ECG library
Hyperkalemia
coreThe 58-year-old from the lab module: weakness, potassium 7.1.
25 mm/s · 10 mm/mV · synthetic tracing
100%
Calipers:2000 ms50.0 small boxes30 bpm if R-RDrag the orange markers. One small box = 40 ms.
Key findings
- Peaked tented T waves
- Flattening P waves
- Widening QRS
- The end-stage is a sine wave
Learning points
- The progression is ordered: peaked T, long PR, flat P, wide QRS, sine wave, arrest.
- Any QRS widening in hyperkalemia is a calcium-now indication.
- The ECG can be deceptively quiet; a critical potassium with any change is treated as an emergency.
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