Actually, the captain's contract was up in the middle of our cruise, and he was replaced.
As you can guess, these medical issues were a topic of conversation throughout the cruise. We were told about the World Cruise, that is nicknamed the Viking Death Cruise. They said that during a 90 day cruise, they average 10 deaths. We also were told that it is recognized that many people who know they are terminal will book a cruise at the "appropriate time," because it is their wish to die at sea. Sad.