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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Low Blood Pressure (Hypotension) Causes, Symptoms, Diagnosis, and The diastolic blood pressure (the bottom number) represents the pressure in the Unlike high blood pressure, low blood pressure is defined primarily by Low blood pressure Many people were quite wrongly treated for low blood pressure in the UK in the pressure in your arteries falls and this is known as diastolic pressure. Blood pressure - Wikipedia, the free encyclopedia The values of systolic and diastolic pressure are computed, not actually measured from the raw .. Blood pressure that is too low is known as hypotension. Diastolic Blood Pressure Control: How Low Is Too Low? At what point in the treatment of ISH does the potential harm of low DBP outweigh the benefit of lowering SBP? Is the increased event rate associated with Low blood pressure (hypotension): Causes - MayoClinic.com Some experts define low blood pressure as readings lower than 90 systolic or 60 diastolic â” you need to have only one number in the low range for your blood Arch Intern Med -- Abstract: Low diastolic blood pressure and BACKGROUND: A low diastolic blood pressure has been associated with increased cardiovascular risk. The following proposed mechanisms underlie this The association between low diastolic blood pressure in middle age The association between low diastolic blood pressure in middle age and cognitive function in old age: a population-based study from Age and Ageing in Health MedlinePlus Medical Encyclopedia: Blood pressure The bottom number is the diastolic blood pressure reading. your provider if your blood pressure measurements are consistently high or low or if you have Diagnose-Me: About Diastolic Blood Pressure "Don't know". 2. "Under 70 (low)", Low diastolic blood pressure, A symptom. 3. "70 to 89 (normal)", Normal diastolic blood pressure, A symptom Blood Pressure Hypertension Systolic Diastolic Diastolic pressure is the lower number in a blood pressure reading. and following a low fat diet has been shown to help decrease high blood pressure. Low blood pressure - hypotension Information about low blood pressure. Then it falls to a lower level, called the diastolic pressure, which it reaches just before each heartbeat. |
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