Thanks for asking Health Care Magic.
Your Husband having undergone the Nuclear stress test
on his own without any problems,
at 67, mild and moderate blockage, can avoid the progress of the blockage by following simple lifestyle and dietary changes namely
1. Do regular physical mild to moderate exercise, say 30minutes of walking per day
2. Quit tobacco, if any
3. Reduce your salt intake less than 5gm/day
4. Avoid alcolol and
5. Eat more of vegatables and fruits and avoid consumption of refined carbohydrates, junk food etc.,
Above measures when combined with LOW DOSE ASPIRIN
and STATINS shall avoid further blockage and other complications.