Doggrell SA, Nand V. Effects of tedisamil on cardiovascular tissues isolated from normo- and hypertensive rats.
J Cardiovasc Pharmacol Ther 2001;
6:261-72. [PMID:
11584333 DOI:
10.1177/107424840100600307]
[Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
BACKGROUND
This study was undertaken to characterize the effects of tedisamil on isolated rat cardiovascular tissues, and identify actions that could be beneficial or detrimental in the treatment of cardiac disease.
RESULTS
Tedisamil prolonged the Wistar Kyoto normotensive rat (WKY) left ventricular action potential and augmented the force of contraction of left ventricle strips. On the 12-month-old SHR model of cardiac hypertrophy, the augmenting effects of tedisamil at 10(-6) and 3 x 10(-6) M were reduced. On the 21-month-old SHR model of heart failure, the augmenting effects of tedisamil at 10(-6) and 3 x 10(-6) M were further reduced. The augmenting effect of tedisamil at 10(-5) M was reduced to 47%. The rate of the right atrium of 16- to 17-month-old WKY was reduced by tedisamil at 10(-5) and 10(-4) M, and tedisamil had a similar effect on the SHR right atrium. Tedisamil at 10(-6)--3 x 10(-5) M contracted the portal veins of WKY and aortae of 12-month-old WKY and SHR.
CONCLUSIONS
The positive inotropic and negative chronotropic effects of tedisamil in the rat, which are partially or fully maintained in hypertrophied or failing myocardium would be beneficial in the treatment of heart failure. In contrast, the vasoconstrictor action of tedisamil will be detrimental in heart failure.
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