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This study evaluated the effects of milrinone, adrenaline and dobutamine with pressure-volume loops and isolated atrial tissue.    Agonist dose-response curves to incremental drug infusions were acquired in 11 anesthetised rabbits using pressure-volume loops and preload recruitable stroke work indicated contractility. Agonist concentration-response curves were completed in eight guinea pig isolated atria, for effects on atrial rate and force.    Adrenaline and dobutamine increased contractility (P=0.006 and 0.044), whereas milrinone did not (P=0.895). Only adrenaline increased myocardial stiffness (P&lt;0.001). Milrinone decreased vascular resistance (P&lt;0.001) and elicited the greatest fall in mean arterial pressure (P&lt;0.001) and increased ejection fraction (P&lt;0.001). Adrenaline decreased heart rate (P&lt;0.001), whereas dobutamine and milrinone increased it (P=0.006 and 0.011). Milrinone increased the force of left atrial contraction, but its inotropic effect was weak and significantly less than with dobutamine and adrenaline (P &lt;0.001).    Adrenaline acted as an inoconstrictor, dobutamine an inodilator and milrinone predominantly a vasodilator.

The Cardiovascular Effects of Adrenaline, Dobutamine and Milrinone in Rabbits Using Pressure-Volume Loops and Guinea Pig Isolated Atrial Tissue