cliot (version 1.0.0)

ottawa_copd_risk_scale: Ottawa COPD Risk Scale

Description

Calculates the Ottawa COPD Risk Scale score to predict the risk of short-term serious adverse events (SAEs) in patients presenting to the Emergency Department with acute exacerbation of COPD. SAEs include death, intubation, non-invasive ventilation, MI, or readmission.

Usage

ottawa_copd_risk_scale(history_copd, history_intubation, history_revascularization,
                       sa02_on_arrival, ecg_ischemia, antianginal_medication,
                       heart_rate_on_arrival, cxr_pulmonary_venous_congestion,
                       hemoglobin_on_arrival, bun_on_arrival)

Value

A list containing:

Ottawa_COPD_Risk_Score

The calculated total score (Range 0-16).

Risk_Short_Term_Adverse_Event

Estimated percentage probability of an adverse event within 30 days.

Arguments

history_copd

Numeric (0 or 1). Validated only for patients with COPD.

history_intubation

Numeric (0 or 1). History of intubation for respiratory distress. (1 = Yes, +2 pts).

history_revascularization

Numeric (0 or 1). History of coronary revascularization (CABG/PCI). (1 = Yes, +1 pt).

sa02_on_arrival

Numeric. Initial oxygen saturation on arrival (%). (< 92% adds 2 pts).

ecg_ischemia

Numeric (0 or 1). Evidence of acute ischemia on ECG. (1 = Yes, +2 pts).

antianginal_medication

Numeric (0 or 1). Use of antianginal medication (e.g., nitroglycerin). (1 = Yes, +1 pt).

heart_rate_on_arrival

Numeric. Initial heart rate (bpm). (>= 110 bpm adds 2 pts).

cxr_pulmonary_venous_congestion

Numeric (0 or 1). Pulmonary venous congestion on Chest X-ray. (1 = Yes, +2 pts).

hemoglobin_on_arrival

Numeric. Hemoglobin level on arrival (g/L). (< 100 g/L adds 3 pts).

bun_on_arrival

Numeric. Urea (BUN) level on arrival (mmol/L). (> 12 mmol/L adds 1 pt).

References

Stiell IG, Clement CM, Aaron SD, et al. Clinical characteristics associated with adverse events in patients with exacerbation of chronic obstructive pulmonary disease: a prospective cohort study. CMAJ. 2014;186(6):E193-204. doi:10.1503/cmaj.130968

Examples

# Example 1: High Risk
# Prior intubation (+2), Low SaO2 (+2), Tachycardia (+2), Low Hb (+3)
# Score = 9
ottawa_copd_risk_scale(1, 1, 0, 88, 0, 0, 120, 0, 90, 5)

# Example 2: Low Risk
# Only high BUN (+1)
# Score = 1
ottawa_copd_risk_scale(1, 0, 0, 95, 0, 0, 80, 0, 140, 15)