ASPECTS Score Calculator: Acute Ischemic Stroke
Calculate the ASPECTS score online. The Gold Standard radiological tool in neurology to assess ischemic stroke extent and guide thrombolysis.
The ASPECTS Score: Radiological Evaluation of Acute Ischemic Stroke
Published in 2000 by the Alberta Stroke Program research group, the ASPECTS (Alberta Stroke Program Early CT Score) has become the absolute Gold Standard clinical and radiological tool in emergency medicine and neuroradiology. It is used to topographically and quantitatively evaluate the extent of early ischemic changes on a non-contrast brain Computed Tomography (CT) scan. The score is specifically designed for patients presenting with an acute ischemic stroke in the vast territory of the middle cerebral artery (MCA).
How does the ASPECTS score calculation work?
The underlying principle is straightforward yet highly effective: the baseline score is always 10 points, which corresponds to a strictly normal CT scan with no visible signs of ischemia. The neuroradiologist or stroke physician then subtracts 1 point for each distinct anatomical region of the MCA showing early abnormalities (such as focal hypodensity, cytotoxic edema leading to cortical sulcal effacement, or loss of differentiation between cortical gray matter and underlying white matter). The 10 regions are distributed across two levels of axial cuts:
- Ganglionic Level: Includes the caudate nucleus (C), lenticular nucleus (L), internal capsule (IC), insular ribbon (I), as well as the anterior (M1), lateral (M2), and posterior (M3) cortical territories.
- Supraganglionic Level: Includes the cortical territories located directly above the basal ganglia, at the level of the corona radiata (M4, M5, M6).
Therapeutic Importance (Thrombolysis and Thrombectomy)
The ASPECTS score is a critical determinant in life-saving emergency decisions. A high score (between 8 and 10) suggests a small ischemic core, thereby identifying patients who will derive the maximum benefit from recanalization therapy, whether through intravenous thrombolysis (e.g., Alteplase or Tenecteplase) or mechanical thrombectomy. Conversely, a score ≤ 7 (and particularly a score < 6) indicates an extensive cerebral infarction. Historically, these patients were strictly excluded from reperfusion protocols due to a prohibitive risk of fatal hemorrhagic transformation. However, it should be noted that recent high-level clinical trials (such as the SELECT2 and RESCUE-Japan trials) have demonstrated that carefully selected patients with a low ASPECTS score (3 to 5) may still achieve a significant functional benefit from mechanical thrombectomy.
Clinical Interpretation of the ASPECTS Score
| Score | Infarct Extent | Prognosis and Action |
|---|---|---|
| 10 | Normal Scan (No visible ischemia) | Excellent candidate for reperfusion |
| 8 - 9 | Minimal infarct (Few regions affected) | Favorable prognosis with treatment |
| 6 - 7 | Moderate infarct (Clear early signs) | Expert individual evaluation required |
| 0 - 5 | Extensive infarct (Large ischemic core) | Very high risk of hemorrhage |
References:
1. Barber PA, et al. Validity and reliability of a quantitative computed tomography score in predicting outcome of hyperacute stroke before thrombolytic therapy. ASPECTS Study Group. The Lancet. 2000.
[PubMed - NIH]
2. Powers WJ, et al. (AHA/ASA). Guidelines for the Early Management of Patients With Acute Ischemic Stroke: 2019 Update. Stroke. 2019.
[PubMed - AHA]
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