The telemetry monitor alarms for your client. The 6 second rhythm strip is seen here. Your first action is to:

A. Give 2 rescue breaths: In cardiac arrest due to V.Fib, the priority is circulation. High-quality chest compressions are initiated immediately to maintain perfusion until defibrillation can be performed. Rescue breaths are not the first step. B. Start chest compressions: V.Fib is a lethal rhythm with no effective cardiac output. Immediate chest compressions are essential to circulate oxygenated blood to vital organs while preparing for defibrillation. This is the first action in Basic Life Support (BLS) and Advanced Cardiac Life Support (ACLS). C. Assess the client: While assessment is important, in the context of a witnessed rhythm strip showing V.Fib and an alarm, the nurse should assume cardiac arrest and act immediately. Delaying compressions to reassess wastes critical seconds. D. Call a code blue/call 911: This is necessary, but it comes after starting chest compressions. The priority is to begin CPR without delay, then activate emergency response and prepare for defibrillation.