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The 4-month-old is critically ill with a severe case of pulmonary valve stenosis, a heart valve disorder.

When he was born, Dylan was diagnosed with moderate hydrocephalus, which is a build-up of fluid in the brain, as well as a heart condition called pulmonary valve stenosis, Pantoja said.

“Thanks to the team at the Cleveland Clinic, I have a new aortic valve to go along with my new pulmonary valve from my last surgery,” he wrote.

She is due to undergo a pulmonary valve replacement with a specialist surgeon in Newcastle to rectify the problems.

But when these TEHVs are implanted into sheep hearts to replace the native pulmonary valve, they undergo adverse remodelling changes after 12 months.