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Biomedical subjects

S I Ankier

Publications and source records attributed to S I Ankier.

At least 55 records · Page 3Linked to original sources
PubMed1983

An evaluation of the short-term hypnotic efficacy of loprazolam in comparison with nitrazepam in elderly patients.

A double-blind, parallel group, randomized trial was carried out to compare the hypnotic efficacy of 1.0 mg loprazolam and 5.0 mg nitrazepam in 40 elderly patients. All had disturbed sleep patterns, which were not the result of physical illness, and had been shown to be placebo non-responders during a 3-day placebo screening period. Patients received active medication for 7 nights. Both loprazolam and nitrazepam significantly improved sleep patterns, as measured by patient self-rating scales and night nurses' global assessments, in comparison with the placebo baseline screen (p less than 0.001). No significant differences in efficacy were shown between drug treatments and no untoward effects were recorded which could be attributed to either drug. The results suggest that 1.0 mg loprazolam is an effective and well-tolerated hypnotic in elderly patients suffering from insomnia.

Aged↗
PubMed1981

Trazodone--a new assay procedure and some pharmacokinetic parameters.

1 A simple and specific procedure is described for the determination of the new anti-depressant trazodone in human plasma utilising reverse-phase HPLC which is sensitive to 20 ng ml-1. 2 Following oral administration of single 50 mg doses of two formulations of trazodone on separate occasions to healthy fasted volunteers, the peak plasma concentration, time to peak concentration, area under the curve, elimination rate constant and half-life were determined. 3 The two formulations are closely similar and they are considered to have comparable bioavailability.

Biological Availability↗
PubMed1978

Some effects of disopyramide and its N-dealkylated metabolite on isolated nerve and cardiac muscle.

In animals and man the antidysrhythmic agent disopyramide in primarily metabolised by mono-N-dealkylation. The effects of disopyramide and its N-dealkylated metabolite (MIP) have been investigated using isolated cardiac and nervous tissue, and their effects have been compared with the effects of other antidysrhythmic agents. Disopyramide, d,l-propranolol and quinidine all decreased both maximum driving frequency and developed tension in electrically driven guinea pit atria. MIP and procaine amide also decreased maximum driving frequency, but had a positive intropic effect. MIP was only 4 times less active than disopyramide in decreasing maximum driving frequency. There was no evidence that either disopyramide or MIP possessed beta-adrenoceptor antagonist properties. In superfused rat sciatic nerves, it has been shown that neither disopyramide nor MIP possesses significant local anaesthetic properties. Procaine amide and lignocaine were highly active in this test. The possible contribution of MIP to the actions of disopyramide in vivo is discussed.

Action Potentials↗
PubMed1971

Investigation of central cholinergic mechanisms in the conscious mouse.

1. An investigation of central cholinoceptors in the mouse has been made by injecting cholinomimetic drugs into the cerebral ventricles and seeing how their effects were modified by prior administration of atropine-like substances and other drugs.2. Carbachol or oxotremorine injected in small doses intracerebroventricularly into conscious mice caused hypothermia, gross tremor and a variety of parasympathomimetic effects including lachrymation and salivation. Acetylcholine injected in this way was active only in much larger doses.3. Methacholine and pilocarpine also caused a variety of parasympathomimetic effects after intracerebroventricular injection but virtually no hypothermia or tremor.4. Nicotine injected intracerebroventricularly caused mild hypothermia, fine tremor but no parasympathomimetic effects.5. Atropine-like drugs, tricyclic antidepressants and amphetamine antagonized the hypothermia induced by intracerebroventricular carbachol or oxotremorine.6. The sites of action of the atropine-like drugs are in the brain; those of the tricyclic antidepressants and amphetamine are in the periphery probably on heat generating beta-adrenoceptor mechanisms.7. It is concluded that the atropine sensitive cholinoceptors in the brain vary in their sensitivities to cholinomimetic drugs, other than acetylcholine, and may exist in isoreceptor forms.8. Peripheral atropine sensitive cholinoceptors may also exist in isoreceptor forms.

Acetylcholine↗