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The patient could have a disease that prevents effective use of the ATH.

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-http://www.nhlbi.nih.gov/health/health-topics/topics/tah/
https://www.cms.gov/Medicare/Coverage/Coverage-with-Evidence-Development/Artificial-Hearts.html

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Blood Clots
Bleeding
Infection
Device Malfunctions
( Power may stop working well )

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Estimates of the cost of the artificial heart include charges for the surgical procedure, device and console, and continuing medical surveillance. These estimates range from a low of $100,000 to a high of $300,000 per patient in the initial year.

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- People who need heart transplants can benefit from a Total Artificial Heart.
- If your life expectancy is less than 30 days and you're not eligible for a heart transplant, a TAH may extend your life beyond the expected 30 days.
- A TAH is a "last resort" device. This means only people who have tried every other type of treatment, except heart transplant, can get it.

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In Carmat’s design, two chambers are each divided by a membrane that holds hydraulic fluid on one side. A motorized pump moves hydraulic fluid in and out of the chambers, and that fluid causes the membrane to move; blood flows through the other side of each membrane. The blood-facing side of the membrane is made of tissue obtained from a sac that surrounds a cow’s heart, to make the device more biocompatible.

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1947- MD Kloff begins research on designing a heart- lung machine, and artificial heart.
1957- At Cleveland Clinic, Dr. Kolff and Dr. Tetsuzo Akutsu bring the concept of an artificial heart to reality through a series of animal implants; a dog survives for  90 minutes.
1973-  Calf "Tony" lives 30 days on an early Kolff Total Artificial Heart.
1998- La Pitie Hospital in Paris performs its 100th implant of the Total Artificial Heart.
2004- The CardioWest becomes the world's first and only FDA-approved Total Artificial Heart. While originally used as a permanent replacement heart, the Total Artificial Heart is approved for use as a bridge to transplant in cardiac transplant-eligible candidates at risk of imminent death from biventricular failure.
2013- At 74 years old, Bob Phillips becomes the oldest Total Artificial Heart patient to leave the hospital using the Freedom® portable driver when he is discharged from Penn State Hershey Medical Center.