title: [The use of 2-component myocardial contraction for assessing the mechanism of action of inotropic substances].
abstract: The possibility of using two-component contraction of the myocardium to evaluate the mechanisms of action of cardiotropic pharmacological agents was studied. Caffeine, ouabain, low-natrium solution, varapamil, nifedipine and BAY K-8644 were used. It was concluded that the analysis of contraction component amplitude dynamics makes it possible to determine the effect of the pharmacological agents on the interrelated mechanisms of the delivery of Ca2+ into the myoplasm of cardiomyocytes from sarcoplasmic reticulum and through sarcolemma during a single cardiac cycle.
authors: S A
authors: SA
authors: Bogomaz
authors: B I
authors: BI
authors: Laptev
mesh_terms: D000818:Animals; D002118:Calcium / Q000378:metabolism; D002316:Cardiotonic Agents / Q000494:pharmacology*; D004353:Drug Evaluation, Preclinical / Q000379:methods; D005260:Female; D006168:Guinea Pigs; D066298:In Vitro Techniques; D008297:Male; D009200:Myocardial Contraction / Q000187:drug effects*; D009206:Myocardium / Q000378:metabolism; D010210:Papillary Muscles / Q000187:drug effects; D012508:Sarcolemma / Q000187:drug effects / Q000378:metabolism; D012519:Sarcoplasmic Reticulum / Q000187:drug effects / Q000378:metabolism
chemical_list: D002316:Cardiotonic Agents; D002118:Calcium
vernacular_title: Ispol'zovanie dvukhkomponentnogo sokrashcheniia miokarda dlia otsenki mekhanizme deĭstviia inotropnykh veshchestv.