Final answer:
Monitoring the patient is the first step after asystole post-Adenosine administration for PSVT, followed by adherence to ACLS protocols including possible CPR and AED use, if necessary.
Step-by-step explanation:
When a patient with Paroxysmal Supraventricular Tachycardia (PSVT) is administered Adenosine and subsequently exhibits asystole, the primary step is to continually monitor the patient. Asystole after Adenosine can be a brief and expected part of the therapeutic process. It is important to observe closely for the return of a normal sinus rhythm. If the asystole persists, standard Advanced Cardiac Life Support (ACLS) protocols should be followed, which may include CPR and the use of an Automated External Defibrillator (AED) as indicated. In most cases, asystole after Adenosine is transitory, and the heart rhythm typically resumes, often with correction of the PSVT. However, if the asystole continues for more than a few seconds, or if the patient becomes unstable, immediate resuscitation efforts should be initiated.