Your brother's current health condition is not so good.
He needs to be definitely on cardiac Inotropic agents like digoxin
. Diuretics help in such scenario when there is retention of water in the legs.
Please discuss with his treating doctor regarding the same. Frequent changes in the dosage needs to be done depending on the improvement of the patient's condition.
This is a very brief answer. He needs further evaluation and constant monitoring too.
I wish him speedy recovery.