BoardsBridgeClinical Disease
physiology
High-impact pattern
Insulin-Mediated Potassium Shift for Hyperkalemia
Intracellular K+ redistribution via Na/K-ATPase — dose, onset, dextrose pairing, and the delayed-hypoglycemia trap
Insulin activates Na/K-ATPase to shift serum K+ intracellularly within 15-30 min, peaking 30-60 min and lasting 4-6 h; it does NOT eliminate K+ from the body, so always co-administer dextrose and plan a removal strategy.
If you forget
10 U regular insulin IV + 25-50 g dextrose — always pair them
Board trap
Chronic ESRD patient presents with K+ 7.2 and peaked T waves. You give calcium, then insulin + dextrose. At 75 min the patient is obtunded with glucose 38 — exam wants you to know that HYPOGLYCEMIA is DELAYED past the K+ nadir, and that ESRD patients have impaired insulin clearance, prolonging the hypoglycemia window.
Key numbers
- Regular insulin: 10 U IV (onset 15-30 min, peak 30-60 min, duration 4-6 h)
- Dextrose: 25-50 g IV concurrently (25 g if glucose 140-250, 50 g if <140, omit only if glucose >250-300)
- Expected serum K+ drop: 0.5-1.2 mEq/L within 30-60 min
- Calcium gluconate 10%: 1-2 g (10-20 mL) IV over 2-5 min if ECG changes
- Albuterol: 10-20 mg nebulized (synergistic, mechanism distinct from insulin)
- Glucose recheck: q15-30 min × 2 h, then q1h × 4 h after insulin-dextrose
Reviewed Sep 15, 2026 for clinical accuracy by BoardsBridge Editorial Process
Drill this as a SOE stem →Uri Rozen, MD — Licensed Physician, Israel
Source guidelines: KDIGO AKI 2012 · KDIGO AKI 2012
Re-review cadence: 12 months from reviewed date.
Related on BoardsBridge
Card ID: potassium-shift-insulin · Path: aba.physiology.renal-and-electrolyte.potassium-shift-insulin