<prompt> Which of the following isare true about dobutamine:Selective 3 2 receptor agonistT ventricular filling pressureHalf life is about 2 minDopamine receptor agonist  <response>: Ans. C Half life is about 2 minDobutamine:Derivative of dopamine, but not a Dl ot D2 receptor agonist.Has action on alpha beta receptors also.Yet, only prominent action of clinically employed doses is increased force of cardiac contraction outPut, without significant change in hea rate, peripheral resistance BP.Considered to be a relatively selective beta-1 agonist.Half-life of about 2 minutes onset of action is rapid.Used as an inotroPic agent in pump failure accompanying myocardial infarction, cardiac surgery for sho term management of severe congestive hea failure. 