Which of the following drug classes would be used to help manage an animal in cardiac arrest?

The management of an animal in cardiac arrest often involves the use of adrenergic (sympathomimetic) drugs. These drugs are designed to stimulate the sympathetic nervous system, leading to increased heart rate, blood pressure, and myocardial contractility—all crucial factors when addressing cardiac arrest. The activation of alpha and beta adrenergic receptors helps to restore circulation and improve the chances of effective resuscitation.

In situations of cardiac arrest, agents such as epinephrine, which falls under the adrenergic drug class, are commonly administered. Epinephrine acts on both alpha- and beta-adrenergic receptors, resulting in vasoconstriction and increased cardiac output, thereby improving perfusion to vital organs during resuscitation efforts.

The other drug classes mentioned do not play a direct role in managing cardiac arrest. Cholinergic agents would generally slow down the heart rate and are not suitable in emergencies where an accelerated heart function is needed. Beta blockers work to decrease heart rate and myocardial workload, which is counterproductive in scenarios requiring immediate cardiac stimulation. Anticholinergics, although they can increase heart rate, are typically not the first line in resuscitation protocols during cardiac arrest.

Overall, the use of adrenergic (sym