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Katz RL, Wang H. Effects of intravenous and intracoronary THAM on coronary blood flow. ACTA ANAESTHESIOLOGICA SCANDINAVICA. SUPPLEMENTUM 1966; 23:635-42. [PMID: 6012328 DOI: 10.1111/j.1399-6576.1966.tb01075.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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Abstract
The effects of localized acidosis and alkalosis on coronary blood flow, myocardial contractile force, and heart rate were studied in anesthetized, open-chest dogs. Acidosis of the coronary vascular bed was induced by infusion of 5,5-dimethyl-2, 4-oxazolidinedion (DMO) into the total coronary artery inflow, and alkalosis by infusion of tris hydroxymethyl aminomethane (THAM), Na
2
CO
3
or NaHCO
3
. DMO infusion caused an initial slight increase of coronary blood flow, followed by a decrease. The decrease was accompanied by and attributed to a moderate to marked decrease of myocardial contractile force and bradycardia. THAM and Na
2
CO
3
infusion caused a marked increase of coronary blood flow, associated with a decrease of coronary oxygen A-V difference, indicating coronary vasodilation. A slight to moderate increase of myocardial contractile force but little or no change in heart rate was noted. NaHCO
3
infusion caused changes similar to those induced by DMO but of smaller magnitude. It was suggested that the direct effects of DMO and NaHCO
3
are attributable to intracellular acidosis, whereas those of THAM and Na
2
CO
3
are attributable to intracellular alkalosis.
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