Modification by strychnine and D-tubocurarine of cardiac vagal inhibition in dogs. 1981

V K Bhargava, and P Bhargava, and D N Sharma, and K D Tripathi

Intravenous infusion of strychnine or D-tubocurarine chloride attenuated the cardiac depressant action and fall in blood pressure produced by electrical stimulation of the right vagus nerve in dogs anesthesized with pentobarbitone sodium. The effects of exogenous acetylcholine on the heart and blood pressure (B.P.) were not modified by strychnine or D-turbocurarine. Physostigmine sulphate potentiated the effects of injected acetylcholine without modifying the effects of strychnine and D-tubocurarine on vagal transmission. Dimethylphenylpiperazinium bromide also produced its characteristic effects on the heart and B.P. in the presence of strychnine and D-tubocurarine. The results indicate that strychnine and D-tubocurarine inhibition of vagal transmission is not a result of blockade of peripheral cholinergic receptors or cardiac vagal ganglia. This inhibition occurs presumably via a preganglionic presynaptic action.

UI MeSH Term Description Entries
D008297 Male Males
D009200 Myocardial Contraction Contractile activity of the MYOCARDIUM. Heart Contractility,Inotropism, Cardiac,Cardiac Inotropism,Cardiac Inotropisms,Contractilities, Heart,Contractility, Heart,Contraction, Myocardial,Contractions, Myocardial,Heart Contractilities,Inotropisms, Cardiac,Myocardial Contractions
D001794 Blood Pressure PRESSURE of the BLOOD on the ARTERIES and other BLOOD VESSELS. Systolic Pressure,Diastolic Pressure,Pulse Pressure,Pressure, Blood,Pressure, Diastolic,Pressure, Pulse,Pressure, Systolic,Pressures, Systolic
D004246 Dimethylphenylpiperazinium Iodide A selective nicotinic cholinergic agonist used as a research tool. DMPP activates nicotinic receptors in autonomic ganglia but has little effect at the neuromuscular junction. DMPP,1,1-Dimethyl-4-phenylpiperazine Iodide,Dimethylphenylpiperazinium,1,1 Dimethyl 4 phenylpiperazine Iodide,Iodide, 1,1-Dimethyl-4-phenylpiperazine,Iodide, Dimethylphenylpiperazinium
D004285 Dogs The domestic dog, Canis familiaris, comprising about 400 breeds, of the carnivore family CANIDAE. They are worldwide in distribution and live in association with people. (Walker's Mammals of the World, 5th ed, p1065) Canis familiaris,Dog
D005260 Female Females
D006321 Heart The hollow, muscular organ that maintains the circulation of the blood. Hearts
D000109 Acetylcholine A neurotransmitter found at neuromuscular junctions, autonomic ganglia, parasympathetic effector junctions, a subset of sympathetic effector junctions, and at many sites in the central nervous system. 2-(Acetyloxy)-N,N,N-trimethylethanaminium,Acetilcolina Cusi,Acetylcholine Bromide,Acetylcholine Chloride,Acetylcholine Fluoride,Acetylcholine Hydroxide,Acetylcholine Iodide,Acetylcholine L-Tartrate,Acetylcholine Perchlorate,Acetylcholine Picrate,Acetylcholine Picrate (1:1),Acetylcholine Sulfate (1:1),Bromoacetylcholine,Chloroacetylcholine,Miochol,Acetylcholine L Tartrate,Bromide, Acetylcholine,Cusi, Acetilcolina,Fluoride, Acetylcholine,Hydroxide, Acetylcholine,Iodide, Acetylcholine,L-Tartrate, Acetylcholine,Perchlorate, Acetylcholine
D000818 Animals Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA. Animal,Metazoa,Animalia
D013331 Strychnine An alkaloid found in the seeds of STRYCHNOS NUX-VOMICA. It is a competitive antagonist at glycine receptors and thus a convulsant. It has been used as an analeptic, in the treatment of nonketotic hyperglycinemia and sleep apnea, and as a rat poison. Strychnine Nitrate,Nitrate, Strychnine

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