Yu index in tissue Doppler echocardiography – Cardiology MCQ

False statement about Yu index:
a) Radial tissue Doppler dyssynchrony
b) Standard deviation of time to peak systolic velocities from the onset of the QRS complex
c) A value of 32 or more milliseconds is considered to be significant dyssynchrony
d) Can be used to assess the possibility of improvement with cardiac resynchronization therapy in heart failure
Please see the YouTube video above for the discussion