🩻 Intracranial Stenosis (WASID)
UseQuantify intracranial large-artery stenosis to guide intensive medical therapy decisions.
SourceSamuels OB, et al. A standardized method for measuring intracranial arterial stenosis (WASID). AJNR…
This-shift next steps
After scoring: open the scene pack, peer scores, and the matching pathway. Local reference — no HIS write.
Paste the link in Slack, Teams, X, or LinkedIn — the preview image comes from this page’s Open Graph card.
Methodology · worked example, guidelines & full notes
Symptomatic 70–99% stenosis is managed primarily with intensive medical therapy.
When to use
Quantify intracranial large-artery stenosis to guide intensive medical therapy decisions.
How it works
WASID = (1 − Dstenosis/Dnormal)×100, using the proximal normal segment (or distal if proximally diseased). Mild < 50%, moderate 50–69%, severe 70–99%.
Key points
- Symptomatic 70–99% stenosis is managed primarily with intensive medical therapy.
- SAMMPRIS showed routine stenting is not superior to medical therapy.
- Choose the reference segment carefully for the basilar artery.
References
Worked calculation
The values below come from this tool's own example placeholders and are computed server-side with the formula shown on this page, so the arithmetic can be checked quickly. It demonstrates how to substitute values only — it is not clinical advice and not a real case.
| Narrowest stenosis diameter (Dstenosis) | 1.0 mm |
|---|---|
| Proximal normal diameter (Dnormal) | 3.0 mm |
| Vessel | Vertebral artery |
→WASID stenosis67% · Moderate (50–69%)
- WASID：(1 − Dstenosis/Dnormal)×100 = (1 − 1/3)×100 = 67%
- Vessel：Vertebral artery
- Grade：Moderate (50–69%)
Verification & sources · governance
FAQ
Frequently asked questions
- What are the limits and cautions when using Intracranial Stenosis (WASID)?
- For licensed clinicians and clinical researchers. Interpret results with history, investigations and local protocols; not a diagnosis or prescription, and not a substitute for multidisciplinary decision-making or local guidelines.
- Does Intracranial Stenosis (WASID) upload patient data? Where is it calculated?
- Calculation runs locally in the browser; inputs and results are not uploaded. For licensed clinicians only; interpret with history, investigations and local protocols — not a diagnosis or prescription.
- How is Intracranial Stenosis (WASID) calculated in practice? Can you show a worked example?
- Inputs: Narrowest stenosis diameter (Dstenosis) 1.0 mm, Proximal normal diameter (Dnormal) 3.0 mm, Vessel Vertebral artery → Result: WASID stenosis 67 % · Moderate (50–69%)（WASID: (1 − Dstenosis/Dnormal)×100 = (1 − 1/3)×100 = 67%, Vessel: Vertebral artery, Grade: Moderate (50–69%)）