My question is how kussmaul sign is positive in rhabdomyoma although it impairs the filling of left ventricle not the right ventricle?kussmaul sign is positive whenever there is impaired filling of the right ventricle!
Rhabdomyoma can be found in the right ventricle too, that's when it's most likely to lead to a positive sign. However, for left sided tumours causing a positive sign, my best guess would be a mass effect leading to RV distortion.