Biomedical subjects
P Eustace
Publications and source records attributed to P Eustace.
Effect of anaesthesia on intraocular blood flow.
Pulsatile ocular blood flow, intraocular pressure, systemic blood pressure, and heart rate was measured in two groups of 15 patients. One received lignocaine 1.5 mg/kg intravenously prior to induction. There was a significant increase in intraocular pressure after suxamethonium, which was not associated with any rise in ocular blood flow. Both the IOP and ocular blood flow increased significantly after tracheal intubation. A rise in ocular blood flow reflects the stress response associated with intubation. Lignocaine failed to attenuate either response.
Intermittent downbeat nystagmus secondary to vermian arachnoid cyst with associated obstructive hydrocephalus.
A 27-year-old man presented with a history of dizziness and intermittent vertical oscillopsia after oblique extension of the head and neck, following a neck injury 2 years previously. He had no other symptoms of cerebellar or brainstem dysfunction. On examination, an intermittent downbeat nystagmus lasting about fifty seconds was elicited by head extension and rotation. Radiologic examination showed slight lateral instability of the odontoid on lateral rotation, and computed tomography brain scan with Iopamidol 300 (Niopam) contrast revealed a 5-cm vermian arachnoid cyst in the posterior fossa with obstructive hydrocephalus. Removal of the cyst cured the nystagmus.
Slit lamp ophthalmodynamometry.
A short clinical trial of the 'Dynoptor' Slit Lamp Ophthalmodynamometer has shown it to be a practical instrument. A mean O.A.P. of 52.3 mm/hg has been recorded.
Convergence retraction nystagmus.
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Pituitary apoplexy in an ectopic pituitary tumour.
A case report of a patient with unilateral visual loss, due to infarction in an ectopic pituitary tumour, is presented. Good return of vision followed surgical removal of the tumour.
Hypertensive retinopathy: a cause of decreased visual acuity in children.
Hypertensive retinopathy may present atypically in children. Delays in diagnosis may result in permanent visual loss, as demonstrated in three cases we saw.