Peripheral Artery Disease Diagnosis and Management

Introduction to PAD Diagnosis

• The American College of Cardiology and American Heart Association guidelines recommend using the resting ABI to establish lower extremity PAD diagnosis in patients ≥50 years old with a history of smoking or diabetes 1
• Smoking is the single most important modifiable risk factor for PAD, with heavy smokers having substantially elevated risk 2, 3

PAD Risk Factors and Clinical Presentation

• The presence of normal pulses does NOT reliably rule out PAD 4, 5
• The heel and midfoot pain pattern does not exclude concurrent vascular disease 2

Diagnostic Testing for PAD

• ABI testing is 95% sensitive and specific for angiographic PAD when <0.90 6, 3
• The test is simple, noninvasive, and should be performed in both legs to establish baseline 7, 1

Consequences of Missed Diagnosis and Management

• Patients with PAD have a 25-35% risk of myocardial infarction or stroke over 5 years, with an additional 25% mortality rate 3
• The perioperative period poses particular risk for patients with undiagnosed PAD, especially when combined with immobilization and continued smoking 2

Algorithmic Approach to PAD Diagnosis

• Recognize smoking history as automatic trigger for ABI testing (≥50 years old + smoking history = Class I indication) 1
• Perform bilateral resting ABI regardless of pulse examination findings 7, 1
• If ABI ≤0.90: Confirm PAD diagnosis 1, 8
• If ABI >1.40: Obtain toe-brachial index due to noncompressible vessels 7, 1, 8

Critical Pitfalls to Avoid in PAD Management

• Never rely on palpable pulses alone to exclude PAD - pulses can be normal even with significant disease 4, 5
• Don't underestimate smoking as a risk factor - it's the most potent modifiable risk factor for PAD 2, 3