How does lidocaine function in a CPR setting?

Lidocaine functions in a CPR setting primarily by decreasing automaticity, which is the ability of cardiac cells to depolarize spontaneously and initiate action potentials. During certain arrhythmias, especially ventricular tachycardia and ventricular fibrillation, there is an increased automaticity that can lead to ineffective heart rhythms. By administering lidocaine, it stabilizes the neuronal membranes and reduces the occurrence of these spontaneous depolarizations, ultimately helping to restore a more organized and effective rhythm.

In the context of advanced cardiac life support, managing the rhythm and electrical stability of the heart is crucial, and lidocaine's antiarrhythmic properties play a key role in achieving that goal. Its use in this context helps to mitigate the risk of further arrhythmias during resuscitation efforts.