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Biomedical subjects

P Bouyard

Publications and source records attributed to P Bouyard.

At least 37 records · Page 2Linked to original sources
PubMed1979

[Modification of curarization after acute administration of 2 antiepileptic drugs].

In rats anaesthetised with sodium pentobarbital the previous administration of a single dose of an anti-epileptic agent (carbamazepine or sodium valproate) significantly increases the curarising action of two short-action curare-like agents--pancuronium bromide and fazadinium bromide. It seems that this potentialisation of curare action might be the result of either a pharmacokinetic interference (competion for plasma protisen receptor sites), or due to a summation of depressor actions at the neuromuscular level, especially through changes in the levels of GABA and/or cAMP.

Animals↗
PubMed1979

[Circadian variations of the plasma proteins in the adult male rat under natural synchronisation (author's transl)].

Circadian rhythms of blood total proteins, albumin, alpha 1-, alpha 2-, beta- and gamma-globulins were documented in 80 Wistar SPF adult male rats, synchronized by natural light (06.00-18.00 h) and darkness (18.00-06.00 h) during the month of October 78. Blood was sampled at four fixed time points in the 24 h scale (i.e. 04.00, 10.00, 16.00 or 24.00 h). Total proteins, albumin, alpha 2- and gamma-globulins showed a statistically significant rhythm with a maximum at 04.00 h. The data obtained in anaesthetized rats under artificial synchronization and in man are compared, taking into account that the rat is a nocturnally active rodent. The present work partially confirms the hypotheses of previous chronopharmacological studies, thus e.g. curarizing substances have a mimimum activity when the protein plasma level, especially albumin, is the highest.

Alpha-Globulins↗
PubMed1978

[Chronopharmacology of pancuronium in rats anesthetized by CT 1341 (Alfatésine)].

A circadian variation in the curarizing ability of pancuronium bromide (Pavulon) has been documented in an homogenous group of 100 Wistar AF-SPF adult male rats anaesthetized by the steroid anaesthetic althesin (Alfatésine, CT 1341). Animals were maintained at 24 +/- 2 degrees C and synchronized with natural light 06.00 to 18.00 and darkness (october 1977). We observed significant circadian rhythms for both of these agents: first the induction of anaesthesia by althesin was markedly pronounced at 15.30 and varied with season. Secondly the maximum effect of pancuronium was recorded at 08.00. When rats were anaesthetized by sodium pentobarbital under similar experimental conditions but during a different season (january to may) we observed a similar circadian rhythm for pancuronium. These data indicate that: a) the type of anaesthesia used in the protocol may not be of importance in demonstration of a curarizing rhythm in the rat but, b) the possibility of a seasonal component being present and effecting this rhythm needs to be investigated.

Alfaxalone Alfadolone Mixture↗
PubMed1977

[Toxico-pharmacological study of lyophilized sodium nitroprusside (SNP)].

Sodium nitroprusside (SNP) shows a strong hypotensive activity not only in normotensive animals but also in the presence of experimentally induced arterial hypertension. Its use in intravenous perfusion produces the rapid induction of arterial hypotension lasting or only slightly exceeding the time of its administration. Most investigators consider this hypotensive activity related to the fall in peripheral resistance, as is supported by the considerable fall in diastolic blood pressure. However, an effect of SNP on heart function cannot be ruled out. After four weeks' treatment at dosages corresponding to one tenth of the LD 50, no local or general toxicity could be demonstrated.

Animals↗
PubMed1976

[Biological rhythms and chronopharmacology].

After defining the various factors of chronobiology (chronophysiology, chronopathology, chronotoxicology and chronopharmacology), the authors describe the various methods available for the study of biological rhythms; which leads to the concept of "time structure".

Animals↗
PubMed1976

[Toxico-pharmacologic study of a curarimimetic, AH 8165, in relation to storage time].

The toxicological and pharmacological study of a non depolarizing curariform drug AH 8165 was performed under various conditions of storage, duration and temperature (duration: 1 month 2 years; temperature: 4 degrees C to 70 degrees C). It shows that this drug ought to be kept a low temperature for storage (in the range of + 4 degrees C). In the sam way, this study demonstrates a better stability of this drug when stored lyophilized form instead of a solute. The interest of standardized animal experimentation in studying the activity of a therapeutic substance depending on the duration of storage is shown.

Animals↗
PubMed1976

[Cardiovascular effect of various morphine-line analgesics in rabbits anesthetized with thiopental or alphadione (Alfatesine)].

Alphadione (Alfatésine, Althesin, CT 1341), a steroid anaesthetic with a quick and short action, has but a very moderate analgesic activity, so it is necessary in human anaesthesian, to associate with it a morphinic analgesis systematically. Therefore it was interesting to study the response of cardiovascular system when using this type of association. Our results show that the cardiovascular depressive effects of morphinic analgesics, when they exist, are not increased by the presence of alphadione.

Alfaxalone Alfadolone Mixture↗
PubMed1975

[Variations in the activity of various curarizing substances as a function of the time of administration].

This experiment was carried out upon the male-adulte-AF SPF-Wister Rat, anesthetized by the use of pentobarbital-Na at the only dosage of 40 mg/kg/IP and put under artificial ventilation. The animals were divided into two groups: Group I, "diurnal animals" curarized between 10 a.m and 4 p.m; Group 2, "nocturnal animals" curarized between 9 and 12 p.m. Four drugs of the curarimimetic (pachycurare, non-depolarizing) type: gallamine, D-tubocurarine, pancuronium and AH-8165 were studied at doses presenting the same activity. The total curarizing effect measured by the surface defined by the curve of curarization within ten mns was constantly and significantly lowered in "nocturnal animals": a 25 p. 100 diminution with gallamine, 20 p. 100 diminution with D-tubocurarine, 27 p. 100 diminution with pancuronium, 19 p. 100 diminution with AH-8165. The hypothesis is that this diminution in the action of curarizing substances may be, to a great extent, in keeping with the rise of their metabolism -- the hepatic enzymatic activity being, in the rat, a nocturnal animal, definitely increased during the night.

Animals↗