FAST Stroke Recognition Mnemonic
FAST is the critical mnemonic for rapid stroke recognition. Time is brain in stroke management, and every minute of delayed treatment results in the loss of approximately 1.9 million neurons. The FAST assessment enables nurses, patients, and bystanders to quickly identify stroke symptoms and activate emergency medical services. This is an essential NCLEX topic for neurological nursing.
The Mnemonic
"FAST"
Breakdown
Face Drooping
Ask the patient to smile. Does one side of the face droop or feel numb? Facial asymmetry is a hallmark sign of stroke, caused by damage to the motor cortex or cranial nerve VII. The affected side droops while the unaffected side moves normally.
Arm Weakness
Ask the patient to raise both arms. Does one arm drift downward? Unilateral arm weakness or inability to raise one arm indicates motor cortex involvement. Test arm drift by having the patient hold both arms extended with palms up and eyes closed for 10 seconds.
Speech Difficulty
Ask the patient to repeat a simple sentence. Is speech slurred, garbled, or incomprehensible? Can the patient understand what you are saying? Aphasia (language impairment) and dysarthria (slurred speech) are common stroke presentations.
Time to Call 911
If any of these symptoms are present, call 911 immediately and note the time of symptom onset. The window for thrombolytic therapy (tPA/alteplase) is within 3-4.5 hours of symptom onset. The exact time of onset determines eligibility for treatment.
Clinical Relevance
On the NCLEX, stroke questions test your knowledge of time-dependent interventions. The door-to-needle time goal for tPA administration is 60 minutes. tPA is only effective within 3-4.5 hours of symptom onset and is contraindicated in hemorrhagic stroke. The nurse must know the time of symptom onset, obtain a CT scan to rule out hemorrhage before tPA administration, and monitor for bleeding complications after thrombolytic therapy.
Study Tips
- ✓Remember: time of symptom onset is the most critical piece of information for stroke patients. Always document and communicate it.
- ✓tPA (alteplase) window: 3-4.5 hours from onset. CT scan must be done first to rule out hemorrhagic stroke.
- ✓Hemorrhagic stroke is treated with surgical intervention and blood pressure management, NOT thrombolytics.
- ✓Stroke symptoms are contralateral: right brain damage causes left-sided symptoms and vice versa.
FAQs
Common questions about this mnemonic
Ischemic stroke (87% of strokes) is caused by a blood clot blocking blood flow to the brain and is treated with thrombolytics (tPA) within the treatment window. Hemorrhagic stroke (13%) is caused by a ruptured blood vessel bleeding into the brain and is treated with surgical intervention, blood pressure control, and reversal of anticoagulants. Giving tPA for a hemorrhagic stroke is fatal, which is why a CT scan is required before treatment.
Thrombolytic therapy (tPA/alteplase) must be administered within 3-4.5 hours of symptom onset to be effective and safe. Beyond this window, the risk of hemorrhagic conversion outweighs the benefit. If the patient woke up with symptoms and the exact onset time is unknown, the last known well time (when the patient was last seen normal) is used. This often means wake-up strokes do not qualify for tPA.