Screening Guidelines
The American College of Cardiology/American Heart Association (ACC/AHA) guidelines on PAD have identified the following groups with a higher prevalence of PAD where screening may be appropriate12:
- Age ≥65 years
- Age 50 to 64 years with risk factors for atherosclerosis (e.g., diabetes mellitus, history of smoking, hyperlipidemia, hypertension) or family history of PAD
- Age <50 with diabetes mellitus and one additional risk factor for atherosclerosis
- Known atherosclerosis at other sites (e.g., coronary, carotid, renal artery disease)
- A history of claudication, other non-joint related exertional lower extremity symptoms, impaired walking function, and/or ischemic rest pain
- Physical presentation with abnormal lower extremity pulses, vascular bruit, non-healing lower extremity wound or gangrene, or other suggestive physical findings (e.g., elevation pallor/dependent rubor)
Diagnosis of PAD
Patients at risk for PAD should undergo a comprehensive vascular examination and PAD screening should always include questions related to a history of walking impairment, extremity pain that might be due to ischemia, and the presence of non-healing wounds. Since the presentation of PAD can vary, patients with risk factors for PAD who report no or few symptoms should be asked about functional capacity and decline in activity over time, including exertional non-joint related pain.12
For many patients, a history of risk factors or symptoms of PAD, in combination with physical examination findings, is sufficient to establish a diagnosis of PAD. Patients with atypical symptoms or abnormal physical findings require confirmation with an Ankle-Brachial Index (ABI) to establish the diagnosis of PAD. The ACC/AHA guidelines recommend for patients with a history or physical examination findings suggestive of PAD, a resting ABI, with or without segmental pressures and waveforms, is recommended to establish the diagnosis.12
Clinical classification of chronic lower extremity PAD is based upon the severity of symptoms and differentiates the advanced signs of PAD, tissue loss, such as ulceration and gangrene. The later stages of the disease, ischemic rest pain and tissue loss, are considered critical limb ischemia (CLI).13
Rutherford Clinical Classification