Otosclerosis
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Otosclerosis From Wikipedia, the free encyclopedia
Jump to: navigation, search Otosclerosis Classification and external resources
ICD-10
H80.
ICD-9
387
Otosclerosis is an abnormal growth of bone of the middle ear which can result in hearing loss.
Contents [hide] • • • • • •
1 Clinical Description 2 Pathophysiology 3 Treatment 4 Famous patients 5 References in popular culture 6 Notes
•
7 External links
[edit] Clinical Description Chronic conductive hearing loss (CHL) is the finding in almost all cases of otosclerosis (in fact should a person present with sensorineural hearing loss they would likely never be diagnosed with otosclerosis). This usually will begin in one ear but will eventually affect both ears with a variable course. On audiometry, the hearing loss is characteristically low-frequency, with higher frequencies being affected later. Sensorineural hearing loss (SNHL) has also been noted in patients with otosclerosis; this is usually a high-frequency loss, and usually manifests late in the disease. Approximately 0.5% of the population will eventually be diagnosed with otosclerosis. Post mortem studies show that as many as 10% of people may have otosclerotic lesions
of their temporal bone, but apparently never had symptoms warranting a diagnosis. Whites are the most affected race, with the prevalence in the Black and Asian populations being much lower. Females are twice as likely as males to be affected. Usually noticeable hearing loss begins at middle-age, but can start much sooner. The hearing loss often grows worse during pregnancy.[1] The disease can be considered to be heritable, but its penetrance and the degree of expression is so highly variable that it may be difficult to detect an inheritance pattern. Most of the implicated genes are transmitted in an autosomal dominant fashion.
[edit] Pathophysiology The pathophysiology of otosclerosis is complex. The key lesions of otosclerosis are multifocal areas of sclerosis within the endochondral temporal bone. These lesions share some characteristics with Paget’s Disease, but they are not thought to be otherwise related. Histopathologic studies have all been done on cadaveric temporal bones, so only inferences can be made about progression of the disease histologically. This being said, it seems that the lesions go through an active “spongiotic” / hypervascular phase before developing into “sclerotic” phase lesions. There have been many genes and proteins identified that, when mutated, may lead to these lesions. Also there is mounting evidence that measles virus is present within the otosclerotic foci, implicating an infectious etiology (this has also been noted in Paget’s Disease). CHL in otosclerosis is caused by two main sites of involvement of the sclerotic (or scarlike) lesions. The best understood mechanism is fixation of the stapes footplate to the oval window of the cochlea. This greatly impairs movement of the stapes and therefore transmission of sound into the inner ear (“ossicular coupling”). Additionally the cochlea’s round window can also become sclerotic, and in a similar way impair movement of sound pressure waves through the inner ear (“acoustic coupling”). SNHL in otosclerosis is controversial. Over the past century, leading otologists and neurotologic researchers have argued whether the finding of SNHL late in the course of otosclerosis is due to otosclerosis or simply to typical presbycusis. There are certainly a few well documented instances of sclerotic lesions directly obliterating sensory structures within the cochlea and spiral ligament, which have been photographed and reported postmortem. Other supporting data includes a consistent loss of cochlear hair cells in patients with otosclerosis; these cells being the chief sensory organs of sound reception. A suggested mechanism for this is the release of hydrolytic enzymes into the inner ear structures by the spongiotic lesions.
[edit] Treatment Treatment of otosclerosis relies on two primary options: hearing aids (more recently including bone-conduction hearing aids) and a surgery called a stapedectomy. Hearing aids are usually very effective early in the course of the disease, but eventually a
stapedectomy may be required for definitive treatment. Early attempts at hearing restoration via the simple freeing the stapes from its sclerotic attachments to the oval window were met with temporary improvement in hearing, but the conductive hearing loss would almost always recur. A stapedectomy consists of removing a portion of the sclerotic stapes footplate and replacing it with an implant that is secured to the incus. This procedure restores continuity of ossicular movement and allows transmission of sound waves from the eardrum to the inner ear. A modern variant of this surgery called a stapedotomy, is performed by drilling a small hole in the stapes footplate with a microdrill or a laser, and the insertion of a piston-like prothesis. The success rate of either a stapedotomy or a stapedectomy depends greatly on the skill and the familiarity with the procedure of the surgeon.[2] Other less successful treatment includes fluoride administration, which theoretically becomes incorporated into bone and inhibits otosclerotic progression. This treatment cannot reverse conductive hearing loss, but may slow the progression of both the conductive and sensorineural components of the disease process. Recently, some success has been reported with bisphosphonate medications, which stimulate bone-deposition without stimulating bony destruction.
[edit] Famous patients The renowned German composer Beethoven was theorized to suffer from otosclerosis, although this is controversial.[3] Victorian journalist Harriet Martineau gradually lost her hearing during her young life, and later medical historians have diagnosed her with probably suffering from otosclerosis as well.[4] Howard Hughes the pioneering American aviator, engineer, industrialist, and film producer also suffered from otosclerosis.[5] Frankie Valli, lead singer of The Four Seasons, suffered from it in the 1970s, forcing him to "sing from memory" in the latter part of the decade (surgery restored most of his hearing by 1980).[6]
[edit] References in popular culture During the first three seasons of the CBS TV series CSI: Crime Scene Investigation, Gil Grissom suffered from otosclerosis, which he inherited from his mother. At the end of the show's third season, Grissom underwent a stapedectomy to correct it. New player for the Philadelphia Flyers in the 07-08 season, Steve Downie, suffers from otosclerosis. Dwayne Schneider, the building superintendent on "One Day at a Time", undergoes a stapedectomy to correct otosclerosis in one episode.
[edit] Notes
1. ^ De Souza, Christopher. Otosclerosis and Stapedectomy. New York: Thieme Medical Publishers, 2004. 2. ^ de Souza; Glassock (2004), Otosclerosis and Stapedectomy, ISBN 1588901696 3. ^ The Ludwig van Beethoven biography, http://www.kunstderfuge.com/bios/beethoven.html 4. ^ Mary Jo Deegan, "Making Lemonade: Harriet Martineau on Being Deaf, p. 4158 in Harriet Martineau: Theoretical and Methodological Perspectives, NY, NY: Routledge 2001 5. ^ Charles Higham, Howard Hughes: The Secret Life 6. ^ Fred Bronson, The Billboard Book of Number One Hits (3rd edition), Billboard Books 1992. big foot also had otosclerosis ISBN 0-8230-8298-0
[edit] External links NIH/Medline NIH/NIDCD eMedicine DDB 29289 Online 'Mendelian Inheritance in Man' (OMIM) 166800 - OTSC1 Online 'Mendelian Inheritance in Man' (OMIM) 605727 - OTSC2 Otosclerosis Patient Accounts and Support - Patient Support
• • • • • • •
[hide] v•d•e
Diseases of the ear and mastoid process (H60-H99, 380-389) External ear Otitis externa Middle ear and mastoid
Otitis media - Mastoiditis (Bezold's abscess, Gradenigo's syndrome) - Cholesteatoma - Perforated eardrum
Otosclerosis - Balance disorder - Ménière's disease Benign paroxysmal positional vertigo - Vestibular Inner ear neuronitis - Vertigo - Labyrinthitis - Perilymph fistula Superior canal dehiscence syndrome (SCDS) Hearing impairment
Conductive hearing loss - Sensorineural hearing loss (Central hearing loss, Presbycusis)
Other Tinnitus - Hyperacusis See also congenital Retrieved from "http://en.wikipedia.org/wiki/Otosclerosis" Categories: Otology
Views • • • •
Article Discussion Edit this page History
Personal tools •
Log in / create account
Navigation • • • • •
Main page Contents Featured content Current events Random article
Search
Interaction • • • • • •
About Wikipedia Community portal Recent changes Contact Wikipedia Donate to Wikipedia Help
Toolbox • • • • • • •
What links here Related changes Upload file Special pages Printable version Permanent link Cite this page
Languages •
Deutsch
• • • • • • •
Español Français Hrvatski Magyar Nederlands Polski Português
• •
This page was last modified on 10 October 2008, at 02:42. All text is available under the terms of the GNU Free Documentation License. (See Copyrights for details.) Wikipedia® is a registered trademark of the Wikimedia Foundation, Inc., a U.S. registered 501(c)(3) tax-deductible nonprofit charity. Privacy policy About Wikipedia Disclaimers
• • •
Otosclerosis From Wikipedia, the free encyclopedia
Jump to: navigation, search Otosclerosis Classification and external resources
ICD-10
H80.
ICD-9
387
Otosclerosis is an abnormal growth of bone of the middle ear which can result in hearing loss.
Contents [hide] • • • • • •
1 Clinical Description 2 Pathophysiology 3 Treatment 4 Famous patients 5 References in popular culture 6 Notes
•
7 External links
[edit] Clinical Description Chronic conductive hearing loss (CHL) is the finding in almost all cases of otosclerosis (in fact should a person present with sensorineural hearing loss they would likely never be diagnosed with otosclerosis). This usually will begin in one ear but will eventually affect both ears with a variable course. On audiometry, the hearing loss is characteristically low-frequency, with higher frequencies being affected later. Sensorineural hearing loss (SNHL) has also been noted in patients with otosclerosis; this is usually a high-frequency loss, and usually manifests late in the disease. Approximately 0.5% of the population will eventually be diagnosed with otosclerosis. Post mortem studies show that as many as 10% of people may have otosclerotic lesions
of their temporal bone, but apparently never had symptoms warranting a diagnosis. Whites are the most affected race, with the prevalence in the Black and Asian populations being much lower. Females are twice as likely as males to be affected. Usually noticeable hearing loss begins at middle-age, but can start much sooner. The hearing loss often grows worse during pregnancy.[1] The disease can be considered to be heritable, but its penetrance and the degree of expression is so highly variable that it may be difficult to detect an inheritance pattern. Most of the implicated genes are transmitted in an autosomal dominant fashion.
[edit] Pathophysiology The pathophysiology of otosclerosis is complex. The key lesions of otosclerosis are multifocal areas of sclerosis within the endochondral temporal bone. These lesions share some characteristics with Paget’s Disease, but they are not thought to be otherwise related. Histopathologic studies have all been done on cadaveric temporal bones, so only inferences can be made about progression of the disease histologically. This being said, it seems that the lesions go through an active “spongiotic” / hypervascular phase before developing into “sclerotic” phase lesions. There have been many genes and proteins identified that, when mutated, may lead to these lesions. Also there is mounting evidence that measles virus is present within the otosclerotic foci, implicating an infectious etiology (this has also been noted in Paget’s Disease). CHL in otosclerosis is caused by two main sites of involvement of the sclerotic (or scarlike) lesions. The best understood mechanism is fixation of the stapes footplate to the oval window of the cochlea. This greatly impairs movement of the stapes and therefore transmission of sound into the inner ear (“ossicular coupling”). Additionally the cochlea’s round window can also become sclerotic, and in a similar way impair movement of sound pressure waves through the inner ear (“acoustic coupling”). SNHL in otosclerosis is controversial. Over the past century, leading otologists and neurotologic researchers have argued whether the finding of SNHL late in the course of otosclerosis is due to otosclerosis or simply to typical presbycusis. There are certainly a few well documented instances of sclerotic lesions directly obliterating sensory structures within the cochlea and spiral ligament, which have been photographed and reported postmortem. Other supporting data includes a consistent loss of cochlear hair cells in patients with otosclerosis; these cells being the chief sensory organs of sound reception. A suggested mechanism for this is the release of hydrolytic enzymes into the inner ear structures by the spongiotic lesions.
[edit] Treatment Treatment of otosclerosis relies on two primary options: hearing aids (more recently including bone-conduction hearing aids) and a surgery called a stapedectomy. Hearing aids are usually very effective early in the course of the disease, but eventually a
stapedectomy may be required for definitive treatment. Early attempts at hearing restoration via the simple freeing the stapes from its sclerotic attachments to the oval window were met with temporary improvement in hearing, but the conductive hearing loss would almost always recur. A stapedectomy consists of removing a portion of the sclerotic stapes footplate and replacing it with an implant that is secured to the incus. This procedure restores continuity of ossicular movement and allows transmission of sound waves from the eardrum to the inner ear. A modern variant of this surgery called a stapedotomy, is performed by drilling a small hole in the stapes footplate with a microdrill or a laser, and the insertion of a piston-like prothesis. The success rate of either a stapedotomy or a stapedectomy depends greatly on the skill and the familiarity with the procedure of the surgeon.[2] Other less successful treatment includes fluoride administration, which theoretically becomes incorporated into bone and inhibits otosclerotic progression. This treatment cannot reverse conductive hearing loss, but may slow the progression of both the conductive and sensorineural components of the disease process. Recently, some success has been reported with bisphosphonate medications, which stimulate bone-deposition without stimulating bony destruction.
[edit] Famous patients The renowned German composer Beethoven was theorized to suffer from otosclerosis, although this is controversial.[3] Victorian journalist Harriet Martineau gradually lost her hearing during her young life, and later medical historians have diagnosed her with probably suffering from otosclerosis as well.[4] Howard Hughes the pioneering American aviator, engineer, industrialist, and film producer also suffered from otosclerosis.[5] Frankie Valli, lead singer of The Four Seasons, suffered from it in the 1970s, forcing him to "sing from memory" in the latter part of the decade (surgery restored most of his hearing by 1980).[6]
[edit] References in popular culture During the first three seasons of the CBS TV series CSI: Crime Scene Investigation, Gil Grissom suffered from otosclerosis, which he inherited from his mother. At the end of the show's third season, Grissom underwent a stapedectomy to correct it. New player for the Philadelphia Flyers in the 07-08 season, Steve Downie, suffers from otosclerosis. Dwayne Schneider, the building superintendent on "One Day at a Time", undergoes a stapedectomy to correct otosclerosis in one episode.
[edit] Notes
1. ^ De Souza, Christopher. Otosclerosis and Stapedectomy. New York: Thieme Medical Publishers, 2004. 2. ^ de Souza; Glassock (2004), Otosclerosis and Stapedectomy, ISBN 1588901696 3. ^ The Ludwig van Beethoven biography, http://www.kunstderfuge.com/bios/beethoven.html 4. ^ Mary Jo Deegan, "Making Lemonade: Harriet Martineau on Being Deaf, p. 4158 in Harriet Martineau: Theoretical and Methodological Perspectives, NY, NY: Routledge 2001 5. ^ Charles Higham, Howard Hughes: The Secret Life 6. ^ Fred Bronson, The Billboard Book of Number One Hits (3rd edition), Billboard Books 1992. big foot also had otosclerosis ISBN 0-8230-8298-0
[edit] External links NIH/Medline NIH/NIDCD eMedicine DDB 29289 Online 'Mendelian Inheritance in Man' (OMIM) 166800 - OTSC1 Online 'Mendelian Inheritance in Man' (OMIM) 605727 - OTSC2 Otosclerosis Patient Accounts and Support - Patient Support
• • • • • • •
[hide] v•d•e
Diseases of the ear and mastoid process (H60-H99, 380-389) External ear Otitis externa Middle ear and mastoid
Otitis media - Mastoiditis (Bezold's abscess, Gradenigo's syndrome) - Cholesteatoma - Perforated eardrum
Otosclerosis - Balance disorder - Ménière's disease Benign paroxysmal positional vertigo - Vestibular Inner ear neuronitis - Vertigo - Labyrinthitis - Perilymph fistula Superior canal dehiscence syndrome (SCDS) Hearing impairment
Conductive hearing loss - Sensorineural hearing loss (Central hearing loss, Presbycusis)
Other Tinnitus - Hyperacusis See also congenital Retrieved from "http://en.wikipedia.org/wiki/Otosclerosis" Categories: Otology
Views • • • •
Article Discussion Edit this page History
Personal tools •
Log in / create account
Navigation • • • • •
Main page Contents Featured content Current events Random article
Search
Interaction • • • • • •
About Wikipedia Community portal Recent changes Contact Wikipedia Donate to Wikipedia Help
Toolbox • • • • • • •
What links here Related changes Upload file Special pages Printable version Permanent link Cite this page
Languages •
Deutsch
• • • • • • •
Español Français Hrvatski Magyar Nederlands Polski Português
• •
This page was last modified on 10 October 2008, at 02:42. All text is available under the terms of the GNU Free Documentation License. (See Copyrights for details.) Wikipedia® is a registered trademark of the Wikimedia Foundation, Inc., a U.S. registered 501(c)(3) tax-deductible nonprofit charity. Privacy policy About Wikipedia Disclaimers
• • •
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