An under-recognized and usually asymptomatic condition called subclavian artery stenosis – an obstruction of arteries located under the clavicle, or collarbone – is important in the diagnosis and treatment of high blood pressure, according to a study by researchers at the University of California, San Diego (UCSD) School of Medicine and Northwestern University’s Feinberg School of Medicine in Chicago.
Published in the August 4, 2004 issue of the Journal of the American College of Cardiology, the study investigated the prevalence of subclavian artery stenosis (SS) in 4,223 individuals, and determined risk factors.
SS was found in approximately 2 percent of individuals without cardiovascular problems and in 7 percent of those currently under a doctor’s care for cardiovascular conditions. Patients most at risk were those with current or past smoking histories, higher than normal systolic blood pressure, lower levels of HDL cholesterol, and the presence of peripheral arterial disease (PAD), which is characterized by narrowing of the arteries in the legs and arms due to build-up of atherosclerotic plaque on vessel walls. Patients with PAD were found to be at a fivefold greater risk of having SS.
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