Ageusia

Ageusia

SignSymptom infobox
Name = Ageusia
ICD10 = ICD10|R|43|2|r|40
ICD9 = ICD9|781.1

Ageusia (pronounced ay-GOO-see-uh) is the loss of taste functions of the tongue, particularly the inability to detect sweetness, sourness, bitterness, saltiness, and umami (the taste of monosodium glutamate). It is sometimes confused for anosmia - a loss of the sense of smell. Because the tongue can only indicate texture and differentiate between sweet, sour, bitter, salty, and umami most of what is perceived as the sense of taste is actually derived from smell. True aguesia is relatively rare compared to hypogeusia — a partial loss of taste — and dysgeusia — a distortion or alteration of taste.

Diagnosis

In order to discover the extent of the ageusia, a scientist attempts to discern the minimum level of a chemical that a patient can detect by taste. Patients may also be asked to compare various concentrations of chemicals in order that the doctor may ascertain what level of intensity that the patient can differentiate. Various methods are used, including the "sip, spit, and rinse" test as well as direct application of chemicals to the tongue.

Causes


=Neurological da

Tissue damage to the nerves that support the tongue can cause ageusia, especially damage to the lingual nerve and the glossopharyngeal nerve. The lingual nerve passes taste for the front two-thirds of the tongue and the glossopharyngeal nerve passes taste for the back third of the tongue. Neurological disorders such as Bell's palsy, Familial dysautonomia, and Multiple sclerosis cause similar problems to nerve damage, as do certain infectious conditions like primary amoeboid meningoencephalopathy. The lingual nerve (which is a branch of the trigeminal V3 nerve, but carries taste sensation back to the chorda tympani nerve to the geniculate ganglion of the facial nerve) can also be damaged during otologic surgery, causing a feeling of metal taste.

Problems with the endocrine system

Deficiency of vitamin B3 (Niacin) and zinc can cause problems with the endocrine system, which may cause taste loss or alteration. Disorders of the endocrine system, such as Cushing's syndrome, hypothyroidism and diabetes mellitus, can cause similar problems. Ageusia can also be caused by medicinal side-effects from antirheumatic drugs such as penicillamine, antiproliferative drugs such as cisplatin, ACE inhibitors, and other drugs including azelastine, clarithromycin and zopiclone.

Other causes

Local damage and inflammation that interferes with the taste buds or local nervous system such as that stemming from radiation therapy, glossitis, tobacco abuse, and denture use also cause ageusia. Other known causes include loss of taste sensitivity from aging (causing a difficulty detecting salty or bitter taste), anxiety disorder, cancer, renal failure and liver failure.

ources

* MedTerms Online Medical Dictionary. [http://www.medterms.com/script/main/art.asp?articlekey=9664 "Ageusia"] . Retrieved April 15, 2005.
* Family Practice Notebook. [http://www.fpnotebook.com/ENT195.htm "Taste Sensation"] . Retrieved April 15, 2005.
* Massachusetts Eye and Ear Infirmary. [http://www.meei.harvard.edu/patient/taste.php "Taste Disorders"] . Retrieved April 15, 2005.


Wikimedia Foundation. 2010.

Игры ⚽ Поможем решить контрольную работу

Look at other dictionaries:

  • ageusia — f. patol. Falta total o parcial del sentido del gusto. Medical Dictionary. 2011. ageusia falta del sentido del …   Diccionario médico

  • ageusia — s. f. Ageustia …   Dicionário da Língua Portuguesa

  • ageusia — (De a 2 y el gr. γεῦσις, gusto). f. Pérdida total de la capacidad de apreciar sabores …   Diccionario de la lengua española

  • Ageusia — La ageusia es la pérdida o disminución considerable del sentido del gusto. Las alteraciones del gusto se describen como sabor metálico, sabor fétido, sabor alterado o pérdida completa del sabor; algunas veces (3 a 12 %) se acompañan de… …   Wikipedia Español

  • ageusia — ► sustantivo femenino MEDICINA Falta total o parcial del sentido del gusto. * * * ageusia. (De a 2 y el gr. γεῦσις, gusto). f. Pérdida total de la capacidad de apreciar sabores. * * * ► femenino …   Enciclopedia Universal

  • ageusia — skonio nejutimas statusas Aprobuotas sritis žemės ūkio ir maisto produktų sauga ir kokybė apibrėžtis Jautrumo skonio dirgikliams nebuvimas. Gali būti visiškas arba dalinis, nuolatinis arba laikinas. atitikmenys: angl. ageusia pranc. ageusie, f… …   Lithuanian dictionary (lietuvių žodynas)

  • ageusia — ageusic /euh gyooh zik, sik/, adj. /euh gyooh zee euh, zhee euh, zheuh/, n. Pathol. loss or impairment of the sense of taste. Also, ageustia /euh gyooh stee euh/. [1840 50; < NL, equiv. to A 6 + geus (var. s. of Gk geúesthai to taste) + ia Y3] *… …   Universalium

  • ageusia — noun /əˈɡjuːzɪə,æˈɡjuːzɪə/ a) Absence of the sense of taste. b) Partial or complete loss of the sense of taste. See Also: ageusiac …   Wiktionary

  • ageusia — Loss or absence of the sense of taste. It may be: 1) general to all tastants (total), partial to some tastants, or specific to one or more tastants; 2) due to transport disorders (in access to the interior of the taste bud) or sensorineural… …   Medical dictionary

  • ageusia — a·geu·sì·a s.f. TS med. perdita o riduzione del senso del gusto {{line}} {{/line}} DATA: 1892. ETIMO: der. di geusia con 1a , cfr. gr. ágeustos senza sapore, gusto …   Dizionario italiano

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”