Interesting discussion. I remember back to grad school where I think I was told percussion was contraindicated in the post CABG patient. I also tend to feel vibration was as well but am not sure of any literature that supports the claim that it is in fact dangerous? If anyone can find such a study or can point us to a link where we can read about the negative results of vibration methods as a treatment method in the post CABG patient then this would be very useful. Then again maybe it is time to reconsider our position on this method of treatment, perhaps specifically in relation to the surgical method and tools used to secure the graft - i.e. modern methods and tools vs. old techniques and tools.