neurogenic deviations
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Questions and Answers

What is the primary function of the 6th nerve?

  • To cause contraction of the lateral rectus muscle to abduct the eye (correct)
  • To rotate the eye clockwise
  • To cause contraction of the medial rectus muscle to adduct the eye
  • To rotate the eye counterclockwise

    • The 6th nerve is susceptible to damage from tumours.

    True

    What are the four types of 6th nerve palsy?

    Isolated 6th nerve palsy, Cavernous sinus thrombosis, Carotid-cavernous fistulas, and Apex petrous syndrome

    The muscle sequence of the final stage of 6th nerve palsy would be the inhibition palsy of the contralateral _______.

    <p>LR (Lateral Rectus)</p> Signup and view all the answers

    Match the following types of 6th nerve palsy with their characteristics:

    <p>Isolated 6th nerve palsy = Peripheral microvascular ischaemic lesion Cavernous sinus thrombosis = First sign of 6th nerve palsy due to vascular/inflammation/trauma issue Carotid-cavernous fistulas = Results from abnormal communication between arterial/venous systems Apex petrous syndrome = Involvement of the 6th nerve with other nerves can cause an internal cavernous aneurysm</p> Signup and view all the answers

    What is the primary investigation method for 6th nerve palsy?

    <p>All of the above</p> Signup and view all the answers

    Recovery from 6th nerve palsy is dependent on the cause.

    <p>True</p> Signup and view all the answers

    What are the two treatment options for 6th nerve palsy?

    <p>Surgical and non-surgical</p> Signup and view all the answers

    What is the primary action of the lateral rectus muscle controlled by the 6th nerve?

    <p>Abduction of the eye</p> Signup and view all the answers

    All lesions that cause 6th nerve palsy are usually tumours, infections, trauma, and multiple sclerosis.

    <p>False</p> Signup and view all the answers

    What is a common symptom of 6th nerve palsy?

    <p>Headache</p> Signup and view all the answers

    The 6th nerve is particularly vulnerable to damage from lesions affecting the ______________________ pathway.

    <p>nerve</p> Signup and view all the answers

    Which type of 6th nerve palsy is often caused by abnormal communication between the arterial and venous systems?

    <p>Carotid-cavernous fistula</p> Signup and view all the answers

    Recovery from 6th nerve palsy usually occurs within 3-6 months.

    <p>True</p> Signup and view all the answers

    What is the primary purpose of checking intracranial pressure in 6th nerve palsy?

    <p>To diagnose and monitor the condition</p> Signup and view all the answers

    Match the following types of 6th nerve palsy with their characteristic features:

    <p>Isolated 6th nerve palsy = Peripheral microvascular ischaemic lesion Cavernous sinus thrombosis = Vascular/inflammation/trauma issue Carotid-cavernous fistula = Abnormal communication between arterial/venous systems Apex petrous syndrome = Involvement of the 6th nerve with other nerves</p> Signup and view all the answers

    What is the primary cause of 6th nerve palsy?

    <p>All of the above</p> Signup and view all the answers

    The 6th nerve is responsible for adducting the eye.

    <p>False</p> Signup and view all the answers

    What is the significance of checking intracranial pressure in 6th nerve palsy?

    <p>To rule out other causes of 6th nerve palsy</p> Signup and view all the answers

    The 6th nerve palsy is characterized by ______________ diplopia.

    <p>horizontal</p> Signup and view all the answers

    Match the following types of 6th nerve palsy with their characteristic features:

    <p>Isolated 6th nerve palsy = Peripheral microvascular ischaemic lesion. Cavernous sinus thrombosis = Vascular/inflammation/trauma issue. Carotid-cavernous fistulas = Abnormal communication between arterial/venous systems. Apex petrous syndrome = Involvement of the 6th nerve with other nerves.</p> Signup and view all the answers

    What is the usual time frame for recovery from isolated vascular 6th nerve palsy?

    <p>3-6 months</p> Signup and view all the answers

    All types of 6th nerve palsy are painful.

    <p>False</p> Signup and view all the answers

    What is the usual cause of Apex petrous syndrome?

    <p>Internal cavernous aneurysm</p> Signup and view all the answers

    Study Notes

    6th Nerve Palsy (VI)

    • The 6th nerve is responsible for contracting the lateral rectus muscle to abduct the eye and is susceptible to damage.
    • Damage to the 6th nerve path is often caused by tumors, infections, trauma, multiple sclerosis, and blood vessel disease (e.g., diabetes and hypertension).
    • Intracranial pressure should be checked in cases of 6th nerve palsy.
    • Symptoms of 6th nerve palsy include headache, nausea, vomiting, visual disturbance, papilloedema, pain around the eye, and diplopia.

    Signs and Stages

    • Signs of 6th nerve palsy include horizontal diplopia, esotropia, and limited abduction with AHP (towards the affected side).
    • The muscle sequence of the final stage is inhibition palsy of the contralateral LR (all 4 stages complete, neurogenic).

    Types of 6th Nerve Palsy

    • 4 types of 6th nerve palsy: ICCA
    • Isolated 6th nerve palsy:
      • Caused by peripheral microvascular ischemic lesion
      • Acute palsy (7-10 days)
      • Vascular risk factors: diabetes, hypertension, and cholesterol
      • Sometimes painful, with recovery within 3-6 months (observe monthly)
    • Cavernous sinus thrombosis:
      • First sign of 6th nerve palsy due to vascular/inflammation/trauma issue
    • Carotid-cavernous fistulas:
      • Results from abnormal communication between arterial/venous systems
      • Spontaneous occurrence, most frequent in elder patients
      • Sometimes painful, with ocular tension, red eye, torturous BV, and proptosis
    • Apex petrous syndrome:
      • Involvement of the 6th nerve with other nerves can cause an internal cavernous aneurysm
      • Slow progressive aneurysm, may become painful and rupture

    Investigations and Recovery

    • Investigations: CT, MRI, and cerebral angiography
    • Recovery dependent on cause: majority of isolated vascular 6 palsies recover within 6 months, with possible recurrence (usually on the same side)

    Treatment

    • Non-surgical:
      • Patching: occlusion of the good eye may lead to disorientation and vertigo, so sector-occlusion: nasal part of the good eye or temporal part of paretic eye
      • Fresnel prisms: only for small deviations
    • Surgical treatment options are also available

    6th Nerve Palsy (VI)

    • The 6th nerve is responsible for contracting the lateral rectus muscle to abduct the eye and is susceptible to damage.
    • Damage to the 6th nerve path is often caused by tumors, infections, trauma, multiple sclerosis, and blood vessel disease (e.g., diabetes and hypertension).
    • Intracranial pressure should be checked in cases of 6th nerve palsy.
    • Symptoms of 6th nerve palsy include headache, nausea, vomiting, visual disturbance, papilloedema, pain around the eye, and diplopia.

    Signs and Stages

    • Signs of 6th nerve palsy include horizontal diplopia, esotropia, and limited abduction with AHP (towards the affected side).
    • The muscle sequence of the final stage is inhibition palsy of the contralateral LR (all 4 stages complete, neurogenic).

    Types of 6th Nerve Palsy

    • 4 types of 6th nerve palsy: ICCA
    • Isolated 6th nerve palsy:
      • Caused by peripheral microvascular ischemic lesion
      • Acute palsy (7-10 days)
      • Vascular risk factors: diabetes, hypertension, and cholesterol
      • Sometimes painful, with recovery within 3-6 months (observe monthly)
    • Cavernous sinus thrombosis:
      • First sign of 6th nerve palsy due to vascular/inflammation/trauma issue
    • Carotid-cavernous fistulas:
      • Results from abnormal communication between arterial/venous systems
      • Spontaneous occurrence, most frequent in elder patients
      • Sometimes painful, with ocular tension, red eye, torturous BV, and proptosis
    • Apex petrous syndrome:
      • Involvement of the 6th nerve with other nerves can cause an internal cavernous aneurysm
      • Slow progressive aneurysm, may become painful and rupture

    Investigations and Recovery

    • Investigations: CT, MRI, and cerebral angiography
    • Recovery dependent on cause: majority of isolated vascular 6 palsies recover within 6 months, with possible recurrence (usually on the same side)

    Treatment

    • Non-surgical:
      • Patching: occlusion of the good eye may lead to disorientation and vertigo, so sector-occlusion: nasal part of the good eye or temporal part of paretic eye
      • Fresnel prisms: only for small deviations
    • Surgical treatment options are also available

    6th Nerve Palsy (VI)

    • The 6th nerve is responsible for contracting the lateral rectus muscle to abduct the eye and is susceptible to damage.
    • Damage to the 6th nerve path is often caused by tumors, infections, trauma, multiple sclerosis, and blood vessel disease (e.g., diabetes and hypertension).
    • Intracranial pressure should be checked in cases of 6th nerve palsy.
    • Symptoms of 6th nerve palsy include headache, nausea, vomiting, visual disturbance, papilloedema, pain around the eye, and diplopia.

    Signs and Stages

    • Signs of 6th nerve palsy include horizontal diplopia, esotropia, and limited abduction with AHP (towards the affected side).
    • The muscle sequence of the final stage is inhibition palsy of the contralateral LR (all 4 stages complete, neurogenic).

    Types of 6th Nerve Palsy

    • 4 types of 6th nerve palsy: ICCA
    • Isolated 6th nerve palsy:
      • Caused by peripheral microvascular ischemic lesion
      • Acute palsy (7-10 days)
      • Vascular risk factors: diabetes, hypertension, and cholesterol
      • Sometimes painful, with recovery within 3-6 months (observe monthly)
    • Cavernous sinus thrombosis:
      • First sign of 6th nerve palsy due to vascular/inflammation/trauma issue
    • Carotid-cavernous fistulas:
      • Results from abnormal communication between arterial/venous systems
      • Spontaneous occurrence, most frequent in elder patients
      • Sometimes painful, with ocular tension, red eye, torturous BV, and proptosis
    • Apex petrous syndrome:
      • Involvement of the 6th nerve with other nerves can cause an internal cavernous aneurysm
      • Slow progressive aneurysm, may become painful and rupture

    Investigations and Recovery

    • Investigations: CT, MRI, and cerebral angiography
    • Recovery dependent on cause: majority of isolated vascular 6 palsies recover within 6 months, with possible recurrence (usually on the same side)

    Treatment

    • Non-surgical:
      • Patching: occlusion of the good eye may lead to disorientation and vertigo, so sector-occlusion: nasal part of the good eye or temporal part of paretic eye
      • Fresnel prisms: only for small deviations
    • Surgical treatment options are also available

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    Description

    This quiz covers the 6th nerve, its functions, and the causes and symptoms of 6th nerve palsy, including tumors, infections, trauma, and more. Learn about the importance of checking intracranial pressure and the signs of 6th nerve damage.

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