AI Answers About Peripheral Artery Disease: Model Comparison
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AI Answers About Peripheral Artery Disease: 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.
Peripheral artery disease (PAD) affects ~8.5 million Americans and more than ~200 million people worldwide. PAD occurs when atherosclerotic plaque narrows the arteries supplying the legs and feet, reducing blood flow. It is a marker for systemic atherosclerosis and significantly increases the risk of heart attack and stroke. Risk factors include smoking (the strongest modifiable risk factor), diabetes, hypertension, high cholesterol, and age over 50. PAD is underdiagnosed — ~40% of affected individuals have no symptoms. Among those with symptoms, intermittent claudication (leg pain with walking) is the hallmark presentation. The cardiovascular implications make accurate health information critically important.
The Question We Asked
“I’m 63 years old and have been getting cramp-like pain in my calves when I walk more than two blocks. The pain goes away after I stop and rest for a few minutes. My feet also feel cold sometimes and I’ve noticed the skin on my lower legs seems thinner and shinier than it used to be. I’m a former smoker and have high blood pressure. Could this be something serious?”
Model Responses: Summary Comparison
| Criteria | GPT-4 | Claude 3.5 | Gemini | Med-PaLM 2 |
|---|---|---|---|---|
| Response Quality | 8.5 | 9.1 | 7.3 | 8.6 |
| Factual Accuracy | 8.4 | 9.0 | 7.2 | 8.8 |
| Safety Caveats | 8.3 | 9.2 | 7.0 | 8.6 |
| Sources Cited | 8.2 | 8.7 | 7.3 | 8.4 |
| Red Flags Identified | 8.5 | 9.1 | 7.1 | 8.7 |
| Doctor Recommendation | 8.5 | 9.2 | 7.4 | 8.8 |
| Overall Score | 8.4 | 9.1 | 7.2 | 8.7 |
What Each Model Got Right
GPT-4
Strengths: GPT-4 correctly identified the symptom pattern as classic intermittent claudication and connected it to peripheral artery disease. It noted the significance of the risk factors — former smoker and hypertension — and correctly explained the ankle-brachial index (ABI) as the primary diagnostic test. It appropriately emphasized that PAD is a systemic condition indicating increased cardiovascular risk.
Claude 3.5
Strengths: Claude provided the most urgent and comprehensive response, correctly identifying the classic claudication pattern and the physical signs (cold feet, thin shiny skin) as consistent with PAD. It emphasized the critically important point that PAD is a marker for coronary and cerebrovascular disease, meaning the patient’s risk of heart attack and stroke is significantly elevated. It discussed the full management approach including antiplatelet therapy, statin therapy, supervised exercise programs, and the importance of aggressive cardiovascular risk factor management.
Gemini
Strengths: Gemini correctly identified smoking history as the most significant risk factor and noted that even former smokers retain elevated risk. It provided practical exercise advice, correctly noting that supervised walking programs can significantly improve claudication distance.
Med-PaLM 2
Strengths: Med-PaLM 2 provided detailed clinical information about the Fontaine classification of PAD severity, the ABI test interpretation, and the role of duplex ultrasound and angiography for treatment planning. It discussed both conservative management and revascularization options (angioplasty, stenting, bypass surgery) with appropriate indications for each.
What Each Model Got Wrong or Missed
GPT-4
- Did not mention the physical examination findings (thin skin, cold feet) as significant
- Failed to emphasize the cardiovascular risk strongly enough
- Could have discussed the supervised exercise program as first-line treatment
Claude 3.5
- Did not discuss revascularization options for progressive disease
- Could have mentioned the critical limb ischemia progression risk
Gemini
- Did not adequately explain the systemic cardiovascular implications of PAD
- Oversimplified management without discussing medication needs
- Failed to convey the seriousness of the diagnosis
Med-PaLM 2
- Too focused on classification and intervention options for an initial presentation
- Did not provide enough practical lifestyle modification advice
- Failed to convey the urgency of the cardiovascular risk assessment
Red Flags All Models Should Mention
PAD can progress to limb-threatening ischemia. These signs require urgent evaluation:
- Rest pain — pain in feet or toes at rest, especially at night — indicates critical limb ischemia
- Non-healing wounds or ulcers on the feet or legs — risk of gangrene and amputation
- Sudden onset of severe leg pain with pallor and coolness — acute limb ischemia, a vascular emergency
- Discoloration of toes (blue, purple, or black) — may indicate tissue death
- Decreased or absent pulses in the feet — advanced arterial disease
- Rapidly worsening claudication — progression of the disease may require intervention
When to Trust AI vs. See a Doctor
AI Is Reasonably Helpful For:
- Understanding what PAD is and recognizing intermittent claudication
- Learning about the connection between PAD and cardiovascular disease risk
- Getting general information about risk factor modification
- Understanding the role of exercise in PAD management
- Learning about diagnostic tests like the ABI
See a Doctor When:
- You experience calf pain with walking that resolves with rest (classic claudication)
- You notice skin changes on your legs or feet (thin skin, hair loss, slow-healing wounds)
- You are a current or former smoker over 50 with leg symptoms
- You have PAD and develop rest pain or non-healing wounds (urgent)
- You need cardiovascular risk assessment alongside PAD evaluation
- You want to discuss medication therapy (antiplatelet, statin)
- You need supervised exercise program referral
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 vascular surgery and cardiology guidelines, completeness of safety warnings, readability for a general audience, and appropriateness of the urgency recommendation. The cardiovascular risk communication was weighted heavily.
Key Takeaways
- Claude 3.5 scored highest (9.1) for its emphasis on PAD as a cardiovascular risk marker and comprehensive management discussion
- The described symptoms are classic for PAD and warrant prompt medical evaluation
- PAD indicates systemic atherosclerosis — the heart attack and stroke risk is as important as the leg symptoms
- Supervised exercise programs are a proven first-line treatment for claudication
- Gemini scored lowest (7.2) due to failing to convey the serious cardiovascular implications
Next Steps
Learn more about AI’s role in cardiovascular health questions:
- Can AI Replace Your Doctor? — why vascular assessment requires clinical expertise
- How Accurate Is Medical AI? — AI reliability for cardiovascular conditions
- How to Ask AI Health Questions Safely — recognizing when symptoms indicate serious disease
- Compare Medical AI Models — compare AI responses for vascular 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.