In the context of CPR, which medication is commonly administered for PEA?

In the context of CPR, the administration of epinephrine is a key component in the management of pulseless electrical activity (PEA). Epinephrine is a potent vasoconstrictor that enhances coronary perfusion pressure during cardiopulmonary resuscitation, which is crucial for improving the likelihood of return of spontaneous circulation (ROSC). It stimulates alpha-adrenergic receptors causing vasoconstriction, which helps to redirect blood to vital organs during periods of ineffective cardiac activity.

The other medications listed do not have the same role in the emergency treatment of PEA. For instance, adenosine is primarily used in certain types of tachyarrhythmias and would not be helpful in the context where there is no effective cardiac output. Lidocaine is indicated for ventricular arrhythmias and does not address the underlying issues present in PEA. Aspirin is an antiplatelet medication used to reduce the risk of clot formation and is typically not administered during active resuscitation where immediate circulatory support is necessary. The targeted use of epinephrine in this critical situation plays a vital role in attempting to restore effective cardiac rhythm and function.