canadian_tia_score: Canadian Transient Ischemic Attack (TIA) Score

In cliot: Clinical Indices and Outcomes Tools

Canadian Transient Ischemic Attack (TIA) Score

Description

Calculates the Canadian TIA Score to stratify the risk of subsequent stroke within 7 days in patients presenting to the Emergency Department with a TIA. It incorporates history, clinical features, vital signs, and investigations (CT, laboratory) to categorize patients into Low, Medium, or High risk.

Usage

canadian_tia_score(history_tia_stroke, history_afib, unilateral_weakness,
                   speech_disturbance, duration_ge_10min, dbp_ge_110,
                   platelets_ge_400, glucose_ge_15, ct_findings,
                   carotid_stenosis_ge_50)

Arguments

history_tia_stroke	Numeric (0 or 1). History of previous TIA or Stroke. (1 = Yes, +1 point).
history_afib	Numeric (0 or 1). History of Atrial Fibrillation or new AFib on ECG. (1 = Yes, +2 points).
unilateral_weakness	Numeric (0 or 1). Unilateral weakness. (1 = Yes, +2 points).
speech_disturbance	Numeric (0 or 1). Speech disturbance (aphasia or dysarthria). (1 = Yes, +2 points).
duration_ge_10min	Numeric (0 or 1). Duration of symptoms >= 10 minutes. (1 = Yes, +2 points).
dbp_ge_110	Numeric (0 or 1). Diastolic Blood Pressure >= 110 mmHg at triage or initial assessment. (1 = Yes, +2 points).
platelets_ge_400	Numeric (0 or 1). Platelet count >= 400 x 10^9/L. (1 = Yes, +2 points).
glucose_ge_15	Numeric (0 or 1). Serum glucose >= 15 mmol/L (>= 270 mg/dL). (1 = Yes, +2 points).
ct_findings	Numeric (0, 1, or 2). Findings on initial CT Head. 0: Normal or non-specific. 1: Old infarction only (+1 point). 2: Acute infarction (with or without old infarction) (+2 points).
carotid_stenosis_ge_50	Numeric (0 or 1). Carotid stenosis >= 50% on Doppler US or CTA. (1 = Yes, +2 points).

Value

A list containing:

Canadian_TIA_Score	The calculated score.
Risk_Category	"Low Risk" (Score <= 3), "Medium Risk" (Score 4-8), or "High Risk" (Score > 8).
Subsequent_Stroke_Risk_7_Day	Estimated probability of stroke within 7 days.

References

Perry JJ, Sharma M, Sivilotti ML, et al. Prospective validation of the Canadian TIA Score and comparison with the ABCD2 and ABCD2-I scores. Stroke. 2014;45(6):1645-1652. doi:10.1161/STROKEAHA.114.004652

Examples

# Example 1: High Risk
# Hx Stroke (+1), AFib (+2), Weakness (+2), Duration >10m (+2), CT Acute (+2)
# Score = 9
canadian_tia_score(1, 1, 1, 0, 1, 0, 0, 0, 2, 0)

# Example 2: Low Risk
# Speech dist (+2), Duration 5 min (0), Normal CT (0), No other factors
# Score = 2
canadian_tia_score(0, 0, 0, 1, 0, 0, 0, 0, 0, 0)

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