CN6 - Abducens nerve

Question 1

Definition

Answer 1

A neurological disorder that affects the function of the abducens nerve, which controls the lateral rectus muscle of the eye.

Question 2

Aetiology/ causes

Answer 2

Head trauma
Tumors
Vascular disorders

Infections, inflammation, or other neurological conditions.

Question 3

Risk factors

Answer 3

The risk factors for abducens nerve palsy are not well established, but it has been associated with hypertension, diabetes, and other vascular risk factors.

Question 4

Epidemiology/ Population affected

Answer 4

Abducens nerve palsy is relatively uncommon, with an estimated incidence of 0.9-2.3 cases per 100,000 persons per year.

It affects both sexes equally and is more commonly seen in adults, with a peak incidence in the fifth and sixth decades of life.

Question 5

Clinical presentation

Answer 5

The most common symptom of abducens nerve palsy is horizontal diplopia (double vision), which is worse when looking towards the affected side.

Other symptoms may include difficulty moving the affected eye in certain directions or an eye that appears to be turned inward

Question 6

Prognosis

Answer 6

The prognosis for abducens nerve palsy depends on the underlying cause and the extent of nerve damage. In some cases, the condition may resolve on its own without any treatment, while in other cases, treatment may be necessary to manage the symptoms.

Question 7

DDX

Answer 7

Myasthenia gravis
Thyroid eye disease
Internuclear ophthalmoplegia