shorr_score_mrsa: Shorr Score for MRSA Pneumonia

In cliot: Clinical Indices and Outcomes Tools

Shorr Score for MRSA Pneumonia

Description

Calculates the Shorr Score to predict the probability of Methicillin-resistant Staphylococcus aureus (MRSA) etiology in patients with pneumonia. The score helps identify patients at low risk who may not require empiric anti-MRSA therapy.

Usage

shorr_score_mrsa(age, nursing_home, heart_failure, cerebrovascular_disease,
                 diabetes, icu_admission_24h)

Arguments

age	Numeric. Patient age in years. <30: 0 pts 30-39: 1 pt 40-49: 2 pts 50-59: 3 pts 60-69: 4 pts 70-79: 5 pts >=80: 6 pts
nursing_home	Numeric (0 or 1). Residence in a nursing home or extended care facility. (1 = Yes, +4 pts).
heart_failure	Numeric (0 or 1). History of heart failure. (1 = Yes, +2 pts).
cerebrovascular_disease	Numeric (0 or 1). History of cerebrovascular disease (e.g., stroke, TIA). (1 = Yes, +2 pts).
diabetes	Numeric (0 or 1). History of diabetes mellitus. (1 = Yes, +1 pt).
icu_admission_24h	Numeric (0 or 1). Admission to the ICU within 24 hours of presentation. (1 = Yes, +2 pts).

Value

A list containing:

Shorr_Score	The calculated total score (Range 0-17).
Risk_Category	Classification (Low 0-1, Intermediate 2-5, High >=6).

References

Shorr AF, Zilberberg MD, Micek ST, Kollef MH. Prediction of infection due to antibiotic-resistant bacteria by select risk factors for health care-associated pneumonia. Arch Intern Med. 2008;168(20):2205-2210. doi:10.1001/archinte.168.20.2205

Examples

# Example 1: Low Risk
# Age 45 (+2), No other factors
# Score = 2
# Let's recheck 45yo -> 2 pts.
# 2 points -> Intermediate.
shorr_score_mrsa(45, 0, 0, 0, 0, 0)

# Example 2: High Risk
# Age 80 (+6), Nursing Home (+4), Diabetes (+1)
# Score = 11
shorr_score_mrsa(80, 1, 0, 0, 1, 0)

cliot documentation built on Dec. 1, 2025, 1:06 a.m.