Special type of waves

Question 1

Epsilon waves

Answer 1

The epsilon wave is a small positive deflection (‘blip’) buried in the end of the QRS complex.
It is the characteristic finding in arrhythmogenic right ventricular dysplasia (ARVD).

Question 2

J waves

Answer 2

The Osborn wave (J wave) is a positive deflection at the J point (negative in aVR and V1)
It is usually most prominent in the precordial leads

Characteristically seen in hypothermia (typically T<30C), but they are not pathognomonic