title: Negative cardiac inotropic effects of calcium ion and of N-2-hydroxyethylpiperazine-N' -2-ethanesulfonic acid (HEPES) buffer at normal and low sodium concentration.
mesh_terms: D000476:Alkanesulfonates / Q000494:pharmacology; D000818:Animals; D002021:Buffers; D002118:Calcium / Q000494:pharmacology*; D003864:Depression, Chemical; D004558:Electric Stimulation; D005260:Female; D006325:Heart Atria / Q000187:drug effects*; D066298:In Vitro Techniques; D008297:Male; D010879:Piperazines / Q000494:pharmacology*; D011817:Rabbits; D012964:Sodium / Q000494:pharmacology*; D013997:Time Factors
chemical_list: D000476:Alkanesulfonates; D002021:Buffers; D010879:Piperazines; D012964:Sodium; D002118:Calcium