ER for a Day: A Case Study in Triage and Diagnosis

Materials Needed

• A laptop or computer with internet access
• A whiteboard or large sheets of paper
• Dry-erase markers or colored pens
• A notebook and pen for personal notes
• A timer (phone timer is fine)
• Index cards (or a document for creating digital "patient files")
• Access to free online medical resources (e.g., Merck Manual, Khan Academy Medicine, WebMD)

1. Learning Objectives (60-90 Minutes)

By the end of this lesson, the student will be able to:

• Apply knowledge of the cardiovascular, respiratory, and nervous systems to analyze simulated clinical scenarios.
• Develop a differential diagnosis by distinguishing between potential conditions based on patient symptoms and vitals.
• Prioritize patient care by applying a simplified triage model (most urgent to least urgent).
• Create and communicate a clear, logical diagnostic and initial treatment plan for a patient.

2. Alignment with Pre-Medical Competencies

This lesson is designed to develop skills outlined by the Association of American Medical Colleges (AAMC) for pre-medical students, specifically:

• Critical Thinking: Using logic and reasoning to identify the strengths and weaknesses of alternative solutions or approaches to problems.
• Scientific Inquiry: Applying knowledge of the natural sciences to analyze and solve problems.
• Written Communication: Effectively conveying information in writing for a scientific/medical audience.

3. Instructional Sequence and Strategies

Part 1: The Hook & Briefing (10 minutes)

Step 1: Set the Scene

Watch a short (2-3 minute) clip of a realistic ER triage scene from a medical documentary or a high-quality show (e.g., the opening of an episode of "ER" or "The Good Doctor"). Discuss: What information were the doctors trying to get immediately? Why was speed so important?

Step 2: Doctor's Briefing - The ABCDEs

Introduce the core framework for emergency assessment. Explain that in any emergency, a doctor first stabilizes the patient by checking:

• A - Airway: Is it clear?
• B - Breathing: Is the patient breathing effectively? What is their oxygen saturation?
• C - Circulation: Do they have a pulse? What is their blood pressure and heart rate?
• D - Disability: What is their level of consciousness? Are they alert or confused?
• E - Exposure: Are there any other obvious injuries, rashes, etc.?

This is the foundation for all diagnostic thought in an emergency setting.

Part 2: The Main Activity - On Call in the ER (30-45 minutes)

The Challenge: Three patients have just arrived in the ER simultaneously. You are the doctor on call. Your job is to perform a rapid initial assessment, decide who needs immediate attention (triage), and develop a preliminary diagnostic plan for the most critical patient.

Step 1: Create the Patient Files

Prepare three index cards (or a digital slide for each) with the following patient information. Do not read the "Underlying Condition" yet.

• Patient A: 68-year-old male, clutching his chest. Complains of crushing central chest pain that radiates to his left arm. He is sweaty, pale, and short of breath.
  • Vitals: BP 90/60, HR 110 bpm, O2 Sat 92%.
  • Underlying Condition (for later review): Acute Myocardial Infarction (Heart Attack)
• Patient B: 19-year-old female, brought in by a friend after being "not herself" for the past hour. She is confused, has a severe headache, and a stiff neck. She finds the room lights painful.
  • Vitals: BP 130/85, HR 95 bpm, Temp 102.5°F (39.2°C).
  • Underlying Condition (for later review): Bacterial Meningitis
• Patient C: 45-year-old male, limping and holding his ankle. He states he fell while playing basketball. His ankle is visibly swollen and bruised, and he cannot put weight on it. He is alert and in pain, but otherwise stable.
  • Vitals: BP 125/80, HR 85 bpm, O2 Sat 99%.
  • Underlying Condition (for later review): Severe Ankle Fracture

Step 2: Triage (5 minutes)

Set a 5-minute timer. Review the three patient files. On the whiteboard, rank them from 1 (most critical) to 3 (least critical). Be prepared to defend your choice using the ABCDE framework.

(Guidance: Patient A's circulation/breathing is compromised. Patient B's disability/neurological status is severely compromised. Patient C has a painful but not life-threatening injury. A and B are top priority.)

Step 3: The Deep Dive - Differential Diagnosis (15-20 minutes)

Choose the patient you ranked as #1. On the whiteboard, create two columns: "Key Symptoms" and "Possible Causes (Differential Diagnosis)."

• List all the key symptoms and vital signs from the patient file.
• Brainstorm at least 3-4 possible biological reasons for this presentation. For example, for Patient A, you might list: Heart Attack, Aortic Dissection, Pulmonary Embolism, Severe Acid Reflux.
• Use the internet (Merck Manual is excellent for this) to quickly look up the classic signs of your suspected conditions to see which one fits best. This simulates what doctors do in practice.

Step 4: Formulate a Plan (10 minutes)

Based on your most likely diagnosis, outline the immediate next steps. Think creatively and practically. What would you do in the first 15 minutes?

• Tests: What tests would you order to confirm your diagnosis? (e.g., EKG, blood test for troponins, chest X-ray for Patient A).
• Initial Treatment: What immediate biological interventions would you start? (e.g., Oxygen for low O2 sat, IV line for fluids/meds, aspirin for a suspected heart attack).

4. Assessment & Debrief

Formative Assessment (During the Activity)

The teacher/facilitator should ask probing questions during the activity, such as:

• "What vital sign worries you the most with this patient, and why?"
• "You suspect it's X, but what evidence could point towards Y instead?"
• "Why is that test more important to order right now than another one?"

Summative Assessment: The Patient Chart (15 minutes)

For the patient you diagnosed, write up a formal (but simplified) "Patient Chart" in your notebook. This demonstrates your complete thought process. Include the following sections:

• Patient ID: (e.g., Patient A, 68M)
• Presenting Complaint: A one-sentence summary of why they are in the ER.
• Initial Assessment (ABCDE): Briefly state your findings for each letter.
• Working Diagnosis: Your primary suspected diagnosis.
• Differential Diagnoses: 2-3 other possibilities you considered.
• Justification: A short paragraph explaining why you chose your working diagnosis over the others, citing evidence from the vitals and symptoms.
• Action Plan: A numbered list of the top 3-5 immediate tests and treatments you would order.

After completing the chart, review the "Underlying Condition" for each patient and discuss how your diagnostic process aligned with the correct answer.

5. Differentiation and Extension

• For Support: Provide a pre-made list of potential differential diagnoses for each case, so the student's task is to match the condition to the evidence rather than generating it from scratch.
• For a Challenge: Introduce a complication. For example: "As you are examining Patient A, he mentions he is allergic to aspirin. How does this change your initial treatment plan?" Or, "Patient B's friend now tells you the patient has a history of migraines. Does this change your thinking?" This forces adaptability and deeper critical thought.