Question:

Can a Vietnam Vet get disability for ATTR cardiac amyloidosis?

Jim's Reply:

ATTR-CM is thought to be a largely hereditary disease where proteins with unstable structures misfold and aggregate into amyloid fibrils, which deposit in the heart and other organs. 
 

I don't see any way to service connect the condition other than if you were diagnosed on active duty or you can claim that your active duty service somehow aggravated the condition. It is not a presumptive condition so service connection won't be automatic. Good luck.