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.

blood pressure over palpable
Accuracy of ATLS guidelines for predicting systolic blood pressure
EditorDeakin and Low tested the relation between palpable pulses and systolic blood pressure.2-1 We both remember being assured of this relation as

Arch Intern Med -- Palpable Pulse Delay in Subclavian Steal, Dec
Eguchi et al1 show that real blood pressure differences between right and left blood pressures can change 10 to 20 mm Hg or more over short intervals,

Accuracy of ATLS guidelines for predicting systolic blood pressure
Deakin and Low tested the relation between palpable pulses and systolic blood pressure.1 We both remember being assured of this relation as students (in the

"Clinical Procedures". In: Good Clinical Practice
To measure the blood pressure of a sitting patient, the patient must Place the stethoscope over the elbow, underneath the cuff on the palpable brachial

Hypertension - Wikipedia, the free encyclopedia
These typically only surface with a systolic blood pressure over 240 mmHg higher than the pressure at which the radial pulse was no longer palpable.

Sarcoidosis with palpable nodular myositis, periostitis and large
blood pressure in the right arm was 110/70 mmHg. The least common form of symptomatic sarcoid. A coarse murmur was heard over the left side of her

Accuracy of the advanced trauma life support guidelines for
The advanced trauma life support course teaches that if only the patient's carotid pulse is palpable, the systolic blood pressure is 60-70 mm Hg;

Malignant wide complex tachycardia after adenosine administration
The systolic blood. pressure dropped rapidly to 40 mmHg over palpable. He under-. went immediate direct-current (DC) cardioversion with rapid

University of Chicago Press - Azole-Resistant C. tropicalis
On admission he was unresponsive, with a blood pressure of 70 mm Hg over palpable, a pulse rate of 50/min, an oral temperature of 37.3`C, and a respiratory

Changing The Face Of Blood-Pressure Monitoring
The TL-150 measures systolic blood pressure over a range of 30 to 245 mm Hg and diastolic blood pressure from 20 to 220 mm Hg. Its pulse-rate measurement

Blackwell Synergy - Anaesthesia, Volume 56 Issue 11 Page 1082-1089
The patient's blood pressure was maintained with four 50-eg intravenous doses of phenylephrine given over the next 10 min. Hydrocortisone 300 mg was also


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