Conversation: The conversation between human and AI assistant.
[|Human|] My husband had aortic valve replacement and a triple bypass July of 2010.  In April of 2011 we found out the bypass failed and nothing can be done, it is the left side of his heart the area doctors call the widow maker!He has developed a chronic cough and I am worried about him.
[|AI|]  Hello! Welcome and thank you for asking on Chat Doctor! I understand your concern and would explain that his cough could be related to different possible causes: - heart failure. Does this cough worsen in lying down position? A cardiac ultrasound would help evaluate his cardiac function. In such case optimization of his actual therapy may be needed. - some medications can cause chronic cough. What is his actual therapy? Is he taking any ACE inhibitors? - a lung disorder. A chest X-ray and respiratory tests are needed too. - an allergic reaction. If all the above-mentioned causes are excluded some allergy tests may be needed. You should discuss with his doctor on the above issues. Hope you will find this answer helpful! Best wishes,