HI Fellow Aussie, The term "reversible" ischemia is a bit of a contradiction. Ischemia generally is not easily reversible. No drug, lifestyle change, diet plan or exercise routine has been developed as a reliable routine for reversing if. More commonly it is called "refractory" ischemia - meaning that for most of the elderly population the arteries become stiff and inflexible (cemented), whereas in younger people - especially children, the syptoms of ischemia (the narrowing of arteries) can be reversed as their arteries respond well to exercise and diet changes.
To just prevent the ischemia from progressing would be a great first step. My cardiologist classes it as a "progressive" disease. Whether or not people can make changes in lifestyle, diet, and exercise and stick with them each and every day in order to even halt the disease is the question we are all asking ourselves.
Cheers Beefsteak.