I have; in my case, though, it was completely benign by both the client’s and the physician’s account and I did not need to take any precautions. I understand that this is often the case.
That does not mean it will the same for you. I am sure you have already asked for a physician’s signature. The physician’s approval form that I use has room for the physician to write restrictions and/or any other notes to me as the trainer. Just go by what the physician recommends.