Had he actually died from cystic fibrosis and not tuberculosis?

Row over plan to DNA test Chopin's heart

... Witt points out that two of Chopin's three sisters had similar complaints, including multiple organ failure, and died prematurely. These symptoms strongly suggest that the Chopin family was afflicted by cystic fibrosis, says the scientist. The theory would be impossible to prove if it were not for the fact that Chopin's heart is pickled in cognac, offering the prospect of providing a few cells that could determine, from DNA tests, if he suffered from the condition. 'Once we have that in our hands it is a small matter to do a DNA test,' Tadeusz Dobosz, a geneticist at Wroclaw Medical University, told the journal Science...