Essential
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  Essential



Essential

   1. Something that cannot be done without. 2. Required in the diet, because the body cannot make it. As in an essential amino acid or an essential fatty acid. 3. Idiopathic. As in essential hypertension.

RELATED TERMS
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Diet
In nutrition, the diet is the sum of the food consumed by a body. Proper nutrition for a human requires vitamins, minerals, proteins, and fuel in the form of carbohydrates and fats. Imbalances between the consumed fuels and expended energy results in either starvation or excessive reserves of adipose tissue, or body fat

Essential
1. Something that cannot be done without. 2. Required in the diet, because the body cannot make it. As in an essential amino acid or an essential fatty acid. 3. Idiopathic. As in essential hypertension.

Idiopathic
Of unexplained origin, as in the development of a symptom or syndrome that is apparently spontaneously generated.

Hypertension




SIMILAR TERMS
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Essen doctors
All doctors near Essen, Germany. Doctors who can assist a patient in Essen.

Essential Amino Acids
Amino acids that are not synthesized by the human body in amounts sufficient to carry out physiological functions. They are obtained from dietary foodstuffs.

Essential Drugs
Drugs considered essential to meet the health needs of a population as well as to control drug costs. (World Health Organization Action Programme on Essential Drugs, 1994, p3)

Essential Fatty Acid
A type of fatty acid that the body cannot produce and which must be obtained from food; play a role in recovery after surgery, the making of cell membranes, and prevention of infection.

Essential fatty acid
An unsaturated fatty acid that is essential to human health, but cannot be manufactured in the body. There are three types of essential fatty acids (EFAs): arachnoidic acid, linoleic acid, and linolenic acid. When obtained in the diet, linoleic acid can be converted to both arachnoidic and linolenic acid. It is commonly found in cold-pressed oils, and is particularly high in oils extracted from cold-water fish and certain seeds. Recent research has explored the role of EFAs in the nervous system health. Supplementation with certain EFOs appears to be useful as a treatment for certain neurological disorders. However, arachnoidic acid may lower the seizure threshold. For that reason, always consult a knowledgeable physician before starting a program of EFA supplementation.

Essential Fatty Acids
Long chain organic acid molecules that must be obtained from the diet. Examples are LINOLEIC ACIDS and LINOLENIC ACIDS.

Essential Gene
Those genes found in an organism which are necessary for its viability and normal function.

Essential Genes
Those genes found in an organism which are necessary for its viability and normal function.

Essential Hypercholesterolemia
A familial disorder characterized by increased plasma concentration of cholesterol carried in low density lipoproteins (LDL) and by a deficiency in a cell surface receptor which regulates LDL degradation and cholesterol synthesis.

Essential Hypercholesterolemias
A familial disorder characterized by increased plasma concentration of cholesterol carried in low density lipoproteins (LDL) and by a deficiency in a cell surface receptor which regulates LDL degradation and cholesterol synthesis.

Essential Intracranial Hypotension
Reduction of CEREBROSPINAL FLUID pressure characterized clinically by HEADACHE which is maximal in an upright posture and occasionally by an abducens nerve palsy (see ABDUCENS NERVE DISEASES), neck stiffness, hearing loss (see DEAFNESS), NAUSEA, and other symptoms. This condition may be spontaneous or secondary to SPINAL PUNCTURE; NEUROSURGICAL PROCEDURES; DEHYDRATION; UREMIA; trauma (see also CRANIOCEREBRAL TRAUMA); and other processes. Chronic hypotension may be associated with subdural hematomas (see HEMATOMA, SUBDURAL) or hygromas. (From Semin Neurol 1996 Mar;16(1):5-10; Adams et al., Principles of Neurology, 6th ed, pp637-8)

Essential mixed cryoglobulinemia
A condition in which cryoglobulin proteins which are a mixture of various antibody types form for unknown (essential) reasons. Cryoglobulins are abnormal blood proteins that, by definition, have the unusual properties of precipitating from the blood serum when it is chilled (hence the "cryo-") and redissolving upon rewarming. Cryoglobulins are gamma globulins with a molecular weight of approximately 200,000.

Essential oil
An oil derived from a natural substance, usually either for its healing properties or as a perfume. Some pharmaceuticals, and many over-the-counter or "holistic" remedies, are based on or contain essential oils. Examples include products containing camphor or eucalyptus that help relieve congestive coughs, and the essential oils used in the practice of aromatherapy.

Essential Oils
Oils which evaporate readily. The volatile oils occur in aromatic plants, to which they give odor and other characteristics. Most volatile oils consist of a mixture of two or more TERPENES or of a mixture of an eleopten (the more volatile constituent of a volatile oil) with a stearopten (the more solid constituent). The synonym essential oils refers to the essence of a plant, as its perfume or scent, and not to its indispensibility. (From Dorland, 28th ed)

Essential Osteolyses
Syndromes of bone destruction where the cause is not obvious such as neoplasia, infection, or trauma. The destruction follows various patterns: massive (Gorham disease), multicentric (Hajdu-Cheney syndrome, Winchester syndrome), or carpal/tarsal.

Essential Osteolysis
Syndromes of bone destruction where the cause is not obvious such as neoplasia, infection, or trauma. The destruction follows various patterns: massive (Gorham disease), multicentric (Hajdu-Cheney syndrome, Winchester syndrome), or carpal/tarsal.

Essential Polyarteritides
A form of necrotizing vasculitis involving small- and medium-sized arteries. The signs and symptoms result from infarction and scarring of the affected organ system.

Essential Polyarteritis
A form of necrotizing vasculitis involving small- and medium-sized arteries. The signs and symptoms result from infarction and scarring of the affected organ system.

Essential Thrombocythemia
A clinical syndrome characterized by repeated spontaneous hemorrhages and a remarkable increase in the number of circulating platelets.

Essential Thrombocythemias
A clinical syndrome characterized by repeated spontaneous hemorrhages and a remarkable increase in the number of circulating platelets.

Essential tremor
Uncontrollable shaking (tremor) of the hands and head and sometimes other parts of the body.In more than half of cases, essential tremor is inherited in an autosomal dominant manner. The mainstays of treatment are drugs such as propranolol and primidone.

Essential Tremor
A relatively common disorder characterized by a fairly specific pattern of tremors which are most prominent in the upper extremities and neck, inducing titubations of the head. The tremor is usually mild, but when severe may be disabling. An autosomal dominant pattern of inheritance may occur in some families (i.e., familial tremor). (Mov Disord 1988;13(1):5-10)

Essential Tremor, Benign
A relatively common disorder characterized by a fairly specific pattern of tremors which are most prominent in the upper extremities and neck, inducing titubations of the head. The tremor is usually mild, but when severe may be disabling. An autosomal dominant pattern of inheritance may occur in some families (i.e., familial tremor). (Mov Disord 1988;13(1):5-10)

Essential Tremors
A relatively common disorder characterized by a fairly specific pattern of tremors which are most prominent in the upper extremities and neck, inducing titubations of the head. The tremor is usually mild, but when severe may be disabling. An autosomal dominant pattern of inheritance may occur in some families (i.e., familial tremor). (Mov Disord 1988;13(1):5-10)

Essential Tremors, Benign
A relatively common disorder characterized by a fairly specific pattern of tremors which are most prominent in the upper extremities and neck, inducing titubations of the head. The tremor is usually mild, but when severe may be disabling. An autosomal dominant pattern of inheritance may occur in some families (i.e., familial tremor). (Mov Disord 1988;13(1):5-10)

Essential Vertigo
An illusion of movement, either of the external world revolving around the individual or of the individual revolving in space. Vertigo may be associated with disorders of the inner ear, vestibular nerve, brainstem, and cerebral cortex. Lesions in the temporal and parietal lobes may be associated with FOCAL SEIZURES that may feature vertigo as an ictal manifestation. (From Adams et al., Principles of Neurology, 6th ed, pp300-1)

Essential vulvodynia
A chronic, diffuse, unremitting sensation of burning of the vulva a painful sensation which may extend to the perineum, thigh or buttock and is often associated with discomfort in the urethra and rectum. Vulvodynia means "painful vulva." Essential vulvodynia occurs primarily in postmenopausal women. There are no reliable data on the prevalence of essential vulvodynia. The main symptom is pain, usually a sensation of burning, irritation or rawness of the genitals. The pain is quite variable. It can vanish as suddenly as it started. The main finding demonstrable on a medical physical examination is hyperesthesia. The cause of essential vulvodynia is unknown. There is some evidence that damage to the nerves, particularly the pudendal nerve, supplying this area may play a role.



PREVIOUS AND NEXT TERMS
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Esophagogastric tamponade
A procedure in which a balloon is inflated within the esophagus and stomach to apply pressure on bleeding blood vessels, compress the vessels, and stop the bleeding. Used in the treatment of bleeding veins in the esophagus (esophageal varices) and stomach. The balloon used in the esophagus is shaped like a sausage while that in the stomach is rounded. Esophagogastric tamponade is also called balloon tamponade.

Esophagogastroduodenoscopy
Also known as EGD or upper endoscopy. A procedure that enables the examiner (usually a gastroenterologist) to examine the esophagus (the swallowing tube), stomach, and duodenum (the first portion of small bowel) using a thin flexible tube (a "scope") that can be looked through or seen on a TV monitor.

Esophagoscopy
Examination of the esophagus using a thin, lighted instrument.

Esophagram
A series of x-rays of the esophagus. The x-ray pictures are taken after the patient drinks a solution that coats and outlines the walls of the esophagus. Also called a barium swallow.

ESRD
End-stage renal disease.

Essential

Essential fatty acid
An unsaturated fatty acid that is essential to human health, but cannot be manufactured in the body. There are three types of essential fatty acids (EFAs): arachnoidic acid, linoleic acid, and linolenic acid. When obtained in the diet, linoleic acid can be converted to both arachnoidic and linolenic acid. It is commonly found in cold-pressed oils, and is particularly high in oils extracted from cold-water fish and certain seeds. Recent research has explored the role of EFAs in the nervous system health. Supplementation with certain EFOs appears to be useful as a treatment for certain neurological disorders. However, arachnoidic acid may lower the seizure threshold. For that reason, always consult a knowledgeable physician before starting a program of EFA supplementation.

Essential mixed cryoglobulinemia
A condition in which cryoglobulin proteins which are a mixture of various antibody types form for unknown (essential) reasons. Cryoglobulins are abnormal blood proteins that, by definition, have the unusual properties of precipitating from the blood serum when it is chilled (hence the "cryo-") and redissolving upon rewarming. Cryoglobulins are gamma globulins with a molecular weight of approximately 200,000.

Essential oil
An oil derived from a natural substance, usually either for its healing properties or as a perfume. Some pharmaceuticals, and many over-the-counter or "holistic" remedies, are based on or contain essential oils. Examples include products containing camphor or eucalyptus that help relieve congestive coughs, and the essential oils used in the practice of aromatherapy.

Essential tremor
Uncontrollable shaking (tremor) of the hands and head and sometimes other parts of the body.In more than half of cases, essential tremor is inherited in an autosomal dominant manner. The mainstays of treatment are drugs such as propranolol and primidone.

Essential vulvodynia
A chronic, diffuse, unremitting sensation of burning of the vulva a painful sensation which may extend to the perineum, thigh or buttock and is often associated with discomfort in the urethra and rectum. Vulvodynia means "painful vulva." Essential vulvodynia occurs primarily in postmenopausal women. There are no reliable data on the prevalence of essential vulvodynia. The main symptom is pain, usually a sensation of burning, irritation or rawness of the genitals. The pain is quite variable. It can vanish as suddenly as it started. The main finding demonstrable on a medical physical examination is hyperesthesia. The cause of essential vulvodynia is unknown. There is some evidence that damage to the nerves, particularly the pudendal nerve, supplying this area may play a role.

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