5.2 Emergency Medicine, Critical Care & Trauma
Key Takeaways
- The Emergency Severity Index (ESI) is a 5-level triage algorithm prioritizing patients based on acuity and anticipated resource utilization.
- Acute Myocardial Infarction care relies on rapid identification of cardiac symptoms, diagnostic ECG/troponin testing, and initial MONA therapy.
- Acute ischemic stroke evaluation relies on the FAST acronym and NIHSS scoring to determine eligibility for IV thrombolytics (tPA) within a narrow therapeutic time window.
- Trauma resuscitation strictly adheres to the primary survey ABCDE protocol (Airway, Breathing, Circulation, Disability, Exposure).
5.2 Emergency Medicine, Critical Care & Trauma
Triage & Emergency Department Workflow
Emergency medicine focuses on the immediate decision-making and action required to prevent death or significant disability in patients presenting with acute illnesses or injuries. Upon arrival in the Emergency Department (ED), patients undergo triage—the systematic sorting of patients based on clinical urgency.
The most widely adopted triage tool in North America is the Emergency Severity Index (ESI), a 5-level algorithm that categorizes patients based on disease severity and expected resource needs:
| ESI Level | Category | Clinical Description | Representative Examples |
|---|---|---|---|
| ESI Level 1 | Resuscitation | Immediate, life-saving intervention required without delay; patient is unreactive or in respiratory/cardiac arrest. | Anaphylactic shock, cardiac arrest, massive trauma with severe hemorrhage, gunshot wound to chest. |
| ESI Level 2 | Emergent | High-risk situation, confusion/lethargy/disorientation, or severe pain/distress. Time-critical intervention needed. | Acute chest pain (suspected MI), acute stroke signs, severe asthma exacerbation, ectopic pregnancy. |
| ESI Level 3 | Urgent | Patient is stable but requires two or more diagnostic or therapeutic resources. | Abdominal pain requiring blood work, abdominal CT scan, and IV fluids; complex laceration. |
| ESI Level 4 | Less Urgent | Patient is stable and expected to require one diagnostic or therapeutic resource. | Simple sprain requiring a single X-ray; uncomplicated urinary tract infection needing urine culture. |
| ESI Level 5 | Non-Urgent | Patient is stable and requires no resources (examination and prescription only). | Suture removal, medication refill, rash without systemic symptoms. |
Acute Cardiovascular Emergencies
When patients present with acute chest pain, healthcare teams immediately work to rule out an Acute Coronary Syndrome (ACS), which ranges from unstable angina to non-ST-elevation myocardial infarction (NSTEMI) and ST-elevation myocardial infarction (STEMI).
Key clinical assessments and treatments include:
- Diagnostic Testing: A 12-lead Electrocardiogram (ECG/EKG) performed within 10 minutes of arrival to identify ST-segment elevation. Blood tests measure cardiac biomarkers, specifically Troponin I and Troponin T, which leak into the bloodstream when myocardial cell necrosis occurs.
- Initial Medical Management (MONA Protocol):
- M - Morphine: Administered IV to relieve severe chest pain and reduce myocardial oxygen demand.
- O - Oxygen: Supplemental oxygen delivered if arterial saturation ($SpO_2$) drops below 90%.
- N - Nitroglycerin: Sublingual or IV vasodilator that dilates coronary arteries, increasing blood flow and decreasing preload.
- A - Aspirin: Chewed antiplatelet therapy (162–325 mg) that inhibits platelet aggregation and prevents further thrombus growth.
- Reperfusion Therapy: For STEMI patients, emergency Percutaneous Coronary Intervention (PCI) (cardiac catheterization with stent placement) is preferred within a target "door-to-balloon" time of 90 minutes. If PCI is unavailable, fibrinolytic therapy (clot-busters) is considered.
Neurological Emergencies & Stroke Management
A Cerebrovascular Accident (CVA), or stroke, occurs when cerebral blood supply is interrupted (Ischemic Stroke, ~85% of cases) or when a cerebral blood vessel ruptures (Hemorrhagic Stroke, ~15% of cases). "Time is brain"—approximately 1.9 million neurons die each minute an ischemic stroke goes untreated.
Public and clinical stroke recognition utilizes the FAST acronym:
- F - Face: Facial drooping or asymmetry when asking the patient to smile.
- A - Arm: Arm drift when asking the patient to extend both arms palms-up with eyes closed.
- S - Speech: Slurred speech, inappropriate word choice, or inability to speak (aphasia).
- T - Time: Time of symptom onset (or "last known well" time) and immediate call to emergency services.
Thrombolytic Therapy: For acute ischemic stroke, intravenous tPA (tissue Plasminogen Activator / Alteplase) must be administered within a strict window—typically within 3 to 4.5 hours from the last known well time—after a non-contrast head CT scan rules out intracranial hemorrhage. Determining the exact time of symptom onset from non-English speaking patients or family members is a critical, life-saving interpreting task.
Trauma Resuscitation & Shock Classification
Trauma resuscitation in dedicated trauma bays follows the Advanced Trauma Life Support (ATLS) Primary Survey (ABCDE) protocol to rapidly identify and treat immediately life-threatening injuries:
- A - Airway with Cervical Spine Protection: Ensuring airway patency while maintaining inline cervical stabilization.
- B - Breathing and Ventilation: Assessing chest expansion, auscultating breath sounds, and managing tension pneumothorax or open chest wounds.
- C - Circulation with Hemorrhage Control: Assessing pulses, blood pressure, skin perfusion, and stopping external bleeding via direct pressure or tourniquets.
- D - Disability (Neurological Status): Rapid assessment of level of consciousness using the Glasgow Coma Scale (GCS) (evaluating Eye opening 1–4, Verbal response 1–5, Motor response 1–6; total score 3–15) and pupil reactivity.
- E - Exposure / Environmental Control: Undressing the patient completely to inspect for hidden injuries while aggressively preventing hypothermia with warm blankets and heated IV fluids.
Shock Classifications: Shock is defined as state of systemic tissue hypoperfusion leading to cellular hypoxia:
- Hypovolemic Shock: Loss of intravascular volume (massive hemorrhage in trauma or severe dehydration).
- Cardiogenic Shock: Primary pump failure (severe MI, end-stage cardiomyopathy).
- Distributive Shock: Severe vasodilation and altered vascular tone. Includes Septic Shock (systemic infection response), Anaphylactic Shock (severe IgE-mediated allergic reaction), and Neurogenic Shock (spinal cord injury).
- Obstructive Shock: Physical restriction of cardiac filling or outflow (Pulmonary Embolism, Tension Pneumothorax, Cardiac Tamponade).
Critical Care Procedures & Life Support
In Intensive Care Units (ICU) and trauma suites, interpreters encounter invasive life-support interventions:
- Endotracheal Intubation: Insertion of a flexible plastic tube into the trachea via the mouth to maintain an open airway and connect to a mechanical ventilator.
- Chest Tube (Tube Thoracostomy): Insertion of a tube into the pleural space to drain air (pneumothorax), blood (hemothorax), or fluid (pleural effusion).
- Code Blue: Hospital emergency code for cardiac or respiratory arrest. Teams execute Advanced Cardiovascular Life Support (ACLS) protocols involving high-quality CPR, manual defibrillation for shockable rhythms (Ventricular Fibrillation / Pulseless Ventricular Tachycardia), and IV epinephrine/amiodarone administration.
Clinical Scenarios & Interpreter Strategies
- Scenario 1: High-Acuity Trauma Resuscitation: A patient arrives via ambulance following a rollover motor vehicle collision. Multiple trauma team members shout orders simultaneously. The interpreter positions themselves near the patient's head, focusing exclusively on translating direct inquiries from the trauma leader to the conscious patient and conveying patient responses clearly.
- Scenario 2: Establishing "Last Known Well" in Acute Stroke Code: A family arrives at the ED with an elderly patient who cannot speak. The neurologist needs to determine the exact time the patient was last seen normal to evaluate tPA eligibility. The interpreter ensures precise temporal translation without converting ambiguous family statements into assumptions.
- Scenario 3: ICU Family Meeting for End-of-Life Decisions: An interpreter facilitates a meeting where an intensivist discusses withdrawing mechanical ventilation for a patient with brain death. The interpreter maintains an empathetic, steady voice, accurately rendering complex medical prognoses and sensitive family responses.
Exam Traps & Best Practices
- MONA vs. FAST Trap: Do not confuse the cardiac MONA protocol (Morphine, Oxygen, Nitroglycerin, Aspirin) with the neurological FAST stroke screening tool (Face, Arm, Speech, Time).
- Glasgow Coma Scale Score Interpretation: Remember that a lower GCS score indicates deeper coma/impairment (GCS 3 is total unresponsiveness), whereas GCS 15 represents fully awake, alert, and oriented status ("GCS 8, intubate").
- Trauma Room Safety & Positioning: Interpreters must remain out of the physical pathway of trauma surgeons, nurses, and X-ray technicians while maintaining audible line of sight with the patient.
A patient presents to the emergency room with acute onset right-sided facial drooping, right arm weakness, and slurred speech that began 1 hour ago. What is the primary reason the provider urgently orders a non-contrast head CT scan?
In the Emergency Severity Index (ESI) triage system, how would a patient presenting with stable minor ankle pain requiring only a single X-ray be categorized?
During a trauma resuscitation, a patient is assessed using the Glasgow Coma Scale (GCS) and receives a total score of 6. What does this score indicate?