I am having trouble with low blood pressure, shortness of breath and fast resting heart rate. i have idiopathic dcm and bi vent pm. ef is 38% why?

Ineffective pumping: Your heart is failing as a pump, that is why your ejection fraction is only 38%. Ejection fraction means your heart is pushing out 38% of blood per beat. As heart pumps out less and less, it will try to compensate by beating faster, and you will have symptoms such as shortness of breath.

Not sure: Your diagnosis of "idiopathic" dcm means that the cause is not known. There are many good treatments for your condition, you may benefit from a medication change, change in diet, or change in exercise program.

Cardiac function: A low BP absent orthostasis or symptoms is preferred with low EF, high HR at rest & breathlessness need to be evaluated & pharmacologically addressed,aerobic excercise will help,talk to treating cardiologist.