Finnish to English Medical Medical (general)

"rytminsiirto" seems to be a common concept in cardiology.

E.g., a questionnaire for a cardiac study asks how many "rytminsiirrot" the patients have previously had.

However, thus far, my searches for an English equivalent have turned up nothing secure.
(For example, the hits I get for "rhythm transfer" generally seem to be translations of "rytminsiirto" itself.)

"rytminsiirto" = ???

Thanks