MICA · FIRST-LINE LEARNING NOTES
Understand, prioritise and organise follow-up
Assess sodium and potassium disorders by symptoms, speed of onset, ECG and kidney context, with monitored correction.
Recognise neurological or cardiac danger
Confusion, seizure, reduced alertness, marked weakness, palpitations or syncope with an electrolyte abnormality require urgent assessment. Hyperkalaemia may threaten cardiac rhythm without preceding symptoms; an apparently normal ECG does not exclude danger. Symptomatic hyponatraemia requires appropriate hospital care. Severity depends on the rate of change and patient context as well as the deviation from the reference range.
[1][2]Confirm and explain the abnormality
Review sampling conditions, previous results, creatinine, glucose and medicines. Haemolysis can produce spurious hyperkalaemia: promptly discuss repeat sampling with the laboratory without delaying care for a dangerous presentation. For sodium abnormalities, assess gastrointestinal losses, water intake, diuretics and signs of depletion or overload. Urine osmolality and sodium can help explain hyponatraemia once the immediate emergency is secured.
[1][2][3]Consider the rate of change as well as the magnitude of an electrolyte abnormality. A normal ECG does not exclude risk from significant hyperkalaemia. Hyponatraemia with neurological features needs monitored care; correction depends on symptoms, duration and demyelination risk. Repeat sampling must not delay referral when the presentation is dangerous.
[1][2]Avoid improvised correction
Disposition depends on symptoms, ECG, degree of abnormality, kidney function and monitoring capacity. Severe hyperkalaemia requires immediate care. Marked or symptomatic hypokalaemia also carries arrhythmia risk; intravenous replacement requires an appropriate setting and monitoring. Overly rapid sodium correction can cause harm: the rate and targets must be prescribed by an experienced team rather than applied mechanically from a formula.
[1][4][2]- For a critical result, contact the laboratory and communicate units, sample quality and previous values.
- Do not improvise rapid sodium correction or intravenous potassium replacement in outpatient care.
- After stabilisation, identify the cause and plan monitoring suited to medicines and renal function.
Monitor the biochemical trajectory
After intervention, monitor clinical and biochemical progress according to the disorder, treatment and risk of rebound or overcorrection. Record intake, losses, urine output and medically directed medication changes. Persistent hypokalaemia should prompt consideration of hypomagnesaemia or ongoing losses. At discharge, clearly assign responsibility for laboratory follow-up and explain warning symptoms; no single monitoring interval suits every situation.
[1][4][2][3]A learning situation
FICTIONAL CASE · SELF-REFLECTION WITHOUT A SCORE
A patient with kidney disease has a very high potassium result. He feels well and has no obvious ECG changes. The laboratory reports possible haemolysis.
Can this wait until the next routine appointment?
Read the reasoning
No. Prompt severity assessment, discussion with the laboratory and urgent confirmation appropriate to the context are required. Haemolysis may explain the result, but kidney disease makes true hyperkalaemia plausible. Absent symptoms or obvious ECG changes do not justify unmonitored delay; confirmation and safety measures must proceed together.
References and scope
- UKKA Clinical Practice Guideline — Management of Hyperkalaemia in Adults, updated July 2026 ↗
- Ball et al. Emergency management of severe symptomatic hyponatraemia in adult patients. Endocr Connect. 2016;5:G4–G6 ↗
- Intravenous fluid therapy in adults in hospital — CG174: Recommendations (updated May2017) ↗
- Treating acute hypokalaemia in adults — 14 August 2024 ↗
Original educational synthesis for adult first-line practice. International references must be interpreted with the clinical setting and local care pathways. Independent human scientific review remains to be confirmed.