Hello, Thank you for your question. I will try my best to help you with your questions.
unfortunately if right heart is weak then pump cannot be placed
because these pumps are placed in the left heart and they need atleast some function of the right heart
if right heart is very weak then these pumps are of no use.
I hope this answers your questions.
let me know if you have queries.
Do rate my answer as positive if no further questions. Thank you.