Has anyone else had the strange experience of the mechanical aortic valve responding to loud, low noise? I've had this twice now, once with a motorbike roaring past. The other was last night at the theatre sitting 2nd row back near bass speakers ro watch a west end musical about a rock group. It wasn't so much the volume as the thump of the bass which seemed to male my heart thump harder too. It made me feel a bit odd & I broke out in a sweat. I had to be asked to be moved further back, explaining that it was my heart valve rather than being a grumpy old man!