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CN IV palsy (Diagnosis (History (DH
Meds, allergies, FH
Stroke,…
CN IV palsy
Diagnosis
-
Investigations
Bloods
FBC, CRP, U+E, LFT,
clotting, glucose, lipids
Imaging
CT/MRI head (ischemia, SOL)
-
History
-
FH
Stroke, neurological
disease
PMH
Cardiac disease, head injury
SH
Living arrangements, social support,
smoking, alcohol
PC/HPC
TBI, stroke, other symptoms
Pathophysiology
Mechanism
Unapposed action of other muscles
Adducted eye cannot move down, stuck up
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Physiology
CN IV controls the superior rectus
Allows the eye to move in and down
(adducted eye to move down)
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Clinical presentation
-
Abnormal eye movements
-
Definition
Palsy of the trochlear nerve
(CN IV), supplying superior rectus
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