Résumé
Anxiety can alter the cardiovascular parameters. In the present study, among the normotensive donors, the effect of anxiety on alteration of blood pressure and heart rate was assessed. Blood pressure and pulse rate were recorded in the volunteers just before blood donation and the results were compared with the blood pressure and heart rate recorded previously (one week before the camp) in the same population. There was a rise of both systolic and diastolic blood pressure with a significant increase in pulse rate just before blood donation. As the donors had previous experience of blood donation; the mental stress just before blood donation can be regarded as known stress -- which caused increase in norepinephrine secretion leading to peripheral vasoconstrictions and rise in diastolic blood pressure. Anxiety through sympathetic stimulation increased the heart rate, cardiac output and systolic blood pressure.
Sujets)
Adolescent , Adulte , Donneurs de sang , Pression sanguine , Femelle , Humains , Mâle , Stress psychologiqueRésumé
Studies on pre-clinical toxicity were undertaken to determine the haematological and biochemical changes after administration of alcoholic extract of leaf-stalk of P. betle in rats and mice. Acute and chronic toxicity experiments were performed on mice and rats according to WHO protocol. Different doses of plant extractive were administered for toxicity studies on short and long term basis. Haematological, biochemical profiles and enzymatic studies (transaminases and phosphatases) indicated that the drug (plant extractive) was devoid of toxicity.
Sujets)
Magnoliopsida/composition chimique , Animaux , Évaluation préclinique de médicament , Enzymes/métabolisme , Femelle , Rein/effets des médicaments et des substances chimiques , Foie/effets des médicaments et des substances chimiques , Mâle , Souris , Taille d'organe/effets des médicaments et des substances chimiques , Extraits de plantes/administration et posologie , Plantes médicinales/composition chimique , RatsRésumé
Chronic administration (sc) of the extract of the stalk of P. betle at 30 mg/kg body weight daily for 21 days produced significant decrease in oestrogen and androgen dependent target organ weights along with increase in cholesterol in adrenal, ovary and testis. Acid and alkaline phosphatase activities in serum, liver and kidney did not exhibit any toxic effect. There was marked change in morphology of testis and ovary. Vaginal smear showed prolonged dioestrus in treated female. The treated male showed decreased number and motility of sperm. Both male and female remained infertile after treatment suggesting antifertility activity of the extract on both sexes of albino rats.