AKI, Fluid, Electrolyte and Acid-Base Decisions
Determine kidney-injury mechanism, correct dangerous biochemical disturbance and prescribe fluid or renal support safely.
How to prepare for MRCP(UK) Part 2 Written
Use the official likely question distribution to protect breadth, then practise extracting decisive clinical and visual evidence before selecting one best answer.
Core concepts
Concept 1
Creatinine and urine-output trend, volume state, medicines, urinalysis, obstruction, potassium and acid-base physiology.
Exam cue: Refractory hyperkalaemia, severe acidosis, pulmonary oedema, uraemic complication or rapidly progressive renal disease.
Concept 2
Treat reversible causes, adjust medicines and fluids, monitor response and escalate for renal replacement when indicated.
Exam cue: Use repeat laboratory data, urine studies, imaging and targeted serology according to the suspected mechanism.
Risk pitfalls and guardrails
Giving repeated fluid without reassessing overload, cause and response.
Guardrail: Do not select an option merely because it is true; choose the one that best fits the exact clinical task, urgency and time point.
Selecting an option that is true in isolation but does not best answer the exact clinical task.
Guardrail: Do not interpret a visual pattern without the modality, clinical context and the exact task in the stem.
Memory anchors
What frames AKI, Fluid, Electrolyte and Acid-Base Decisions?
Creatinine and urine-output trend, volume state, medicines, urinalysis, obstruction, potassium and acid-base physiology.
Which aki, fluid, electrolyte and acid-base decisions findings change urgency?
Refractory hyperkalaemia, severe acidosis, pulmonary oedema, uraemic complication or rapidly progressive renal disease.
How should investigations be chosen in aki, fluid, electrolyte and acid-base decisions?
Use repeat laboratory data, urine studies, imaging and targeted serology according to the suspected mechanism.
What guides management in aki, fluid, electrolyte and acid-base decisions?
Treat reversible causes, adjust medicines and fluids, monitor response and escalate for renal replacement when indicated.
What common error should be avoided in aki, fluid, electrolyte and acid-base decisions?
Giving repeated fluid without reassessing overload, cause and response.
Checkpoint rule
Do the check-up only after you can summarize each concept in one sentence and identify one dangerous pitfall from memory.
Knowledge Check (after reading)
Short check-up to confirm understanding of this module.
Check-up Questions
A 75-year-old woman with vomiting and diarrhoea has oliguria, dry mucosa and postural hypotension. Urine sediment is bland. What is the likely cause of AKI?
A patient remains oliguric after septic shock. Urine microscopy shows muddy-brown granular casts. What lesion is likely?
Answer all questions to submit.
Next step personalized recommendations
Continue learning
Move forward only after this module is stable.
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