A client is unresponsive and pulseless, and the monitor shows a flat line. The nurse asks for the defibrillator. Which statement about this rhythm is correct?

1. 1A synchronized shock should be given at the R wave
2. 2A shock is the first treatment because the rhythm is shockable
3. 3A shock will not help because no electrical impulses are present
4. 4A shock is needed only after the first dose of an antidysrhythmic

Source: Nursing Advanced Skills (Open RN, Chippewa Valley Technical College, 2023), Interpret Basic ECG: Ventricular Rhythms. Licensed under CC BY 4.0.