Threshold (1981)

This movie is well-worth watching and I highly recommend it for many of the reasons from others listed here. As another reviewer "tdilts9219" noted, it appears based on the famous Texas heart center in real life. Surprisingly in 1998, the fictional 1981 plot came even closer to a real life situation. In Oxford England, Aug 1998, a renowned heart surgeon Stephen Westaby placed heart replacement pump AB-180 into a young woman Julie Mills to save her life. The AB-180 was invented by George Magovern, a US inventor and has the same key property as the heart replacement in the movie. Add a few of innovations from Jeff Goldblum's fictional inventor, and AB-180 would be a match for the movie. Wait another decade, and it might be another case of sci-fi preceding reality. (source Reader's Digest, April 2000)