What is Cholesterol?Cholesterol is a sterol (a combination steroid and alcohol). Cholesterol is a lipid found in the cell membranes of all tissues, and it is transported in the blood plasma of all animals. Because cholesterol is synthesized by all eukaryotes, trace amounts of cholesterol are also found in membranes of plants and fungi.The name originates from the Greek chole- (bile) and stereos (solid), and the chemical suffix -ol for an alcohol, as researchers first identified cholesterol in solid form in gallstones by Francois Poulletier de la Salle in 1769. However, it is only in 1815 that chemist Eugene Chevreul named the compound "cholesterine".[2]Most of the cholesterol is synthesized by the body and some has dietary origin. Cholesterol is more abundant in tissues which either synthesize more or have more abundant densely-packed membranes, for example, the liver, spinal cord and brain. It plays a central role in many biochemical processes, such as the composition of cell membranes and the synthesis of steroid hormones. Cholesterol is insoluble in blood, but is transported in the circulatory system bound to one of the varieties of lipoprotein, spherical particles which have an exterior composed mainly of water-soluble proteins. The main types, low-density lipoprotein (LDL) and high-density lipoprotein (HDL) carry cholesterol from and to the liver.According to the lipid hypothesis, abnormally high cholesterol levels (hypercholesterolemia) and abnormal proportions of LDL and HDL are associated with cardiovascular disease by promoting atheroma development in arteries (atherosclerosis). This disease process leads to myocardial infarction (heart attack), stroke and peripheral vascular disease. As high LDL contributes to this process, it is termed "bad cholesterol", while high levels of HDL ("good cholesterol") offer a degree of protection. The balance can be redressed with exercise, a healthy diet, and sometimes medication. |
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Exercise does not cause an arm-leg blood pressure gradient in In normal subjects the systolic blood pressure (SBP) is lower in the arms than in the legs because of peripheral amplification of the pulse pressure.1,2 The Fainting: Low Blood Pressure: Merck Manual Home Edition If the leg muscles are not used, blood is not pumped back to the heart. As a result, blood pools in the leg veins, and blood pressure falls. Lower Extremity Atherosclerosis To confirm the diagnosis, your doctor may perform a test called a Doppler study to check the blood flow in your legs. Blood pressure cuffs are placed at Recommendations for Blood Pressure Measurement in Humans and A standard adult cuff, a large adult cuff, and a thigh cuff for leg blood pressure measurement and for use in children with very large arms should also be Diagnostic Tests â” Arterial Blood Flow Studies of the Legs People who have leg pain when exercising may need an evaluation to make sure they have normal blood flow through their leg arteries. Normally blood pressure Special Medical Needs of Children - DrGreene.com One of the most common reasons for "high blood pressure" in children is a false in the body) are often overlooked until a leg blood pressure is taken. Extremity Blood Pressure: Details, Preparation & Recovery: BCM Extremity blood pressures are taken in the arms, legs, fingers, and toes. There are three types of extremity blood pressure tests. What Is High Blood Pressure? High blood pressure is a blood pressure reading of 140/90 mmhg or higher. stroke, kidney failure, or amputation of part of the leg. Blood vessels in the VascularWeb: Peripheral Arterial Disease Ankle-brachial index (ABI), which compares the blood pressure in your arms and legs; Blood tests for cholesterol or other markers for artery disease Peripheral Arterial Disease and Claudication -- familydoctor.org The test for checking the blood flow in your legs is called a Doppler study. With this test, cuffs, like the ones used to measure blood pressure in your arm VascularWeb: Ankle Blood Pressure Measurement ABI It can also be used to follow the improvement or worsening of leg circulation over time. For the ABI, your physician measures your blood pressure in your |
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