K. Mohan Dhasmana

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Intracerebral administration of nicotine in mice produces convulsions without any deaths in doses which are significantly lower than the parenteral doses. The drug seems to act on central nicotinic receptors. The antagonism of central nicotinic convulsions was thus employed for the measurement of the central antiicotinic activity of various CNS acting(More)
Apomorphine (3.5 and 10 mg/kg, s.c.) and morphine (1.3 and 10 mg/kg, s.c.) produced a dose-dependent decrease in gastrointestinal transit of charcoal dust in rats. The involvement of dopamine in such a constipatory effect was found to be mediated to a greater extent by DA2 than by DA1 receptors, using a specific DA1 antagonist (SCH 23390) and DA2(More)
The administration of morphine in conscious cats produces a manic response characterized by hyperexcitement and aggressive behaviour. This manic response was prevented by pretreatment of cats with either CNS catecholamine depletors (reserpine and tetrabenazine) or central dopaminergic receptor blocking agents eg. haloperidol and chlorpromazine. On the other(More)
Effects of ketamine hydrochloride (2, 6 and 18 mg X kg-1, i.v.) were investigated on systemic and regional haemodynamics using a radioactive microsphere method in conscious rabbits. Ketamine decreased respiratory frequency in a dose-dependent manner for up to 5 min. A significant fall in the mean arterial blood pressure (with the two highest doses),(More)
Although 5-hydroxytryptamine (5-HT) increases porcine atrial force and rate via 5-HT4 receptors, its effect on left ventricular contractility is not known. Therefore, using the maximum rate of rise of left ventricular pressure (LVdP/dtmax) as an index of cardiac contractility, we have attempted to analyze the possible role of ventricular 5-HT4 receptors in(More)
This paper reports investigations on the effects on gastrointestinal transit of subcutaneous or intrathecal administration of opiates: morphine, sufentanil and alfentanil. Subcutaneous administration of opiates produced a significant dose-dependent decrease in transit of a charcoal meal test. Intrathecal administration of morphine to Wistar rats with(More)
This paper deals with the effects of 5-hydroxytryptamine (5-HT; serotonin) and related drugs on the gastrointestinal tract (GIT). The nomenclature and classification of 5-HT receptors, as well as their putative role in the GIT are updated in this review. Besides its effects on the cardiovascular system, which have been extensively described, several lines(More)
This study was designed to compare the effects of three neuromuscular blocking agents, in a clinically relevant dose range, on the regional distribution of blood flow measured with 15-microns radioactive microspheres in anesthetized, optimally ventilated cats. d-Tubocurarine (400, 800, and 1,600 micrograms X kg-1) caused hypotension and a decrease in(More)
The effects of 30-min infusions of etomidate 0.03, 0.12 and 0.24 mg kg-1 min-1 on systemic and regional haemodynamic variables and cardiac performance and metabolism were studied in pigs. The drug caused moderate, but dose-dependent, decreases in the cardiac output, arterial pressure and LVdP/dt max. Myocardial wall thickening, measured by echographic(More)