What are You Looking For?

All Topics › Physiological Adaptation

Physiological Adaptation Practice Test

The most clinically complex NCLEX-RN category — covering acute and chronic conditions across every body system. These 25 questions test your ability to recognize deterioration, interpret abnormal findings, and select priority nursing actions in high-acuity scenarios.

11–17%
Third largest category of the NCLEX-RN exam
25 questions ~15 minutes Instant scoring No signup needed

Physiological Adaptation Quiz

Test your NCLEX knowledge with physiological adaptation questions on emergencies, fluids, cardiac, and respiratory conditions. Instant scoring.

26 questions | 90 minutes | 70% to pass

Question 1: A patient presents with crushing substernal chest pain radiating to the left jaw, diaphoresis, and nausea. BP is 94/60, HR 112. The nurse's PRIORITY action is:

  1. Administer oral aspirin 325 mg, apply 12-lead ECG, establish IV access, and notify the provider immediately
  2. Reassure the patient and reposition for comfort
  3. Administer nitroglycerin and discharge if pain resolves
  4. Obtain a chest X-ray and wait for results before notifying the provider

Answer: A — Crushing chest pain + radiation + diaphoresis + hemodynamic instability = acute MI until proven otherwise. The MONA mnemonic guides initial care: Morphine, Oxygen, Nitrates, Aspirin. 12-lead ECG within 10 minutes is the standard. Do not delay notification.

Question 2: A patient with heart failure has crackles bilaterally, JVD, 3+ pitting edema, and an SpO2 of 89%. BP is 168/96. The nurse anticipates which intervention as the PRIORITY?

  1. Aggressive IV fluid resuscitation to improve cardiac output
  2. Administer furosemide IV, elevate HOB to 90 degrees, and apply supplemental oxygen
  3. Restrict all fluid and sodium permanently
  4. Administer metoprolol IV to slow the heart rate

Answer: B — Acute decompensated heart failure causes fluid overload. Priority: diuresis (furosemide), high Fowler's to reduce preload, and oxygen to correct hypoxia. IV fluids worsen the condition. Treat the fluid overload first.

Question 3: A patient on telemetry has a heart rate of 180 bpm. The rhythm shows no identifiable P waves and an irregularly irregular pattern. The nurse recognizes this as:

  1. Normal sinus rhythm with artifact
  2. Ventricular fibrillation requiring defibrillation
  3. Atrial fibrillation — notify the provider and anticipate rate control medications
  4. Third-degree heart block

Answer: C — Atrial fibrillation hallmarks: no distinct P waves, irregularly irregular rhythm, rate 100–180. Risk: thrombus formation and stroke. Priority: rate control (metoprolol, diltiazem), anticoagulation assessment, and provider notification.

Question 4: A patient's BP is 210/118 and they report a sudden severe headache and blurred vision. The nurse should suspect:

  1. Orthostatic hypotension
  2. Hypertensive emergency — place on cardiac monitor, establish IV access, and notify the provider for IV antihypertensive orders
  3. Migraine headache — administer sumatriptan
  4. Normal blood pressure variation

Answer: B — BP >180/120 with end-organ symptoms (headache, visual changes) = hypertensive emergency. Target: reduce MAP by no more than 25% in the first hour using IV agents (nicardipine, labetalol). Too-rapid reduction causes stroke or MI.

Question 5: A patient in septic shock has BP 78/50, HR 132, temperature 39.8°C, and MAP of 45 mmHg. The nurse's FIRST priority intervention is:

  1. Administer broad-spectrum antibiotics and wait for culture results before fluids
  2. Administer 30 mL/kg IV crystalloid bolus and notify the provider for vasopressor orders
  3. Apply cooling blanket and administer acetaminophen
  4. Obtain blood cultures and defer treatment until sensitivity results return

Answer: B — Septic shock = distributive shock from vasodilation. Surviving Sepsis Campaign: 30 mL/kg IV crystalloid within 3 hours, blood cultures before antibiotics, antibiotics within 1 hour, vasopressors (norepinephrine) if MAP <65 after fluids.

Question 6: A patient with COPD presents with worsening dyspnea, pursed-lip breathing, barrel chest, and SpO2 88%. The nurse should administer oxygen at:

  1. 100% via non-rebreather mask
  2. 15 L/min via simple face mask
  3. 1–2 L/min via nasal cannula targeting SpO2 88–92%
  4. No oxygen — it will eliminate their hypoxic drive

Answer: C — COPD patients retain CO2 and rely on hypoxic drive. Target SpO2 88–92% using low-flow O2 (1–2 L NC or Venturi mask). High-flow O2 suppresses hypoxic drive, causing respiratory depression. Never withhold O2 entirely — balance is key.

Question 7: A patient post-op develops sudden pleuritic chest pain, dyspnea, tachycardia (HR 118), and SpO2 90%. The nurse suspects pulmonary embolism. The PRIORITY nursing action is:

  1. Place the patient flat and administer oral aspirin
  2. Apply oxygen, establish IV access, notify the provider, and prepare for CT pulmonary angiography and anticoagulation
  3. Administer albuterol nebulization for bronchospasm
  4. Reassure the patient and increase fluid intake

Answer: B — Sudden pleuritic pain + tachycardia + hypoxia post-op = PE until proven otherwise. Priority: O2, IV access, notify provider, prepare for CTPA (gold standard diagnostic), and anticipate heparin anticoagulation. Classic triad: dyspnea, tachycardia, pleuritic pain.

Question 8: A patient with asthma is in the ED. Their peak flow is 35% of predicted, they cannot complete sentences, and accessory muscle use is noted. The nurse recognizes this as:

  1. Mild intermittent asthma — administer SABA and discharge
  2. Moderate persistent asthma — schedule pulmonology follow-up
  3. Severe acute asthma exacerbation — administer SABA, systemic corticosteroids, supplemental O2, and prepare for possible intubation
  4. Status asthmaticus resolving — reassess in 2 hours

Answer: C — Peak flow <40% + inability to speak in full sentences + accessory muscle use = severe exacerbation. Priority: albuterol (SABA) back-to-back nebulizations, IV/oral steroids, O2, Mg sulfate if refractory. Prepare for intubation if no improvement.

Question 9: A patient develops sudden respiratory distress after a central line insertion. Breath sounds are absent on the right, trachea is deviated to the left, BP 82/54, HR 128. The nurse suspects:

  1. Pulmonary embolism
  2. Tension pneumothorax — call a rapid response and prepare for emergency needle decompression
  3. Right-sided pneumonia
  4. Hemothorax requiring blood transfusion

Answer: B — Absent unilateral breath sounds + tracheal deviation AWAY from affected side + hemodynamic collapse = tension pneumothorax. This is a life-threatening emergency. Needle decompression at 2nd intercostal space, midclavicular line is required immediately.

Question 10: A patient has the following ABG: pH 7.30, PaCO2 28 mmHg, HCO3 13 mEq/L. They are a known diabetic with BS of 540 mg/dL and fruity breath. The nurse identifies this as:

  1. Respiratory alkalosis
  2. Compensated metabolic alkalosis
  3. Metabolic acidosis with respiratory compensation — consistent with DKA
  4. Respiratory acidosis with metabolic compensation

Answer: C — pH 7.30 (acidotic) + low HCO3 13 (metabolic cause) + low PaCO2 (respiratory compensation/Kussmaul breathing) = metabolic acidosis. BS 540 + fruity breath = DKA. Treatment: IV fluids, insulin drip, potassium replacement.

Question 11: A patient with hyponatremia (Na 118 mEq/L) is ordered 3% hypertonic saline. The nurse should monitor for which PRIORITY complication during infusion?

  1. Hyperglycemia
  2. Osmotic demyelination syndrome from correcting sodium too rapidly — correct no faster than 8–10 mEq/L per 24 hours
  3. Metabolic alkalosis
  4. Fluid volume deficit

Answer: B — Correcting severe hyponatremia too rapidly causes osmotic demyelination syndrome (central pontine myelinolysis) — permanent neurological damage. Sodium must be raised slowly: no more than 8–10 mEq/L/24 hours. Monitor sodium levels every 2–4 hours during infusion.

Question 12: A patient has a potassium of 6.8 mEq/L with peaked T waves and a widened QRS on ECG. In what ORDER should the nurse anticipate these interventions?

  1. Furosemide → insulin/glucose → sodium polystyrene → calcium gluconate
  2. Calcium gluconate → insulin with dextrose → sodium bicarbonate → kayexalate or dialysis
  3. Kayexalate → calcium gluconate → furosemide → insulin
  4. No treatment needed until K+ exceeds 7.5 mEq/L

Answer: B — With cardiac changes: (1) Calcium gluconate FIRST — stabilizes the heart membrane within minutes; (2) Insulin + glucose — shifts K+ into cells; (3) Sodium bicarbonate — shifts K+ intracellularly; (4) Kayexalate/dialysis — removes K+ from body.

Question 13: A patient with SIADH has a serum sodium of 122 mEq/L and serum osmolality of 255 mOsm/kg. The nurse anticipates which treatment?

  1. Administer 3 L IV normal saline to replace sodium
  2. Fluid restriction to 800–1,000 mL/day and identify/treat the underlying cause
  3. Administer furosemide to increase urine output
  4. Encourage unlimited oral fluid intake

Answer: B — SIADH = excessive ADH → water retention → dilutional hyponatremia. Treatment: fluid restriction (800–1,000 mL/day) is the cornerstone. In severe cases, hypertonic saline or vasopressin antagonists (tolvaptan) may be used. Never fluid-load a SIADH patient.

Question 14: A type 1 diabetic patient presents with BS 620, pH 7.22, HCO3 10, fruity breath, polyuria, and Kussmaul respirations. BP 98/62. What is the nurse's PRIORITY first action?

  1. Administer insulin bolus IV immediately before anything else
  2. Establish IV access and begin aggressive normal saline fluid resuscitation, then notify the provider for insulin drip orders
  3. Administer sodium bicarbonate to correct acidosis
  4. Give orange juice to raise blood sugar

Answer: B — In DKA: fluid resuscitation with NS FIRST corrects hypovolemia and dilutes glucose. Insulin without fluids can cause cardiovascular collapse. Potassium must be ≥3.5 before starting insulin (insulin shifts K+ into cells, worsening hypokalemia).

Question 15: A patient with type 2 diabetes on oral medications presents with BS 890, serum osmolality 345 mOsm/kg, extreme lethargy, and NO ketones in urine. The nurse recognizes this as:

  1. Diabetic ketoacidosis — administer insulin drip
  2. Hyperosmolar hyperglycemic state (HHS) — priority is aggressive IV fluid replacement
  3. Hypoglycemia — administer D50
  4. Normal glucose variation in type 2 diabetes

Answer: B — HHS vs DKA: HHS has higher glucose (>600), hyperosmolarity (>320), NO significant ketones, and occurs in type 2 DM. DKA has ketones and lower glucose. Both require fluids first, but HHS has higher fluid deficits (8–10 L) and slower correction.

Question 16: A patient presents with exophthalmos, HR 142, temperature 40.1°C, BP 168/88, and extreme agitation following thyroid surgery. The nurse suspects:

  1. Hypoglycemia
  2. Myxedema coma
  3. Thyroid storm — notify the provider and prepare to administer PTU, beta-blockers, steroids, and iodine
  4. Addisonian crisis

Answer: C — Thyroid storm = life-threatening thyroid hormone surge. Classic findings: hyperthermia, tachycardia, hypertension, agitation, exophthalmos. Treatment sequence: PTU (blocks new hormone synthesis) → iodine (1 hour later, blocks release) → beta-blocker → steroids → cooling measures.

Question 17: A patient on long-term corticosteroids is admitted for surgery. Post-op they develop BP 74/48, HR 118, confusion, and hypoglycemia despite dextrose. Serum sodium is low and potassium is elevated. The nurse suspects:

  1. Cushing's syndrome flare
  2. Septic shock
  3. Addisonian crisis — administer IV hydrocortisone immediately
  4. Cardiogenic shock

Answer: C — Addisonian crisis (acute adrenal insufficiency): hypotension refractory to fluids, hyponatremia, hyperkalemia, hypoglycemia. Common trigger: abrupt steroid cessation or surgical stress. Treatment: IV hydrocortisone 100 mg STAT, IV fluids, glucose replacement.

Question 18: A patient is found unresponsive. Assessment reveals unequal pupils, decerebrate posturing, BP 188/102, HR 52, and respirations 8/min and irregular. The nurse recognizes this triad as:

  1. Signs of hypoglycemia
  2. Cushing's triad — indicative of severely increased intracranial pressure requiring immediate intervention
  3. Signs of opioid overdose — administer naloxone
  4. Neurogenic shock

Answer: B — Cushing's triad (increased ICP): hypertension with widened pulse pressure, bradycardia, and irregular respirations. This is a late, ominous sign of brainstem herniation. Priority: notify provider, prepare for intubation, HOB 30 degrees, and anticipate mannitol or hypertonic saline.

Question 19: A patient with a T4 spinal cord injury develops sudden BP 210/118, pounding headache, flushing above the injury level, and bradycardia. The nurse's FIRST action is:

  1. Administer antihypertensives and continue assessment
  2. Identify and remove the triggering stimulus — check for bladder distension or fecal impaction — and sit the patient upright immediately
  3. Lay the patient flat to increase cerebral perfusion
  4. Administer epinephrine for the bradycardia

Answer: B — Autonomic dysreflexia: life-threatening reflex response in spinal cord injury at T6 or above. Trigger (usually bladder or bowel) causes massive sympathetic surge. Priority: sit upright (reduces BP), identify and eliminate the trigger (straight catheterize or disimpact), then antihypertensives if needed.

Question 20: A patient has a witnessed tonic-clonic seizure in the hospital room. The nurse's PRIORITY actions during the seizure are:

  1. Restrain the patient and insert a tongue blade to prevent biting
  2. Turn patient to side, protect head, do NOT restrain, do NOT insert anything into mouth, note seizure duration
  3. Give oral lorazepam immediately
  4. Perform a sternal rub to assess responsiveness

Answer: B — During a seizure: protect the patient from injury (pad rails, cushion head), turn to lateral position to prevent aspiration, never restrain or insert objects into mouth (risk of broken teeth/airway injury). Time the seizure — >5 minutes = status epilepticus requiring IV benzodiazepines.

Question 21: A patient with bacterial meningitis has a temperature of 39.9°C, severe headache, nuchal rigidity, and a petechial rash. The nurse's PRIORITY action is:

  1. Isolate the patient and wait for CSF results before starting antibiotics
  2. Institute droplet precautions, obtain blood cultures, and administer IV antibiotics and dexamethasone within 1 hour — do not delay for LP results
  3. Administer acetaminophen and reassess in 4 hours
  4. Perform a lumbar puncture before any other interventions

Answer: B — Bacterial meningitis is a medical emergency. Mortality increases significantly with antibiotic delay. Priority: droplet isolation, blood cultures, then IV antibiotics + dexamethasone immediately. LP should not delay antibiotics. Petechial rash suggests meningococcal meningitis.

Question 22: A patient with Guillain-Barré syndrome reports ascending weakness now involving the chest. Respiratory rate is 28/min and shallow. The nurse's MOST critical assessment is:

  1. Deep tendon reflexes
  2. Urine output
  3. Negative inspiratory force (NIF) and vital capacity — prepare for intubation if NIF worse than -20 cmH2O
  4. Level of consciousness

Answer: C — GBS can cause respiratory paralysis. The most critical monitoring parameter is respiratory muscle function: NIF and vital capacity. NIF worse than -20 cmH2O or VC <1 L indicates impending respiratory failure requiring mechanical ventilation. This can occur rapidly.

Question 23: A patient with cirrhosis presents with confusion, asterixis (flapping tremor), and jaundice. Ammonia level is 142 mcmol/L. The nurse anticipates which intervention?

  1. Administer neomycin IV to treat the infection causing confusion
  2. Administer lactulose orally or via enema to reduce ammonia production in the gut
  3. Restrict all protein intake permanently
  4. Administer albumin infusion to correct the asterixis

Answer: B — Hepatic encephalopathy is caused by ammonia accumulation from gut bacteria. Lactulose traps ammonia in the gut as ammonium and promotes excretion. Target: 2–3 soft stools/day. Rifaximin (antibiotic) may also be used. Protein restriction is no longer recommended long-term.

Question 24: A patient with acute kidney injury has urine output of 15 mL/hr for the past 4 hours, BUN 58, creatinine 4.2, and potassium 6.1. The nurse's PRIORITY concern is:

  1. Fluid volume excess from over-hydration
  2. Hyperkalemia-induced cardiac arrhythmias — place on cardiac monitor and notify provider immediately
  3. Metabolic alkalosis from bicarbonate retention
  4. Hyponatremia from dilution

Answer: B — AKI impairs potassium excretion. A K+ of 6.1 with oliguria is a cardiac emergency. Place on telemetry, notify provider, and prepare for calcium gluconate, insulin/glucose, and possible dialysis. Peaked T waves signal immediate danger.

Question 25: A patient with 40% total body surface area burns is in the emergent phase (first 24 hours). Which IV fluid order is CORRECT based on the Parkland formula?

  1. Colloids only — albumin 5% at 250 mL/hr
  2. 4 mL × weight (kg) × %TBSA burned of lactated Ringer's — half in first 8 hours from time of burn, half over next 16 hours
  3. Normal saline at a keep-vein-open rate
  4. Dextrose 5% water at a maintenance rate

Answer: B — The Parkland formula guides burn fluid resuscitation: 4 mL × kg × %TBSA of LR. Half is given in the FIRST 8 hours from time of injury (not admission). Adequacy is assessed by urine output: target 0.5–1 mL/kg/hr in adults.

Question 26: A patient with DIC (disseminated intravascular coagulation) is simultaneously bleeding from IV sites and developing peripheral clots. Lab results show low platelets, low fibrinogen, elevated PT/aPTT, and elevated D-dimer. The nurse's PRIORITY intervention is:

  1. Administer heparin to treat the clotting
  2. Identify and treat the underlying cause — administer fresh frozen plasma, cryoprecipitate, and platelets as ordered
  3. Administer warfarin to prevent further clot formation
  4. Apply direct pressure only and avoid all blood products

Answer: B — DIC = paradoxical simultaneous clotting and bleeding due to depletion of clotting factors. Treatment: address the underlying cause (sepsis, trauma, obstetric emergency) and replace consumed clotting factors with FFP, cryoprecipitate (fibrinogen), and platelets. Heparin is controversial and rarely used.

What your score means

85% or above — Strong clinical reasoning

Excellent performance on the most scenario-heavy category on the exam. You can recognize deterioration across body systems and select appropriate priority actions. Review any missed questions, then move on.

70–84% — Close, but sharpen your system-by-system knowledge.

You’re likely missing questions on specific body systems — most often cardiac, respiratory, or fluid/electrolyte imbalances. Use the body-systems reference below to identify your weakest areas, then retake.

Below 70% — Prioritise this section.

Physiological Adaptation is 11–17% of the exam and tests the deepest clinical knowledge. Work through the body-systems cheat sheets below systematically, then revisit our NCLEX-RN Study Guide before retaking.

Premium prep
NCLEX-RN Ultimate Pack — 3500+ questions, case studies, cheat sheets & full study system
$200+ NCLEX Prep Bundle — Yours for Just $39. Everything you need to pass in one place.

What’s covered in Physiological Adaptation

This category tests your ability to manage patients experiencing acute, subacute, and chronic physical health conditions. Questions are almost always scenario-based — you’ll be given a set of assessment findings and asked to identify what’s happening, what’s most urgent, or what nursing action comes next.

Cardiovascular Conditions

MI, heart failure, dysrhythmias, hypertensive crisis, shock types, peripheral vascular disease.

~5 questions

Respiratory Conditions

COPD, asthma, pneumonia, pulmonary embolism, ARDS, pneumothorax, oxygen delivery systems.

~5 questions

Fluid, Electrolyte & Acid-Base

Hypo/hypernatremia, hypo/hyperkalemia, DKA, SIADH, fluid volume deficit/excess, ABG interpretation.

~5 questions

Endocrine & Metabolic

DKA vs. HHS, hypoglycemia, thyroid crisis (thyroid storm), Addisonian crisis, Cushing’s syndrome.

~4 questions

Neurological Conditions

Stroke (ischemic vs. hemorrhagic), increased ICP, seizures, spinal cord injury, Guillain-Barré, meningitis.

~4 questions

GI, Renal & Other Systems

GI bleeding, liver failure, acute kidney injury, chronic kidney disease, burns, sepsis, DIC.

~2 questions

All NCLEX-RN practice topics

Scored well here? Keep the momentum going. Each topic has 25 focused questions with full rationales.

Safe & Effective Care
25 questions — 21–33%
Pharmacology & Parenteral
25 questions — 12–18%
You are here
Physiological Adaptation
25 questions — 11–17%
Reduction of Risk Potential
25 questions — 9–15%
Health Promotion & Maintenance
25 questions — 6–12%
Psychosocial Integrity
25 questions — 6–12%
Mental Health Nursing
25 questions
Maternal & Newborn
25 questions
Pediatric Nursing
25 questions
Lab Values & Diagnostics
25 questions
Full 75-Question Test
All categories · Exam conditions

How to master Physiological Adaptation

Study by body system, not by individual disease

Group conditions by system: cardiovascular, respiratory, neurological, endocrine, renal, GI. Within each system, learn the pattern — what does deterioration look like? What are the priority nursing actions for this system? You’ll find that many conditions within a system share the same nursing framework, even when the pathophysiology differs.

Learn the “early vs. late” signs of deterioration for each system

The NCLEX loves to test whether you can recognize a patient who is about to deteriorate vs. one who already has. Early signs of shock (restlessness, slight tachycardia, cool peripheries) are very different from late signs (hypotension, altered LOC, absent pulses). Knowing both — and knowing that early intervention is the correct answer — is the difference between passing and failing these questions.

Master the fluid and electrolyte imbalances table

Electrolyte questions appear in every Physiological Adaptation set. Know the signs of hypo and hyper states for sodium, potassium, calcium, and magnesium. Know which conditions cause each imbalance (e.g., loop diuretics → hypokalemia, renal failure → hyperkalemia) and what the nursing priority is. These questions are highly predictable and very learnable with a structured table.

Distinguish between conditions with similar presentations

Several high-yield pairs look similar but require different interventions: DKA vs. HHS, ischemic stroke vs. hemorrhagic stroke, tension pneumothorax vs. hemothorax, hypovolemic shock vs. cardiogenic shock. Build a comparison table for each pair: how do the presentations differ, what does each require, and what would be contraindicated in one but indicated in the other?

Retake until you score 85%+ consistently

Physiological Adaptation questions are the hardest on the NCLEX because they require the most integrated clinical reasoning. Each wrong answer here points to a specific system or condition gap. Treat every missed question as a mini-study session — understand exactly why the correct answer was correct and why your chosen answer was wrong.

Quick Reference by Body System

Each panel below covers the conditions most frequently tested within that system — with signs and symptoms alongside the priority nursing actions. This is the fastest way to identify exactly which system is costing you points.

Cardiovascular System
5 conditions
Condition
Signs & Symptoms
Priority Nursing Actions
Acute MI URGENT
  • Crushing chest pain (may radiate to jaw/arm)
  • Diaphoresis, nausea, dyspnea
  • Women: atypical (fatigue, epigastric pain)
  • MONA: Morphine, O₂, Nitro, Aspirin
  • 12-lead ECG immediately
  • Position: semi-Fowler’s; IV access; prepare for PCI
Heart Failure (Left-sided)
  • Pulmonary congestion: crackles, dyspnea, orthopnea
  • Pink frothy sputum (severe)
  • S3 gallop, fatigue
  • High Fowler’s position; O₂
  • Diuretics (furosemide), daily weight
  • Fluid restriction; monitor I&O
Heart Failure (Right-sided)
  • Peripheral edema (dependent)
  • JVD, ascites, hepatomegaly
  • Weight gain (>2 lb/day = notify provider)
  • Daily weights (same time, same scale)
  • Low-sodium diet; fluid restriction
  • Elevate legs; compression stockings
Hypovolemic Shock URGENT
  • Early: restlessness, ↑HR, cool/clammy skin
  • Late: ↓BP, ↓UO (<30 mL/hr), altered LOC
  • Narrowing pulse pressure
  • Position: supine with legs elevated (modified Trendelenburg)
  • Large-bore IV ×2; rapid fluid resuscitation
  • O₂; identify and stop bleeding source
Hypertensive Crisis URGENT
  • BP >180/120 mmHg
  • Severe headache, visual changes
  • Chest pain, confusion (end-organ damage signs)
  • IV antihypertensive (labetalol, nicardipine)
  • Reduce BP gradually — rapid drop can cause stroke
  • Continuous cardiac monitoring; neuro checks
Respiratory System
5 conditions
Condition
Signs & Symptoms
Priority Nursing Actions
COPD Exacerbation
  • Increased dyspnea, productive cough
  • Barrel chest, pursed-lip breathing
  • ↓SpO₂; accessory muscle use
  • O₂ target: SpO₂ 88–92% (hypoxic drive — avoid high flow O₂)
  • Pursed-lip breathing; bronchodilators
  • High Fowler’s; tripod position
Pulmonary Embolism URGENT
  • Sudden onset dyspnea, pleuritic chest pain
  • Tachycardia, tachypnea, hemoptysis
  • ↓SpO₂ despite O₂
  • High-flow O₂; high Fowler’s
  • IV access; anticoagulation (heparin)
  • Monitor for deterioration; prepare for thrombolytics/embolectomy
Tension Pneumothorax URGENT
  • Absent breath sounds (affected side)
  • Tracheal deviation toward opposite side
  • ↓BP, JVD, hypoxia — rapidly fatal
  • Immediate needle decompression (2nd ICS, MCL)
  • High-flow O₂; emergency chest tube
  • This is a medical emergency — act immediately
Asthma (Acute)
  • Wheezing, dyspnea, chest tightness
  • Accessory muscle use, prolonged expiration
  • Silent chest = impending respiratory failure
  • Short-acting β₂ agonist (albuterol) first
  • High Fowler’s; O₂ to maintain SpO₂ >95%
  • IV corticosteroids for severe attacks
ARDS
  • Refractory hypoxemia despite high-flow O₂
  • Bilateral infiltrates on CXR (“white-out”)
  • No evidence of heart failure (non-cardiogenic)
  • Mechanical ventilation with PEEP
  • Prone positioning to improve oxygenation
  • Treat underlying cause; conservative fluid management
Fluid, Electrolyte & Acid-Base
6 imbalances
Imbalance
Key Signs & Labs
Priority Nursing Actions
Hypokalemia (K⁺ <3.5)
  • Muscle weakness, leg cramps, fatigue
  • Dysrhythmias, flat T-waves on ECG
  • Hypoactive bowel sounds, constipation
  • Oral K⁺ replacement with food
  • IV KCl: never IV push — max 10 mEq/hr peripheral
  • Monitor ECG; assess for digoxin toxicity (↑risk)
Hyperkalemia (K⁺ >5.0) URGENT
  • Peaked T-waves, widened QRS
  • Muscle weakness, paresthesias
  • Bradycardia → cardiac arrest
  • Cardiac monitor; restrict dietary K⁺
  • IV calcium gluconate (cardiac protection, first)
  • Insulin + dextrose; sodium bicarbonate; Kayexalate
Hyponatremia (Na⁺ <136)
  • Headache, confusion, seizures (severe)
  • Nausea, muscle cramps
  • SIADH most common cause in hospitalized pts
  • Fluid restriction (if SIADH)
  • Seizure precautions; fall prevention
  • Correct Na⁺ slowly — rapid correction → osmotic demyelination
Hypocalcemia (Ca²⁺ <8.5)
  • Trousseau’s sign (carpopedal spasm with BP cuff)
  • Chvostek’s sign (facial twitch)
  • Tetany, laryngospasm, seizures
  • IV calcium gluconate (not calcium chloride — causes tissue necrosis peripherally)
  • Seizure precautions
  • Teach: increase dietary calcium + Vit D
DKA URGENT
  • Kussmaul respirations, fruity breath
  • Polyuria, polydipsia, nausea
  • BG >300 mg/dL; ketones in urine; pH <7.35
  • IV normal saline first (volume)
  • Regular insulin infusion (after K⁺ confirmed >3.5)
  • Monitor K⁺ closely — insulin drives K⁺ into cells
SIADH
  • Dilutional hyponatremia
  • Concentrated urine (↑urine osmolality)
  • Confusion, headache, seizures
  • Fluid restriction (primary treatment)
  • Daily weights; I&O; neuro checks
  • Demeclocycline or vasopressin antagonist (severe)
Neurological System
4 conditions
Condition
Signs & Symptoms
Priority Nursing Actions
Ischemic Stroke URGENT
  • Sudden unilateral weakness/facial droop
  • Slurred speech, vision changes
  • FAST: Face, Arm, Speech, Time
  • tPA within 3–4.5 hrs if eligible (no hemorrhage)
  • NPO until swallow screen; HOB 30°
  • No antihypertensives unless BP >220/120 (allow permissive HTN)
Increased ICP URGENT
  • Cushings Triad: ↑BP, bradycardia, irregular respirations
  • Pupil changes (blown pupil = herniation)
  • Deteriorating LOC, headache, projectile vomiting
  • HOB 30°; neutral head position
  • Mannitol (osmotic diuretic); hyperventilation
  • Avoid: clustering care, Valsalva, hip flexion >90°
Seizures (Active) URGENT
  • Tonic-clonic movements, loss of consciousness
  • Apnea during seizure; cyanosis
  • Postictal confusion after
  • Protect from injury; do NOT restrain or put anything in mouth
  • Turn to side (after tonic phase); O₂
  • Note duration; IV lorazepam or diazepam if prolonged
Spinal Cord Injury
  • Motor/sensory loss below injury level
  • Neurogenic shock: ↓BP, bradycardia, warm skin
  • C3-C5 injury: respiratory compromise
  • Immobilize immediately; log-roll technique
  • Monitor respiratory function (C4 and above = ventilator risk)
  • Autonomic dysreflexia: sit upright, find & remove stimulus
Full test
Take the Full 75-Question NCLEX-RN Practice Test
All client needs categories. Exam conditions. Instant results with full score breakdown.

Frequently asked questions

How much of the NCLEX-RN is Physiological Adaptation?
Physiological Adaptation accounts for 11–17% of the NCLEX-RN. With a minimum 75-question exam, expect roughly 8–13 questions from this category. It is consistently the most clinically complex section, featuring high-acuity scenario-based questions that require integrated reasoning across body systems.
What body systems are most frequently tested?
Cardiovascular and respiratory conditions appear on nearly every exam. Fluid and electrolyte imbalances — especially hypokalemia, hyperkalemia, DKA, and SIADH — are also heavily tested. Neurological emergencies (stroke, increased ICP, seizures) appear regularly. Endocrine conditions like DKA vs. HHS and sepsis appear less often but are high-yield when they do appear.
What’s the difference between DKA and HHS?
Both are diabetic emergencies involving hyperglycemia. DKA occurs primarily in Type 1 DM, features ketone production (Kussmaul respirations, fruity breath, pH <7.35), and BG typically 300–600 mg/dL. HHS (Hyperosmolar Hyperglycemic State) occurs in Type 2 DM, has no significant ketoacidosis, presents with extreme hyperglycemia (often >600 mg/dL), severe dehydration, and high serum osmolality. Treatment for both begins with IV fluids, then insulin — but HHS requires more aggressive fluid replacement.
Why is the COPD oxygen rule so important?
Patients with COPD who have chronic CO₂ retention rely on low oxygen levels (hypoxic drive) to stimulate breathing, rather than the normal CO₂ drive. Administering high-flow oxygen can suppress this drive and cause respiratory depression. The target SpO₂ for COPD exacerbations is 88–92% — not the usual 95%+. This appears frequently in NCLEX questions and is one of the most commonly tested respiratory rules.
What’s the most important thing to know about tension pneumothorax?
Tension pneumothorax is immediately life-threatening and requires emergency needle decompression without waiting for imaging. The classic triad is absent breath sounds on the affected side, tracheal deviation toward the opposite side, and cardiovascular collapse (hypotension + JVD). If you see these findings in a question, the correct answer is immediate action — not further assessment.
Can I take this quiz more than once?
Yes, unlimited retakes with no account required. For Physiological Adaptation specifically, we recommend identifying which body system you’re losing points in, reviewing that system’s panel in the cheat sheet above, then retaking. Target 85% or higher consistently before your exam date.

Get your free Physiological Adaptation cheat sheet

Body-system quick-reference covering cardiovascular, respiratory, neurological, fluid/electrolyte imbalances, and endocrine emergencies — all on one printable page.

[Insert MailerLite or ConvertKit email opt-in form here]

[Button text: “Send Me the Free Cheat Sheet”]

Don’t just pass. Krush it.

Get 180+ Physiological Adaptation questions plus the full Ultimate NCLEX-RN Pack — 3500+ NGN-style questions, study guides, cheat sheets, and much more.

Get instant access — $39

Subscribe to our Newsletter

Subscribe to our email newsletter to get the latest posts delivered right to your email.
Pure inspiration, zero spam ✨