Updated for 2026
NCLEX-RN medical-surgical nursing: systems review and clinical judgment
Medical-surgical nursing is the largest content area on the NCLEX-RN, integrating cardiovascular, respiratory, renal, neurological, GI, endocrine, musculoskeletal, and oncology nursing. NCLEX tests clinical judgment: recognising deterioration, prioritising interventions, and responding to acute changes.
Educational purpose: This content is for exam preparation and professional development only. It is not intended for clinical decision-making. Always follow current guidelines, institutional policies, and scope of practice.
Cardiovascular nursing — heart failure, MI, and dysrhythmias
Heart failure: Differentiate left-sided (pulmonary congestion: dyspnoea, orthopnea, crackles, S3 gallop) from right-sided (systemic congestion: JVD, peripheral oedema, hepatomegaly). Nursing priorities: fluid restriction, daily weights (1 kg = 1 L fluid), sodium restriction (<2 g/day), diuretic monitoring, and avoiding fluid boluses. BNP >100 pg/mL supports heart failure diagnosis. ACEI/ARB and beta-blockers reduce mortality in HFrEF.
Acute MI (STEMI): Time-to-reperfusion is the critical variable (PCI goal <90 min from first medical contact). NCLEX tests recognition of: chest pain radiating to jaw/left arm, diaphoresis, nausea, anterior MI ECG changes (V1-V4 ST elevation), inferior MI (II, III, aVF). MONA mnemonic (Morphine, Oxygen, Nitroglycerin, Aspirin) — current evidence questions routine oxygen unless SpO2 <90%. Aspirin 325 mg immediately; nitrates contraindicated with right ventricular infarct.
Dysrhythmias: Know the six life-threatening rhythms: ventricular fibrillation (defibrillate), pulseless VT (defibrillate), VT with pulse (synchronised cardioversion or amiodarone), complete heart block (pacing), SVT (vagal manoeuvres, adenosine), and asystole (CPR + epinephrine). Atrial fibrillation: rate control vs. rhythm control; anticoagulation for stroke prevention; fall precautions.
Respiratory nursing — COPD, asthma, pneumonia, and respiratory failure
COPD: Chronic obstructive condition; emphysema and chronic bronchitis. Low-flow oxygen is standard — hypoxic drive is a concern in severe CO2 retainers. Target SpO2 88–92% in known COPD with CO2 retention. Pursed-lip breathing, high Fowler's position, bronchodilators (short-acting beta-agonists for rescue, long-acting for maintenance), and smoking cessation are core nursing responsibilities.
Asthma: Reversible airway obstruction. Peak flow monitoring: personal best guides zone system (green >80%, yellow 50–80%, red <50% requires immediate intervention). Status asthmaticus is a medical emergency — silent chest (no wheezing) indicates severe obstruction, not improvement. Heliox, magnesium sulfate, and IV corticosteroids may be required.
Pneumonia: Aspiration risk assessment, positioning (30–45° HOB elevation), incentive spirometry, ambulation, adequate hydration, and antipyretics. Community-acquired vs. hospital-acquired (HAP develops >48 hours post-admission) vs. ventilator-associated (VAP). VAP bundle: HOB elevation, oral care with chlorhexidine, daily sedation holidays, DVT prophylaxis, peptic ulcer prophylaxis.
Respiratory failure: ABG interpretation is a foundational skill. Hypoxaemic failure (Type 1): PaO2 <60 mmHg on room air — the primary problem is oxygenation. Hypercapnic failure (Type 2): PaCO2 >50 mmHg — the primary problem is ventilation. ABG interpretation: pH <7.35 = acidosis, >7.45 = alkalosis. If pH and PaCO2 move in opposite directions → respiratory. If pH and HCO3 move in the same direction → metabolic.
Neurological nursing — stroke, increased ICP, and seizures
Stroke (CVA): FAST acronym (Face droop, Arm weakness, Speech difficulty, Time to call 911) for community recognition. In hospital: CT scan first to rule out haemorrhage before tPA. tPA window: 3–4.5 hours from symptom onset; contraindicated with haemorrhage, recent surgery, anticoagulation, uncontrolled hypertension. Ischaemic stroke: keep BP below 185/110 mmHg if giving tPA. Post-stroke: dysphagia screening before oral intake (thickened liquids if needed), fall prevention, DVT prophylaxis.
Increased ICP: Cushing's triad (hypertension, bradycardia, irregular respirations) is a late sign of critically elevated ICP — imminent herniation. Early signs: headache, nausea, vomiting, altered level of consciousness, pupillary changes. Nursing: HOB 30°, head midline, avoid hip flexion (>90°), avoid clustering of stimulating activities, hyperosmolar therapy (mannitol), avoid hypotension and hypoxia (both worsen cerebral oedema).
Seizures: During: protect from injury (pad rails, do not restrain, do not put anything in mouth), position on side, time the seizure, administer O2. Post-ictal: maintain airway, assess neuro status, document characteristics (type, duration, onset, post-ictal period). Status epilepticus (>5 min or two seizures without recovery) requires IV benzodiazepines (lorazepam first-line) followed by phenytoin or levetiracetam.
Endocrine nursing — diabetes, DKA, and thyroid emergencies
DKA (Diabetic Ketoacidosis): Type 1 DM predominantly. Classic presentation: blood glucose >250 mg/dL, pH <7.3, bicarbonate <15 mEq/L, ketones in urine/blood, Kussmaul respirations (deep and rapid), fruity breath. Management sequence: IV normal saline (fluid resuscitation first), then insulin infusion, then potassium replacement (start potassium before insulin if K+ <3.5 — insulin drives K+ into cells). Monitor hourly glucose, electrolytes q2–4h, and watch for hypoglycemia during treatment.
HHNS/HHS (Hyperosmolar Hyperglycemic State): Type 2 DM, usually older adults. Extreme hyperglycemia (>600 mg/dL), hyperosmolarity, severe dehydration, no significant ketosis, altered mental status. Mortality higher than DKA. Slow fluid replacement over 24–48 hours to prevent cerebral oedema. Insulin after initial fluids.
Thyroid storm: Life-threatening thyrotoxicosis with fever (>104°F/40°C), tachycardia, hypertension, agitation, delirium. Triggered by surgery, infection, trauma, or iodine exposure. Treatment: propylthiouracil (PTU) or methimazole, iodine (after antithyroid drug), beta-blockers, corticosteroids, fever management. Nursing: temperature management, cardiac monitoring, IV access.
Frequently asked questions
- How should I approach NCLEX med-surg prioritization questions?
- Use a systematic framework: (1) Apply ABCs — airway, breathing, circulation concerns always come first. (2) Use Maslow's hierarchy — physiological needs (safety, oxygen, circulation) before psychosocial. (3) Assess before act — for most questions, assessment is the priority action when you don't yet have data. (4) Unstable before stable — a patient with new-onset chest pain takes priority over one with stable chronic back pain. (5) Actual problem before potential — active airway obstruction before risk for aspiration. NCLEX questions often test whether you can distinguish the truly urgent from the merely important.
- What are the most critical assessment findings the NCLEX expects nurses to recognise?
- High-yield critical findings requiring immediate action include: SpO2 <90% on any patient, new chest pain (especially with ECG changes), Cushing's triad (late sign of elevated ICP), absent bowel sounds post-operative + rigidity (peritonitis), urine output <0.5 mL/kg/hr for 2 hours (oliguria/shock), sudden neurological change (possible stroke or herniation), wound dehiscence or evisceration, post-operative bleeding saturating dressings, and any acute change in mental status in older adults. The NCLEX expects nurses to escalate these findings immediately.
Clinically reviewed by NurseNest Clinical Review Team · Last updated 2026-06-10 · For educational purposes only · Review policy