I would mention it to the insurance company, mainly because you don't want to give them any excuse not to pay up if anything did happen. However, make sure you give them the fact that in the last three years there has been no deterioration. I've never had a problem with travel insurance and always given them the full details.
It is a pre existing condition. I’ve had this for a while then nine started to shutdown so I had a replacement valve surgery. I’m still recovering from it at the moment.
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