Beyond FAST: balance, vision, and last-known-well decisions
A practical emergency-recognition lesson that extends FAST into B.E. F.A.S.T., last-known-well timing, temporary symptoms, and what information to give responders
Why this matters
The job of a bystander is not to diagnose stroke perfectly. It is to recognize enough danger to call emergency help quickly and preserve the treatment window
FAST is the core check
FAST stands for Face, Arm, Speech, Time. Ask the person to smile and look for one-sided droop. Ask them to raise both arms and look for drift or weakness. Listen for slurred speech, strange words, or trouble understanding. If any sign is sudden, Time means call emergency services now
Do not wait for every sign. One sudden sign is enough. Do not give food, drink, or extra medicine while trying to decide
Beyond FAST: balance and eyes
B.E. F.A.S.T. adds Balance and Eyes. Sudden severe dizziness, inability to walk straight, loss of coordination, double vision, or loss of vision can be stroke symptoms, especially when they appear suddenly or with other neurologic changes
Posterior circulation strokes can be missed when people expect only face, arm, and speech symptoms. The safest rule is simple: sudden neurologic change deserves urgent evaluation
Last known well
Last known well is the last time the person was definitely at their normal baseline. If someone wakes up with symptoms, last known well is usually when they were last seen normal before sleep, not when symptoms were discovered
Write the time down and tell emergency responders. Treatment choices may depend on this timeline
What to do and what not to do
- Call emergency services immediately when sudden stroke symptoms appear
- Note last known well and any medicines, especially blood thinners
- Keep the person safe and sitting or lying if weak or dizzy
- Do not drive the person yourself if emergency services are available
- Do not wait to see if symptoms return after they disappear
Watch and connect
How to Recognize and Respond to a Stroke | First Aid Tips - The Red Cross video gives a direct FAST response demonstration for the first minutes of a possible stroke.
In practice
A man suddenly cannot keep his balance and says the room is spinning. His face looks normal and his speech is mostly clear. Because sudden severe balance change can be a stroke symptom, his partner calls emergency services and reports that he was last normal 20 minutes earlier
★ Key takeaways
- FAST checks face, arm, speech, and time; B.E. F.A.S.T. adds balance and eyes
- Any sudden stroke warning sign is enough to call emergency services
- Last known well means last confirmed normal baseline
- Temporary symptoms still require urgent evaluation
Lesson quiz
Check this lesson
Answer these lesson-specific questions before continuing. They focus on the decisions, scenarios, and safety points covered above.
0 of 3 answered
Complete every question, then submit once to see all correct and incorrect answers.
References
- Tier 1American Stroke Association2024Stroke Symptoms
- Tier 1American Stroke Association2024TIA (Transient Ischemic Attack)
- Tier 1American Heart Association / American Stroke Association20192019 AHA/ASA Acute Ischemic Stroke Guideline Update