PubMed Health⌕ Search

Biomedical subjects

A K Demetriades

Publications and source records attributed to A K Demetriades.

7 recordsLinked to original sources
PubMed2005

Does posterior fossa decompression improve oculomotor and vestibulo-ocular manifestations in Chiari 1 malformation?

BACKGROUND: Oculomotor and vestibulo-ocular manifestations are associated with Chiari 1 malformation. Reports of the results of decompression of CM1 in resolution of these manifestations are limited. METHODS: A retrospective review of case notes were undertaken from Jan 1998 to March 2003 of all the cases undergoing posterior fossa decompressions by the senior author. Forty patients were identified of which 12 had oculomotor and vestibulo-ocular manifestations. RESULTS: Oculomotor and vestibulo-ocular symptoms were present in seven patients and eleven patients had clinical signs. There were only 2 patients who had symptoms and no objective findings. There was complete resolution of oculomotor and vestibulo-ocular manifestations in 8/12 patients and partial improvement in another one, leading to improvement in 9/12 patients. The mean time span to complete resolution was 15.5 months (range 3-71 months). CONCLUSION: Posterior fossa decompression appears to be highly effective in causing complete resolution of disabling oculomotor and vestibule-ocular manifestations in most cases of CM1.

Adolescent↗
PubMed2005

Low cost, high risk: accidental nutmeg intoxication.

Nutmeg poisoning is rare but probably underreported and should be considered in recreational substance users with acute psychotic symptoms as well as central nervous system neuromodulatory signs that may mimic in part an anticholinergic hyperstimulation.

Adolescent↗
PubMed1999

Arterial baroreflex control during mild-to-moderate nitrous oxide narcosis.

We hypothesized that light-to-moderate inert gas narcosis might play a role in bradycardia in divers by altering sensitivity or response dynamics of arterial baroreflexes. Carotid-cardiac and carotid-mean arterial pressure (MAP) baroreflex response curves were generated by applying multiple levels of neck pressure and suction. Seven healthy volunteers were studied during air breathing (control) and during inhalation of 39% nitrous oxide (N2O). Baseline (pre-stimulus) heart rate (HR) and MAP were not altered by N2O. Range, threshold level, saturation level, and delay of responses did not differ between conditions. For hypertensive stimuli, sensitivity of responses did not differ between air control and N2O inhalation, but for hypotensive stimuli, maximal response gain for HR tended to be reduced with N2O inhalation (P = 0.054). Our results speak against inert gas narcosis as a primary mechanism for hyperbaric bradycardia, but it remains possible that an attenuation of tachycardic responses to hypotensive stimuli plays a role.

Adult↗