Final answer:
The correct epinephrine dosing regimen for PEA or asystole is 1 mg IV/IO repeated every 3 to 5 minutes, as per ACLS guidelines. This option C is lifesaving in anaphylactic shock by increasing blood pressure and relaxing bronchial muscles.
Step-by-step explanation:
The correct dosing regimen of epinephrine to treat pulseless electrical activity (PEA) or asystole in adults, according to the Advanced Cardiovascular Life Support (ACLS) guidelines, is 1 mg IV/IO, repeated every 3 to 5 minutes. Therefore, the correct answer to the question is option C: 1 mg IV/IO - repeated every 3 to 5 minutes. It is critical to remember that epinephrine can be a lifesaving medication when used appropriately, especially in situations such as anaphylactic shock where it counteracts the effects of systemic mast cell degranulation by raising blood pressure and relaxing bronchial smooth muscle.