| Serum potassium (mmol/l) | Major change |
|---|---|
| 5.5-6.5 | Tall peaked T waves |
| 6.5-7.5 | Loss of P waves |
| 7.0-8.0 | Widening of QRS complexes |
| 8.0-10 | Sine wave, ventricular arrhythmias, asystole |
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