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3D-Printed Artery Model Personalizes Heart Disease Treatment

February 24, 2016 By University of Melbourne

University of Melbourne doctors and engineers are using supercomputers to create 3D models from patients with heart disease, with photos from a camera thinner than a human hair.

The images, gathered during a routine angiogram, are fed into a supercomputer. Within 24 hours, a model of a person’s artery is 3D printed. This gives cardiologists crucial information about the behavior of blood flow and the precise structure of the artery from the inside.

It also helps them make decisions about the best stent (the device used to hold open a collapsed or blocked artery) to insert.

The technique can also detect ‘hot spots’ for plaque, the waxy substance that builds up in arteries and causes heart disease. Some of these plaques have been difficult to find using traditional techniques.

The potential use of supercomputers for personalized medicine is described in an academic paper published today in the European Heart Journal.

Heart disease remains the number one killer in Australia, affecting one in every six adults.. Every nine minutes, a person suffers a heart attack. New techniques to predict plaque build up in the heart will be essential to reduce this toll. 

Lead author, University of Melbourne Associate Professor Peter Barlis, is an interventional cardiologist with St Vincent’s and Northern Hospitals.

“Using our ultrasensitive heart scans combined with models derived using supercomputers, we are now able to print out segments of the patient’s arteries and hope to tailor devices to fit them perfectly,” Assoc Prof Barlis said.

Associate Professor Peter Barlis examines a 3D printed artery.

“No two arteries are shaped the same. We’re all different, with arteries that have different branches and sizes, tapering from larger to smaller. And much like debris accumulates along a riverbank, plaque can cling to certain areas of a person’s artery. So this technology really gives us a clearer picture of those areas.

“We ideally want to use models to predict the best type of stent for a patient. Once this process is streamlined, we can have a patient on the table and an artery 3D printed and modeled to guide the procedure.”

Identifying which plaques go on to cause a heart attack remains the ‘holy grail’ of cardiology.

“Using a super-high resolution camera, known as optical coherence tomography (OCT), to scan the insides of the heart arteries has made it easier to image cholesterol plaques, but it still isn’t clear which of these plaques will go on to cause heart attacks.

“If we can identify these high-risk plaques more accurately and much earlier, we may be able to prevent heart attacks before they occur.”

Associate Professor Barlis introduced OCT to Australia in 2009 and has been refining the technology to benefit cardiac patients since. He says 3D modelling has very promising potential to predict where plaques could form and will ultimately help cardiologists predict heart attacks.

Co-author and University of Melbourne researcher Dr. Vikas Thondapu says the clues about dangerous cholesterol plaques lie in certain disturbances in blood flow patterns. 

“Our work involves using supercomputers to simulate blood flow in the arteries. The goal is to use blood flow patterns and disturbances to potentially predict the future development of high-risk plaques,” Dr Thondapu said.

Assoc Prof Barlis and his team now have two ARC grants to work with the University’s Engineering School, to find a biocompatible polymer to 3D print heart stents to precisely match a person’s physical makeup, reducing the risk of stent collapse or complications.

They are also interested in new polymers that will allow the stent to slowly disintegrate over time and that can deliver drugs directly to the location of the plaque. 

The Imperial College in London and Harvard University in Boston are collaborating with the University of Melbourne on this pioneering research.

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