Coma
: A state of deep unarousable unconsciousness. Coma may occur as the result of numerous causes including head trauma, diseases such as diabetes, poisoning, etc.
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1. A state of profound unconsciousness from which one cannot be roused; may be due to the action of an ingested toxic substance or of one formed in the body, to trauma, or to disease. [G. koma, deep sleep, trance] 2. An aberration of spherical lenses; occurring in cases of oblique incidence ( e.g., the image of a point becomes comet-shaped). [G. kome, hair] 3. SYN: c. aberration.
- delayed c. after hypoxia c. that develops a few days to 3 weeks after an acute hypoxic insult; the latter was usually severe enough to cause an initial bout of c., which cleared, and was followed by a transient interval of apparent normality. SYN: severe postanoxic encephalopathy.
- diabetic c. c. that develops in severe and inadequately treated cases of diabetes mellitus and is commonly fatal, unless appropriate therapy is instituted promptly; results from reduced oxidative metabolism of the central nervous system that, in turn, stems from severe ketoacidosis and possibly also from the histotoxic action of the ketone bodies and disturbances in water and electrolyte balance. SYN: Kussmaul c..
- hepatic c. c. that occurs with advanced hepatic insufficiency and portal-systemic shunts, caused by elevated blood ammonia levels; characteristic findings include asterixis in the precoma stage and paroxysms of bilaterally synchronous triphasic waves on EEG examination.
- hyperosmolar (hyperglycemic) nonketotic c. (hi′per-os-mo-lar) a complication seen in diabetes mellitus in which very marked hyperglycemia occurs (such as levels over 800 mg/dL) causing osmotic shifts in water in brain cells and resulting in c.. It can be fatal or lead to permanent neurologic damage. Ketoacidosis does not occur in these cases. SYN: nonketotic hyperglycemia.
- hypoglycemic c. a metabolic encephalopathy caused by hypoglycemia; usually seen in diabetics, and due to exogenous insulin excess.
- hypoventilation c. c. seen with advanced lung failure and resultant hypoventilation. SYN: CO2 narcosis, hypoxic-hypercarbic encephalopathy, pulmonary encephalopathy.
- Kussmaul c. SYN: diabetic c..
- metabolic c. c. resulting from diffuse failure of neuronal metabolism, caused by such abnormalities as intrinsic disorders of neuron or glial cell metabolism, or extracerebral disorders that produce intoxication or electrolyte imbalances.
- thyrotoxic c. c. preceding death in severe hyperthyroidism, as in thyroid storm or thyrotoxic crisis.
- trance c. SYN: lethargic hypnosis.
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Committee on Medical Aspects [food and nutrition]

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co·ma 'kō-mə n a state of profound unconsciousness caused by disease, injury, or poison

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n.
a state of unrousable unconsciousness. See also Glasgow scoring system.

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co·ma (koґmə) [L., from Gr. kōma] 1. a state of unconsciousness from which the patient cannot be aroused, even by powerful stimulation; called also exanimation. See also consciousness. 2. the optical aberration produced when an image is received upon a screen which is not exactly at right angles to the line of propagation of the incident light.

Medical dictionary. 2011.

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  • coma — coma …   Dictionnaire des rimes

  • COMA — Le coma est un état caractérisé par la perte de la conscience et par la perte plus ou moins complète des fonctions de relation: sensibilité et motricité. Cependant, certaines fonctions végétatives (qui entretiennent la nutrition) sont… …   Encyclopédie Universelle

  • Coma — puede tener los siguientes significados: en medicina, coma (del griego κῶμα o κωμα sopor) es un estado severo de pérdida de consciencia. la coma [,] (del griego κόμμα corte) es un signo de puntuación. en matemáticas, al separador decimal entre… …   Wikipedia Español

  • coma — m. neurol. Estado de sopor profundo debido a una alteración del sistema reticular activador ascendente. El paciente ha perdido la sensibilidad, la movilidad y se muestra inconsciente pero conserva las funciones vegetativas (respiración,… …   Diccionario médico

  • coma — |ô| s. f. 1. Cabeleira. 2. Cabelo comprido. 3. Crina do cavalo. 4. Juba do leão. 5. Penas compridas que adornam a cabeça de certas aves. = PENACHO 6. Plumas do capacete. = PENACHO 7. Copa (do arvoredo). 8.  [Astronomia] Cabeleira de cometa. 9. … …   Dicionário da Língua Portuguesa

  • COMA — olim libertatis insigne, apud Gallos praesertim: unde Regalis capillitii ius priscis Francis, adeo celebre, apud Hottomannum, Francogalliae, c. 9. Aimoinum, de Gestis Francorum, l. 3. c. 61. etc. Certe omnes Galliae Reges usque ad Pippinum Caroli …   Hofmann J. Lexicon universale

  • Coma — Пётр Рогуцкий лидер группы COMA во время концерта в Мегаклу …   Википедия

  • coma — CÓMA, come, s.f. (fiz.) 1. Aberaţie a sistemelor optice care constă în apariţia unei imagini în formă de cometă. 2. Aberaţie a lentilelor electronice, caracterizată prin apariţia unei estompări spre periferia imaginii. – Din fr. coma. Trimis de… …   Dicționar Român

  • coma — sustantivo masculino 1. (no contable) Pérdida de conciencia prolongada en que permanecen algunos enfermos graves: El accidentado estuvo un mes en estado de coma. sustantivo femenino 1. Signo ortográfico de puntuación que indica una separación o… …   Diccionario Salamanca de la Lengua Española

  • Coma — Verbrauchermärkte GmbH Co KG Rechtsform GmbH Co KG Gründung 1977 Sitz Meppen Mitarbeiter ca. 1.400 Website …   Deutsch Wikipedia

  • Coma — Co ma, n. [L., hair, fr. Gr. ko mh.] 1. (Astron.) The envelope of a comet; a nebulous covering, which surrounds the nucleus or body of a comet. [1913 Webster] 2. (Bot.) A tuft or bunch, as the assemblage of branches forming the head of a tree; or …   The Collaborative International Dictionary of English

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