Asymptomatic middle-aged Caucasian woman with atypical Electrocardiogram

Caucasian woman (German origin), assymptomatic, 36 years old, functional class I, three normal children, pregnancies without problems, normotensive, negative familial background
Physical examination:nothing worthy of note. 61 kg, 1.67 m, BP = 110/70
Normal cardiovascular examination,

Preformed ECG as chek up.

Question

Which is the ECG and clinical diagnosis?

Presentación del caso