My dad just got an angioplasty and three cardiac...

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Regarding your question,

Can cardiac patient walk and go gym normally

Mainly, it depends on the function of heart and ejection fraction. If your dad has normal ejection fraction and good capacity of heart even after angioplasty and stents, he can walk and exercise daily or three times weekly without problems. If his ejection fraction is affected like 30% he have to restrict his gym exercise to avoid complications. Thus, it is all depend on ejection fraction and health of heart.

Is MRI is contraindicated at stent patient

It is considered safe test thus cardiac patients with stent can undergo MRI test
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