Final answer:
Cardiac medications are not effective in severely hypothermic patients in cardiac arrest. Active rewarming procedures and warm fluid administration are more appropriate interventions.
Step-by-step explanation:
In severely hypothermic patients in cardiac arrest, cardiac medications are generally not effective and may potentially cause toxic accumulation of the medications (option C). The extreme cold temperature in hypothermic patients slows down the heart's rate and strength of contractions. This is a component of the diving reflex that diverts blood to essential organs while submerged. In such cases, active rewarming procedures and warm fluid administration are more appropriate interventions to revive the patient.