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Is 18 months as long as The First artificial heart patient's survival?

It's about five times as long as The First artificial heart patient's survival
The length of The First artificial heart patient's survival is about 3.680 months.
(1982) (Dr. Barney Bailey Clark; first permanent, pneumatic device)
On December 2nd, 1982 Dr. William DeVries implanted the first artificial heart into Dr. Barney Bailey Clark, who went on to live for 3.680 months. This early model of the artificial heart was controlled and powered by an external, 146.51 kg (323 lb) machine that Dr. Clark had to cart with him as he moved throughout the hospital.
There's more! See other comparisons to 18 months...