Final answer:
Lidocaine is given to someone following cardiac arrest to prevent arrhythmias.
Step-by-step explanation:
The correct answer is c) Prevent arrhythmias. Lidocaine, also known as Xylocaine, is a medication commonly used in cardiac arrest situations to prevent or treat arrhythmias. Arrhythmias are abnormal heart rhythms that can occur during or after cardiac arrest. Lidocaine works by blocking sodium channels in the heart, which helps to stabilize the heart's electrical activity and prevent or control dangerous arrhythmias. It does not increase heart rate, induce vasodilation, or reduce blood clot formation.