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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Orthostatic Hypotension Orthostasis means upright posture, and hypotension means low blood pressure. Thus, orthostatic hypotension consists of symptoms of dizziness, faintness or ABC of hypertension: Blood pressure measurement -- O'Brien et al Reference has already been made to the clinical use of ambulatory blood pressure measurement in identifying hypotensive episodes in the elderly, Low blood pressure - WebMD Learn about low blood pressure, also known as hypotension. Low blood pressure can be a sign of good health -- but in the elderly, it can be a sign of Cardiovascular & Circulatory System Health - Promote Normal Blood Natural Remedies to Maintain Normal Blood Pressure. combination dose-dependently reduces tilt induced fall in blood pressure in orthostatic hypotension. ABC of hypertension: Blood pressure measurement -- Beevers et al Some antihypertensive drugs cause postural hypotension, and when this is expected blood pressure should be measured both lying and standing.1 High Blood Pressure: Online References For Health Concerns People using alpha blockers may experience a drop in blood pressure (called orthostatic hypotension) when they go from sitting or lying down to standing. Blood Pressure Health Center Blood pressure is the force of the blood against the artery walls. High blood pressure (hypertension) and low blood pressure (hypotension) can both cause High Blood Pressure: Heart and Blood Vessel Disorders: Merck High blood pressure (hypertension) is abnormally high pressure in the arteries . Secondary Hypertension: High blood pressure with a known cause is called Low blood pressure (hypotension) - CNN.com Many people who have low blood pressure (hypotension) are healthy and have no signs or symptoms related to lower than normal readings. Low Blood Pressure (hypotension) In most people low blood pressure isn't cause for concern unless it results in symptoms such as lightheadedness or fainting. Introduction: Low Blood Pressure: Merck Manual Home Edition Low blood pressure (hypotension) is blood pressure low enough to cause symptoms such as dizziness and fainting. Various drugs and disorders can cause the Low blood pressure - hypotension Low blood pressure or hypotension is persistent abnormally low blood pressure. Blood pressure is the pressure of blood in your arteries. Hypertension - Wikipedia, the free encyclopedia Secondary hypertension indicates that the high blood pressure is a result of Even moderate elevation of arterial blood pressure leads to shortened life What is blood pressure? Blood pressure and hypertension facts. Learn what is considered a normal blood pressure How blood pressure is regulated? What is postural hypotension? Blood Pressure, Low: Hypotension Medline Health information looks at this disorder. An overview and in-depth look at the causes and treatments. Hypotension - Wikipedia, the free encyclopedia In physiology and medicine, hypotension refers to an abnormally low blood pressure. This is best understood as a physiologic state, rather than a disease. Low Blood Pressure (Hypotension) Causes, Symptoms, Diagnosis, and Learn about low blood pressure (hypotension) is blood pressure below normal. Low blood pressure symptoms may include: lightheadedness, dizziness, Low blood pressure (hypotension) - MayoClinic.com Low blood pressure (hypotension) â” Comprehensive overview covers symptoms, causes and treatment of this condition. |
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