In hyperkalemia, there are certain changes in the ECG. When the potassium level is >5.5 mmol/L, the ECG will show an elevated T wave, a narrowing of the base, a tent-like shape, and a shortening of the QT interval. When the potassium level is >6.5 mmol/L, there is a widening of the QRS wave group in addition to the T-wave elevation. When the blood potassium is >8mmol/L, the QRS wave group will be further accelerated, and in some cases, the right bundle branch conduction block or left bundle branch conduction block pattern will be observed, the P wave amplitude will be reduced, the PR interval will be prolonged, and the T wave will remain elevated. The performance. When the potassium level is >10 mmol/L, sinus-ventricular conduction may occur, and the QRS wave group of the ECG may widen significantly, forming a bidirectional wave pattern with the elevated T wave. The delayed intraventricular conduction may induce retrograde ventricular arrhythmias, such as ventricular tachycardia, and ventricular fibrillation.