1/3. Visual evoked potential monitoring of optic nerve function during surgery.A study was made with intra-operative flash--visual evoked potentials (VEP) monitored using a fibre-optic/contact lens photo stimulator in 57 patients undergoing intra-orbital surgical procedures with potential risk to the optic nerve. The VEPs recorded under enflurane and nitrous oxide anaesthesia did not differ significantly in latency or amplitude from the pre-operative recordings. Transient abolition of the VEP was seen under many circumstances and did not correlate with the outcome of surgery, but absence of a previously normal VEP for more than four minutes during surgical manipulation within the orbit did show a correlation with post operative impairment of vision. The technique provides early warning to the surgeon of threats to the integrity of the optic nerve.- - - - - - - - - - ranking = 1keywords = anaesthesia (Clic here for more details about this article) |
2/3. Globe luxation in histiocytosis X.A boy with histiocytosis X, first diagnosed at the age of 9 months, presented at the age of 5 years with left globe luxation. Under general anaesthesia the globe was reduced and a temporary paracentral tarsorrhaphy carried out. He was started on a course of oral steroids. Two years later he had normal visual acuity, full ocular movements, and healthy fundi.- - - - - - - - - - ranking = 1keywords = anaesthesia (Clic here for more details about this article) |
3/3. Spontaneous retrobulbar haemorrhage following anaesthesia.A case is presented of retrobulbar haemorrhage following anaesthesia for the removal of a chicken bone from the pharynx of a patient with systemic lupus erythematosus. The aetiology and treatment are discussed.- - - - - - - - - - ranking = 5keywords = anaesthesia (Clic here for more details about this article) |