could a heavy weight falling on chest contribute to a heart attack?

Answer 1

I don't know about that but the strain of trying to not let that happen could cause a heart attack.

Answer 2

A heavy weight falling on your chest could conceivably result in cardiac bruising which might possibly lead to tamponade. And a heavy blow to the heart can lead to dysrrhythmia. But unless you have a preexisting cardiac condition, I'd say no.