Bright muscle, weak heart, bad start?

33 year-old female presented with fatigue, dysp-noea, progressive muscle weakness, signs of clinicalheart failureandanelevatedCK(4113U/L).Cardiacmag-netic resonance (CMR) demonstrated a mildly dilatedleft ventricle (LV) with severe systolic dysfunction (ejec-tion fraction 28%) and a pericardial effusion (