Medical-Surgical Nursing
Core concepts
Medical-surgical content rewards pattern recognition around fluid and electrolyte balance, acid-base interpretation, perfusion, oxygenation, and perioperative care. Build a mental map for each major system: cardiac (angina versus infarction, heart failure, arrhythmia), respiratory (asthma, COPD, pneumonia, pulmonary embolism), renal (acute kidney injury, chronic kidney disease), endocrine (diabetes, thyroid, adrenal), gastrointestinal, and neurological conditions.
Traps to expect
- Early versus late signs: restlessness and tachycardia precede hypotension in shock; confusion may be the first sign of hypoxia or hypoglycaemia in older adults.
- Opposing actions: potassium-sparing diuretics versus loop diuretics; beta-blockers in asthma; NSAIDs in renal impairment.
- Positioning: semi-Fowler's or high-Fowler's for dyspnoea and heart failure; flat or supine only when specifically indicated.
- Lab interpretation: know normal ranges for potassium, sodium, creatinine, and ABGs, and recognise that compensation changes the expected value on the opposite side of the acid-base equation.
Worked example
A postoperative patient becomes tachycardic, restless, and hypotensive with a falling urine output. Interpret this as early hypovolaemic shock: the compensatory tachycardia and restlessness come first. The correct first action is to assess and escalate (vital signs, oxygen, notify the team, prepare fluids), not to administer an analgesic.
Study approach
For every condition, know the priority assessment, the priority intervention, and the complication that kills fastest.