When severe reactions occur after antivenom infusion, what immediate action should be taken?

Stopping the antivenom infusion and following the anaphylaxis protocol is the appropriate immediate action to take when severe reactions occur after antivenom infusion. Severe allergic reactions, including anaphylaxis, can occur in response to antivenom due to the foreign proteins introduced into the body. Recognizing these reactions early is critical to ensuring patient safety.

Following the anaphylaxis protocol typically involves discontinuing the offending medication (in this case, the antivenom) and initiating appropriate treatment, such as administering epinephrine, oxygen, intravenous fluids, and other supportive measures as needed. This prompt response aims to stabilize the patient and mitigate the potentially life-threatening symptoms that may arise from anaphylaxis.

Other options can be relevant in different contexts but do not address the immediate need for action in an acute reaction scenario. Administering a higher dose of antivenom would likely exacerbate the situation, while simply monitoring the patient or administering corticosteroids without addressing the immediate threat can lead to delays in necessary treatment. Therefore, stopping the infusion and implementing the anaphylaxis protocol is the correct action to ensure patient safety during such severe reactions.