Final answer:
The only drug typically used for PEA and asystole during resuscitation is epinephrine, as opposed to β-blockers like metoprolol and propanolol, which are used to manage cardiovascular diseases.
Step-by-step explanation:
The only drug we typically administer for pulseless electrical activity (PEA) and asystole in a resuscitation scenario is epinephrine. Both PEA and asystole are types of cardiac arrest rhythms where there is no effective heart beat, and immediate treatment is critical. Epinephrine is given as it can stimulate the heart and vasculature due to its action on α- and β-adrenergic receptors. In contrast, the sympatholytic drugs such as β-blockers like metoprolol and propanolol are used to treat cardiovascular diseases by preventing vasoconstriction and cardioacceleration, which is a different therapeutic approach than the one used in cardiac arrest situations.