A 68-year-old patient in the ICU is experiencing ventricular fibrillation. The nurse is preparing to assist with defibrillation. What is the most critical assessment the nurse must perform immediately before the defibrillator is charged?

Scenario: A patient in ventricular fibrillation (VF) requires immediate defibrillation in the ICU. The nurse must prioritize team safety immediately before charging the defibrillator.

• Verbal Command: The team leader or defibrillator operator must loudly and clearly announce "Charging defibrillator. Everybody clear!" or a similar standardized phrase.
• Visual Sweep: Visually confirm that all personnel are not touching the patient, the bed, or any connected equipment (e.g., ventilator tubing, IV poles). This includes the person managing the airway, who must momentarily stop bag-mask ventilation and step back.
• Oxygen Safety: Ensure oxygen sources, such as a bag-valve-mask device, are moved at least 1 meter away from the patient's chest to prevent fire hazard from sparking.
• Final Check Before Shock: After charging, immediately before delivering the shock, perform a second visual sweep and announce "I'm clear, you're clear, everybody's clear. Shocking now!"

Defibrillation delivers up to 360 joules of electrical energy. Accidental contact with the patient or conductive surfaces during shock delivery can result in serious electrical injury or cardiac arrhythmias in a healthcare worker. This safety step is the absolute priority over other assessments like pulse checks or energy verification at the moment of charge and delivery.