What is the rescue agent for dobutamine?

The rescue agent for dobutamine is esmolol. Dobutamine is a medication primarily used for heart failure management and for increasing cardiac output. However, its use can lead to increased heart rate and other adrenergic effects. In situations where the adverse effects of dobutamine need to be quickly countered, esmolol, a short-acting beta-blocker, is used. Esmolol can effectively reduce heart rate and myocardial oxygen demand during episodes of tachycardia or arrhythmia induced by dobutamine.

The other options are not used as rescue agents for dobutamine. Adenosine is typically used for the rapid termination of certain types of supraventricular tachycardia but does not counteract dobutamine's effects. Aminophylline is a non-selective phosphodiesterase inhibitor and is used in conditions like asthma but isn't a traditional rescue agent for dobutamine. Regadenoson is a pharmacologic stress agent used in myocardial perfusion imaging and is not utilized to counteract the cardiovascular effects of dobutamine. Thus, esmolol is the most appropriate rescue agent when the effects of dobutamine need to be mitigated.