Cardiac replacementedit this page

From Memory Alpha, the free Star Trek reference

A cardiac replacement is a medical procedure which replaces the heart with a parthenogenic implant. The mortality rate for this procedure is less than 2.4%.

In 2365, Doctor Pulaski ordered Captain Picard to undergo a cardiac replacement at Starbase 515 in order to fix a prior faulty replacement. (TNG: "Samaritan Snare")

In 2374, Ishka suffered a possible heart attack or cardiac arrest and had to be given a new heart by Doctor Bashir. (DS9: "Profit and Lace")