Your dad is suffering from multiple problems of wheezing
, has had an open heart surgery recently. These indicate that his health is not in a very good condition.
He should continue on Deriphyllin
retard for his wheezing problem. Your dad definitely needs a major lifestyle modification done. He needs to get more active physically, do regular walking and exercises. He should watch his diet; reduce on high fat food intake.
He must be in constant touch with his primary care
Hope this helps.
Wishing your dad a healthy life.