Dobutamine (Dobutrex) improves cardiac output and is indicated for use in all of the following conditions except:
A. Septic shock
B. Congestive heart failure
C. Arrhythmias
D. Pulmonary congestion
Correct Answer: C. Arrhythmias
Dobutamine (Dobutrex) is not used to treat arrhythmias. Dobutamine is approved by the Food and Drug Administration (FDA) for short-term use in patients with decreased contractility due to heart failure or cardiac surgical procedures leading to cardiac decompensation.
Option A: Short-term intravenous inotropic support should be given to patients in cardiogenic shock to preserve systemic blood flow and protect from end-organ damage.
Option B: Patients can reasonably receive dobutamine in continuous intravenous form for inotropic support to bridge patients with late-stage heart failure, stage D, that is refractory to guideline-directed medical therapy until patients who are candidates for and awaiting cardiac transplantation or mechanical circulatory support receive the appropriate long-term treatment.
Option D: In addition to the well-known beta-1 activity, dobutamine has shown to have some beta-2 activity, which contributes to the reduction in the systemic vascular resistance, and alpha-1 activity, to an even lesser extent, whose vasoconstrictive effects are negated by the baroreceptor mediated response and beta-2 activity.