Can an Aortic Aneurysm be proven to be caused at work?

My husband had a stress test a couple years ago because he has a leaking Aortic valve. The stress test turned out fine. Then about 6 months ago he had pains in his chest and found out he had an Aortic Aneurysm. His work description says he needs to be able to lift 50lbs, but many times at work, he is told to lift more than 50lbs like putting on new plow blades. The doctor has said that he can not lift more than 50lbs now because it will make it worse. My question is, has there been any workers compansation cases that have proven that an aneurysm was caused by heavy lifting at work. His family has heart problems, but they are blockage type problems.