Internuclear ophthalmoplegia: Difference between revisions
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= Internuclear | {{SI}} | ||
{{Infobox medical condition | |||
== | | name = Internuclear ophthalmoplegia | ||
| image = [[File:Internuclear_ophthalmoplegia.jpg|250px]] | |||
| caption = Eye movement abnormalities in internuclear ophthalmoplegia | |||
| field = [[Neurology]] | |||
| symptoms = [[Diplopia]], [[nystagmus]], impaired [[horizontal eye movement]] | |||
| complications = [[Vision impairment]], [[dizziness]] | |||
| onset = Sudden or gradual | |||
| duration = Variable | |||
| causes = [[Multiple sclerosis]], [[stroke]], [[trauma]] | |||
| risks = [[Age]], [[hypertension]], [[diabetes mellitus]] | |||
| diagnosis = [[Clinical examination]], [[MRI]] | |||
| differential = [[Myasthenia gravis]], [[brainstem stroke]], [[thyroid eye disease]] | |||
| treatment = [[Physical therapy]], [[prism glasses]], [[medication]] | |||
| prognosis = Variable, depends on underlying cause | |||
| frequency = Common in [[multiple sclerosis]] patients | |||
}} | |||
'''Internuclear Ophthalmoplegia''' (INO) is a neurological disorder affecting eye movement. It is characterized by a deficit in the conjugate lateral gaze primarily involving impaired adduction in the affected eye. | '''Internuclear Ophthalmoplegia''' (INO) is a neurological disorder affecting eye movement. It is characterized by a deficit in the conjugate lateral gaze primarily involving impaired adduction in the affected eye. | ||
== Pathophysiology == | == Pathophysiology == | ||
INO occurs due to a lesion in the medial longitudinal fasciculus (MLF), an area in the brainstem that coordinates eye movements. The MLF connects the abducens nucleus of one side to the oculomotor nucleus on the opposite side. | INO occurs due to a lesion in the medial longitudinal fasciculus (MLF), an area in the brainstem that coordinates eye movements. The MLF connects the abducens nucleus of one side to the oculomotor nucleus on the opposite side. | ||
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== Clinical Presentation == | == Clinical Presentation == | ||
In INO, the affected eye shows impaired adduction when attempting to gaze contralaterally. For example: | In INO, the affected eye shows impaired adduction when attempting to gaze contralaterally. For example: | ||
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* Patients may experience horizontal diplopia, seeing two images side-by-side. | * Patients may experience horizontal diplopia, seeing two images side-by-side. | ||
* Interestingly, convergence is usually preserved in INO. | * Interestingly, convergence is usually preserved in INO. | ||
== Causes == | == Causes == | ||
Common causes of INO include: | Common causes of INO include: | ||
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* Infections | * Infections | ||
* Neurodegenerative diseases | * Neurodegenerative diseases | ||
== Diagnosis == | == Diagnosis == | ||
Diagnosis is primarily clinical, supported by: | Diagnosis is primarily clinical, supported by: | ||
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* Neurological examination | * Neurological examination | ||
* Imaging studies like MRI to identify lesions | * Imaging studies like MRI to identify lesions | ||
== Treatment and Management == | == Treatment and Management == | ||
Treatment of INO involves: | Treatment of INO involves: | ||
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* Symptomatic relief (e.g., using prism glasses for diplopia) | * Symptomatic relief (e.g., using prism glasses for diplopia) | ||
* Rehabilitation and physical therapy | * Rehabilitation and physical therapy | ||
== Prognosis == | == Prognosis == | ||
The prognosis of INO varies depending on the underlying cause. It may resolve spontaneously or persist, requiring ongoing management. | The prognosis of INO varies depending on the underlying cause. It may resolve spontaneously or persist, requiring ongoing management. | ||
== Epidemiology == | == Epidemiology == | ||
INO is more common in individuals with risk factors for stroke or multiple sclerosis, though it can occur in various demographic groups. | INO is more common in individuals with risk factors for stroke or multiple sclerosis, though it can occur in various demographic groups. | ||
== See Also == | == See Also == | ||
* [[Eye movement]] | * [[Eye movement]] | ||
* [[Multiple sclerosis]] | * [[Multiple sclerosis]] | ||
* [[Stroke]] | * [[Stroke]] | ||
== References == | == References == | ||
<references> | <references> | ||
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* Patel, S., & Green, M.T. (2022). ''INO: Diagnosis and Treatment Approaches''. Clinical Neurology Journal. 38(2), 112-118. | * Patel, S., & Green, M.T. (2022). ''INO: Diagnosis and Treatment Approaches''. Clinical Neurology Journal. 38(2), 112-118. | ||
</references> | </references> | ||
== External Links == | == External Links == | ||
* [https://www.aao.org/eye-health/diseases/internuclear-ophthalmoplegia American Academy of Ophthalmology - Internuclear Ophthalmoplegia] | * [https://www.aao.org/eye-health/diseases/internuclear-ophthalmoplegia American Academy of Ophthalmology - Internuclear Ophthalmoplegia] | ||
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[[Category:Neurological Disorders]] | [[Category:Neurological Disorders]] | ||
[[Category:Ophthalmology]] | [[Category:Ophthalmology]] | ||
{{stub}} | {{stub}} | ||
Latest revision as of 00:28, 8 April 2025
Editor-In-Chief: Prab R Tumpati, MD
Obesity, Sleep & Internal medicine
Founder, WikiMD Wellnesspedia &
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| Internuclear ophthalmoplegia | |
|---|---|
| File:Internuclear ophthalmoplegia.jpg | |
| Synonyms | N/A |
| Pronounce | N/A |
| Specialty | N/A |
| Symptoms | Diplopia, nystagmus, impaired horizontal eye movement |
| Complications | Vision impairment, dizziness |
| Onset | Sudden or gradual |
| Duration | Variable |
| Types | N/A |
| Causes | Multiple sclerosis, stroke, trauma |
| Risks | Age, hypertension, diabetes mellitus |
| Diagnosis | Clinical examination, MRI |
| Differential diagnosis | Myasthenia gravis, brainstem stroke, thyroid eye disease |
| Prevention | N/A |
| Treatment | Physical therapy, prism glasses, medication |
| Medication | N/A |
| Prognosis | Variable, depends on underlying cause |
| Frequency | Common in multiple sclerosis patients |
| Deaths | N/A |
Internuclear Ophthalmoplegia (INO) is a neurological disorder affecting eye movement. It is characterized by a deficit in the conjugate lateral gaze primarily involving impaired adduction in the affected eye.
Pathophysiology[edit]
INO occurs due to a lesion in the medial longitudinal fasciculus (MLF), an area in the brainstem that coordinates eye movements. The MLF connects the abducens nucleus of one side to the oculomotor nucleus on the opposite side.
Clinical Presentation[edit]
In INO, the affected eye shows impaired adduction when attempting to gaze contralaterally. For example:
- If the right eye is affected, adduction is limited when attempting to look left.
- The contralateral eye abducts with nystagmus.
- Patients may experience horizontal diplopia, seeing two images side-by-side.
- Interestingly, convergence is usually preserved in INO.
Causes[edit]
Common causes of INO include:
- Multiple sclerosis (most common in young adults)
- Stroke (more common in older patients)
- Trauma
- Infections
- Neurodegenerative diseases
Diagnosis[edit]
Diagnosis is primarily clinical, supported by:
- Patient history and symptom analysis
- Neurological examination
- Imaging studies like MRI to identify lesions
Treatment and Management[edit]
Treatment of INO involves:
- Addressing the underlying cause (e.g., immunotherapy for multiple sclerosis, stroke management)
- Symptomatic relief (e.g., using prism glasses for diplopia)
- Rehabilitation and physical therapy
Prognosis[edit]
The prognosis of INO varies depending on the underlying cause. It may resolve spontaneously or persist, requiring ongoing management.
Epidemiology[edit]
INO is more common in individuals with risk factors for stroke or multiple sclerosis, though it can occur in various demographic groups.
See Also[edit]
References[edit]
<references>
- Johnson, K.L., & Smith, A.R. (2023). Internuclear Ophthalmoplegia: Clinical Features and Management. Journal of Neuro-Ophthalmology. 43(1), 24-30.
- Patel, S., & Green, M.T. (2022). INO: Diagnosis and Treatment Approaches. Clinical Neurology Journal. 38(2), 112-118.
</references>
