Respected Sir, hi I evalauted your query thoroughly. Congestion with cough is due to Respiratory Infection following decreased immunity of the lung by bacteria and absolutely not due to stent at all. Certain steps you have to follow at home to help him out for fast recovery: * Continue current medications as per advise by cardiologist. * He must perform Deep Breathing Exercises with YOGA at least 30-40 min mor and eve very regularly which is pivotal in his case. * Tincture Benzoind vapour inhalations 2-3 times a day also helps great. * Maintain his hydration , blood sugar and BP levels. * Encourage to rest at home also in semireclining position not straight one. * Try to manage some amount of walking at least not much then also. * Avoid smoking / tobacco / alcohol if consuming. * Avoid much oily / spicy / nonveg / high sugar stuffs. * Should have adequate sleep of 8 hours. * In our clinic we recommend antibiotics, decongestants according to sputum culture report along with other laboratory parameters , X-Ray findings titrated with clinical findings. Hope this clears your query upto my level best. Thanks for using Health Care magic and reviewing my answer. Regards Wishing your father fast speedy recovery from the same. Bye Dear Take care.