A nurse is working in the emergency department when a mass casualty incident involving a chemical spill occurs. Multiple patients arrive with varying degrees of exposure. What is the nurse's first priority action?

In mass casualty incidents involving chemical exposure, decontamination and personal safety must be the absolute first priority before any patient care activities begin.

Core Nursing Explanation Key Concept Analysis: This question tests the fundamental principle of Hazardous Material (HazMat) response and Disaster Triage in a mass casualty incident (MCI). The core theme is the Key Point! safety of the healthcare team and the integrity of the healthcare facility. In incidents involving chemical, biological, radiological, or nuclear (CBRN) agents, the primary threat is secondary contamination—bringing the hazardous substance into the hospital, which can incapacitate staff and shut down the entire emergency department (ED).

Answer Rationale: The correct answer is to Establish decontamination procedures and ensure personal protective equipment (PPE) is worn. This is the non-negotiable first step. The rationale is based on the principle of "Protect Yourself First." Without proper decontamination, contaminated patients pose a direct health risk to nurses, physicians, and other patients. Furthermore, an unprotected healthcare worker who becomes a casualty cannot help anyone. Ensuring PPE (e.g., Level C suits with respirators) is donned and setting up a decontamination corridor (often outside the ED entrance) are immediate actions that secure the treatment environment.

Distractor Analysis:
Watch out for confusion! Option ②, "Begin immediate assessment and treatment," violates the primary safety rule. Rushing to treat a chemically contaminated patient without decontamination leads to provider exposure and spreads contamination.
Option ③, "Contact the hospital administrator," is an important step but is not the first action. The nurse on the scene must initiate immediate safety protocols. The emergency response plan should already be known and activated by the initial notification.
Option ④, "Set up triage areas," is a critical early step in any MCI. However, in a HazMat event, triage occurs AFTER or concurrent with decontamination. You cannot safely assess and categorize patients who are still covered in a hazardous substance. The triage area itself must be in the "clean" zone, established post-decontamination.

Related Concepts: This integrates disaster nursing, infection control principles (extended to chemical contamination), and the nursing roles within the Hospital Incident Command System (HICS). The sequence is: 1) Scene Safety/PPE, 2) Decontamination, 3) Triage, 4) Treatment.

Nursing Clinical Practice Guide Clinical Scenario: You are the charge nurse in the ED when EMS radios in: "Bus accident with possible industrial chemical leak. 15 patients inbound, ETA 8 minutes. Multiple patients reporting burning skin and respiratory distress."

Nursing Intervention Strategy:
1. Immediate Action (Your Priority): Don appropriate PPE immediately (as per your hospital's HazMat protocol). Simultaneously, direct staff to set up the external decontamination station—this often involves fire department collaboration. Patients must be met outside and decontaminated (typically with water showers) before entering the ED.
2. Triage in the "Warm Zone": A triage officer in full PPE may perform a quick assessment in the decontamination area to prioritize the order of decontamination (e.g., ambulatory vs. non-ambulatory).
3. Post-Decontamination Flow: Once decontaminated and moved to the "cold zone" (clean treatment area), standard MCI triage (e.g., using the START triage system) is performed to categorize patients into Immediate (Red), Delayed (Yellow), Minor (Green), or Expectant (Black).

Patient Safety and Precautions: Never allow contaminated clothing or belongings into the clean treatment area. All water runoff from decontamination must be contained. Documentation of the decontamination process is crucial for legal and medical follow-up.

Nursing Procedure & Medication Flow The procedure here is the Decontamination Process:
1. PPE Donning: Follow your facility's protocol for the suspected agent. This is non-negotiable.
2. Gross Decontamination: Remove all patient clothing (cuts exposure by up to 90%).
3. Wet Decontamination: Wash with copious amounts of water and mild soap. Use gentle brushing for persistent contaminants. Avoid vigorous scrubbing which can break the skin.
4. PPE Doffing: After patient care, remove PPE in a specific sequence to avoid self-contamination, followed by a thorough shower.

A Word from Your Senior Nurse "In a crisis, your instinct is to run toward the most critically injured patient to help. That's the heart of a nurse. But in a HazMat situation, that instinct can get you and your colleagues seriously hurt or killed, shutting down the entire department. Remember the mantra: 'The scene is not safe until you make it safe.' Your first patient in a chemical spill is the environment itself. By securing decontamination, you protect your team, preserve your hospital's ability to function, and ultimately save more lives. On the NCLEX, they love to test this 'safety first' principle in unconventional emergencies."