Final answer:
The next step after confirming a shockable rhythm with no pulse on the ECG monitor is to promptly perform defibrillation. If the rhythm is ventricular fibrillation or pulseless ventricular tachycardia, using a defibrillator can reestablish a normal sinus rhythm and may save the patient's life, followed by continued high-quality chest compressions according to ACLS guidelines.
Step-by-step explanation:
After completing 2 minutes of CPR and observing a lead II rhythm on the ECG monitor with no pulse, the correct next step is to perform defibrillation if the rhythm is shockable, which includes rhythms such as ventricular fibrillation or pulseless ventricular tachycardia. In this scenario, since another team member has resumed chest compressions and an IV is already in place, defibrillation should be performed as soon as possible with the goal of reestablishing a normal sinus rhythm. The role of a defibrillator is crucial in this case, as it delivers a large burst of electrical charge to the heart, potentially stopping irregular rhythms like ventricular fibrillation, and allowing the heart's natural pacemaker to restore a normal rhythm. Automated external defibrillators (AED) have made it possible for nonmedical personnel to deliver lifesaving defibrillation in public settings. After the defibrillation attempt, it is important to continue high-quality chest compressions and follow Advanced Cardiac Life Support (ACLS) algorithm for further treatment actions, including possible administration of medications like epinephrine and assessment for reversible causes if the patient's condition does not improve.