A nurse is assessing a 72-year-old client with a history of diabetes and suspected peripheral arterial disease.

Absence of dorsalis pedis and posterior tibial pulses is the most definitive sign of arterial insufficiency in peripheral arterial disease. Other findings suggest venous issues or inflammation.

Understanding the Pathophysiology

To answer this question, you must connect the underlying disease process—peripheral arterial disease (PAD)—with the expected physical assessment findings. PAD is characterized by the progressive narrowing of the arteries, most commonly in the lower extremities, due to atherosclerosis. This buildup of plaque reduces blood flow to the tissues distal to the narrowing. When assessing a client with diabetes, the risk is compounded because diabetes accelerates atherosclerosis and can cause peripheral neuropathy, which may mask the classic symptom of claudication pain. The clinical validation study by Beigzadeh et al. specifically highlights that in patients with diabetic foot ulcers, a primary defining characteristic of ineffective peripheral tissue perfusion is a decrease in peripheral pulses ^[2]. This occurs because the stenotic or occluded arteries cannot deliver a strong pulsatile flow of blood to the feet. The absence of the dorsalis pedis and posterior tibial pulses is a direct, objective sign of this severe flow limitation and is a hallmark finding in advanced PAD.

Analyzing the Correct Answer

The correct answer is the absence of dorsalis pedis and posterior tibial pulses. These pulses are the most distal palpable pulses in the lower extremity, and their absence is a cardinal sign of PAD. The research by Chicharro-Luna et al. underscores the importance of a meticulous vascular assessment in patients with diabetes, as clinical signs like pulse palpation are fundamental to diagnosing PAD before more advanced diagnostics like the ankle-brachial index (ABI) are used . When atherosclerotic plaque calcifies and hardens, as described in the context of intravascular lithotripsy treatment, it physically impedes blood flow . Your palpation of these pulses is a direct assessment of whether enough blood is perfusing past potential blockages in the femoral, popliteal, and tibial arteries. A diminished or absent pulse is a more specific indicator of arterial insufficiency than other signs.

Distinguishing from Incorrect Options

It is critical to differentiate the findings of PAD from those of venous insufficiency or other conditions. The remaining options describe a different pathophysiological process.

• Pitting edema in both lower extremities is a classic sign of venous insufficiency or fluid volume overload (e.g., heart failure), not arterial disease. In PAD, the limb typically appears thin, atrophic, and without significant edema because the problem is an inadequate inflow of blood, not a backup of venous return.


• Warm, reddened skin over the affected area is a sign of inflammation or infection, such as cellulitis, or it describes the dependent rubor seen in severe PAD. However, dependent rubor occurs only when the leg is in a dependent position. The classic skin assessment for chronic PAD is cool, pale, and shiny skin due to chronically reduced blood supply. Warmth is not a feature of uncomplicated PAD.


• Superficial varicose veins along the medial thigh are a manifestation of venous insufficiency, specifically involving incompetent valves in the great saphenous vein. This finding is unrelated to the arterial system's pathology of atherosclerosis and reduced perfusion pressure.

The assessment of peripheral pulses remains a cornerstone of the vascular examination. In a patient with diabetes and suspected PAD, the inability to palpate the dorsalis pedis and posterior tibial pulses provides strong clinical evidence of significant arterial occlusion, directly reflecting the defining characteristic of decreased tissue perfusion validated in nursing research ^[2].