Effect of physostigmine on morphine-induced postoperative pain and somnolence.

The effects of physostigmine 1 mg i.v. were studied on the analgesia, sedation and reduction in respiratory rate induced by morphine 10 mg/60 kg i.

Activation of central muscarinic receptors causes respiratory stimulation in conscious animals.

1 Oxotremorine (10 microgram/kg) injected intravenously into conscious rabbits pretreated with atropine-methyl-nitrate (ATMN, 0.5 mg/kg) caused significant increases in respiration rate from 94 to 131 per min, and in PaO2 from 13.8 to 15.

A generalised scan statistic test for the detection of clusters.

The scan statistic can be used for the testing of clusters of disease in time. However, it is not valid in situations in which there is some change in the population at risk or in the detection rate of the disorder. Furthermore, it cannot distinguish between a cluster due to the changing pattern of known risk factors for the disease and one due to other causes.

Antagonism of the cardiovascular and respiratory depressant effects of morphine in the conscious rabbit by physostigmine.

The influence of physostigmine was studied on the effect of morphine on the cardiovascular and respiratory systems in conscious rabbits. Morphine (4 mg/kg i.v.

An analysis of the respiratory stimulant effect of physostigmine and neostigmine in the conscious rabbit.

1. The effects of physostigmine and neostigmine, given by continuous intravenous infusion, were studied on respiration in conscious rabbits. 2.

Evidence that noradrenaline modulates the increase in striatal dopamine metabolism induced by muscarinic receptor stimulation.

The effect of oxotremorine was studied on the concentration of homovanillic acid (HVA) and 3-methoxy-4-hydroxyphenylethylglycol (MHPG) in the corpus striatum of rats. At a dose of 1 mg/kg oxotremorine increased HVA levels by 68% and MHPG, by 51%. MHPG was also increased in the nucl.

Physostigmine antagonizes morphine-induced respiratory depression but not analgesia in dogs and rabbits.

The ability of physostigmine to antagonize the respiratory depressant effect of morphine was studied in conscious rabbits and ketamine-anaesthetized dogs pretreated with atropine methyl nitrate. Morphine 4 mg kg-1 increased PaCO2 in the rabbit from 3.43 +/- 0.

Ventricular self-defibrillation in mammals: age and drug dependence.

Ventricular fibrillation (VF) was electrically induced in cats, rabbits, guinea pigs and rats. In young animals of all species and also in old rats short transient VF (TVF) was followed by spontaneous reversion to normal sinus rhythm. Old cats, rabbits and guinea pigs had episodes of sustained VF (SVF) which did not terminate spontaneously; artificial electro-defibrillation was required.

Nickel and calcium ions modify the characteristics of the acetylcholine receptor-channel complex at the frog neuromuscular junction.

1. Miniature end-plate currents (m.e.

Peripheral catecholamines mediate certain responses to central cholinergic receptor stimulation by oxotremorine.

The role of peripheral catecholamines in mediating the pressor and tremorigenic effects of oxotremorine were investigated in conscious rats. At time of peak tremor intensity induced by oxotremorine, plasma adrenaline and noradrenaline were increased 3--4-fold. Tremor intensity was substantially reduced by either adrenal medullectomy, chemical sympathectomy with 6-hydroxydopamine, or injection of 2.

Differential effects of d- and l-propranolol on dopamine turnover stimulated by oxotremorine in striatal and mesolimbic areas of rat brain.

The effects of l-propranolol, d-propranolol and clonidine on homovanillic acid (HVA) concentrations in the corpus striatum and nucleus accumbens of rats were studied under normal conditions and after treatment with oxotremorine or haloperidol. Thile propranolol and clonidine given alone had no significant effect on HVA levels in either area, l-propranolol (1--10 mg/kg) and clonidine (0.1 mg/kg), both significantly inhibited the elevation of striatal HVA, found 60 min after oxotremorine administration.

Effects of procaine and extracellular calcium concentration on response of rat stomach fundus muscle to acetylcholine and 5-hydroxytryptamine.

1. When rat stomach fundus muscle was incubated for 30 min in Tyrode solution from which calcium chloride had been omitted, there was an almost complete abolition of the contractile response to 5-hydroxytryptamine (5-HT) while that to acetylcholine (ACh) was still present. 2.

Cardioselectivity as a function of molecular structure in beta-adrenoceptor blocking agents of the 1-(para-substituted aryloxy)-3-(isopropylamino)propan-2-ol type.

The relationship between molecular structure and cardioselectivity is described in the 1-(para-substituted aryl-oxy)-3-(isoprophylamino)propan-2-ol type of beta-adrenoceptor blocking agents. Cardioselectivity in the aforementioned series requires that the aromatic substitution in the position para to the amino alcohol side chain will have a minimal linear length of 5.0 A.

The role of peripheral catecholamines in oxotremorine tremor in the rat and its antagonism by beta adrenoceptor blocking agents.

Oxotremorine, 0.25 mg/kg, produces marked tremor in the rat, which is abolished by scopolamine, 0.5 mg/kg, and is substantially reduced in intensity and duration both by adrenalmedullectomy and by chemical sympathectomy with 6-hydroxydopamine.

Changes in brain catecholamine turnover and receptor sensitivity induced by social deprivation in rats.

Catecholamine turnover was compared in two brain areas of rats housed under different social conditions. Rats reared in isolation for 6-8 weeks had a significantly lower noradrenaline turnover in the brainstem and lower noradrenaline and dopamine turnover in a brain segment comprising all other areas except the cerebellum, pineal gland, thalamus, and subthalamus. In the open-field test, isolated rats were much more active than group-housed animals.

Beta-adrenoceptors modulate noradrenaline release from axonal sprouts in cultured rat superior cervical ganglia.

Superior cervical ganglia of rats grown in organ culture were used to study the effect of beta-receptor stimulants and antagonists on 3H-noradrenaline release in response to stimulation by KC1 (75 mM). (--)-Isoprenaline 1X 10(-9)--1 X 10(-7) M) increased 20--25% the release of 3H-noradrenaline from cultured ganglia exposed to KC1. Isoprenaline did not modify either the spontaneous (non-calcium dependent) release of 3H-noradrenaline from cultured ganglia, or the KC1-stimulated release from fresh ganglia.

Nature of seasonal variation in development of acute tolerance to morphine.

Morphine inhibits contractions of coaxially stimulated guinea pig ileum. Acute tolerance to this effect occurs on continuous perfusion with morphine for 1.5 h.