Clinical variables contributing to preliminary Ottawa COPD Risk Scale to identify patients with COPD seen in the emergency department who are at high risk of a serious adverse event
| Variable | Points |
|---|---|
| History | |
| Coronary bypass graft | 1 |
| Peripheral vascular disease intervention | 1 |
| Intubation for respiratory distress | 2 |
| Examination | |
| Heart rate on arrival in ED ≥ 110/min | 2 |
| Too ill to do walk test after treatment in ED (Sao2 < 90% or heart rate ≥ 120/min) | 2 |
| Investigations | |
| Acute ischemic changes on ECG | 2 |
| Pulmonary congestion evident on chest radiography | 1 |
| Hemoglobin < 100 g/L | 3 |
| Urea ≥ 12 mmol/L | 1 |
| Serum CO2 ≥ 35 mmol/L | 1 |
| Total score (possible range 0–16) | |
Note: COPD = chronic obstructive pulmonary disease, ECG = electrocardiogram, ED = emergency department, Sao2 = arterial oxygen saturation.