Medical emergencies
Introduction
Medical emergencies involve sudden, life-threatening alterations in physiological function requiring immediate recognition and intervention. Nurses play a central role in early detection, stabilization, and escalation of care.
On NCLEX, the emphasis is not just on knowing the condition, it is on recognizing deterioration early, prioritizing correctly, and initiating first-line nursing actions before a provider arrives.
This section focuses on high-yield emergencies commonly tested on NCLEX, including shock, sepsis, anaphylaxis, myocardial infarction, and stroke.
Learning objectives
By the end of this section, the learner should be able to:
- Identify early and late signs of medical emergencies
- Prioritize care using airway, breathing, and circulation
- Recognize atypical presentations, especially in older adults
- Initiate appropriate first-line nursing actions
- Interpret critical laboratory values
Shock
Shock is a state of inadequate tissue perfusion leading to cellular hypoxia and organ dysfunction.
Common types
- Hypovolemic: fluid loss (hemorrhage, dehydration)
- Cardiogenic: pump failure
- Distributive: vasodilation (septic, anaphylactic, neurogenic)
- Obstructive: mechanical blockage (PE, tamponade)
/////📷 Image suggestion: “Shock types comparison” — simple 4-panel diagram illustrating hypovolemic (fluid loss), cardiogenic (pump failure), distributive (vasodilation), obstructive (mechanical blockage), since these are frequently confused on NCLEX./////
Early signs
The body compensates before blood pressure drops.
- Tachycardia (earliest cardiovascular sign)
- Restlessness or anxiety
- Cool, clammy skin (hypovolemic/cardiogenic)
- Warm, flushed skin (early septic shock)
- Decreased urine output (<30 mL/hr)
- Narrow pulse pressure
Late signs
- Hypotension
- Altered mental status
- Weak or absent peripheral pulses
- Multi-organ dysfunction
- Elevated lactate (>2 mmol/L)
Nursing Priorities in Shock
- Maintain airway
- Apply oxygen
- Establish large-bore IV access
- Initiate fluid resuscitation (unless cardiogenic)
- Monitor urine output
- Prepare for vasopressors if indicated
- //////Caption: Progression of Shock
- Illustration type: Flowchart
- Illustration note: Illustrate the progression from compensated shock to decompensated shock, highlighting early signs (tachycardia, narrowing pulse pressure, decreased urine output, restlessness) and late signs (hypotension, altered mental status, multi-organ dysfunction).///////
Sepsis
Sepsis results from a dysregulated host response to infection, leading to systemic inflammation and organ dysfunction.
Key indicators
- Fever or hypothermia
- Tachycardia
- Tachypnea
- Hypotension
- Altered mental status
- Elevated lactate
- Decreased urine output
Labs
- Lactate > 2 mmol/L → tissue hypoperfusion
- WBC elevated or decreased
- Increased creatinine
- Elevated procalcitonin (sometimes)
/////📷 Image suggestion: “Sepsis progression timeline” — flowchart showing infection → SIRS/sepsis → septic shock, with key vital sign/lactate thresholds labeled at each stage./////
Sepsis Bundle (Time-Sensitive)
Within the first hour:
- Measure lactate
- Obtain blood cultures (before antibiotics)
- Administer broad-spectrum antibiotics per order
- Initiate IV fluids (30 mL/kg for hypotension or lactate ≥4 mmol/L) per order
- Apply vasopressors if hypotensive despite fluid resuscitation, to maintain MAP ≥65 mmHg, per order
- Apply oxygen as needed
When to Call Rapid Response
- RR < 8 or > 28
- HR < 40 or > 130
- O2 sat < 90% despite oxygen
- Sudden mental status change
- Staff concern
- //////Caption: One-Hour Sepsis Bundle
- Illustration type: Clinical workflow
- Illustration note: Illustrate the recommended sequence of the first-hour sepsis bundle, including lactate measurement, blood cultures before antibiotics, broad-spectrum antibiotics, IV fluid resuscitation, vasopressors if indicated, and oxygen therapy as needed.///////
Anaphylaxis
Anaphylaxis is a rapid, systemic allergic reaction that can cause airway obstruction and circulatory collapse.
Key features
- Airway swelling
- Wheezing or stridor
- Hypotension
- Urticaria
Priority action: Administer IM epinephrine immediately.
////📷 Image suggestion: “Anaphylaxis — epinephrine autoinjector technique” — diagram showing correct IM injection site (anterolateral thigh) and technique, since timing/site of epinephrine administration is a common NCLEX testing point./////
After Epinephrine
- Maintain airway
- High-flow oxygen
- IV fluids
- Continuous monitoring
- Prepare for repeat dosing if needed
Myocardial infarction
A myocardial infarction occurs when coronary blood flow is blocked, causing myocardial ischemia and necrosis.
Classic symptoms
- Chest pain or pressure
- Radiation to arm or jaw
- Diaphoresis
- Nausea
Atypical symptoms (older adults, women)
- Fatigue
- Dyspnea
- Epigastric discomfort
- Dizziness
Key Diagnostics
- Elevated troponin
- ECG changes (ST elevation or depression)
- New arrhythmias
Immediate Nursing Actions
- Oxygen if hypoxic
- Cardiac monitor
- IV access
- Administer aspirin (if not contraindicated)
- Prepare for reperfusion (PCI)
- //////Caption: Classic vs. Atypical Myocardial Infarction Presentation
- Illustration type: Comparison table
- Illustration note: Compare classic myocardial infarction symptoms with atypical presentations commonly seen in older adults and women, emphasizing that absence of chest pain does not exclude myocardial infarction.///////
Stroke
Stroke is a neurological emergency caused by interrupted cerebral blood flow.
FAST recognition
- Facial droop
- Arm weakness
- Speech difficulty
- Time to call emergency response
Additional warning signs
- Sudden severe headache
- Vision loss
- Loss of coordination
- Sudden confusion
- //////Caption: FAST Recognition of Stroke
- Illustration type: Infographic
- Illustration note: Illustrate the FAST assessment (Face drooping, Arm weakness, Speech difficulty, Time to call emergency response) with simple visual cues to reinforce rapid stroke recognition OR…
- Illustration note 2: a labeled diagram showing Face droop, Arm weakness, Speech difficulty, Time to call, a widely used, visually simple mnemonic graphic that reinforces rapid recognition.///////
Putting it together: emergency prioritization
ABC prioritization framework
- Airway threats come first
- Breathing and oxygenation second
- Circulation and perfusion third
- Neurological status reflects severity
NGN Clinical Judgment Model
- Recognize cues
- Analyze cues
- Prioritize hypotheses
- Generate solutions
- Take action
- Evaluate outcomes
Delegation in emergencies
UAP can:
- Obtain vital signs
- Report abnormal findings immediately
- Assist with oxygen therapy, as delegated
- Assist with CPR
RN must:
- Perform rapid assessment
- Prioritize and interpret clinical findings
- Administer emergency medications
- Activate the Rapid Response Team
- Evaluate the client’s response
Clinical vignette 1
A client with pneumonia becomes tachycardic, confused, and hypotensive with decreasing urine output.
Nursing action: Rapidly escalate care, administer oxygen, establish IV access, obtain blood cultures as ordered, administer prescribed broad-spectrum antibiotics, and begin fluid resuscitation per protocol.
Rationale: Tachycardia, hypotension, confusion, and decreasing urine output are concerning for septic shock, a time-sensitive medical emergency requiring immediate intervention.
Clinical vignette 2
A client receiving IV antibiotics develops wheezing, facial swelling, and hypotension.
Nursing action: Administer IM epinephrine immediately, maintain the airway, provide high-flow oxygen, initiate IV fluids, and notify the provider.
Rationale: Wheezing, facial swelling, and hypotension indicate anaphylaxis, requiring immediate epinephrine to prevent airway obstruction and circulatory collapse.