Ultra sounds!
Prevention is better than a cure!
The present class 1 medical is real good at detecting pilots with a serious heart defect, BUT it's almost useless at predicting if a pilot is going to have a heart attack within the next year.
To predict the future requires a full exam by a cardiologist (The tests can be done by good nurses). Those exams are free for pilots in Germany, but might cost few quid (About 500 gbp) if done privately in India.
A full cardio exam including bike, blood and ultrasound (The ultrasound is more important, as the bike test just shows how bad the problem visible on the ultrasound is in most cases).
I fully expect the bean counters and pen pushers will get this post deleted, unless they can set up a chain of drivers only heart scan shops!