ECG Case 201 Interpretation

This post is an answer to the ECG Case 201

  • Rate: 60 bpm
  • Rhythm:
    • Sinus Arrhythmia
  • Axis:
    • Normal (50 deg)
  • Intervals:
    • PR – Prolonged (~220ms)
    • QRS – Normal (100ms in lead II, prolonged in lead V2)
    • Apparent QT – 680ms (QTc Bazette ~ 710 ms)

  • Segments:
    • ST Depression in Leads I, II, V2-6
    • ST Elevation in aVR
  • Additional:
    • Ventricular Ectopic
    • Prominent U waves
    • T-U Fusion
      • Best visualised in leads II, III, aVF, V2-6
      • Initial T wave is inverted and merges with large U wave
      • Results in apparent QT prolongation due to fusion
      • Best considered QU prolongation
ECG of Hypokalaemia
ECG of Hypokalaemia


Multiple ECG features consistent with hypokalaemia +/- hypomagnesaemia. This patient had a K+ of 1.6 mmol/L confirmed by a VBG.

READ MORE: Hypokalemia ECG Changes [With Examples]