1
Subarachnoid hemorrhage (SAH) is only 6–8% of strokes — but accounts for 25% of cerebrovascular deaths.
Just one FDA-approved drug since 1983. The grading scale we still use is from 1980. We can do better.
6.7s
AI segmentation time
99.8%
accuracy vs manual
10 mL
outcome threshold
The Story · 5-Part Thread
2
The Modified Fisher scale has inter-rater reliability around 0.3 — basically a coin flip.
And once a patient is "Fisher 4," everyone looks the same on paper — even though outcomes vary 10x.
3
Enter SAHVAI — our SAH Volumetric AI:
- Quantifies bleed in 6.7 sec (vs 60–93 min manual)
- 99.8% accuracy
- 3D maps predict where delayed cerebral ischemia will strike
- 4D tracks blood clearance day-by-day
4
The magic number is 10 mL.
SAHV >10 mL → 47.8% poor outcome (mRS 4–6) vs 6.1%.
Our eSAH Score (Age + GCS + SAHV) beats WFNS for mortality — AUC 0.80 vs 0.75. Each point = 2.14x risk.
5
Why this matters globally:
Brazilian SAH mortality 23.4% vs 13.4% in the US. Time-to-treatment 77.7h vs 4.3h.
The Inverse Care Law is real — and AI is the fastest way to close the gap.
$5.6B
Annual U.S. lifetime cost of SAH