Comprehensive Notes on ER Triage, Disaster Management, and Trauma Care

Emergency and Disaster Triage Systems

Emergency Room (ER) triage follows the principle of "the worst, though, first." Patients are prioritized based on the severity of their condition. Those with non-emergencies may wait extended periods, such as eight hours, because they are not a medical priority.
Mass Casualty Incident (MCI) or disaster triage operates on a different principle: saving the greatest number of people using the fewest resources. This is sometimes described as "the worst get rehearsed," meaning the focus is on salvageable patients rather than those who are already deceased or those requiring excessive resources.
In a disaster, if a patient requires CPR, they are often tagged as Black (deceased/expectant) because CPR is a high-resource intervention that is unlikely to be successful in a mass casualty environment.

Disaster Triage Tagging System

Red Tags (Emergent): These are the top priority. These patients have life-threatening injuries that are quickly fixable with minimal resources. Examples include:
- Arterial bleeds (controlled with a hemostat or tourniquet).
- Sucking chest wounds (managed with an occlusive dressing).
- Tension pneumothorax.
- Airway obstruction (stridor).
Yellow Tags (Urgent): These patients have significant injuries but are not in immediate danger of death. They are essentially everyone remaining after Red and Black tags are identified.
Green Tags (Non-urgent/"Walking Wounded"): These patients could potentially survive for days without immediate intervention.
Black Tags (Expectant/Deceased): These patients are either dead or have injuries so severe that they would require an unrealistic amount of resources to save (the "Humpty Dumpty" analogy). Examples include:
- Full-thickness burns over $70\%$ of the body, requiring extensive surgical units and grafts.
- Crush syndrome where the patient is unstable and requires massive intervention.

Specific Pathologies in Trauma

Crush Syndrome

This occurs when a body part is pinned or crushed, often seen in car accidents or building collapses.
Inside crushed cells, there is a high concentration of potassium ( $K^+$ ).
While the limb is crushed, the pressure acts as a tamponade, stopping circulation to the area. When the pressure is removed, the crushed cells release potassium into the systemic circulation.
This sudden surge of potassium hits the heart, potentially causing an unstoppable heart attack or lethal arrhythmia.
Field management may involve applying a tourniquet before removing the crushing object or, in extreme cases, field amputation to control the release of cellular contents.

Flail Chest

This condition occurs when at least two or more ribs are broken in two or more places (on each end).
It results in "paradoxical breathing," where the injured section of the chest moves in the opposite direction of the rest of the chest (sinking during inspiration and bulging during expiration).
Pain management is a priority for flail chest because the intense pain prevents the patient from taking deep breaths, leading to hypoventilation and potential respiratory failure.

Tension Pneumothorax

A life-threatening condition where air enters the pleural space through a hole (often a gunshot wound) but cannot escape.
This creates a "one-way valve" effect, where air builds up, collapsing the lung and eventually shifting the mediastinum.
Tracheal Deviation: A classic, late-stage sign of tension pneumothorax. The trachea deviates away from the affected/injured side or toward the unaffected side.
The builds-up of pressure can also compress the aorta, cutting off blood supply and oxygen output to the body.
Immediate treatment involves placing an occlusive dressing over the hole to prevent more air from entering.

Cardiac Tamponade

This is the result of fluid or blood filling the tough, fibrous sac (pericardium) surrounding the heart.
Because the sac cannot stretch, the fluid "strangles" the heart, preventing it from relaxing and filling with blood. If the heart cannot fill, it cannot pump.
Beck's Triad: The clinical signs used to identify cardiac tamponade:
1. Decreased blood pressure (hypotension).
2. Jugular Venous Distention (JVD).
3. Muffled or distant heart sounds (it sounds like the heart is "underwater").
Treatment: Pericardiocentesis, which involves inserting a large-bore needle through the pericardium to drain the accumulated fluid.

Primary Survey and Airway Management

The primary survey is the initial assessment performed to identify life threats in the order of ABCDE: Airway, Breathing, Circulation, Disability, and Exposure.
Airway Adjuncts:
- NPA (Nasopharyngeal Airway / Nasal Trumpet): Used in patients who are awake. These are inserted through the nostrils. Pins may be used to prevent them from slipping out.
- OPA (Oropharyngeal Airway): An airway used in unconscious patients to keep the tongue from obstructing the throat.
- Endotracheal Tube (ET Tube): The definitive airway used for intubation, reaching down the trachea into the lungs.
Anaphylaxis Management: This involves treating bronchoconstriction (airway closure) and vasodilation (low blood pressure). The drug of choice is Epinephrine at a $1:1,000$ concentration.

Circulatory Support and Blood Transfusion

In trauma cases, the preferred intravenous fluid for resuscitation is Lactated Ringer's ( $LR$ ). It is often favored over normal saline in trauma units, although it is more expensive.
Universal Donor: O Negative ( $O^-$ ) blood.
Universal Recipient: AB Positive ( $AB^+$ ) blood.
Large-bore IV access (two sites) is critical for rapid fluid and blood replacement in circulatory emergencies.

Professional Conduct and Field Realities

Commotio Cordis: A phenomenon where a blunt trauma to the chest occurs at a specific, vulnerable point in the heart's electrical cycle, causing immediate cardiac arrest. This was notably observed in the case of football player Damar Hamlin.
Spinal Precautions: In many trauma scenarios, stabilizing the spine is a subconscious priority for trained responders. For example, a probie (probationary firefighter) might instinctively hold a patient's spine during a horrific rebar impalement rescue.
Firefighting Culture: Firefighters often work a "Kelly schedule" (e.g., 24 hours on, 24 off, 24 on, 48 off, etc.). Probation typically lasts one to two years, during which a firefighter can be fired for any reason. This period is used to evaluate not just job skills but how well the individual integrates into the team environment.
Nursing Environment: While there isn't always a formal one-year probation like in the fire department, nurses must be able to work as a team. Helpful behavior, such as assisting a colleague with critical patients rather than staying on a phone during downtime, is essential for professional survival.

Questions & Discussion

Q: Why don't hospitals advertisements say, "If you don't have an emergency, go elsewhere," or tell people in the ER that an urgent care is nearby?A: There isn't a completely satisfactory answer, but part of the reason is that hospitals are businesses and the ER generates significant revenue. Additionally, wait times have increased significantly over the years; it used to be common to be seen in an hour or two, but now the triage system is strictly enforced.

Q: In a disaster scenario, would you prioritize a 25-year-old with abdominal pain?A: No. In a standard ER, you might be empathetic, but in a disaster, you look for life-threatening issues. A patient hit their head but is talking might be a lower priority than someone with an airway issue. If the 25-year-old just has "tummy pain," they are low on the list.

Q: Why is the three-year-old with burns considered a Black Tag in a disaster?A: Under normal emergency conditions, a child is a top priority. However, in a disaster triage (MCI), a patient with burns over $70\%$ of their body is a Black Tag because saving them would require a full surgical unit, multiple nurses, and grafts—resources that are not available in the middle of a mass casualty event.