Animal 4 Dogs 4 English Abstract 4 Hypotension 4 Injections, Spinal 4 animal 4 animal experiment 4 article 4 blood pressure 4 cardiovascular system 4 dog 4 drug mechanism 4 hypotension 4 iatrogenic disease 4 intraspinal drug administration 4 intravenous drug administration 4 noradrenalin 4 Blood Pressure 2 Carotid Arteries 2 Dinoprostone 2 Electric Stimulation 2 Epinephrine 2 Injections, Intra-Arterial 2 Injections, Intramuscular 2 Injections, Intravenous 2 Liver 2 Norepinephrine 2 Propranolol 2 Prostaglandin Antagonists 2 Prostaglandins A 2