# A nurse is working in the emergency department during a mass casualty incident. Multiple patients arrive simultaneously at the emergency department following a building collapse. Which patient should receive the highest priority for immediate treatment according to triage principles?

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> subject: Adult Health

## 문제

A nurse is working in the emergency department during a mass casualty incident. Multiple patients arrive simultaneously at the emergency department following a building collapse. Which patient should receive the highest priority for immediate treatment according to triage principles?

## 보기

1. A 45-year-old male with an open femur fracture, stable vital signs, and alert mental status
2. A 30-year-old female with multiple abrasions, complaining of severe pain, vital signs stable
3. A 60-year-old male with cardiac arrest who has been down for 15 minutes with no pulse
4. A 25-year-old female with respiratory distress, decreased breath sounds on the right side, and tachypnea **✔ 정답**

**정답: 4**

## 해설

In mass casualty triage, patients are prioritized based on the likelihood of survival with immediate intervention. The patient with respiratory distress and decreased breath sounds likely has a pneumothorax or hemothorax requiring immediate intervention to save life.

Emergency department triage in mass casualty situations follows special principles to save as many lives as possible with limited resources. The triage system prioritizes patients based on severity and the likelihood of survival if treated immediately.

A 25-year-old woman with decreased breath sounds on the right side, respiratory distress, and tachycardia shows classic signs of tension pneumothorax or hemothorax. This is a life-threatening condition requiring emergency treatment such as immediate needle decompression or chest tube insertion. Without rapid treatment, death is highly likely, but with immediate intervention, the chance of survival is very high.

The patient with an open femoral fracture has severe trauma but is hemodynamically stable with stable vital signs and clear consciousness. This patient is not in immediate life-threatening danger and can wait for treatment. The patient with multiple abrasions has stable vital signs and no immediate risk. The patient who has been in cardiac arrest for 15 minutes would be classified as expectant (black tag) in a mass casualty situation, making it appropriate to focus resources on patients with a higher chance of survival.

Triage principles prioritize patients who are critical but can be saved with immediate intervention. The patient with respiratory problems fits this category perfectly, so immediate treatment is the top priority to prevent deterioration and death.

## 심화 해설

Understanding Triage in a Mass Casualty Incident

In a mass casualty incident (MCI), the fundamental principle of care shifts from individual patient needs to providing the greatest good for the greatest number of people. The goal of triage is to rapidly sort patients based on the severity of their condition and their likelihood of survival with immediate medical intervention. The Simple Triage and Rapid Treatment (START) system, a widely taught and utilized protocol, categorizes patients into four color-coded groups: Immediate (Red), Delayed (Yellow), Minimal (Green), and Expectant (Black) [3]. The Sort-Assess-Lifesaving Interventions-Treatment/Transport (SALT) protocol offers a similar algorithmic approach, emphasizing global sorting followed by individual assessment and lifesaving interventions [4]. Both systems prioritize patients with life-threatening conditions who are salvageable with prompt care.

Analysis of Patient Presentations

Applying these triage principles to the patients arriving after the building collapse allows for a systematic determination of priority.

- Option 1: A 45-year-old male with an open femur fracture, stable vital signs, and alert mental status. This patient has a significant but non-life-threatening injury. Stable vital signs and an alert mental status indicate he is not in immediate danger of losing life or limb. According to START triage, he would be classified as Delayed (Yellow). He requires treatment, but it can be safely postponed while more critical patients are managed.

- Option 2: A 30-year-old female with multiple abrasions, complaining of severe pain, vital signs stable. This patient’s injuries are superficial, and her vital signs are stable. Pain, while distressing, is not an immediate threat to life. She would be triaged as Minimal (Green), often referred to as the "walking wounded." She can wait for an extended period without a significant change in outcome.

- Option 3: A 60-year-old male with cardiac arrest who has been down for 15 minutes with no pulse. In an MCI, resources are scarce and must be allocated to those with a reasonable chance of survival. A patient in traumatic cardiac arrest with a prolonged down time exceeding 10 minutes has an extremely low probability of survival, even with extensive resuscitation efforts. In the START system, a patient who is apneic even after a basic airway maneuver is classified as Expectant (Black). Initiating cardiopulmonary resuscitation (CPR) on this patient would consume significant staff and equipment resources that could be used to save multiple other patients with survivable injuries. The triage principle here is to recognize clinical futility in the context of overwhelming demand.

- Option 4: A 25-year-old female with respiratory distress, decreased breath sounds on the right side, and tachypnea. This patient presents with a classic life-threatening condition: a tension pneumothorax. The combination of respiratory distress, unilateral decreased breath sounds, and tachypnea indicates a critical respiratory compromise. In START triage, a patient with a respiratory rate greater than 30 breaths per minute is immediately categorized as Immediate (Red) [3]. This condition is rapidly fatal if not decompressed, yet it is reversible with a simple lifesaving intervention like needle thoracostomy. The SALT protocol similarly prioritizes this patient, as the assessment would reveal respiratory distress requiring a lifesaving intervention [4]. This patient has a high probability of survival if treated immediately, making her the highest priority.

Why the Other Options Are Lower Priority

The core of MCI triage is distinguishing between patients who need immediate life-saving intervention (Red), those who are critically ill but will not survive despite maximal care (Black), and those who can safely wait (Yellow and Green). The patient in Option 4 is the only one presenting with a clear, immediately reversible threat to the airway, breathing, or circulation (the "ABCs") that can be managed with a rapid procedure. The patient in Option 3, while also having a critical ABC issue, has a condition that is not survivable in the MCI context, making him a lower priority for resource allocation. This decision-making process, while ethically challenging, is the cornerstone of effective MCI response and is a critical competency assessed on the NCLEX-RN [1,2].References (research sources)

- [3]Simulated Mass Casualty Incident Triage Exercise for Training Medical Personnel.Research articleRajagopal AB, Jasperse N, Osborn MB. (2020) · DOI: 10.21980/j82h1r

- [4]Implementation of a workshop for mass casualty incident triage training using an immersive virtual reality simulation.Research articleKman NE, McGrath J, Panchal AR, Malone M, Sharkey-Toppen T, Way DP. (2024) · DOI: 10.1002/aet2.10939

## 임상 시나리오

MCI Triage: START ProtocolRapid sorting for life-threatening, reversible conditions
In a mass casualty incident, the Immediate (Red) priority is for patients with a life-threatening condition that can be reversed with minimal resources, such as a tension pneumothorax.

Assess Respirations, Perfusion, and Mental Status (RPM). A patient with a respiratory rate over 30/min, absent radial pulse, or altered consciousness is tagged Immediate (Red).

CautionDo not start CPR on a pulseless, apneic patient in an MCI. They are classified as Expectant (Black) to conserve resources for those with a higher survival probability.

## 핵심 개념

- **Mass Casualty Incident (MCI)** — An event that overwhelms local healthcare resources, requiring a shift from individual patient care to providing the greatest good for the greatest number.
- **START Triage** — Simple Triage and Rapid Treatment; a system that categorizes patients into Immediate (Red), Delayed (Yellow), Minimal (Green), and Expectant (Black) based on respiration, perfusion, and mental status.
- **Tension Pneumothorax** — A life-threatening condition where air enters the pleural space and cannot escape, causing lung collapse, mediastinal shift, and cardiovascular compromise, indicated by respiratory distress and decreased breath sounds.
- **Expectant (Black) Category** — A triage category for patients whose injuries are so severe that they are unlikely to survive even with extensive resource use, such as those in cardiac arrest in an MCI setting.
- **Immediate (Red) Category** — The highest triage priority for patients with life-threatening conditions who can be stabilized with immediate, simple interventions.

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