Two weeks ago, the youth from Melbourne's south-east became the first person in Australia to be implanted with an MRI-compatible pacemaker.

The procedure, performed at Southern Health's MonashHeart, will allow Marcus to undergo the scans he needs to monitor his genetic heart condition.

Marcus has Marfan syndrome, a genetic disorder of the connective tissue. A twisted leg and defects of the heart valves and aorta necessitate regular scans.

Marcus said he had felt great since the pacemaker was implanted two weeks ago to regulate his heart beat.

"I have energy to walk around. Before, I could only walk 50 metres before feeling light-headed and short of breath."

Marcus's mother, Lauren Delaney, said after eight weeks of worry and tension about the operation, it was great to see him do so well.

"He has energy, he can walk, he can just about do cartwheels.

"I think for him to run around with his mates when he returns to school will be fantastic."

Paediatric cardiac surgeon Andrew Cochrane said

Marcus had many issues that needed to be observed through MRI scans, so it was important to use an MRI-compatible pacemaker system that would not be interrupted or malfunction during scans.