Electrolyte Abnormalities on ECG

ECG manifestations of potassium, calcium, and magnesium abnormalities. Hyperkalemia progression from peaked T waves to sine wave pattern. Hypokalemia U waves. QT prolongation and Torsades de Pointes risk.

Electrolytes

When to use this protocol

Renal failure / ESRDHyperkalemiaHypokalemiaQT prolongationTorsades de PointesElectrolyte abnormality

ECG changes often reflect the rapidity of electrolyte shifts rather than absolute serum values. Multiple electrolyte abnormalities can coexist, producing overlapping changes.

Last reviewed: February 19, 2026by SymptomDx Medical Team

Electrolyte Abnormalities on ECG

Overview

Potassium (K+) — Hyperkalemia

Potassium (K+) — Hypokalemia

Calcium (Ca2+)

Magnesium (Mg2+)

Sodium

Teaching Points

References

Electrolyte Abnormalities on ECG

Overview

Potassium (K+) — Hyperkalemia

Potassium (K+) — Hypokalemia

Calcium (Ca2+)

Magnesium (Mg2+)

Sodium

Teaching Points

References