World’s First Pig Heart Transplant in Human is Successfully Done

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In a rare medical feat, US doctors have successfully transplanted a genetically-modified pig heart to a 57-year-old patient with terminal heart disease.

The patient, David Bennett, a Maryland resident who had been hospitalized and bedridden for the past few months, is doing well three days after a first-of-its-kind surgery, said doctors at the University of Maryland Medicine (UMMC) in a statement.

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The organ transplant demonstrated for the first time that a genetically modified animal heart can function as a human heart without immediate rejection by the body.

Bennett was deemed unfit for a conventional heart transplant or an artificial heart pump due to a life-threatening arrhythmia. This irregular heartbeat condition can lead to cardiac arrest or stroke. To remain alive, he was also connected to a heart-lung bypass machine called extracorporeal membrane oxygenation (ECMO).

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The Food and Drug Administration had granted an emergency authorization for the surgery on December 31 “in the hope of saving the patient’s life”.

The team of doctors at UMMC conducted the procedure called Xenotransplantation, wherein they “knocked out” three genes – responsible for rapid antibody-mediated rejection of pig organs by humans – in the donor pig. And then, six human genes – responsible for immune acceptance of the pig heart – were inserted into the genome.

One additional gene in the pig was also knocked out to prevent excessive growth of the pig heart tissue, which totaled 10 unique gene edits made in the donor pig.

While the process could potentially save thousands of lives, it carries a unique set of risks, including the possibility of triggering a dangerous immune response. These responses can trigger an immediate rejection of the organ with a potentially deadly outcome to the patient, the doctors said.

Thus, the physician-scientists also used a new drug and conventional anti-rejection drugs, designed to suppress the immune system and prevent the body from rejecting the foreign organ.

“This was a breakthrough surgery and brings us one step closer to solving the organ shortage crisis. There are simply not enough donor human hearts available to meet the long list of potential recipients,” said Bartley P. Griffith, who surgically transplanted the pig heart into the patient

“We are proceeding cautiously, but we are also optimistic that this first-in-the-world surgery will provide an important new option for patients in the future,” added Griffith, who is also a Professor in Transplant Surgery and Director at UMMC.

Before consenting to receive the transplant, the patient was fully informed of the procedure’s risks, and that the procedure was experimental with unknown risks and benefits.

“It was either die or do this transplant. I want to live. I know it’s a shot in the dark, but it’s my last choice,” said Bennett, the patient, a day before the surgery was conducted.

The doctors said that Bennett is being carefully monitored over the next days and weeks to determine whether the transplant provides lifesaving benefits.

“I look forward to getting out of bed after I recover,” he said.

Organs from genetically modified pigs have been the focus of much of the research in xenotransplantation, in part because of physiologic similarities between pigs, humans, and non-human primates.

The pig heart was provided by Revivicor – a regenerative medicine company based in Blacksburg, Virginia.


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