Flutter or fibrillation?

Cardiac causes need to be considered in a male patient presenting with the sole symptom of shortness of breath.

A MALE aged 67 presents to you with a two-month history of increasing lethargy and shortness of breath after exertion. He has felt a bit light-headed at times during this period but has not had any palpitations or chest pain. 

He does not report a cough, fevers or haemoptysis. He is a non-smoker and has not had any recent overseas travel. He is overweight (BMI 34) and is on irbesartan for hypertension. He drinks 1-2 standard drinks of alcohol three