Final answer:
The correct statement about the effects of epinephrine during resuscitation is that it stimulates spontaneous contractions when asystole is present. Epinephrine causes vasoconstriction, increases peripheral vascular resistance, and acts as a positive inotrope to enhance cardiac function during emergencies.
Step-by-step explanation:
Epinephrine is a critical drug in resuscitation and its effects during cardiac emergencies can be life-saving. Among the statements provided in the question, the correct one about the effects of epinephrine during resuscitation is C: Epi stimulates spontaneous contractions when asystole is present.
Epinephrine reacts with both alpha and beta adrenoreceptors. At high concentrations, it tends to cause vasoconstriction, which increases peripheral vascular resistance and, in turn, increases blood pressure. This vasoconstrictive action helps to restore cardiac output during resuscitation by increasing venous return and enhancing blood flow to critical organs. As a strong positive inotrope, it also increases the force of heart contractions.
Contrary to other choices presented, epinephrine does not decrease myocardial oxygen consumption or peripheral vascular resistance, nor is it contraindicated in ventricular fibrillation (v fib). In fact, it is commonly used during cardiac arrest regardless of the rhythm, including v fib.