Sixth nerve palsy: Difference between revisions
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{{Short description|A disorder affecting the sixth cranial nerve, causing eye movement issues}} | {{Short description|A disorder affecting the sixth cranial nerve, causing eye movement issues}} | ||
{{Infobox medical condition (new) | |||
== | | name = Sixth nerve palsy | ||
| synonyms = Lateral rectus palsy, VIth cranial nerve palsy, abducens nerve palsy | |||
| image = Gray785.png | |||
| caption = Figure showing the mode of innervation of the Recti medialis and lateralis of the eye. | |||
| pronounce = | |||
| field = [[Neurology]], [[Ophthalmology]] | |||
| symptoms = [[Diplopia]] (double vision), inability to move the eye outward (abduction), eye deviation inward (esotropia), [[head tilt]] to compensate | |||
| complications = Persistent double vision, impaired vision, compensatory head posture | |||
| onset = Sudden or gradual, depending on cause | |||
| duration = Variable (weeks to permanent) | |||
| types = Congenital, acquired (isolated or part of a syndrome) | |||
| causes = Microvascular ischemia (e.g., due to [[diabetes]] or [[hypertension]]), trauma, increased intracranial pressure, tumors, infections, [[multiple sclerosis]], [[meningitis]] | |||
| risks = Older age, diabetes, hypertension, head trauma, neoplastic diseases | |||
| diagnosis = [[Neurological examination]], [[MRI]], [[CT scan]], [[lumbar puncture]] (if infection or pressure is suspected) | |||
| differential = [[Myasthenia gravis]], thyroid eye disease, orbital trauma, internuclear ophthalmoplegia, third nerve palsy | |||
| prevention = Control of vascular risk factors; protective measures during head trauma | |||
| treatment = Depends on cause; may include observation, [[prism glasses]], eye patching, botulinum toxin injections, or surgery | |||
| medication = Based on underlying etiology (e.g., steroids for inflammation, antivirals for infections) | |||
| prognosis = Good for microvascular causes (usually resolves in 2–3 months); varies with other causes | |||
| frequency = Rare in general population; more common in individuals with vascular risk factors | |||
| deaths = Not directly, but underlying cause may be serious | |||
}} | |||
[[Image:Abducens palsy.jpg|thumb|Limitation of [[Abduction (kinesiology)|abduction]] of the right eye. This individual tries to look to his right, but the right eye fails to turn to the side|left]] | |||
'''Sixth nerve palsy''', also known as '''abducens nerve palsy''', is a neurological disorder that affects the sixth cranial nerve, known as the [[abducens nerve]]. This nerve is responsible for controlling the lateral rectus muscle, which is responsible for moving the eye outward, away from the nose. When this nerve is impaired, it results in a condition where the affected eye cannot move outward properly, leading to [[strabismus]] and [[diplopia]] (double vision). | '''Sixth nerve palsy''', also known as '''abducens nerve palsy''', is a neurological disorder that affects the sixth cranial nerve, known as the [[abducens nerve]]. This nerve is responsible for controlling the lateral rectus muscle, which is responsible for moving the eye outward, away from the nose. When this nerve is impaired, it results in a condition where the affected eye cannot move outward properly, leading to [[strabismus]] and [[diplopia]] (double vision). | ||
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== Causes == | == Causes == | ||
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Sixth nerve palsy can be caused by a variety of factors, including: | Sixth nerve palsy can be caused by a variety of factors, including: | ||
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* [[Strabismus]] | * [[Strabismus]] | ||
* [[Diplopia]] | * [[Diplopia]] | ||
== External links == | |||
{{Medical resources | |||
|OMIM = | | |||
|ICD10 = {{ICD10|H|49|2|h|49}} | | |||
|ICD9 = {{ICD9|378.54}} | | |||
|MedlinePlus = | | |||
|eMedicineSubj = oph | | |||
|eMedicineTopic = 158 | | |||
|DiseasesDB = 2868 | | |||
|MeshName = Sixth+Nerve+Palsy | | |||
|MeshNumber = C10.292.150 | | |||
}} | |||
{{Eye pathology}} | |||
{{DEFAULTSORT:Sixth Nerve Palsy}} | |||
{{stub}} | |||
[[Category:Disorders of ocular muscles, binocular movement, accommodation and refraction]] | |||
[[Category:Abducens nerve|Palsy]] | |||
[[Category:Neurological disorders]] | [[Category:Neurological disorders]] | ||
[[Category:Ophthalmology]] | [[Category:Ophthalmology]] | ||
[[Category:Cranial nerves]] | [[Category:Cranial nerves]] | ||
Latest revision as of 22:06, 23 March 2025
A disorder affecting the sixth cranial nerve, causing eye movement issues
| Sixth nerve palsy | |
|---|---|
| |
| Synonyms | Lateral rectus palsy, VIth cranial nerve palsy, abducens nerve palsy |
| Pronounce | |
| Field | Neurology, Ophthalmology |
| Symptoms | Diplopia (double vision), inability to move the eye outward (abduction), eye deviation inward (esotropia), head tilt to compensate |
| Complications | Persistent double vision, impaired vision, compensatory head posture |
| Onset | Sudden or gradual, depending on cause |
| Duration | Variable (weeks to permanent) |
| Types | Congenital, acquired (isolated or part of a syndrome) |
| Causes | Microvascular ischemia (e.g., due to diabetes or hypertension), trauma, increased intracranial pressure, tumors, infections, multiple sclerosis, meningitis |
| Risks | Older age, diabetes, hypertension, head trauma, neoplastic diseases |
| Diagnosis | Neurological examination, MRI, CT scan, lumbar puncture (if infection or pressure is suspected) |
| Differential diagnosis | Myasthenia gravis, thyroid eye disease, orbital trauma, internuclear ophthalmoplegia, third nerve palsy |
| Prevention | Control of vascular risk factors; protective measures during head trauma |
| Treatment | Depends on cause; may include observation, prism glasses, eye patching, botulinum toxin injections, or surgery |
| Medication | Based on underlying etiology (e.g., steroids for inflammation, antivirals for infections) |
| Prognosis | Good for microvascular causes (usually resolves in 2–3 months); varies with other causes |
| Frequency | Rare in general population; more common in individuals with vascular risk factors |
| Deaths | Not directly, but underlying cause may be serious |
Sixth nerve palsy, also known as abducens nerve palsy, is a neurological disorder that affects the sixth cranial nerve, known as the abducens nerve. This nerve is responsible for controlling the lateral rectus muscle, which is responsible for moving the eye outward, away from the nose. When this nerve is impaired, it results in a condition where the affected eye cannot move outward properly, leading to strabismus and diplopia (double vision).
Signs and Symptoms[edit]
The primary symptom of sixth nerve palsy is the inability to move the affected eye outward. This results in:
- Diplopia: Double vision, particularly when looking in the direction of the affected eye.
- Strabismus: Misalignment of the eyes, where the affected eye may turn inward.
- Head turn: Patients may turn their head to compensate for the misalignment and reduce double vision.
Causes[edit]
Sixth nerve palsy can be caused by a variety of factors, including:
- Trauma: Injury to the head or orbit can damage the abducens nerve.
- Vascular disorders: Conditions such as diabetes mellitus or hypertension can lead to microvascular ischemia affecting the nerve.
- Infections: Infections such as meningitis can cause inflammation and damage to the nerve.
- Tumors: Masses in the brain or near the nerve can compress it, leading to dysfunction.
- Idiopathic: In some cases, the cause of sixth nerve palsy is unknown.
Diagnosis[edit]
Diagnosis of sixth nerve palsy involves a thorough clinical examination and may include:
- Ophthalmologic examination: To assess eye movement and alignment.
- Neuroimaging: MRI or CT scan to identify any structural causes such as tumors or trauma.
- Blood tests: To check for underlying conditions like diabetes or infections.
Treatment[edit]
Treatment of sixth nerve palsy depends on the underlying cause:
- Observation: In cases where the cause is idiopathic or due to microvascular ischemia, the condition may resolve spontaneously over time.
- Prism glasses: To help alleviate double vision.
- Botulinum toxin injections: To temporarily paralyze the opposing muscle and improve alignment.
- Surgery: In cases where the palsy does not resolve, surgical intervention may be necessary to correct the eye alignment.
Prognosis[edit]
The prognosis for sixth nerve palsy varies depending on the cause. In cases related to microvascular issues, recovery is often complete within a few months. However, if the palsy is due to a tumor or significant trauma, the outcome may depend on the success of treating the underlying condition.
Related Pages[edit]
External links[edit]
