laing R, et al. Defining community acquired pneumonia severity on presentation to hospital: an international derivation and validation study. Thorax. 2003;58(5):377-382. doi:10.1136/thorax.58.5.377

Examples

# Example 1: High Risk
# 70yo (+1), Confused (+1), RR 32 (+1), BP 100/70 (0)
# Score = 3
crb65_pneumonia_severity(1, 32, 100, 70, 70)

# Example 2: Low Risk
# 40yo (0), Not confused (0), RR 18 (0), BP 120/80 (0)
# Score = 0
crb65_pneumonia_severity(0, 18, 120, 80, 40)