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• W2091451491 abstract "As endothelin-1 exerts positive inotropic effects, the present study evaluated whether the hypotensive effects of the endothelin-1 receptor antagonist bosentan were partially related to a decrease in myocardial performance.In group I, eight anaesthetized open-chest dogs with perinephritic hypertension received four cumulative doses of bosentan (B1-B4). In group II, eight animals received the same doses of bosentan after autonomic blockade. Indices of heart function were derived from the pressure-length loops obtained during vena cava occlusion.In group I, bosentan decreased left ventricular systolic pressure (LVSP) and mean aortic pressure (MAP) dose dependently, reaching 21% and 23% respectively at B4 (LVSP from 190 +/- 8 to 150 +/- 5 mmHg, P < 0.001; MAP from 167 +/- 7 to 128 +/- 5 mmHg, P < 0.001). These effects were only related to peripheral vasodilatation, without depression of myocardial contractility, as systemic vascular resistance dropped (from 670 +/- 83 to 446 +/- 53 mmHg mL-1 min-1 x 10(4); P < 0.05), and the end-systolic pressure-length relationship (ESPLR) remained unchanged (4.0 +/- 0.4 vs. 4.3 +/- 0.7 mmHg mm-1 kg-1). Concomitantly with pressure decline, heart rate tended to increase in this group (from 150 +/- 4 to 156 +/- 6 beats min-1). When autonomic system was blocked (group II), administration of bosentan induced similar hypotensive effects as in group I (26% and 28% reduction in LVSP and MAP respectively, P < 0.001) whereas ESPLR did not change (3.0 +/- 0.9 vs. 3.1 +/- 0.5mmHg-1 mm kg-1 ). Under these sympathetically blocked conditions, heart rate significantly fell after bosentan infusion (from 120 +/- 4 to 110 +/- 6 beats min-1, P < 0.001).Without influencing heart function, bosentan is an efficient and safe therapy that opens up new therapeutic perspectives in human essential hypertension." @default.
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• W2091451491 date "1998-10-01" @default.
• W2091451491 modified "2023-09-23" @default.
• W2091451491 title "Endothelin-1 receptor antagonism does not influence myocardial function in hypertensive dogs" @default.
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• W2091451491 doi "https://doi.org/10.1046/j.1365-2362.1998.00374.x" @default.
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