hyperkalaemia

ECG changes

Peaked T-waves (even when inverted)
Widening of the QRS (often marked)
Prolonged PR-interval
Flattening and eventual loss of P-waves
Bizarre tachydysrhythmias, pseudo VT
Bizarre bradydysrhythmia, advanced AV Blocks and sinus pauses
Axis changes (especially RAD)
Fascicular & Bundle Branch Blocks
Pseudo ACS patterns with ST-segment changes (can mimic STEMI)
- (usually no RAD)
Pseudo Brugada syndrome pattern
Sine wave morphology

References