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Biomedical subjects

R Hyde

Publications and source records attributed to R Hyde.

17 recordsLinked to original sources
PubMed1998

How would patients prefer to spend the waiting time before their operations?

Many surgical patients are anxious while waiting to go to the operating theatre in spite of the best preparation with drugs, information and reassurance. It is possible that patients could be more comfortable if allowed a choice of activities before operations. The objective of this study was to find out how pre-operative patients might prefer to occupy their time. We distributed 200 questionnaires to elective surgery patients and 184 (92%) were available for analysis. Of the respondents, 54.1% wanted to be slightly sleepy, 72.0% preferred not to be fast asleep and 57.2% preferred not to be wide awake. Reading (56.8%), listening to music (57.1%) and chatting with other patients (39.9%) were preferred activities. It might be appropriate to ask patients how sedated they would wish to be before their surgery and perhaps have alternatives to sedation available.

Adult↗
PubMed1998

Use of 'Diprifusor' in anaesthesia for ophthalmic surgery.

A technique of balanced anaesthesia involving propofol infusions and a rapidly metabolised opioid offers advantages over traditional anaesthetic techniques for eye surgery. The most appropriate mode of delivery of propofol is by a 'Diprifusor' target controlled infusion system. This paper discusses the use of a 'Diprifusor' target controlled infusion system for eye surgery. Published data are reviewed and the results of a retrospective analysis of 138 successive eye surgery patients are presented.

Adult↗
PubMed1994

Clinical and immunological effect of intravesical interleukin-2 on superficial bladder cancer.

Using immunocytochemical techniques the pattern of T cell markers and MHC antigens on peripheral blood mononuclear cells, and tumour biopsies of patients with superficial bladder cancer before and after intravesical human recombinant interleukin-2 (rhuIL-2) therapy (three cases at 1 MIU, four cases at 18 MIU and two cases at 54 MIU), was investigated. There was a slight but significant increase in the total number of circulating leucocytes, harvested from blood using density gradient technique, after intravesical rhuIL-2 treatment. Thus the mean +/- SD of seven cases before and after (more than 30 days of) IL-2 were 1.24 +/- 0.32 x 10(9)/l and 1.50 +/- 0.46 x 10(9)/l respectively (t-test, P = 0.032). However, this was substantially less than in samples collected after subcutaneously (six cases) and intravenously (seven cases) administering rhuIL-2, the results of which were 1.09 +/- 0.46 x 10(9)/l versus 2.22 +/- 0.68 x 10(9)/l (P = 0.016) and 0.84 x 10(9)/l versus 2.3 x 10(9)/l (P = 0.004) respectively. There was no demonstrable alteration in the percentage of cells positive for CD3, CD4, CD8, CD25 or CD56 in peripheral blood or urine populations in six patients treated with intravesical IL-2, or the pattern of MHC class I or II expression on tumour biopsies before and after treatment. Though this could have been a reflection of the fact that most of the cases had normal class I expression, there was one tumour with complete loss and one tumour with very low expression among the three cases showing stroma positivity for HLA-A3 antigens. Neither of these was altered by IL-2 treatment, nor was class II antigen expression, which was positive in five of nine cases before treatment. Given the lack of the expected major immunological changes and the poor clinical responses (one of nine complete responses lasted 3 months), it is concluded that the schedule has not produced an adequate dose intensity to induce lymphocyte activation and alternative schedules based on those developed from systemic treatment need exploration.

Administration, Intravesical↗
PubMed1991

The effect of the uptake of particles on the chemotaxis of polymorphonuclear leucocytes in-vitro.

The relationship between the phagocytic uptake of latex microspheres (1.1 microns diam.) and the mobility of rat polymorphonuclear leucocytes (PMNLs) has been investigated in-vitro. The movement of PMNLs was found to be independent of the uptake of particles but about half of the PMNLs were not receptive to the chemo-attractant N-formylmethionyleucylphenylalanine. However, the uptake of particles was greater when particle/cell ratios were high and the greatest number of particles were carried into a cellulose nitrate filter by chemotaxis at the highest particle/cell ratio of 30:1.

Animals↗
PubMed1989

The transport of microspheres from the gastro-intestinal tract to inflammatory air pouches in the rat.

The distribution of latex microspheres (1.1 microns diam) has been investigated in-vivo, as a potential passive targeted system for the treatment of inflammation. Microspheres administered orally were found in the circulation and in inflamed tissues and exudates of inflammatory air pouches in rats. Oral absorption was also found in a rabbit. Particles administered directly into the circulation also penetrated into the air pouch tissues and fluids. The possibility of using microspheres as a passive targeted system for the treatment of inflammation is discussed.

Administration, Oral↗
PubMed1987

Analysis of structural requirements for the absorption of drugs and macromolecules from the nasal cavity.

An octapeptide and a protein, of molecular weights 800 and 34,000, respectively, were found to have nasal bioavailabilities of 73 and 0.6%, respectively, in the rat. This data, combined with reported values for 23 other compounds, indicated good availability without adjuvants for all molecules up to 1000 molecular weight (mean 70%, SD between compounds 26%, n = 15) with a decline in availability above this value. The relationship between absorption and molecular weight was modeled assuming competition between constant clearance from the nasal cavity and molecular weight-dependent transport through the mucosa. Deviations of absorption from values predicted by this model did not correlate with factors such as charge, hydrophobicity, or susceptibility to aminopeptidases, but the relative absorption of cyclic and cross-linked peptides and proteins was significantly greater than that of linear peptides. It is argued that the most likely route for transport is through junctions between cells and that surface-active adjuvants (MW 6000) which markedly enhance insulin uptake may act by rendering hydrophobic areas of contact of the junctional proteins temporarily hydrophilic. The nasal route is suitable for efficient, rapid delivery of many molecules of molecular weight less than 1000. With the use of adjuvants, this limit can be extended to at least 6000 and possibly much higher.

Absorption↗
PubMed1987

Effects of sodium 5-methoxysalicylate on macromolecule absorption and mucosal morphology in a vascularly perfused rat gut preparation in vivo.

The effect of sodium 5-methoxysalicylate on absorption was assessed by measurement of the appearance of test compounds in the portal blood output of a perfused rat gut model. The test compounds were a hexapeptide analogue of somatostatin, insulin, and horseradish peroxidase. Considerable amounts of sodium 5-methoxysalicylate were present in the portal blood 10 min after intraduodenal administration. When co-administered with sodium 5-methoxysalicylate (60 mg), a marked increase in the concentrations of the test substances occurred at t = 15 min which lasted for a further 15 min. Quantities of less than 60 mg had much reduced adjuvant effects. In control experiments with no adjuvant, the concentrations of the test substances remained low throughout the 1-h period of blood collection. After the administration of 60 mg of sodium 5-methoxysalicylate, slight mucosal damage was apparent at 10 min. This became progressively worse with time and, at 1 h, extensive mucosal stripping had occurred. The results suggest, although they do not prove, that apparent adjuvant effects in the small intestine may be a direct consequence of serious mucosal damage. This means that care must be taken in the investigation of adjuvant properties to exclude the possibility that an observed increase in transport is due to gross loss of integrity of the membrane.

Animals↗
PubMed1987

Induction of the hepatic mixed-function oxidases by Aroclor 1254 in the hamster: comparison of Aroclor-induced rat and hamster preparations in the activation of pre-carcinogens in the Ames test.

Hepatic microsomal mixed-function oxidase activities and the metabolic activation of chemical carcinogens to mutagens in the Ames test were investigated using Aroclor 1254-induced rat and hamster preparations. Benzphetamine N-demethylase, NADPH-cytochrome c reductase and cytochromes P-450 and b5 were induced in both animals to the same extent by pre-treatment with Aroclor. However, the O-deethylation of ethoxyresorufin was markedly induced in the rat (147-fold) but only modestly in the hamster (3-fold). 1,2-Benzanthracene and 4-aminobiphenyl were more efficiently activated by the rat preparations while, in contrast, 2-acetylaminofluorene, 2-aminoanthracene, nitrosopiperidine, nitrosopyrrolidine, cyclophosphamide and phenacetin were more efficiently activated by the hamster preparations. No significant difference was observed in the activation of 3-methylcholanthrene, benzo[a]pyrene and 2-aminofluorene. It is concluded that (a) the hamster is relatively refractive to cytochrome P-448 induction, and (b) Aroclor 1254-induced rat and hamster S9 preparations differ in their ability to convert chemical carcinogens to mutagens in the Ames test.

Animals↗
PubMed1977

Intra-hospital transfer: effects on chronically ill psychogeriatric patients.

Since the Vermont State Hospital was approaching a major transition period, it was decided to study systematically the effects of intra-unit and inter-unit transfer on its psychogeriatric patients. Ten patients were assessed by means of four standardized measures in the intra-unit study, specifically investigating the effects of integrating wards previously devoted either to chronic or to acute psychiatric illness. Twenty-five patients from a specialized geriatric unit were evaluated, by separate investigators, with respect to changes occuring as a result of their transfer to regional mixed units. The critical incident log, the problem classification form, and the clinical global impression showed some changes, for which there were several possible explanations. None of the changes was as dramatic as predicted by staff members holding divergent views prior to the study. The optimists predicted a "blossoming" of the psychogeriatric patients in the mixed, regional units, whereas the pessimists prophesied dire consequences. The group of patients studied was not completely homogeneous with respect to the effect to transfer. Clinical assessment after transfer could be relied on to detect improvement in some of these psychogeriatric patients and deterioration in others. Some understanding of the complexity of the multifactor determinants of change developed along with increased cooperation among the investigators and the nursing staff. A middle ground of mutual respect for fresh ideas and an appreciation for years of experience was reached.

Acute Disease↗