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Haffner JF, Landmark K. Opposing anticholinergic and cardio-depressive effects of promazine and thioridazine in isolated rat atria. ACTA PHARMACOLOGICA ET TOXICOLOGICA 2009; 31:529-39. [PMID: 4678833 DOI: 10.1111/j.1600-0773.1972.tb03616.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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Landmark K, Refsum H. Anticholinergic and anti-arrhythmic effects of phenoxybenzamine on the isolated rat atrium. ACTA PHARMACOLOGICA ET TOXICOLOGICA 2009; 32:214-24. [PMID: 4801723 DOI: 10.1111/j.1600-0773.1973.tb01465.x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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Refsum H, Landmark K. The action of practolol on the isolated rat atrium. ACTA PHARMACOLOGICA ET TOXICOLOGICA 1972; 31:97-106. [PMID: 4401927 DOI: 10.1111/j.1600-0773.1972.tb00702.x] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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Landmark K, Haffner JF, Setekleiv J. Reduction in 42 K-efflux from rat atria by promazine and thioridazine. ACTA PHARMACOLOGICA ET TOXICOLOGICA 1972; 31:54-64. [PMID: 5067391 DOI: 10.1111/j.1600-0773.1972.tb00697.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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Hunter EG, McDonald TF, MacLeod DP. Metabolic depression and myocardial potassium. Pflugers Arch 1972; 335:266-78. [PMID: 4673211 DOI: 10.1007/bf00586217] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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Landmark K. The action of promazine and thioridazine in isolated rat atria. 1. Effects on automaticity, mechanical performance, refractoriness and excitability. Eur J Pharmacol 1971; 16:1-7. [PMID: 5157528 DOI: 10.1016/0014-2999(71)90049-5] [Citation(s) in RCA: 27] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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Der Einflu� des Beta-Receptorenblockers Propranolol auf die experimentell induzierte Schrittmacher-Aktivit�t isolierter Myokard-Pr�parate. Naunyn Schmiedebergs Arch Pharmacol 1967. [DOI: 10.1007/bf00538530] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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REUTER H. Ein Beitrag zur Erkl�rung der Erregbarkeitssteigerung des Herzens bei Thyreotoxikose. J Mol Med (Berl) 1963; 41:737-41. [PMID: 13981823 DOI: 10.1007/bf01478017] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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WEST TC, FREDERICKSON EL, AMORY DW. Single Fiber Recording of the Ventricular Response to Induced Hypothermia in the Anesthetized Dog. Circ Res 1959; 7:880-8. [PMID: 13844152 DOI: 10.1161/01.res.7.6.880] [Citation(s) in RCA: 37] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Ventricular membrane Potentials were recorded by the microelectrode technic in anesthetized, open-chest dogs. Concurrently, intraventricular pressure, electrocardiogram and esophageal temperature were recorded. Hypothermia was induced by an extracorporeal cooling method. Data on the parameters observed are presented for a temperature range from 38 to 22 C. The mean temperature for spontaneous ventricular fibrillation was approximately 22 C. Hypothermia increased single fiber action potential duration, primarily by prolonging the plateau phase. Depolarization and terminal repolarization were less affected. Action potential amplitude and resting potential were not changed. Change in action potential duration as a function of varying heart rate became more pronounced with cooling. A characteristic change in action potential shape during early repolarization became evident as hypothermia progressed. Hypothermic changes in the single fiber action potential are compared with changes in the electrocardiogram and the pressure curve. Recordings made from single fibers during hypothermic ventricular fibrillation showed a marked shortening in action potential duration.
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