Glaucoma: what the neurologist needs to know.

Glaucoma is a progressive optic neuropathy resulting from pathological changes at the optic disc due to elevated intraocular pressure. Its diagnosis, treatment and follow-up are almost entirely conducted in ophthalmology clinics, with screening conducted by community optometrists. Despite this, neurologists may encounter glaucoma in both its acute presentation (as angle closure, presenting as acute headache) and its chronic forms (often as optic neuropathy of unknown cause). An awareness of the underlying pathological process, and the key distinguishing signs and symptoms, will allow neurologists to identify the glaucomatous process rapidly. Timely referral is essential as glaucoma invariably results in progressive visual loss without treatment. This review therefore condenses the wide field of glaucoma into a practical summary, aimed at practitioners with limited clinical experience of this ophthalmic condition.

Palinopsia.

Palinopsia is an uncommon but important neuro-ophthalmic condition. It can present with a range of visual phenomena and may be misdiagnosed as migraine or a functional disorder. The list of possible causes is long and includes structural cerebral lesions. We present a clinical case to illustrate the condition before reviewing different palinoptic subtypes and discussing how these may help clinicians to narrow the differential diagnosis.

Dr Gordon Plant's Festschrift Tidings.

We came together in March 2021 for a joyous celebration of Dr Gordon Plant's incredible career. This is a report of the meeting tidings.

Skull base aspergillosis in an immunocompetent elderly man with early response to steroid.

We report the case of a previously well 80-year-old man who presented with subacute bilateral painful optic neuropathy with initial response to corticosteroids but ultimately progressed to a fatal skull base syndrome. Initial presentation of steroid-responsive painful bilateral posterior optic neuropathy, preliminary normal enhanced MRI, normal cerebrospinal fluid and inflammatory markers indicated atypical optic neuritis. However, this progressed to a bilateral orbital apex syndrome with ophthalmoplegia and evidence of abnormal skull base enhancement on subsequent MRI. Biopsy of radiologically abnormal dura was non-diagnostic and negative for fungal stains. He deteriorated and died 8 months after initial presentation. At postmortem, fungal skull base infection was diagnosed. This case demonstrates that chronic skull base fungal infection can: (1) present in elderly immunocompetent patients, (2) show initial improvement with corticosteroids and (3) evade diagnosis on biopsy. We encourage a high index of suspicion for fungal skull base infection in similar cases.

Eye drop neurology.

Eye drops can help to diagnose and prevent complications of neurological disorders. Guttae ophthalmicae (eye drops) are generally safe because the drugs rarely achieve significant systemic concentrations, although there are rare exceptions. This article covers contemporary pharmacological pupil testing; how to dilate a pupil safely; common reasons why pupils do not respond to drops; and corneal lubrication to prevent complications of weak eye closure.

The effects of laparoscopic adjustable gastric banding on idiopathic intracranial hypertension.

The purpose of this study was to determine whether laparoscopic adjustable gastric banding has a role in the treatment of idiopathic intracranial hypertension. This pilot study was undertaken in a single, tertiary referral centre. Data on all patients with idiopathic intracranial hypertension that have undergone laparoscopic adjustable gastric banding in our unit were collected from our prospectively maintained bariatric database. Additional information was obtained via telephone questionnaires and review of medical records. Four female patient with a mean age of 32 years (range 29-39 years) and mean pre-operative body mass index of 46.1 kg/m(2) (range 38.2-54.0 kg/m(2)) underwent laparoscopic adjustable gastric banding between June 2006 and July 2009. At a mean follow-up of 19.8 months all four patients reported either total resolution of headache or significant improvement in headache, with a mean improvement in pain score of 76.3/100 (range 55-95) on a analogue pain score. Mean excess weight loss at follow-up was 64.1% (range 50.1-88.2%). There were no complications or mortality in this cohort. This study suggests that laparoscopic adjustable gastric banding represents an effective and safe treatment for idiopathic intracranial hypertension associated with morbid obesity. We have shown good results both in terms of symptom resolution and weight loss, whilst avoiding alimentary tract diversion procedures in these young female patients. A randomized, controlled trial can be justified on the basis of this initial pilot study.

Reversible grasp reflexes in normal pressure hydrocephalus.

We present two cases of normal pressure hydrocephalus in combination with grasp reflexes. In both cases the grasp reflexes disappeared following high volume cerebrospinal fluid removal. In one of the cases the grasp reflexes returned over a period of weeks but again resolved following definitive cerebrospinal fluid shunting surgery, and remained absent until final follow up at 9 months. We hypothesise that resolving grasp reflexes following high volume CSF removal has both diagnostic and prognostic value in normal pressure hydrocephalus, encouraging larger studies on the relevance of primitive reflexes in NPH.

Accidental carbon monoxide poisoning presenting without a history of exposure: a case report.

INTRODUCTION: Carbon monoxide poisoning is easy to diagnose when there is a history of exposure. When the exposure history is absent, or delayed, the diagnosis is more difficult and relies on recognising the importance of multi-system disease. We present a case of accidental carbon monoxide poisoning. CASE PRESENTATION: A middle-aged man, who lived alone in his mobile home was found by friends in a confused, incontinent state. Initial signs included respiratory failure, cardiac ischaemia, hypotension, encephalopathy and a rash, whilst subsequent features included rhabdomyolysis, renal failure, amnesia, dysarthria, parkinsonism, peripheral neuropathy, supranuclear gaze palsy and cerebral haemorrhage. Despite numerous investigations including magnetic resonance cerebral imaging, lumbar puncture, skin biopsy, muscle biopsy and electroencephalogram a diagnosis remained elusive. Several weeks after admission, diagnostic breakthrough was achieved when the gradual resolution of the patient's amnesia, encephalopathy and dysarthria allowed an accurate history to be taken for the first time. The patient's last recollection was turning on his gas heating for the first time since the spring. A gas heating engineer found the patient's gas boiler to be in a dangerous state of disrepair and it was immediately decommissioned. CONCLUSION: This case highlights several important issues: the bewildering myriad of clinical features of carbon monoxide poisoning, the importance of making the diagnosis even at a late stage and preventing the patient's return to a potentially fatal toxic environment, and the paramount importance of the history in the diagnostic method.

Plasma exchange in episodes of severe inflammatory demyelination of the central nervous system. A report of six cases.

The standard therapy for episodes of severe acute inflammatory demyelinating disease of the central nervous system is high dose intravenous corticosteroids. A small proportion of patients fail to improve with this regime and their prognosis can become grave. A recent sham controlled double blind crossover trial in this group of patients demonstrated a significant benefit from plasma exchange. We report six patients with severe acute steroid-insensitive inflammatory demyelinating disease of the central nervous system treated with plasma exchange. We observed a clear improvement in five of these six patients. Whilst complications of plasma exchange occurred these did not outweigh the benefits. Our study supports the use of plasma exchange in severe acute steroid-insensitive inflammatory disease of the central nervous system.