良性発作性頭位眩暈症 benign paroxysmal positional vertigo

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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2014/06/17 19:29:06」(JST)

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Benign paroxysmal positional vertigo (BPPV) is a disorder arising in the inner ear. Its symptoms are repeated episodes of positional vertigo, that is, of a spinning sensation caused by changes in the position of the head.^[1] BPPV is the most common cause of the symptoms of vertigo.^[2]

Classification

Vertigo, a distinct process sometimes confused with the broader term, dizziness, accounts for about six million clinic visits in the United States every year; between 17 and 42% of these patients eventually are diagnosed with BPPV.^[1] Other causes of vertigo include:

Motion sickness/motion intolerance: a disjunction between visual stimulation, vestibular stimulation, and/or proprioception
Visual exposure to nearby moving objects (examples of optokinetic stimuli include passing cars and falling snow)
Other diseases: (labyrinthitis, Ménière's disease, and migraine.^[3] etc.)

Signs and symptoms

Symptoms
- Vertigo: Spinning dizziness, which must have a rotational component.
- Short duration (paroxysmal): Lasts only seconds to minutes
- Positional in onset: Can only be induced by a change in position.
- Nausea is often associated
- Visual disturbance: It may be difficult to read or see during an attack due to associated nystagmus.
- Pre-syncope (feeling faint) or syncope (fainting) is unusual.
- Emesis (vomiting) is uncommon, but possible.

Many patients will report a history of vertigo as a result of fast head movements. Many patients are also capable of describing the exact head movements that provoke their vertigo.
- Rotatory (torsional) nystagmus, where the top of the eye rotates towards the affected ear in a beating or twitching fashion, which has a latency and can be fatigued (the vertigo should lessen with deliberate repetition of the provoking maneuver).
- Nystagmus should only last for 30 seconds to one minute.

Patients do not experience other neurological deficits such as numbness or weakness, and if these symptoms are present, a more serious etiology such as posterior circulation stroke or ischemia, must be considered.

The spinning sensation experienced from BPPV is usually triggered by movement of the head, will have a sudden onset, and can last anywhere from a few seconds to several minutes. The most common movements patients report triggering a spinning sensation are tilting their head upwards in order to look at something, and rolling over in bed.^[2]

Cause

Within the labyrinth of the inner ear lie collections of calcium crystals known as otoconia or otoliths. In patients with BPPV, the otoconia are dislodged from their usual position within the utricle and migrate over time into one of the semicircular canals (the posterior canal is most commonly affected due to its anatomical position). When the head is reoriented relative to gravity, the gravity-dependent movement of the heavier otoconial debris (colloquially "ear rocks") within the affected semicircular canal causes abnormal (pathological) fluid endolymph displacement and a resultant sensation of vertigo. This more common condition is known as canalithiasis.

In rare cases, the crystals themselves can adhere to a semicircular canal cupula rendering it heavier than the surrounding endolymph. Upon reorientation of the head relative to gravity, the cupula is weighted down by the dense particles thereby inducing an immediate and maintained excitation of semicircular canal afferent nerves. This condition is termed cupulolithiasis.

There is evidence in the dental literature that malleting of an osteotome during closed sinus floor elevation, otherwise known as osteotome sinus elevation or lift, transmits enough percussive and vibratory forces capable of detaching otoliths from their normal location and leading to the symptoms of BPPV.^[4]^[5]

It can be triggered by any action which stimulates the posterior semi-circular canal, including:

Tilting the head
Rolling over in bed
Looking up or under
Sudden head motion
Post head injury

BPPV may be made worse by any number of modifiers which may vary between individuals:

Changes in barometric pressure - patients often feel symptoms approximately two days before rain or snow
Lack of sleep (required amounts of sleep may vary widely)
Stress

BPPV is one of the most common vestibular disorders in patients presenting with dizziness; migraine is implicated in idiopathic cases. Proposed mechanisms linking the two are genetic factors and vascular damage to the labyrinth.^[6]

Although BPPV can occur at any age, it is most often seen in people over the age of 60.^[7] Besides aging, there are no major risk factors known for developing BPPV, although previous episodes of trauma to the head or inner ear infections known as labyrinthitis, may predispose individuals to future development of BPPV.^[2]

Diagnosis

The condition is diagnosed by the patient's history, and by performing the Dix-Hallpike maneuver and/or the roll test.^[8]^[9]

The Dix-Hallpike test is a common test performed by examiners to determine whether the posterior semicircular canal is involved.^[9] It involves a reorientation of the head to align the posterior semicircular canal (at its entrance to the ampulla) with the direction of gravity. This test will reproduce vertigo and nystagmus characteristic of posterior canal BPPV.^[8]

When performing the Dix-Hallpike test, patients are descended quickly to a supine position with the neck extended by the clinician performing the maneuver. For some patients, this maneuver may not be indicated and a modification may be needed that also targets the posterior semicircular canal. Such patients include those who are too anxious about eliciting the uncomfortable symptoms of vertigo and those who may not have the range of motion necessary to comfortably be in a supine position. Obesity can also present a challenge when performing this assessment. The modification involves the patient moving from a seated position to side-lying without their head extending off the examination table, such as with Dix-Hallpike. The head is rotated 45 degrees away from the side being tested and the eyes are examined for nystagmus. A positive test is indicated by patient report of a reproduction of vertigo and nystagmus. Both the Dix-Hallpike and the side-lying testing position have yielded similar results and as such the side-lying position can be used if the Dix-Hallpike cannot be performed easily.^[10]

The roll test can determine whether the horizontal semicircular canal is involved.^[8] The roll test requires the patient to be in a supine position with his/her head in 20° of cervical flexion. Then the examiner quickly rotates the head 90° to the left side, and checks for vertigo and nystagmus. This is followed by gently bringing the head back to the starting position. The examiner then quickly rotates the head 90° to the right side, and checks for vertigo and nystagmus.^[8] In this roll test, the patient may experience vertigo and nystagmus on both sides, but rotating towards the affected side will trigger a more intense vertigo. Similarly, when the head is rotated towards the affected side, the nystagmus will beat towards the ground and be more intense.^[9]

As mentioned above, both the Dix-Hallpike and roll test provoke the signs and symptoms in subjects suffering from archetypal BPPV. The signs and symptoms patients with BPPV experience are typically a short-lived vertigo, and observed nystagmus. In some patients, though rarely, the vertigo can persist for years. Assessment of BPPV is best done by a health professional skilled in management of dizziness disorders, commonly a physiotherapist, audiologist or other medical physician.

The nystagmus associated with BPPV has several important characteristics which differentiate it from other types of nystagmus.

Positional: the nystagmus occurs only in certain positions
Latency of onset: there is a 5-10 second delay prior to onset of nystagmus
Nystagmus lasts for 5–120 seconds
Visual fixation suppresses nystagmus due to BPPV
Rotatory/Torsional component is present or (in the case of lateral canal involvement) the nystagmus beats in either a geotropic (towards the ground) or ageotropic (away from the ground) fashion
Repeated stimulation, including via Dix-Hallpike maneuvers, cause the nystagmus to fatigue or disappear temporarily.

Although rare, CNS disorders can sometimes present as BPPV. A practitioner should be aware that if a patient whose symptoms are consistent with BPPV, but does not show improvement or resolution after undergoing different particle repositioning maneuvers, which are detailed in the Treatment section below, need to have a detailed neurological assessment and imaging performed to help identify the pathological condition.^[11]

Treatment

Two treatments have been found effective for relieving symptoms of posterior canal BPPV, the canalith repositioning procedure (CRP) or Epley maneuver,^[12] and the liberatory or Semont maneuver.^[1] The CRP employs gravity to move the calcium build-up that causes the condition.^[13] The particle repositioning maneuver can be performed during a clinic visit by health professionals or taught to patients to practice at home. In the Semont maneuver, patients themselves are able to achieve canalith repositioning.^[14] Both treatments, when performed by a health professional, appear to be equally effective. When practiced at home, the CRP is more effective than the Semont maneuver. The most effective repositioning treatment for posterior canal BPPV is the therapist-performed CRP combined with home practiced CRP.^[15]

The Epley maneuver (particle repositioning) does not address the actual presence of the particles (otoconia), rather it changes their location. The maneuver aims to move these particles from some locations in the inner ear which cause symptoms such as vertigo, and reposition them to where they do not cause these problems.

The Brandt-Daroff exercises may be prescribed by the clinician as a home treatment method usually in conjunction with particle repositioning maneuvers or in lieu of the particle repositioning maneuver. The exercise is a form of habituation exercise, designed to allow the patient to become accustomed to the position which causes the vertigo symptoms. The Brandt-Daroff exercises are performed in a similar fashion to the Semont maneuver; however, as the patient rolls onto the unaffected side, the head is rotated toward the affected side.^[16] The exercise is typically performed 3 times a day with 5-10 repetitions each time, until symptoms of vertigo have resolved for at least 2 days.^[8]

For the Lateral (Horizontal) canal, a separate maneuver has been used for productive results. It is unusual for the lateral canal to respond to the canalith repositioning procedure used for the posterior canal BPPV. Treatment is therefore geared towards moving the canalith from the lateral canal into the vestibule.^[17] The roll maneuver or its variations are used and involves rolling the patient 360 degrees in a series of steps to reposition the particles.^[11]^[18] This maneuver is generally performed by a trained clinician who begins seated at the head of the examination table with the patient supine^[19] There are four stages, each a minute apart and at the third position the horizontal canal is oriented in a vertical position with the patient's neck flexed and on forearm and elbows.^[19] When all four stages are completed, the head roll test is repeated and if negative treatment ceases.^[19]

Medical treatment with anti-vertigo medications may be considered in acute, severe exacerbation of BPPV, but in most cases are not indicated. These primarily include drugs of the anti-histamine and anti-cholinergic class, such as meclizine and scopolamine respectively. The medical management of vestibular syndromes has become increasingly popular over the last decade, and numerous novel drug therapies (including existing drugs with new indications), have emerged for the treatment of vertigo/dizziness syndromes. These drugs vary considerably in their mechanisms of action, with many of them being receptor or ion channel-specific. Among them, include betahistine or dexamethasone/gentamicin for the treatment of Ménière's disease, carbamazepine/oxcarbazepine for the treatment of paroxysmal dysarthria and ataxia in multiple sclerosis, metoprolol/topiramate or valproic acid/tricyclic antidepressant for the treatment of vestibular migraine, and 4-aminopyridine for the treatment of episodic ataxia type 2 and downbeat and upbeat nystagmus.^[20] These drug therapies offer symptomatic treatment, and do not affect the disease process or resolution rate. Medications may be used to suppress symptoms during the positioning maneuvers if the patient's symptoms are severe and intolerable. More dose-specific studies are required however, in order to determine the most effective drug(s) for both acute symptom relief and long term remission of the condition. For a complete list of these novel therapies and their associated target symptoms, follow the link below to the Informahealthcare website.^[20]

Surgical treatments, such as a semi-circular canal occlusion, do exist for BPPV but carry the same risk as any neurosurgical procedure. Surgery is reserved as a last resort option for severe and persistent cases which fail vestibular rehabilitation (including particle repositioning and habituation therapy).

Devices such as a head over heels "rotational chair" are available at some tertiary care centers^[21] Home devices, like the DizzyFIX, are also available for the treatment of BPPV and vertigo.^[22]

The Semont maneuver has a cure rate of 90.3%.^[23] It is performed as follows:

The patient is seated on a treatment table with their legs hanging off the side of the table. The therapist then turns the patient’s head towards the unaffected side 45 degrees.
The therapist then quickly tilts the patient so they are lying on the affected side. The head position is maintained, so their head is turned up 45 degrees. This position is maintained for 3 minutes. The purpose is to allow the debris to move to the apex of the ear canal.
The patient is then quickly moved so they are lying on the unaffected side with their head in the same position (now facing downwards 45 degrees). This position is also held for 3 minutes. The purpose of this position is to allow the debris to move toward the exit of the ear canal.
Finally, the patient is slowly brought back to an upright seated position. The debris should then fall into the utricle of the canal and their symptoms of vertigo should decrease or end completely. Some patients will only need one treatment, but others may need multiple treatments depending on the severity of their BPPV.

References

^ ^a ^b ^c Bhattacharyya N, Baugh RF, Orvidas L, Barrs, D, Bronston, L, Cass, S, Chalian, A, Desmond, A, Earll, J (2008). "Clinical practice guideline: benign paroxysmal positional vertigo" (PDF). Otolaryngol Head Neck Surg 139 (5 Suppl 4): S47–81. doi:10.1016/j.otohns.2008.08.022. PMID 18973840. Lay summary – AAO-HNS (2008-11-01).
^ ^a ^b ^c "Benign positional vertigo". A.D.A.M. Medical Encyclopedia. Retrieved 16 April 2014.
^ Buchholz, D. Heal Your Headache. New York:Workman Publishing;2002:74-75
^ Sammartino, G; Mariniello, M; Scaravilli, MS (2011). "Benign paroxysmal positional vertigo following closed sinus floor elevation procedure: Mallet osteotomes vs. Screwable osteotomes. A triple blind randomized controlled trial". Clinical oral implants research 22 (6): 669–72. doi:10.1111/j.1600-0501.2010.01998.x. PMID 21054553.
^ Kim, MS; Lee, JK; Chang, BS; Um, HS (2010). "Benign paroxysmal positional vertigo as a complication of sinus floor elevation". Journal of periodontal & implant science 40 (2): 86–9. doi:10.5051/jpis.2010.40.2.86. PMC 2872812. PMID 20498765.
^ Lempert, T.; Neuhauser, H. (2009). "Epidemiology of vertigo, migraine and vestibular migraine". Journal of Neurology 256 (3): 333–8. doi:10.1007/s00415-009-0149-2. PMID 19225823.
^ Mayo Clinic Staff (July 10, 2012). "Benign paroxysmal positional vertigo (BPPV)". Retrieved 16 April 2014.
^ ^a ^b ^c ^d ^e Schubert, M. C. (2007). Vestibular Disorders. In S. O’Sullivan & T. Schmitz (Eds.), Physical Rehabilitation (5th ed.) (pp. 999-1029). Philadelphia: F.A. Davis Company.^{[page needed]}
^ ^a ^b ^c Korres, SG; Balatsouras, DG (2004). "Diagnostic, pathophysiologic, and therapeutic aspects of benign paroxysmal positional vertigo". Otolaryngology--head and neck surgery : official journal of American Academy of Otolaryngology-Head and Neck Surgery 131 (4): 438–44. doi:10.1016/j.otohns.2004.02.046. PMID 15467614.
^ Cohen, HS (2004). "Side-lying as an alternative to the Dix-Hallpike test of the posterior canal". Otology & Neurotology 25 (2): 130–4. doi:10.1097/00129492-200403000-00008. PMID 15021771.
^ ^a ^b Bhattacharyya, N; Baugh, RF; Orvidas, L; Barrs, D; Bronston, LJ; Cass, S; Chalian, AA; Desmond, AL; Earll, JM (2008). "Clinical practice guideline: Benign paroxysmal positional vertigo". Otolaryngology--head and neck surgery : official journal of American Academy of Otolaryngology-Head and Neck Surgery 139 (5 Suppl 4): S47–81. doi:10.1016/j.otohns.2008.08.022. PMID 18973840.
^ Hunt, William T; Zimmermann, Eleanor F; Hilton, Malcolm P (2012). "Modifications of the Epley (canalith repositioning) maneuver for posterior canal benign paroxysmal positional vertigo (BPPV)". In Hilton, Malcolm P. Cochrane Database of Systematic Reviews. doi:10.1002/14651858.CD008675.pub2.
^ Von Brevern, M (2006). "Short-term efficacy of Epley's maneuver: A double-blind randomised trial". Journal of Neurology, Neurosurgery & Psychiatry 77 (8): 980. doi:10.1136/jnnp.2005.085894.
^ Radtke, A.; Von Brevern, M.; Tiel-Wilck, K.; Mainz-Perchalla, A.; Neuhauser, H.; Lempert, T. (2004). "Self-treatment of benign paroxysmal positional vertigo: Semont maneuver vs Epley procedure". Neurology 63 (1): 150–2. doi:10.1212/01.WNL.0000130250.62842.C9. PMID 15249626.
^ Helminski, J. O.; Zee, D. S.; Janssen, I.; Hain, T. C. (2010). "Effectiveness of Particle Repositioning Maneuvers in the Treatment of Benign Paroxysmal Positional Vertigo: A Systematic Review". Physical Therapy 90 (5): 663–78. doi:10.2522/ptj.20090071. PMID 20338918.
^ Vesely, DL; Chiou, S; Douglass, MA; McCormick, MT; Rodriguez-Paz, G; Schocken, DD (1996). "Atrial natriuretic peptides negatively and positively modulate circulating endothelin in humans". Metabolism: clinical and experimental 45 (3): 315–9. doi:10.1016/S0026-0495(96)90284-X. PMID 8606637.
^ <Please add first missing authors to populate metadata.>. doi:10.3410/M2-60.
^ Bhattacharyya, N; Baugh, R; Orvidas, L; Barrs, D; Bronston, L; Cass, S; Chalian, A; Desmond, A; Earll, J (2008). "Clinical practice guideline: Benign paroxysmal positional vertigo". Otolaryngology - Head and Neck Surgery 139 (5): S47–81. doi:10.1016/j.otohns.2008.08.022. PMID 18973840.
^ ^a ^b ^c Hornibrook, Jeremy (2011). "Benign Paroxysmal Positional Vertigo (BPPV): History, Pathophysiology, Office Treatment and Future Directions". International Journal of Otolaryngology 2011: 1. doi:10.1155/2011/835671.
^ ^a ^b Huppert, Doreen; Strupp, Michael; Mückter, Harald; Brandt, Thomas (2011). "Which medication do I need to manage dizzy patients?". Acta Oto-laryngologica 131 (3): 228–41. doi:10.3109/00016489.2010.531052. PMID 21142898.
^ Furman, JM; Cass, SP; Briggs, BC (1998). "Treatment of benign positional vertigo using heels-over-head rotation". Annals of Otology, Rhinology, and Laryngology 107 (12): 1046–53. PMID 9865636.
^ Beyea, Jason Atkins; Wong, Eric; Bromwich, Matthew; Weston, W Wayne; Fung, Kevin (2008). "Evaluation of a Particle Repositioning Maneuver Web-Based Teaching Module". The Laryngoscope 118 (1): 175–80. doi:10.1097/MLG.0b013e31814b290d. PMID 18251035.
^ Chen Y, Zhuang J, Zhang L, Li Y, Jin Z, Zhao Z, Zhao Y, Zhou H (September 2012). "Short-term efficacy of semont maneuver for benign paroxysmal positional vertigo: a double-blind randomized trial". Otol Neurotol 33 (7): 1127–30. doi:10.1097/mao.0b013e31826352ca.

External links

VEDA Vestibular Disorder Association webpage concerning BPPV
Benign Positional Vertigo. eMedicine at WebMD
MayoClinic
Parnes, LS; Agrawal, SK; Atlas, J (2003). "Diagnosis and management of benign paroxysmal positional vertigo (BPPV)". CMAJ : Canadian Medical Association journal = journal de l'Association medicale canadienne 169 (7): 681–93. PMC 202288. PMID 14517129.
Dizzytimes.com Online Community for Sufferers of Vertigo and Dizziness
Huppert, Doreen; Strupp, Michael; Mückter, Harald; Brandt, Thomas (2011). "Which medication do I need to manage dizzy patients?". Acta Oto-laryngologica 131 (3): 228–41. doi:10.3109/00016489.2010.531052. PMID 21142898.
Solomon, D (2000). "Benign Paroxysmal Positional Vertigo". Current treatment options in neurology 2 (5): 417–428. doi:10.1007/s11940-000-0040-z. PMID 11096767.
"Videos". in Radtke, A.; Von Brevern, M.; Tiel-Wilck, K.; Mainz-Perchalla, A.; Neuhauser, H.; Lempert, T. (2004). "Self-treatment of benign paroxysmal positional vertigo: Semont maneuver vs Epley procedure". Neurology 63 (1): 150–2. doi:10.1212/01.WNL.0000130250.62842.C9. PMID 15249626.

UpToDate Contents

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1. 良性発作性頭位めまい症 benign paroxysmal positional vertigo
2. 回転性めまいの治療 treatment of vertigo
3. 回転性めまいの病態生理、病因、および鑑別診断 pathophysiology etiology and differential diagnosis of vertigo
4. 小児および思春期における浮動性めまいの評価 evaluation of dizziness in children and adolescents
5. 前庭神経炎 vestibular neuritis

English Journal

A tangible head model showing semicircular canals for demonstrating the physical treatment for BPPV.

Fujisaka M1, Akaogi K2, Shojaku H1.
Acta oto-laryngologica.Acta Otolaryngol.2015 Dec;135(12):1212-8. doi: 10.3109/00016489.2015.1064546. Epub 2015 Aug 14.
CONCLUSIONS: It was shown that practicing with a tangible head model with semicircular canals is a useful educational tool for learning the physical treatment for BPPV.OBJECTIVES: To assess the efficacy of using a tangible head model with semicircular canals to teach the physical treatment for BPPV.
PMID 26271968

Use of betahistine in the treatment of peripheral vertigo.

Ramos Alcocer R1, Ledezma Rodríguez JG2, Navas Romero A3, Cardenas Nuñez JL4, Rodríguez Montoya V5, Deschamps JJ6, Liviac Ticse JA7.
Acta oto-laryngologica.Acta Otolaryngol.2015 Dec;135(12):1205-11. doi: 10.3109/00016489.2015.1072873. Epub 2015 Aug 6.
CONCLUSION: Clinical studies and meta-analyses demonstrated that betahistine is effective and safe in the treatment of Ménière's disease, BPPV (benign paroxysmal positional vertigo), vestibular neuronitis, and other types of peripheral vertigo.OBJECTIVES: The goal of this paper is to review the ph
PMID 26245698

Migraine is associated with an increased risk for benign paroxysmal positional vertigo: a nationwide population-based study.

Chu CH1, Liu CJ, Lin LY, Chen TJ, Wang SJ.
The journal of headache and pain.J Headache Pain.2015 Dec;16:62. doi: 10.1186/s10194-015-0547-z. Epub 2015 Jul 4.
BACKGROUND: There is evidence suggesting that migraine may be associated with vertigo. The aim of this study was to assess the risk of benign paroxysmal positional vertigo (BPPV), the most common form of vertigo, in patients with migraine using a population-based dataset.METHODS: The National Health
PMID 26141381

Japanese Journal

臨床聴神経腫瘍によって誘発されたと考えられる管内結石症が原因の良性発作性頭位めまい症例

晝間清,渡部涼子,新井智之 [他]
耳鼻咽喉科臨床 105(9), 817-820, 2012-09
NAID 40019424211

水平半規管型良性発作性頭位めまい症の仰臥位での眼振の方向と患側との関係について (渡辺行雄教授退任記念論文集)

大橋直樹
耳鼻咽喉科臨床. 補冊 (134), 14-17, 2012-07
NAID 40019372044

Related Pictures

★リンクテーブル★

リンク元	「良性発作性頭位眩暈症」「悪性持続性頭位めまい症」「benign paroxysmal positional vertigo」
関連記事	「BP」

「良性発作性頭位眩暈症」

Benign paroxysmal positional vertigo
	Classification and external resources
	Exterior of labyrinth of the inner ear.
ICD-10	H81.1
ICD-9	386.11
OMIM	193007
DiseasesDB	1344
MedlinePlus	001420
MeSH	D014717

　　[★]

英: benign paroxysmal cephalo-positional dizziness, benign paroxysmal positional vertigo, BPPV

[show details]

良性発作性頭位めまい症 : 約 48,300 件
良性発作性頭位眩暈症 : 約 14,500 件
良性発作性頭位めまい : 約 54,200 件
良性発作性頭位眩暈 : 約 149,000 件

「悪性持続性頭位めまい症」

　　[★]

英: malignant persistant positional vertigo, MPPV
関: BPPV

「benign paroxysmal positional vertigo」

　　[★] 良性発作性頭位眩暈症 BPPV

「BP」

　　[★]

[Bhattacharyya-1] Bhattacharyya N, Baugh RF, Orvidas L, Barrs, D, Bronston, L, Cass, S, Chalian, A, Desmond, A, Earll, J (2008). "Clinical practice guideline: benign paroxysmal positional vertigo" (PDF). Otolaryngol Head Neck Surg 139 (5 Suppl 4): S47–81. doi:10.1016/j.otohns.2008.08.022. PMID 18973840. Lay summary – AAO-HNS (2008-11-01).

[PubMed_Health-2] "Benign positional vertigo". A.D.A.M. Medical Encyclopedia. Retrieved 16 April 2014.

[3] Buchholz, D. Heal Your Headache. New York:Workman Publishing;2002:74-75

[4] Sammartino, G; Mariniello, M; Scaravilli, MS (2011). "Benign paroxysmal positional vertigo following closed sinus floor elevation procedure: Mallet osteotomes vs. Screwable osteotomes. A triple blind randomized controlled trial". Clinical oral implants research 22 (6): 669–72. doi:10.1111/j.1600-0501.2010.01998.x. PMID 21054553.

[5] Kim, MS; Lee, JK; Chang, BS; Um, HS (2010). "Benign paroxysmal positional vertigo as a complication of sinus floor elevation". Journal of periodontal & implant science 40 (2): 86–9. doi:10.5051/jpis.2010.40.2.86. PMC 2872812. PMID 20498765.

[6] Lempert, T.; Neuhauser, H. (2009). "Epidemiology of vertigo, migraine and vestibular migraine". Journal of Neurology 256 (3): 333–8. doi:10.1007/s00415-009-0149-2. PMID 19225823.

[MayoClinic-7] Mayo Clinic Staff (July 10, 2012). "Benign paroxysmal positional vertigo (BPPV)". Retrieved 16 April 2014.

[Schubert-8] Schubert, M. C. (2007). Vestibular Disorders. In S. O’Sullivan & T. Schmitz (Eds.), Physical Rehabilitation (5th ed.) (pp. 999-1029). Philadelphia: F.A. Davis Company.^{[page needed]}

[Korres-9] Korres, SG; Balatsouras, DG (2004). "Diagnostic, pathophysiologic, and therapeutic aspects of benign paroxysmal positional vertigo". Otolaryngology--head and neck surgery : official journal of American Academy of Otolaryngology-Head and Neck Surgery 131 (4): 438–44. doi:10.1016/j.otohns.2004.02.046. PMID 15467614.

[10] Cohen, HS (2004). "Side-lying as an alternative to the Dix-Hallpike test of the posterior canal". Otology & Neurotology 25 (2): 130–4. doi:10.1097/00129492-200403000-00008. PMID 15021771.

[Pmid-11] Bhattacharyya, N; Baugh, RF; Orvidas, L; Barrs, D; Bronston, LJ; Cass, S; Chalian, AA; Desmond, AL; Earll, JM (2008). "Clinical practice guideline: Benign paroxysmal positional vertigo". Otolaryngology--head and neck surgery : official journal of American Academy of Otolaryngology-Head and Neck Surgery 139 (5 Suppl 4): S47–81. doi:10.1016/j.otohns.2008.08.022. PMID 18973840.

[pmid22513962-12] Hunt, William T; Zimmermann, Eleanor F; Hilton, Malcolm P (2012). "Modifications of the Epley (canalith repositioning) maneuver for posterior canal benign paroxysmal positional vertigo (BPPV)". In Hilton, Malcolm P. Cochrane Database of Systematic Reviews. doi:10.1002/14651858.CD008675.pub2.

[13] Von Brevern, M (2006). "Short-term efficacy of Epley's maneuver: A double-blind randomised trial". Journal of Neurology, Neurosurgery & Psychiatry 77 (8): 980. doi:10.1136/jnnp.2005.085894.

[14] Radtke, A.; Von Brevern, M.; Tiel-Wilck, K.; Mainz-Perchalla, A.; Neuhauser, H.; Lempert, T. (2004). "Self-treatment of benign paroxysmal positional vertigo: Semont maneuver vs Epley procedure". Neurology 63 (1): 150–2. doi:10.1212/01.WNL.0000130250.62842.C9. PMID 15249626.

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