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Biomedical subjects

A Forster

Publications and source records attributed to A Forster.

At least 217 records · Page 12Linked to original sources
PubMed1981

Naloxone in the treatment of anorexia nervosa: effect on weight gain and lipolysis.

The effects of a constant intravenous infusion of naloxone in doses ranging from 3.2 to 6.4 mg/day were studied in a group of patients with anorexia nervosa. Patients showed a significantly greater weight gain during the infusion compared with the periods before and after naloxone. Plasma β-hydroxybutyrate and non-esterified fatty acid levels fell during the infusion. It is suggested that, in man, naloxone has an antilipolytic effect in vivo.

Adolescent↗
PubMed1981

Comparative haemodynamic and respiratory effects of midazolam and flunitrazepam as induction agents in cardiac surgery.

30 cardiac surgical patients were investigated for comparing the respiratory and haemodynamic repercussions of induction of anaesthesia with either flunitrazepam or 8-chloro-6-(2-fluorophenyl)-1-methyl-4H-imidazo[1,5-a] [1,4]benzodiazepine (midazolam, Ro 21-3981, Dormicum). The patients were premedicated with morphine, 0.15 mg/kg i.m., and divided into two groups: one group receiving flunitrazepam 0.03 mg/kg, the other midazolam 0.15 mg/kg injected i.v. over a 15-s period. The induction time and the respiratory depression were similar in both groups. A similar decrease in systolic, diastolic and mean arterial pressures was noted, with maximum decrease of mean arterial pressure of 21% 5 min after injection of flunitrazepam, and of 19% after injection of midazolam. Midazolam produced a significant but transient pulse acceleration of 4% 1 min after the injection, while flunitrazepam produced a moderate decrease of the heart rate. These results indicate that in cardiac surgical patients midazolam produces a moderate respiratory and cardiovascular depression similar to flunitrazepam.

Adult↗
PubMed1980

Effects of dobutamine on cyclic AMP accumulation induced by the stimulation of dopamine receptors in rabbit retina in vitro.

Intact rabbit retinae were used for testing in vitro the potential activation of dopamine receptors by a new cardioactive sympathetic amine dobutamine. It was found that despite the structure relationship of dobutamine with other dopamine-analog, the pharmacological action of this compound is not comparable to that of apomorphine, N-methyl-dopamine and/or ADTN.

Animals↗
PubMed1980

An immunoglobulin heavy-chain gene is altered in two T-cell clones.

Thymus-derived lymphocytes (T cells) show a high degree of discrimination in their responses to various antigens, very similar to the specificity repertoire of antibody-producing B cells. The nature of the T-cell receptor which mediates antigen recognition is obscure, but the ability to discriminate between antigenic specificities implies a range of receptor specificities. Many serological and genetic data suggest that T-cell receptors use the immunoglobulin heavy (H)-chain variable (V) region genes but do not carry the antigenic determinants of the immunoglobulin H-chain constant (C) regions; they also do not seem to carry conventional light (L)-chain V- or C-region determinants. In B cells and derivatives the expression of immunoglobulin genes is manifested, at the DNA level, by an alteration of the restriction enzyme patterns of both the H and L immunoglobulin genes. Specifically, V-gene integration involves joining of a V gene with a J segment (in the case of the H chain probably through an intermediate D segment) so that sites for restriction enzymes will undergo changes in cells in which V-J joining has occurred. Here, we describe Southern filter hybridization experiments using C mu and C kappa probes on the DNA of individual T-cell clones from mice, and present evidence for alteration of sequences adjacent to the C mu gene in the cells.

Animals↗
PubMed1980

The role of gene deletion in the immunoglobulin heavy chain switch.

We have examined the arrangement of the genes for the mouse heavy chain subclasses gamma 2b, gamma 2a and gamma 1 by the Southern hybridisation procedure. Evidence has been found for rearrangement involving the gamma 2b and gamma 2a CH genes in the DNA of cells making IgG2b and IgG2a respectively. The DNA of an IgG2b-secreting line lacks detectable C gamma 1 gene, whilst the DNA of an IgG2a-secreting line lacks detectable C gamma 1 and C gamma 2b genes. The DNA of a cell line secreting IgA lacks detectable C gamma genes. These observations implicate deletion in the mechanism of the H-chain switch and allow a preliminary ordering of some of the CH genes in the mouse genome.

Animals↗
PubMed1980

I.V. midazolam as an induction agent for anaesthesia: a study in volunteers.

The central nervous and cardiovascular effects of midazolam 0.15 mg kg-1 were studied in 20 healthy, unpremedicated volunteers (10 male and 10 female). No important side-effects were noted and the venous tolerance to midazolam was excellent. Three minutes after injection mean systolic arterial pressure decreased from 121 +/- (SEM) 2 mm Hg to 115 +/- (SEM) 2 mm Hg and diastolic pressure from 78 +/- 2 to 70 +/0 2 mm Hg (P < 0.05), and these effects persisted for at least 20 min. Heart rate increased from 77 +/- 4 beat min-1 to 90 +/- 3 and 88 +/- 3 beat min-1 and 3 min after the injection (P < 0.05). Anterograde amnesia (40 +/- 3 min duration) and drowsiness (lasting 128 +/- 23 min) were observed in all subjects. Loss of the eyelash reflex and apnoea were observed more often in the male group than in the female subjects. Midazolam 0.15 mg kg-1 was not sufficient to induce anaesthesia reliably in healthy unpremedicated volunteers.

Adult↗
PubMed1980

Respiratory depression by midazolam and diazepam.

The purpose of this study was to examine the respiratory depression produced by diazepam and by midazolam. Ventilatory and mouth occlusion pressure responses to CO2 were measured in eight healthy volunteers before and after the intravenous administration of 0.3 mg/kg of diazepam and 0.15 mg/kg of midazolam. The mean ventilatory response to CO2 (mean +/- SEM) decreased after administration of diazepam or midazolam from 2.0 +/- 0.2 to 1.3 +/- 0.1 1.min-1/torr or from 2.1 +/- 0.2 to 1.4 +/- 0.1 1.min-1/torr, respectively. In the same volunteers, the mouth occlusion pressure responses decreased from 0.54 +/- 0.05 to 0.30 +/- 0.04 cm H2O/torr after midazolam and from 0.67 +/- 0.12 to 0.28 +/- 0.07 cm H2O/torr after diazepam. When compared with the control slopes of the ventilatory and mouth occlusion pressure responses, the drug slopes were significantly different. Respiration was similarly depressed after diazepam and after midazolam. That both the ventilatory and mouth occlusion pressure responses to CO2 are equally depressed by intravenous injections of midazolam and of diazepam at equipotent doses suggests a direct depression of the central respiratory drive by these drugs.

Adult↗
PubMed1980

Pneumocephalus. A complication of continuous positive airway pressure after trauma.

We report an uncommon and potentially dangerous complication of continuous positive airway pressure (CPAP) applied during spontaneous respiration. A patient with multiple fractures and recurrernt atelectasis developed pneumocephalus on the seventh day of respiratory therapy with CPAP via a face mask. A fracture of the base of the skull, not recognized despite neurologic and radiologic evaluation at admission, was at the origin of this complication.

Adult↗
PubMed1979

[Non-cardiac acute fulminating pulmonary edema occurring at the end of anesthesia].

We have presented a case of acute fulminating pulmonary oedema, not cardiogenic in origin, occurring at the end of anaesthesia. This precise diagnosis was made with the help of measurement of the capillary wedge pressure and cardiac output as well as analysis of the alevolar oedema fluid. The haemodynamic values and the gas exchange, as measured under various ventilatory patterns, confirms the usefulness of continuous positive pressure ventilation (CPPV). In the genesis of acute pulmonary oedema as described, the role of hypoxia and acute obstruction of the upper airways as presented by the patient is discussed in the light of the present proposed theories.

Acute Disease↗
PubMed1977

Immunoglobulin-like messenger RNA in a mouse T cell lymphoma.

RNA-driven complementary DNA (cDNA) hybridization experiments have been carried out in order to detect complementary sequences in RNA prepared from a mouse T cell lymphoma line (EL4). In conditions where efficient hybridization of L-chain cDNA with homologous P3 myeloma mRNA was observed, poor hybridization was observed with EL4 mRNA unless a low criterion of hybrid formation was employed (i.e. hydroxyapatite fractionation). The hybrid formed between EL4 mRNA and L-chain cDNA was found to melt about 5 degrees C below the homologous hybrid indicating that the sequence detected in EL4 mRNA is similar but not identical with the P3 mRNA sequence. However, a similar sequence was detectable in a Clambda-producing myeloma cell line but in this line the concentration of the sequence was found to be an order of magnitude lower than in EL4 cells.

Base Sequence↗