When someone has a stroke, the medical response moves through several stages: recognition, emergency imaging, restoring blood flow or stopping bleeding, and then weeks to months of rehabilitation. Every minute matters in the early phase because brain tissue is dying as long as it’s cut off from oxygen. Here’s what happens at each step.
Recognizing a Stroke: The B.E. F.A.S.T. Signs
Treatment starts before the hospital. The American Stroke Association uses the acronym B.E. F.A.S.T. to help bystanders spot a stroke quickly:
- Balance loss
- Eye (vision) changes
- Face drooping
- Arm weakness
- Speech difficulty
- Time to call 911
The “B” and “E” are newer additions. Older versions of the acronym only covered face, arm, and speech, which meant strokes affecting balance or vision were easier to miss. If any of these signs appear suddenly, calling emergency services immediately gives the person the best chance of recovery.
What Happens in the Emergency Room
The first priority is figuring out which type of stroke is happening. About 87% of strokes are ischemic, meaning a blood clot is blocking flow to the brain. The rest are hemorrhagic, caused by a burst blood vessel that bleeds into or around the brain. The treatments are essentially opposite: one type needs the clot dissolved, the other needs the bleeding stopped. Giving a clot-busting drug to someone with a brain bleed would be catastrophic, so imaging comes first.
A CT scan of the head takes only seconds and is the gold standard for detecting bleeding in the brain. If there’s no bleed, the team shifts focus to the clot. CT angiography, which maps the blood vessels from the chest to the top of the head, can be done in under a minute and shows exactly where a clot is lodged. CT perfusion scanning goes a step further, revealing how much brain tissue is still salvageable versus how much has already been permanently damaged. That distinction between “still alive but starving” and “already dead” tissue is one of the most important factors in deciding how aggressively to treat.
Dissolving the Clot
For ischemic strokes, the frontline treatment is a clot-dissolving medication given through an IV. The drug must be administered within 4.5 hours of when symptoms started. Traditionally, this has been alteplase, which is given as an infusion over about an hour. A newer alternative, tenecteplase, works the same way but is given as a single injection, making it faster and simpler to administer. The 2023 European Stroke Organisation guideline now recommends tenecteplase as an equal alternative, and large clinical trials have provided strong evidence that it works just as well.
The 4.5-hour window is firm. After that, the risks of bleeding from the medication begin to outweigh the benefits. This is why the phrase “time is brain” dominates stroke care. Every 15-minute delay in treatment costs the patient measurable amounts of brain tissue.
Removing the Clot Physically
When a large artery in the brain is blocked, medication alone often isn’t enough. In these cases, doctors perform a mechanical thrombectomy: threading a thin catheter through an artery in the groin, navigating it up to the brain, and physically pulling the clot out. You’re under sedation or general anesthesia for this.
The treatment window for thrombectomy is much wider than for clot-dissolving drugs. Current guidelines recommend it in selected patients for up to 24 hours after symptom onset, even when imaging shows that a significant area of brain tissue has already been damaged. The decision depends on how much salvageable tissue remains, which is why those detailed perfusion scans matter so much. Thrombectomy has been one of the biggest advances in stroke care in the past decade, dramatically improving outcomes for the most severe strokes.
Treating a Bleeding Stroke
Hemorrhagic strokes require a completely different approach. The goal is to stop the bleeding and relieve pressure building up inside the skull. If the bleed was caused by a ruptured aneurysm (a weak, ballooned-out spot on a blood vessel), surgeons have two main options.
The first is surgical clipping, where a neurosurgeon opens the skull and places a tiny metal clip at the base of the aneurysm to seal it off. The second is endovascular coiling, a less invasive approach where a catheter is threaded through blood vessels and tiny platinum coils are packed into the aneurysm to block blood flow into it. The choice between the two depends on the aneurysm’s location, size, and shape, along with the patient’s age and overall health. Neither option is universally better; the decision is made case by case.
Why a Stroke Unit Matters
Where you’re treated makes a significant difference. Patients treated in dedicated stroke units have substantially better outcomes than those treated in general hospital wards. In one major study, the death rate within the first 10 days was 8.2% in a stroke unit compared to 15.1% in a general ward. At one year, 70.6% of stroke unit patients were still alive versus 64.6% of those treated on general wards.
The difference was even more dramatic for bleeding strokes. Only 24.5% of hemorrhagic stroke patients died within 10 days in a stroke unit, compared to 51.6% on general wards. That’s roughly half the mortality rate. Stroke units achieve this through specialized monitoring, faster response to complications, and teams trained specifically in stroke care. If you have any say in where someone is taken, a hospital with a certified stroke center is worth the extra travel time.
Preventing a Second Stroke
After surviving an ischemic stroke, the risk of having another one is highest in the first few weeks. To reduce that risk, doctors typically start a short course of dual blood-thinning therapy, combining two medications that prevent platelets from clumping together. The optimal duration appears to be 21 to 30 days for minor strokes. Clinical trials involving over 11,000 patients showed this approach reduced the chance of a second stroke without significantly increasing bleeding risk during that window.
Beyond 30 days, the bleeding complications from dual therapy begin to outweigh the benefits, so most patients transition to a single blood thinner for the long term. The exception is patients whose stroke was caused by severe narrowing of arteries inside the brain, where 90 days of dual therapy may be recommended. Alongside medication, the long-term prevention plan typically involves managing blood pressure, cholesterol, diabetes, and lifestyle factors like smoking and physical activity.
Rehabilitation and Recovery
Once the immediate crisis is over, rehabilitation begins as early as possible. Early intervention is crucial because the brain’s ability to rewire itself, called neuroplasticity, is strongest in the weeks and months following a stroke. Rehab typically involves a combination of physical therapy, occupational therapy, and speech therapy depending on which abilities were affected.
Several specific techniques are designed to take advantage of neuroplasticity. Constraint-induced movement therapy involves restricting the unaffected arm (with a mitt or sling) to force the brain to rebuild pathways controlling the weakened side. It sounds counterintuitive, but by preventing the “good” arm from compensating, the brain is pushed to reactivate and strengthen connections to the impaired limb. Task-oriented training takes a different angle, having patients practice real-world activities like reaching, grasping, and walking over and over. The repetition reinforces the neural pathways involved, essentially training the brain to reroute around damaged areas.
Some rehabilitation programs also use noninvasive brain stimulation, where magnetic fields or low electrical currents are applied to the scalp to boost activity in specific brain regions. This is typically used alongside traditional therapy rather than as a standalone treatment.
Post-Stroke Depression
Depression after a stroke is extremely common, and it’s not simply a reaction to disability. The stroke itself can damage brain circuits involved in mood regulation. Canadian stroke guidelines recommend that all stroke survivors be screened for depression because of how frequently it occurs and how treatable it is.
If treatment is started (usually with an antidepressant), it should continue for at least 6 to 12 months when it’s working well. If there’s no improvement within 2 to 4 weeks, the dose may be increased or the medication switched. When it’s eventually time to stop, the medication is tapered gradually over one to two months rather than stopped abruptly, and monitoring continues because depression can return. Recognizing and treating post-stroke depression isn’t a secondary concern. It directly affects how well someone participates in rehabilitation and how fully they recover.