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Determine the Best Diagnostic Image Modality in Peripheral Arterial Disease - Essay Example

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This essay "Determine the Best Diagnostic Image Modality in Peripheral Arterial Disease" is about atherosclerosis leads to all the causes of occlusive arterial disease in the periphery in patients over the age of 40 years. The physical examination is sufficient for the diagnosis of peripheral arterial disease…
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Determine the Best Diagnostic Image Modality in Peripheral Arterial Disease
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Similar to atherosclerosis of the coronary and cerebral arteries, individuals with diabetes mellitus, hypercholesterolemia, hypertension, or hyperhomocysteinemia and cigarette smoking have an increased prevalence of the peripheral arterial disease. These lesions usually involve segments of an artery causing narrowing or occlusion, and these are usually localized in large to medium-sized peripheral blood vessels. Similar to pathology in the coronary arteries, the pathologic hallmark of the lesions involves plaques of atherosclerosis with calcium deposition, thinning of the media, patchy destruction of muscle and elastic fibers, fragmentation of the internal elastic lamina, and thrombi composed of platelets and fibrin (Duerschmied et al., 2006, 310-315). According to statistics delineated in different articles, the primary sites of involvement are the abdominal aorta and iliac arteries comprising 30% of symptomatic patients; the femoral and popliteal arteries consisting of 80 to 90% of patients, and the more distal vessels, including the tibial and peroneal arteries making 40 to 50% of patients (McDermott, 2006, S2).

Mechanically and topographically, atherosclerotic lesions occur preferentially at arterial branch points, which are sites of increased turbulence leading to altered shear stress, and hence injury to the tunica intima. Epidemiologic and demographic data suggest that the distal vasculature is most commonly involved in elderly individuals, mostly in patients with diabetes mellitus (Marso and Hiatt, 2006, 921-929). The history and physical examination are usually sufficient to establish the diagnosis of peripheral arterial disease (PAD).

An objective assessment of the severity of the disease is obtained by noninvasive techniques. These include digital pulse volume recordings; Doppler flow velocity waveform analysis; duplex ultrasonography, which combines B-mode imaging and pulse-wave Doppler examination; segmental pressure measurements; transcutaneous oximetry; stress testing, usually using a treadmill; and tests of reactive hyperemia (Mohler, III, 2003, 2306-2314).

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