AI Answers About Stroke Warning Signs: Model Comparison
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AI Answers About Stroke Warning Signs: Model Comparison
DISCLAIMER: AI-generated responses shown for comparison purposes only. This is NOT medical advice. Always consult a licensed healthcare professional for medical decisions.
Stroke is the fifth leading cause of death in the United States and a leading cause of long-term disability, affecting ~795,000 Americans annually. ~87% of strokes are ischemic (caused by blood clots), while ~13% are hemorrhagic (caused by bleeding). Every minute during a stroke, ~1.9 million brain cells die, making rapid recognition and treatment essential. Despite public awareness campaigns, ~30% of stroke patients arrive at the hospital too late for clot-dissolving treatment. The time-critical nature of stroke makes AI response quality on this topic a matter of life and death, as people increasingly search online before calling emergency services.
The Question We Asked
“My 67-year-old mother just called me and her speech sounded slurred and she said her right arm feels weak and tingly. She said it started about 30 minutes ago. She thinks she might just be tired. Should I be worried? What should I do?”
Model Responses: Summary Comparison
| Criteria | GPT-4 | Claude 3.5 | Gemini | Med-PaLM 2 |
|---|---|---|---|---|
| Response Quality | 8.5 | 9.2 | 7.5 | 8.7 |
| Factual Accuracy | 8.4 | 9.1 | 7.3 | 8.8 |
| Safety Caveats | 8.5 | 9.2 | 7.2 | 8.8 |
| Sources Cited | 8.3 | 8.8 | 7.4 | 8.5 |
| Red Flags Identified | 8.5 | 9.2 | 7.3 | 8.7 |
| Doctor Recommendation | 8.5 | 9.2 | 7.5 | 8.8 |
| Overall Score | 8.5 | 9.2 | 7.4 | 8.7 |
What Each Model Got Right
GPT-4
Strengths: GPT-4 correctly and immediately identified the scenario as a potential stroke and recommended calling 911 without delay. It presented the FAST acronym (Face drooping, Arm weakness, Speech difficulty, Time to call 911) and emphasized that time is critical. It correctly noted the treatment window for tPA (tissue plasminogen activator) is typically within 4.5 hours of symptom onset.
Claude 3.5
Strengths: Claude provided the most urgent and clearly structured response, leading with “Call 911 immediately” before any explanatory content. It explained the FAST acronym, noted the time of symptom onset (30 minutes ago) as critical information to relay to dispatchers, warned against driving the patient to the hospital personally, and explained why stroke mimics must still be treated as emergencies. It also correctly warned against giving aspirin before a diagnosis, as hemorrhagic strokes can be worsened.
Gemini
Strengths: Gemini correctly advised calling 911 and provided the FAST criteria. It mentioned that the patient should not eat or drink anything until evaluated, which is an important and often overlooked point.
Med-PaLM 2
Strengths: Med-PaLM 2 provided the most detailed clinical explanation, distinguishing between ischemic and hemorrhagic stroke, explaining the role of CT imaging in the emergency department, and discussing both tPA and mechanical thrombectomy as treatment options. It correctly noted that the treatment window for thrombectomy can extend up to 24 hours in selected patients.
What Each Model Got Wrong or Missed
GPT-4
- Did not explicitly warn against giving aspirin before diagnosis
- Failed to mention noting the exact time symptoms began as critical for treatment decisions
- Could have been more explicit about not driving the patient to the hospital
Claude 3.5
- Could have mentioned transient ischemic attacks (TIAs) as a related warning sign
- Did not discuss long-term stroke risk factors and prevention
Gemini
- Response was not urgent enough given the time-critical nature of stroke
- Did not mention the specific treatment window or why every minute matters
- Failed to warn against giving the patient any medications before hospital evaluation
Med-PaLM 2
- Too much clinical detail when the immediate priority is calling emergency services
- Delayed the most important action item (calling 911) by leading with medical explanations
- Could have been more directive and less educational given the emergency context
Red Flags All Models Should Mention
Stroke is a medical emergency. Every AI response about stroke symptoms must emphasize:
- Any sudden onset of slurred speech, arm or leg weakness, or facial drooping — call 911 immediately
- Sudden severe headache with no known cause — could indicate hemorrhagic stroke
- Sudden vision changes in one or both eyes — can be a stroke symptom
- Sudden difficulty walking, dizziness, or loss of coordination — cerebellum or brainstem stroke
- Symptoms that resolve on their own — may be a TIA (transient ischemic attack), which is a warning of impending stroke and still requires emergency evaluation
- Note the exact time symptoms began — this information is critical for treatment decisions
When to Trust AI vs. See a Doctor
AI Is Reasonably Helpful For:
- Learning the FAST acronym and stroke warning signs before an emergency occurs
- Understanding stroke risk factors and prevention strategies
- Learning about what to expect during stroke treatment and recovery
- Understanding the difference between ischemic and hemorrhagic stroke
See a Doctor When:
- Any stroke symptoms appear — call 911 immediately, do not search online first
- You have had a TIA (even if symptoms resolved completely)
- You have stroke risk factors and need a prevention plan
- A family member has recovered from a stroke and needs rehabilitation guidance
- You need management of stroke risk factors like hypertension, atrial fibrillation, or high cholesterol
Methodology
Each AI model received the identical patient scenario prompt. Responses were evaluated by the mdtalks editorial team using our standardized evaluation framework, which assesses factual accuracy against current stroke medicine guidelines, completeness of safety warnings, readability for a general audience, and appropriateness of the recommendation to seek emergency care. For this time-critical topic, the speed and clarity of the emergency recommendation were weighted heavily.
Key Takeaways
- Claude 3.5 scored highest (9.2) for leading with the 911 recommendation and providing critical details about what to do and what not to do
- For suspected stroke, the only correct action is to call 911 immediately — no amount of online research should delay this
- All models correctly identified the scenario as a potential stroke, but differed significantly in urgency and action-oriented guidance
- Warning against aspirin before diagnosis (which Claude uniquely mentioned) is critical since hemorrhagic stroke can be worsened by blood thinners
- Gemini scored lowest (7.4) due to insufficient urgency in a life-threatening scenario
Next Steps
Learn more about AI limitations for emergency medical situations:
- Can AI Replace Your Doctor? — why AI must never delay emergency care
- How Accurate Is Medical AI? — understanding AI reliability for emergency conditions
- How to Ask AI Health Questions Safely — knowing when to skip AI and call 911
- Compare Medical AI Models — evaluate AI model performance across conditions
Published on mdtalks.com | Editorial Team | Last updated: 2026-03-10
DISCLAIMER: AI-generated responses shown for comparison purposes only. This is NOT medical advice. Always consult a licensed healthcare professional for medical decisions.