Hyperkalaemia

Tenting of the T waves is the classic appearance associated with hyperkalaemia; however ST Segment elevation may also be seen.

This is characteristically downward sloping [10].

Other features of hyperkalaemia include widening of the QRS complex and low amplitude or absent P waves.

These changes resolve as hyperkalaemia is treated. See the ECG before treatment and after treatment:

Before treatment

Fig 1: Hyperkalaemia before treatment (click on the ECG to enlarge).

After treatment

Fig 2: Hyperkalaemia after successful treatment (click on the ECG to enlarge).

PR segment prolongation is another typical sign