🧂 Electrolyte Replacement Reference
UseBedside reminder of how much, by what route and how fast to replete each electrolyte. Sodium and free-water d…
SourceElectrolyte repletion protocols (Merck Manual / Medscape)
This-shift next steps
After scoring: open the scene pack, peer scores, and the matching pathway. Local reference — no HIS write.
Paste the link in Slack, Teams, X, or LinkedIn — the preview image comes from this page’s Open Graph card.
Methodology · worked example, guidelines & full notes
IV potassium too fast/concentrated risks arrhythmia — respect the ceiling.
When to use
Bedside reminder of how much, by what route and how fast to replete each electrolyte. Sodium and free-water deficits are in the dedicated electrolyte tools.
How it works
K: oral 20–40 mmol, IV peripheral ≤ 10 mmol/h. Mg: MgSO4 1–2 g IV. Ca: gluconate 1–2 g IV slow. Phos: 0.08–0.16 mmol/kg over 2–6 h.
Key points
- IV potassium too fast/concentrated risks arrhythmia — respect the ceiling.
- Replace magnesium first; it underlies refractory hypokalaemia/hypocalcaemia.
- Calcium gluconate is preferred over chloride peripherally.
- Watch calcium-phosphate precipitation when co-infusing.
References
Worked calculation
The values below come from this tool's own example placeholders and are computed server-side with the formula shown on this page, so the arithmetic can be checked quickly. It demonstrates how to substitute values only — it is not clinical advice and not a real case.
| Electrolyte | Hypomagnesaemia |
|---|
→Repletion pointsMagnesium repletion
- IV：MgSO4 1–2 g (8–16 mEq) IV over 2–15 min (symptomatic); or 1 g/h infusion over ~10 h; ≤ ~50 mEq/24 h
- Renal function：Reduce dose and rate if GFR is low
- Key：Hypomagnesaemia causes refractory hypokalaemia/hypocalcaemia — replace together
| Electrolyte | Hypokalaemia |
|---|
→Repletion pointsPotassium repletion
- Oral：KCl 20–40 mmol, up to 100 mmol/day (mild-moderate, K 2.5–3.2)
- IV：Peripheral ≤ 10 mmol/h (concentration ≤ 30–40 mmol/L); central line + monitoring ≤ 20 mmol/h
- Key：Replace magnesium concurrently (otherwise hard to correct); deficits often take days; monitor ECG and potassium
Verification & sources · governance
FAQ
Frequently asked questions
- What are the limits and cautions when using Electrolyte Replacement Reference?
- For licensed clinicians and clinical researchers. Interpret results with history, investigations and local protocols; not a diagnosis or prescription, and not a substitute for multidisciplinary decision-making or local guidelines.
- Does Electrolyte Replacement Reference upload patient data? Where is it calculated?
- Calculation runs locally in the browser; inputs and results are not uploaded. For licensed clinicians only; interpret with history, investigations and local protocols — not a diagnosis or prescription.
- How is Electrolyte Replacement Reference calculated in practice? Can you show a worked example?
- Inputs: Electrolyte Hypomagnesaemia → Result: Repletion points Magnesium repletion（IV: MgSO4 1–2 g (8–16 mEq) IV over 2–15 min (symptomatic); or 1 g/h infusion over ~10 h; ≤ ~50 mEq/24 h, Renal function: Reduce dose and rate if GFR is low, Key: Hypomagnesaemia causes refractory hypokalaemia/hypocalcaemia — replace together） Inputs: Electrolyte Hypokalaemia → Result: Repletion points Potassium repletion（Oral: KCl 20–40 mmol, up to 100 mmol/day (mild-moderate, K 2.5–3.2), IV: Peripheral ≤ 10 mmol/h (concentration ≤ 30–40 mmol/L); central line + monitoring ≤ 20 mmol/h, Key: Replace magnesium concurrently (otherwise hard to correct); deficits often take days; monitor ECG and potassium）