anosmia

無嗅覚症 　

WordNet

1. absence of the sense of smell (as by damage to olfactory nasal tissue or the olfactory nerve or by obstruction of the nasal passages)
2. having impaired sense of smell
3. relating to an impairment or loss of the sense of smell (同)anosmatic

Wikipedia preview

出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2015/05/24 11:36:40」(JST)

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Anosmia

ICD-10	R43.0
ICD-9	781.1
MeSH	D000857

Anosmia (/ænˈɒzmiə/) is the inability to perceive odor or a lack of functioning olfaction. Anosmia may be temporary, but traumatic anosmia can be permanent. Anosmia is due to an inflammation of the nasal mucosa, blockage of nasal passages or a destruction of one temporal lobe. Inflammation is due to chronic mucosa changes in the paranasal sinus lining and the middle and superior turbinates. Since anosmia causes inflammatory changes in the nasal passageways, it is treated by simply reducing the presence of inflammation. It can be caused by chronic meningitis and neurosyphilis that would increase intracranial pressure over a long period of time, and in some cases by ciliopathy including ciliopathy due to primary ciliary dyskinesia (Kartagener syndrome, Afzelius' syndrome or Siewert's syndrome). Many patients may experience unilateral anosmia, often as a result of minor head trauma. This type of anosmia is normally only detected if both of the nostrils are tested separately. Using this method of testing each nostril separately will often show a reduced or even completely absent sense of smell in either one nostril or both, something which is often not revealed if both nostrils are simultaneously tested.

A related term, hyposmia, refers to a decreased ability to smell, while hyperosmia refers to an increased ability to smell. Some people may be anosmic for one particular odor. This is known as "specific anosmia". The absence of the sense of smell from birth is called Congenital Anosmia.

Diagnosis

Anosmia can be diagnosed by doctors by using acetylcysteine tests. Doctors will begin with a detailed elicitation of history. Then the doctor will ask for any related injuries in relation to anosmia which could include upper respiratory infections or head injury. Psychophysical Assessment of order and taste identification can be used to identity anosmia. A nervous system examination is performed to see if the cranial nerves are damaged. The diagnosis as well as the degree of impairment can now be tested much more efficiently and effectively than ever before thanks to "smell testing kits" that have been made available as well as screening tests which use materials that most clinics would readily have. Occasionally, after accidents, there is a change in a patient's sense of smell. Particular smells that were present before are no longer present. On occasion, after head traumas, there are patients who have unilateral anosmia. The sense of smell should be tested individually in each nostril.

Many cases of congenital anosmia remain unreported and undiagnosed. Since the disorder is present from birth the individual may have little or no understanding of the sense of smell, hence is unaware of the deficit. It may also lead to reduction of appetite.

Presentation

Anosmia can have a number of harmful effects. Patients with sudden onset anosmia may find food less appetizing, though congenital anosmics rarely complain about this, and none report a loss in weight. Loss of smell can also be dangerous because it hinders the detection of gas leaks, fire, and spoiled food. The common view of anosmia as trivial can make it more difficult for a patient to receive the same types of medical aid as someone who has lost other senses, such as hearing or sight.

Losing an established and sentimental smell memory (e.g. the smell of grass, of the grandparents' attic, of a particular book, of loved ones, or of oneself) has been known to cause feelings of depression.

Loss of olfaction may lead to the loss of libido, though this usually does not apply to congenital anosmics.

Often people who have congenital anosmia report that they pretended to be able to smell as children because they thought that smelling was something that older/mature people could do, or did not understand the concept of smelling but did not want to appear different from others. When children get older, they often realize and report to their parents that they do not actually possess a sense of smell, often to the surprise of their parents.

A study done on patients suffering from anosmia found that when testing both nostrils, there was no anosmia revealed; however, when testing each nostril individually, tests showed that the sense of smell was usually affected in only one of the nostrils as opposed to both. This demonstrated that unilateral anosmia is not uncommon in anosmia patients.

Causes

A temporary loss of smell can be caused by a blocked nose or infection. In contrast, a permanent loss of smell may be caused by death of olfactory receptor neurons in the nose or by brain injury in which there is damage to the olfactory nerve or damage to brain areas that process smell (see olfactory system). The lack of the sense of smell at birth, usually due to genetic factors, is referred to as congenital anosmia. Family members of the patient suffering from congenital anosmia are often found with similar histories; this suggests that the anosmia may follow an autosomal dominant pattern. Anosmia may very occasionally be an early sign of a degenerative brain disease such as Parkinson's disease and Alzheimer's disease. Another specific cause of permanent loss could be from damage to olfactory receptor neurons because of use of certain types of nasal spray; i.e., those that cause vasoconstriction of the nasal microcirculation. To avoid such damage and the subsequent risk of loss of smell, vasoconstricting nasal sprays should be used only when absolutely necessary and then for only a short amount of time. Non-vasoconstricting sprays, such as those used to treat allergy-related congestion, are safe to use for prescribed periods of time. Anosmia can also be caused by nasal polyps. These polyps are found in people with allergies, histories of sinusitis & family history. Individuals with cystic fibrosis often develop nasal polyps.

Amiodarone is a drug used in the treatment of arrhythmias of the heart. A clinical study performed demonstrated that the use of this drug induced anosmia in some patients. Although rare, there was a case in which a 66-year-old male was treated with Amiodarone for ventricular tachycardia. After the use of the drug he began experiencing olfactory disturbance, however after decreasing the dosage of Amiodarone, the severity of the anosmia decreased accordingly hence correlating the use of Amiodarone to the development of anosmia.

List of causes

• Upper respiratory tract infection (e.g., sinusitis or the common cold)
• Nasal polyps
• Idiopathic hypogonadotropic hypogonadism
• Hypothyroidism
• Head trauma, damage to the ethmoid bone
• Dementia with Lewy bodies
• Tumors of the frontal lobe
• Fibromyalgia
• Multiple sclerosis
• Hypoglycaemia
• Diabetes
• Asthma or Allergy
• Hayfever
• Chronic obstructive pulmonary disease (COPD)
• Long term alcoholism
• Cushing's syndrome
• Exposure to a chemical that burns the inside of the nose
• Stroke
• Epilepsy
• Radiation therapy to the head and neck
• Liver or kidney disease
• Parkinson's disease
• Alzheimer's disease
• Toxins (especially acrylates, methacrylates and cadmium)
• Old age
• Kallmann syndrome
• Primary ciliary dyskinesia
• Post-perfusion syndrome
• Laryngectomy with permanent tracheostomy
• Esthesioneuroblastoma is an exceedingly rare cancerous tumor that originates in or near the olfactory nerve. Symptoms are anosmia (loss of sense of smell) often accompanied by chronic sinusitis.
• Intranasal drug use
• Samter's triad
• Foster Kennedy syndrome
• Cadmium poisoning
• Smoking
• Neurotropic virus
• Schizophrenia
• Pernicious anemia
• Zinc deficiency
• Bell's Palsy or nerve paralysis and damage
• Idiopathic intracranial hypertension
• Suprasellar meningioma
• Refsum's disease
• Adrenergic agonists or withdrawal from alpha blockers (vasoconstriction)
• Sarcoidosis
• Zinc-based intranasal cold products, including remedies labelled as "homeopathic"
• Chronic atrophic rhinitis
• Paget's disease of bone
• Cerebral aneurysm
• Granulomatosis with polyangiitis
• Primary amoebic meningoencephalitis
• Myasthenia gravis

This list is incomplete; you can help by expanding it.

Treatment

Though anosmia caused by brain damage cannot be treated, anosmia caused by inflammatory changes in the mucosa may be treated with glucocorticoids. Reduction of inflammation through the use of oral glucocorticoids such as prednisone, followed by long term topical glucocorticoid nasal spray, would easily and safely treat the anosmia. A prednisone regimen is adjusted based on the degree of the thickness of mucosa, the discharge of oedema and the presence or absence of nasal polyps. However, the treatment is not permanent and may have to be repeated after a short while. Together with medication, pressure of the upper area of the nose must be mitigated through aeration and drainage.

Anosmia caused by a nasal polyp may be treated by steroidal treatment or removal of the polyp.

There have also been cases where the use of acupuncture have successfully treated anosmia.

Although very early in development, gene therapy has restored a sense of smell in mice with congenital anosmia when caused by ciliopathy. In this case a genetic condition had affected cilia in their bodies which normally enabled them to detect air-borne chemicals, and an adenovirus was used to implant a working version of the IFT88 gene into defective cells in the nose, which restored the cilia and allowed a sense of smell.

Zicam controversy

On June 16, 2009, the US Food and Drug Administration sent a warning letter to Matrixx Initiatives, manufacturer of an over-the-counter nasal spray for the common cold, Zicam. The FDA cited complaints that the product caused anosmia. The manufacturer strongly denies these allegations, but has recalled the product and has stopped selling it.

In fact, Matrixx has received more than 800 reports of Zicam users who were losing their sense of smell but did not provide those reports to the FDA.

Associated conditions

• Dysosmia
• Kallmann syndrome
• Parkinson's disease
• Fibromyalgia
• Multiple sclerosis
• Asthma
• Diabetes
• Chronic obstructive pulmonary disease
• Epilepsy
• Schizophrenia
• Vitamin B12 deficiency
• Stroke
• Hypothyroidism
• Kidney disease
• Liver disease
• Head injury
• Brain tumour
• Alzheimer's disease
• Zinc deficiency
• Cadmium Poisoning
• Holoprosencephaly
• Primary amoebic meningoencephalitis caused by Naegleria fowleri
• Refsum disease
• CHARGE syndrome
• Ageusia

This list is incomplete; you can help by expanding it.

See also

• Phantosmia
• Hyperosmia
• Hyposmia
• Parosmia

References

Further reading

• Blodgett, Bonnie (2010). Remembering Smell: A Memoir of Losing - and Discovering - the Primal Sense. Houghton Mifflin Harcourt. ISBN 978-0-618-86188-0. 
• Birnbaum, Molly (2011). Season to Taste: How I Lost my Sense of Smell and Found my Way. Ecco. ISBN 0-06-191531-9
• DeVere, Ronald & Calvert, Marjorie (2010). Navigating Smell and Taste Disorders. Demos Health. ISBN 978-1-932603-96-5
• Gilbert, Avery (2008). What the Nose Knows.The Science of Scent in Everyday Life. Crown. ISBN 978-1-4000-8234-6
• Herz, Rachel (2007). The Scent of Desire. Discovering Our Enigmatic Sense of Smell. HarperCollins. ISBN 978-0-06-082538-6
• Tafalla, Marta (2010). Nunca sabrás a qué huele Bagdad (You will never know the smell of Bagdad) (in Spanish). Autonomous University of Barcelona. ISBN 978-84-490-2611-9.  - Novel dealing with congenital anosmia.
• Keller A, Malaspina D (2013). "Hidden consequences of olfactory dysfunction: a patient report series". BMC Ear, Nose, and Throat Disorders 13 (1): 8. doi:10.1186/1472-6815-13-8. PMC 3733708. PMID 23875929. 
• Tafalla M (September 2013). "A world without the olfactory dimension". Anatomical Record 296 (9): 1287–96. doi:10.1002/ar.22734. PMID 23907763. 
• Tafalla, Marta (2013). "Anosmic Aesthetics", in: Estetika. The Central European Journal of Aesthetics, Prag, issue 1/2013, pp 53–80.
• Wilson, Donald A. & Stevenson, Richard J. (2006). Learning to Smell. Olfactory Perception from Neurobiology to Behavior. The Johns Hopkins University Press. ISBN 978-0-8018-8368-2

External links

• What does the lack of a sense of smell do to flavour perception? Guardian.co.uk
• Cardiff University Anosmia resource site
• Monell Chemical Senses Center

UpToDate Contents

全文を閲覧するには購読必要です。 To read the full text you will need to subscribe.

• 1. 味覚および嗅覚障害の評価および治療 evaluation and treatment of taste and smell disorders
• 2. 味覚および嗅覚障害の解剖学および病因 anatomy and etiology of taste and smell disorders
• 3. 大脳皮質基底核変性症 corticobasal degeneration
• 4. 粘膜悪性黒色腫 mucosal melanoma
• 5. 脳振盪および軽度外傷性脳損傷 concussion and mild traumatic brain injury

Japanese Journal

• Giant Skull Base Atypical Meningioma Presenting With Rapidly Progressive Impaired Consciousness Caused by Severe Venous Congestion : Case Report

• YAMAGUCHI Shigeru,TERASAKA Shunsuke,KOBAYASHI Hiroyuki,ASAOKA Katsuyuki,MURATA Junichi,HOUKIN Kiyohiro
• Neurologia medico-chirurgica = 神経外科 51(11), 789-792, 2011-11-15
• … The extensive brain edema completely disappeared after tumor resection, and the patient fully recovered without neurological deficits except anosmia and small visual field defect. …
• NAID 10030030454

• Anterior Interhemispheric Approach for Tuberculum Sellae Meningioma

• Terasaka Shunsuke,Asaoka Katsuyuki,Kobayashi Hiroyuki,Yamaguchi Shigeru
• Neurosurgery 68(1), ons84-ons89, 2011-03
• … Other non-visual complications, such as rhinoliquorrhea, venous infarction and permanent anosmia occurred in three patients. …
• NAID 120003837184

• Unilateral Anterior Interhemispheric Approach for Anterior Communicationg Artery Aneurysms With Horizontal Head Position : Technical Note

• HAYASHI Nakamasa,SATO Hikari,AKIOKA Naoki,KUROSAKI Kunikazu,HORI Satoshi,ENDO Shunro
• Neurologia medico-chirurgica = 神経外科 51(2), 160-163, 2011-02-15
• … No patients exhibited anosmia after surgery. …
• NAID 10028105104

Related Links

• Anosmia | Define Anosmia at Dictionary.com

Anosmia definition, absence or loss of the sense of smell. See more. Thesaurus Translate Puzzles & Games Reference Word of the Day Blog Slideshows Apps by Dictionary My Account Log Out Log In follow Dictionary.com ...

• anosmia - definition of anosmia by Medical dictionary

Anosmia Definition The term anosmia means lack of the sense of smell. It may also refer to a decreased sense of smell. Ageusia, a companion word, refers to a lack of taste sensation. Patients who actually have anosmia may ...

Related Pictures

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★リンクテーブル★

リンク元	「無嗅覚症」「cacosmia」「paraosmia」「smell disorder」「olfaction disorder」

「無嗅覚症」

　　[★]

英

anosmia

同

嗅覚消失 anodmia、アノスミー

嗅覚脱失、無嗅覚症

関

嗅覚

[show details]

無嗅覚 : 約 3,930 件
無嗅覚症 : 約 15,700 件
無臭覚 : 約 861 件
無臭覚症 : 約 71 件
嗅覚消失 : 約 1,180 件
臭覚障害 : 約 13,400 件

• カルマン症候群：無嗅覚症＋低ゴナドトロピン性性腺機能低下症

「cacosmia」

　　[★]

異臭症、異常嗅覚、悪臭症

関

anosmia、dysosmia、olfaction disorder、paraosmia、smell disorder

「paraosmia」

　　[★]

• 嗅覚錯誤

関

anosmia、cacosmia、dysosmia、olfaction disorder、parosmia、smell disorder

「smell disorder」

　　[★]

嗅覚障害

関

anosmia、cacosmia、dysosmia、olfaction disorder、paraosmia

「olfaction disorder」

　　[★]

• 嗅覚障害

関

anosmia、cacosmia、dysosmia、paraosmia、smell disorder