What can be done at this point to help a viewer’s friend, who has a failing artificial heart valve?

These situations are always more complicated because his health now depends on a human solution, not a divine one. That was set in motion and now mandated by the decision to turn to medicine for his heart condition. When a surgical procedure was done to implant an artificial valve, that was human choice creating a karmic consequence that his life would then be dependent on a human device and its reliability, lifespan, effectiveness, and potential side effects. We can help to shore things up but cannot guarantee overriding the consequence of a deteriorating implant. For this purpose, it is highest and best to do Protocol session work in addition to prayers because there are factors involved with vulnerability that are karmic in nature that will complicate getting assistance with prolonging things before surgery is the only practical alternative for a rapid turnaround.