The negative inotropic action of norepinephrine in the presence of ouabain.
D000818:Animals; D002122:Calcium Chloride / Q000494:pharmacology; D004558:Electric Stimulation; D005260:Female; D006168:Guinea Pigs; D006325:Heart Atria / Q000187:drug effects*; D006339:Heart Rate / Q000187:drug effects; D006633:Histamine Antagonists; D007545:Isoproterenol / Q000037:antagonists & inhibitors; D008297:Male; D009119:Muscle Contraction / Q000187:drug effects*; D009638:Norepinephrine / Q000037:antagonists & inhibitors* / Q000494:pharmacology; D010042:Ouabain / Q000494:pharmacology*; D010646:Phentolamine; D011189:Potassium Chloride / Q000494:pharmacology; D011433:Propranolol; D013696:Temperature; D014439:Tyramine / Q000037:antagonists & inhibitors
D006633:Histamine Antagonists; D010042:Ouabain; D011189:Potassium Chloride; D011433:Propranolol; D007545:Isoproterenol; D002122:Calcium Chloride; D009638:Norepinephrine; D014439:Tyramine; D010646:Phentolamine