Cranial nerve VI palsy after dural-arachnoid puncture

Area of Science:

• Neurology
• Ophthalmology
• Neurosurgery

Background:

• Dural-arachnoid puncture can lead to rare but significant cranial nerve (CN) VI injuries.
• These injuries manifest as diplopia or lateral rectus palsy, impacting eye movement and gaze.

Purpose of the Study:

• To review the literature on CN VI injury following dural-arachnoid puncture.
• To elucidate the mechanism, presentation, and management of this neurological complication.

Main Methods:

• Literature review of studies concerning CN VI injury post-dural-arachnoid puncture.
• Analysis of proposed injury mechanisms, clinical presentations, and treatment outcomes.

Main Results:

• The primary mechanism involves cerebrospinal fluid leakage, causing intracranial hypotension and brainstem displacement.
• This displacement results in tractional injury to CN VI, leading to demyelination and functional deficits.
• Symptoms, often accompanied by postdural puncture headache, can appear 1 day to 3 weeks post-puncture and resolve over weeks to months.

Conclusions:

• Minimizing dural puncture trauma with small-gauge, noncutting needles may reduce the risk of CN VI injury.
• Prompt epidural blood patch administration is recommended for ocular symptoms to mitigate morbidity and prevent progression.