Christopher H. Gibbons

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Twenty-eight patients with sensory complaints of unknown etiology had repeated skin biopsies. Patients with large nerve fiber swellings on initial biopsy showed a decline in epidermal nerve fiber density on repeated biopsies (p < 0.05 within group; p < 0.05 vs those without swellings). Patients without nerve fiber swellings did not have changes in nerve(More)
Anabolic-androgenic steroid (AAS) effects on brain reward were investigated in male rats with electrodes implanted in the lateral hypothalamus using the rate-frequency curve shift paradigm of brain stimulation reward. In the first experiment, treatment for 2 weeks with the AAS methandrostenolone had no effect on either the reward or performance components(More)
OBJECTIVE To evaluate a novel method to quantify the density of nerve fibers innervating sweat glands in healthy control and diabetic subjects, to compare the results to an unbiased stereologic technique, and to identify the relationship to standardized physical examination and patient-reported symptom scores. METHODS Thirty diabetic and 64 healthy(More)
We present preliminary experiments of a binary-switch, static-grid typing interface making use of varying language model contributions. Our motivation is to quantify the degree to which language models can make the simplest scanning interfaces – such as showing one symbol at a time rather than a scanning a grid – competitive in terms of typing speed. We(More)
OBJECTIVE To develop a novel assessment of sudomotor function. BACKGROUND Postganglionic sudomotor function is currently evaluated using the quantitative sudomotor axon reflex test (QSART) or silicone impressions. We hypothesize that high-resolution digital photography has advanced sufficiently to allow quantitative direct and indirect reflex testing of(More)
OBJECTIVE To determine the effects of topical application of capsaicin on cutaneous autonomic nerves. METHODS Thirty-two healthy subjects underwent occlusive application of 0.1% capsaicin cream (or placebo) for 48 hours. Subjects were followed for 6 months with serial assessments of sudomotor, vasomotor, pilomotor, and sensory function with simultaneous(More)
OBJECTIVE To investigate the prevalence, symptoms, and neurophysiologic features of delayed orthostatic hypotension (OH). METHODS Blood pressures (BP) were measured at 1-minute intervals on 230 patients during 60 degrees head-up tilt for 45 minutes and standing for 5 minutes. OH was defined as a sustained fall in BP (>or=20 mm Hg systolic or >or=10 mm Hg(More)
Coeliac disease is associated with numerous neurological manifestations including cerebellar ataxia, myelopathy, myopathy, and peripheral neuropathy. This report describes four patients who presented subacutely with presyncope and postural nausea. All four patients had biopsy proven coeliac disease with dysautonomia present on autonomic evaluation. These(More)
The authors report a 46-year-old woman with antibodies to the nicotinic acetylcholine receptor (NiAchR) of the autonomic ganglia. She presented with severe orthostatic intolerance refractory to treatment with midodrine, fludrocortisone, erythropoietin, vasopressin, salt, and fluid loading. Addition of L-threo-3,4-dihidroxyphenylserine (L-DOPS) substantially(More)