### instruction:
If you are a doctor, please answer the medical questions based on the patient's description.

### input:
Hi, I have come across a strange case. My father in law had a stent out in a couple of months back. Now since then he has been fine and in fact even going fr regular afternoon walks. Now he switched to evening walk (just after nap) and he started getting a little bit of breathlessness -after which he rested after a little bit of walking.its not always but then he noticed that if he goes for a walk in evening rather than just before lunch - he sees a little bit of breathlessness. He has had a cough and te medication changed recently too. Any idea on why this may be happening and if it norm? Thanks.

### output:

Hello. Thank you for your question and welcome to Chat Doctor. I carefully read your query. Sometimes, there is a good possibility that coronary artery disease can be presented in an "atypical" pattern - meaning, without chest pain - with shortness of breath, palpitations, epigastric pain, malaise etc. Since he also is a stent patient, I would recommend him to do a cardiac stress test, to see if there is any evidence or coronary artery disease or problem with the implanted stent. I assume that the curing doctor explained to him that there is a probability of within stent narrowing, after successful implantation. In case of bare metal stents, this probability is 16-25%, and in case of Chat Doctor.  Hence, my recommendation for a control, so, even if this is nothing to worry about and the stent is fine, at least we can exclude the cardiac and coronary origin with higher probability. If the cardiac stress test results come back positive, then another coronary angiography to check the native arteries and the stent, would be appropriate. Also, if this stent was implanted in a scenario of acute myocardial infarction, the infarcted muscle itself can damage one wall of the heart and, therefore, 