cliot (version 1.0.0)

alberta_stroke_aspects: Alberta Stroke Program Early CT Score (ASPECTS)

Description

Calculates the ASPECTS score to quantitate the severity of early ischemic changes on non-contrast CT scans in patients with acute ischemic stroke of the anterior circulation. The score starts at 10 and 1 point is subtracted for every region showing early ischemic changes. Lower scores indicate larger infarct volumes and poorer outcomes.

Usage

alberta_stroke_aspects(caudate, lentiform, internal_capsule, insular_cortex,
                       m1, m2, m3, m4, m5, m6)

Value

A list containing:

ASPECTS_Value

The final score (Range 0-10).

Interpretation

Prognostic grouping based on the score (e.g., Score < 8 correlates with poor outcome).

Arguments

caudate

Numeric (0 or 1). Early ischemic change in the Caudate nucleus? (1 = Yes, 0 = No).

lentiform

Numeric (0 or 1). Early ischemic change in the Lentiform nucleus? (1 = Yes, 0 = No).

internal_capsule

Numeric (0 or 1). Early ischemic change in the Internal Capsule? (1 = Yes, 0 = No).

insular_cortex

Numeric (0 or 1). Early ischemic change in the Insular Cortex? (1 = Yes, 0 = No).

m1

Numeric (0 or 1). Early ischemic change in the "M1" region (Anterior MCA cortex)? (1 = Yes, 0 = No).

m2

Numeric (0 or 1). Early ischemic change in the "M2" region (MCA cortex lateral to insular ribbon)? (1 = Yes, 0 = No).

m3

Numeric (0 or 1). Early ischemic change in the "M3" region (Posterior MCA cortex)? (1 = Yes, 0 = No).

m4

Numeric (0 or 1). Early ischemic change in the "M4" region (Anterior MCA territory superior to M1)? (1 = Yes, 0 = No).

m5

Numeric (0 or 1). Early ischemic change in the "M5" region (Lateral MCA territory superior to M2)? (1 = Yes, 0 = No).

m6

Numeric (0 or 1). Early ischemic change in the "M6" region (Posterior MCA territory superior to M3)? (1 = Yes, 0 = No).

References

Barber PA, Demchuk AM, Zhang J, Buchan AM. Validity and reliability of a quantitative computed tomography score in predicting outcome of hyperacute stroke before thrombolytic therapy. ASPECTS Study Group. Alberta Stroke Programme Early CT Score. Lancet. 2000;355(9216):1670-1674. doi:10.1016/s0140-6736(00)02237-6

Examples

# Example 1: Large Infarct (Score 6)
# Caudate, Lentiform, IC, and Insula involved
alberta_stroke_aspects(1, 1, 1, 1, 0, 0, 0, 0, 0, 0)

# Example 2: Normal CT (Score 10)
# No ischemic changes
alberta_stroke_aspects(0, 0, 0, 0, 0, 0, 0, 0, 0, 0)