Match each clinical presentation of lower extremity vascular disease to its most likely un… — USMLE Step 2 CK

Match each clinical presentation of lower extremity vascular disease to its most likely underlying anatomical pathology or diagnosis.

A 58-year-old male smoker reports new-onset erectile dysfunction and cramping pain in both buttocks and thighs when walking. Examination reveals absent femoral pulses bilaterally.Aortoiliac occlusive disease
A 72-year-old female with untreated atrial fibrillation suddenly develops agonizing pain in her left leg. The leg is cool, pale, and lacks palpable pulses below the femoral artery.Acute arterial thromboembolism
A 65-year-old male complains of right calf pain occurring consistently after walking two blocks. His right femoral pulse is normal, but right popliteal and pedal pulses are completely absent.Femoropopliteal occlusive disease
A 70-year-old male presents with acute right foot pain, pallor, and cyanosis. Examination reveals a bounding, abnormally enlarged pulse behind the right knee, but absent pedal pulses on the same side.Popliteal artery aneurysm thrombosis
A 35-year-old male heavy smoker presents with severe resting foot pain and ulceration on his left great toe. Popliteal pulses are normal, but pedal pulses are absent, accompanied by migrating tender cords on his superficial calf.Thromboangiitis obliterans

Cevap

1 matches with Aortoiliac occlusive disease; 2 matches with Acute arterial thromboembolism; 3 matches with Femoropopliteal occlusive disease; 4 matches with Popliteal artery aneurysm thrombosis; 5 matches with Thromboangiitis obliterans.

Each clinical scenario presents a classic vignette for a distinct vascular pathology. Aortoiliac occlusive disease (Leriche syndrome) causes bilateral buttock/thigh claudication, erectile dysfunction, and absent femoral pulses due to aortic bifurcation occlusion. Acute arterial thromboembolism typically presents with abrupt onset of the '6 Ps' of acute limb ischemia in a patient with a cardioembolic source (e.g., atrial fibrillation). Femoropopliteal occlusive disease, the most common site of peripheral arterial disease, causes calf claudication with palpable femoral but absent popliteal/pedal pulses. Popliteal artery aneurysm frequently presents with acute limb ischemia secondary to thrombosis or microembolization from the aneurysmal sac (evident as a bounding popliteal mass). Thromboangiitis obliterans (Buerger disease) presents in young smokers with distal extremity ischemia, ischemic ulcerations, and superficial thrombophlebitis, while sparing larger proximal vessels.

Adım Adım Çözüm

Identify the classic triad in the first patient: buttock/thigh claudication, impotence, and absent femoral pulses.

This combination points to a proximal occlusion at the aortic bifurcation (Leriche syndrome).

Bilateral proximal disease occludes flow to the internal iliacs (causing impotence) and external iliacs/femoral arteries (causing absent pulses and claudication).

Analyze the sudden onset of unilateral ischemic symptoms in the second patient with atrial fibrillation.

This points to acute arterial thromboembolism.

Atrial fibrillation predisposes to left atrial thrombus formation, which can embolize to the peripheral arteries, causing sudden occlusion without prior chronic claudication symptoms.

Evaluate the third patient presenting with calf claudication, normal femoral pulses, but absent popliteal pulses.

This indicates femoropopliteal occlusive disease.

The disease is distal to the common femoral artery but proximal to or involving the popliteal artery, which supplies the calf muscles.

Assess the acute ischemia associated with a bounding mass behind the knee in the fourth patient.

This points to popliteal artery aneurysm thrombosis.

Popliteal artery aneurysms often present not with free rupture, but with acute thrombosis or distal embolization, cutting off blood supply to the foot.

Consider the young smoker with digital ischemia and superficial thrombophlebitis in the fifth patient.

This is characteristic of thromboangiitis obliterans (Buerger disease).

Buerger disease is a nonatherosclerotic, segmental, inflammatory vasculitis that specifically affects small to medium-sized vessels in young smokers.

Anahtar Kavram

Peripheral vascular diseases exhibit distinct clinical presentations based on the anatomical level of occlusion, chronicity, underlying pathophysiology, and associated risk factors.

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