Hyperkalemia management vs Hypokalemia management
How to tell Hyperkalemia management and Hypokalemia management apart when a board question makes them look alike.
Step 2 CK pairs are in open beta while clinical review finishes. Spot an issue? Tell us.
ECG instability in hyperkalemia is the immediate branch that mandates IV calcium first.
Side by side
Potassium elevation with ECG changes requires immediate cardiac membrane stabilization before shifting or removing potassium.
Potassium depletion, especially below 2.5 mEq/L or with ECG changes, requires prompt repletion plus magnesium correction.
Reduced renal excretion, cellular release, or medication effects raise extracellular potassium and destabilize cardiac conduction.
GI losses, renal wasting, or intracellular shifts lower serum potassium and predispose to arrhythmia and muscle weakness.
Severe risk features include K above 6.0 mEq/L, peaked T waves, QRS widening, and sine-wave progression; management includes calcium, intracellular shift, and elimination.
Hypokalemia risk rises at K below 3.0 mEq/L and becomes urgent below 2.5 mEq/L or with U waves, QT prolongation, or ventricular ectopy; concurrent magnesium is often low.
The trap
A common error is giving insulin before calcium in unstable hyperkalemia, or replacing potassium without checking magnesium in persistent hypokalemia. The resolving clues are ECG danger signs and concurrent magnesium deficiency.
The repair move
Next best step: give 10 mL of 10 percent calcium gluconate IV over 5 to 10 minutes for ECG changes, then shift potassium with regular insulin 10 units IV plus dextrose 25 g and consider nebulized albuterol 10 to 20 mg. Remove potassium with loop diuretic, potassium binder, or urgent dialysis as indicated. For hypokalemia, replete magnesium and give oral potassium if stable or IV potassium chloride 10 mEq/hour per peripheral line for severe deficits.
Try a free question
CoreA patient has potassium 6.9 mEq/L and QRS widening on ECG. What is the next best step in management?
Show answer and explanation
Answer: A. Administer IV calcium gluconate. ECG toxicity from hyperkalemia requires immediate cardiac membrane stabilization with IV calcium.
Why the other choices are tempting
- B. Oral potassium worsens hyperkalemia.
- C. Bicarbonate alone is insufficient in severe ECG-toxic hyperkalemia.
- D. Delay risks malignant arrhythmia.
- E. Thiazide alone is too slow and not definitive in severe cases.
Flashcards
Tap a card to flip it.
What is the first drug for hyperkalemia with ECG widening?
IV calcium gluconate to stabilize the myocardium immediately.
What adjunct pair shifts potassium intracellularly in hyperkalemia?
IV regular insulin with dextrose, often with high-dose nebulized beta-agonist.
Quick answers
What is the fastest way to tell Hyperkalemia management from Hypokalemia management?
ECG instability in hyperkalemia is the immediate branch that mandates IV calcium first.
What is the key clue for Hyperkalemia management?
Potassium elevation with ECG changes requires immediate cardiac membrane stabilization before shifting or removing potassium.
What is the key clue for Hypokalemia management?
Potassium depletion, especially below 2.5 mEq/L or with ECG changes, requires prompt repletion plus magnesium correction.
What is the common trap with Hyperkalemia management vs Hypokalemia management?
A common error is giving insulin before calcium in unstable hyperkalemia, or replacing potassium without checking magnesium in persistent hypokalemia. The resolving clues are ECG danger signs and concurrent magnesium deficiency.