ottawa_heart_failure_risk_scale: Ottawa Heart Failure Risk Scale (OHFRS)

In cliot: Clinical Indices and Outcomes Tools

Ottawa Heart Failure Risk Scale (OHFRS)

Description

Calculates the Ottawa Heart Failure Risk Scale to predict the risk of serious adverse events (SAEs) within 14 days in patients with acute heart failure presenting to the emergency department. SAEs include death, admission to a monitored unit, intubation/NIV, MI, or relapse requiring admission.

Usage

ottawa_heart_failure_risk_scale(stroke_tia_history, intubation_history,
                                heart_rate_arrival, oxygen_sat_arrival,
                                heart_rate_walk_test, ecg_ischemia, urea_mmol_l,
                                co2_mmol_l, troponin_elevated, nt_probnp)

Arguments

stroke_tia_history	Numeric (0 or 1). History of Stroke or TIA. (1 = Yes, +1 point).
intubation_history	Numeric (0 or 1). History of intubation for respiratory distress. (1 = Yes, +2 points).
heart_rate_arrival	Numeric. Heart rate on ED arrival. (>= 110 bpm adds 2 points).
oxygen_sat_arrival	Numeric. Oxygen saturation on arrival (%). (< 90% adds 1 point).
heart_rate_walk_test	Numeric. Heart rate during 3-minute walk test (or enter >=110 if too ill to walk). (>= 110 bpm adds 1 point).
ecg_ischemia	Numeric (0 or 1). New ischemic changes on ECG. (1 = Yes, +2 points).
urea_mmol_l	Numeric. Serum Urea (BUN) level in mmol/L. (>= 12 mmol/L adds 1 point). Note: 12 mmol/L approx 33.6 mg/dL BUN.
co2_mmol_l	Numeric. Serum CO2 (Bicarbonate) level in mmol/L. (>= 35 mmol/L adds 2 points).
troponin_elevated	Numeric (0 or 1). Troponin I or T elevated to MI levels. (1 = Yes, +2 points).
nt_probnp	Numeric. NT-proBNP level in ng/L (pg/mL). (>= 5000 ng/L adds 1 point).

Value

A list containing:

OHFRS_Score	The calculated risk score (Range 0-15).
Risk_Category	Classification (Low, Moderate, High, Very High).
Risk_Serious_Adverse_Event_14d	Estimated percentage probability of a serious adverse event within 14 days.

References

Stiell IG, Clement CM, Brison RJ, et al. A risk scoring system to identify emergency department patients with heart failure at high risk for serious adverse events. Acad Emerg Med. 2013;20(1):17-26. doi:10.1111/acem.12056 Stiell IG, Perry JJ, Clement CM, et al. Prospective and Explicit Clinical Validation of the Ottawa Heart Failure Risk Scale, With and Without Use of Quantitative NT-proBNP. Acad Emerg Med. 2017;24(3):316-327. doi:10.1111/acem.13141

Examples

# Example 1: High Risk
# Prior Intubation (+2), HR 115 (+2), Trop High (+2), Urea 15 (+1), NT-proBNP 6000 (+1)
# Score = 8
ottawa_heart_failure_risk_scale(0, 1, 115, 95, 80, 0, 15, 25, 1, 6000)

# Example 2: Low Risk
# No history, Vitals stable, Labs normal
# Score = 0
ottawa_heart_failure_risk_scale(0, 0, 80, 98, 85, 0, 5, 24, 0, 400)

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