Ottawa chronic obstructive pulmonary disease risk scale (OCRS)

Guide admission vs discharge in COPD exacerbation

The global unit selector only affects unanswered questions
1.History of CABG?
2.History of intervention for PVD (peripheral vascular disease)?
3.History of intubation for respiratory distress?
4.Heart rate on arrival to emergency department of ≥ 110 bpm?
5.ECG has acute ischemic changes?
6.Chest x-ray has any pulmonary congestion?
7.Hb <100 g/L or 10 g/dL?
8.Urea ≥ 12 mmol/L or BUN ≥ 5.6 mmol/L?
9.Serum CO₂ ≥ 35 mmol/L?
10.Fails reassessment after treatment with resting oxygen saturation (SaO₂) <90% on room air or usual oxygen, or a heart rate ≥120 beats/min?
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1. History of CABG?

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About this Calculator

The Ottawa chronic obstructive pulmonary disease (COPD) risk scale was derived and then validated in an effort to guide more appropriate admission and discharge decisions from the emergency department in the setting of COPD exacerbation.

In the clinical validation of a risk-stratification tool for COPD in the emergency department, it was found that 9.5% of those with COPD exacerbation had short-term serious outcomes, with a concerning proportion occurring in those discharged home from the emergency department.

Short term serious outcome is defined as any of death, admission to monitored unit, intubation, noninvasive ventilation, myocardial infarction (MI) or relapse with hospital admission.

Exacerbation of COPD is defined as an increase in at least 2 of the following 3 criteria: breathlessness, sputum volume or sputum purulence.

A score is assigned by the following variables.

1. Initial assessment

  • a) History of CABG (1)
  • b) History of intervention for PVD (1)
  • c) History of intubation for respiratory distress (2)
  • d) Heart rate on ED arrival > 110 (2)

2. Investigations

  • a) ECG has acute ischemic changes (2)
  • b) Chest x-ray has any pulmonary congestion (1)
  • c) Hemoglobin < 100 g/L (3)
  • d) Urea > 12 mmol/L (1)
  • e) Serum CO2 > 35 mmol/L (1)

3. Re-Assessment after ED treatment

  • a) SaO2 <90% on room air or usual O2, or HR > 120 (2)


Stiell, et al.

Clinical validation of a risk scale for serious outcomes among patients with chronic obstructive pulmonary disease managed in the emergency department.

CMAJ: Canadian Medical Association Journal, Journal de L'Association Medicale Canadienne 2018 December 3, 190 (48): E1406-E1413

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