Ottawa Heart Failure Risk Scale Calculator

Calculate an Ottawa Heart Failure Risk Scale variable count for short-term serious adverse event risk after emergency department heart failure assessment.

Ottawa HF Risk calculator

Use this Ottawa Heart Failure Risk Scale calculator as a structured checklist for acute heart failure discharge risk discussions. It combines bedside features, oxygen saturation, laboratory markers, ECG ischaemia, and biomarker elevation.

Prior stroke/TIA

Arrival by ambulance

Heart rate

bpm

Oxygen saturation

Urea

mmol/L

Serum CO₂/bicarbonate

mmol/L

Elevated troponin

NT-proBNP ≥5000 ng/L

Acute ischaemic ECG changes

Ottawa HF risk variables

0 selected

Few selected risk features present

Objective triggers

HR ≥110: no, SpO₂ <90%: no

Use local pathways for disposition decisions.

Clinical decision support only. Verify unusual values, follow local guidelines, and interpret calculations alongside the full clinical picture.

Equations used on this page

Ottawa Heart Failure Risk Scale point count here includes prior stroke/TIA, arrival by ambulance, heart rate ≥110, oxygen saturation <90%, urea >12 mmol/L, CO₂ >35 mmol/L, elevated troponin, NT-proBNP ≥5000 ng/L, and acute ischaemic ECG changes.

Clinical notes

The Ottawa scale supports, but does not replace, emergency clinician judgement about admission, observation, and follow-up.

Use local assay cut-offs for troponin and natriuretic peptides and consider renal function, frailty, social context, and treatment response.

References

Stiell IG, Perry JJ, Clement CM, et al. Ottawa Heart Failure Risk Scale

These calculators are designed for clinician decision support and SEO-friendly public education. Verify results against the original method and the patient context before making decisions.