Hello! Thank you for asking on Healthcaremagic! I would like to directly review his ECG, if you can upload it for a more professional opinion. At his age, coronary artery disease would be really exceptional. Anyway, every ECG finding should be evaluated in correlation with the clinical symptoms and cardiac enzyme levels. I would also recommend performing a cardiac ultrasound and an exercise cardiac stress test, especially in case of abnormal cardiac enzymes. A chest X ray study coupled with pulmonary function tests is also necessary to exclude a possible lung disorder. Hope you will find this answer helpful! Wishing all the best, Dr. Iliri