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A stroke is the brain losing its blood supply. So it's going to go one of two ways. Either a vessel gets blocked — that's ischemic — or a vessel ruptures and bleeds into or around the brain — that's hemorrhagic. Same organ, same dying tissue, opposite plumbing problem.
Ischemia means the tissue is being held back from blood. That's the root — "ischein" is to hold back, "haima" is blood. Anywhere you see ischemia, tissue is starved of flow, not necessarily dead yet. That distinction matters here. Around the core of dead tissue in an ischemic stroke sits a ring of brain that's underperfused but still alive — the penumbra. That ring is what field treatment is trying to protect.
You screen with your system's stroke tool — Cincinnati or similar. But screening is not the paramedic-level step. Stratifying severity is.
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