Virtual-reality (VR) tools are on the verge of becoming more commonplace in cardiovascular medicine, according to a state-of-the-art review. Once hindered by bulky technology, recent advances in computing mean that physicians are having a chance to explore new approaches to education, procedural planning and visualization, and patient care.
“Importantly, head-mounted displays have become untethered and are light enough to be worn for extended periods of time, see-through displays allow the user to remain in his or her environment while interacting with digital content, and processing power has allowed displays to keep up with human perception to prevent motion sickness,” lead author Jennifer N.A. Silva, MD (Washington University School of Medicine, St. Louis, MO)
Silva told TCTMD that while “the equipment itself has evolved so quickly,” even now “some of these headsets are clunky, and they’re big. They’re even heavy.” But much like car phones evolved into the array of mobile devices we carry with us today she also added, “what we’re already starting to see is that the hardware pieces are undergoing rapid improvement. It’s really exciting to push the boundaries [with the new devices], again keeping the patient in mind as the focus of everything we do” that makes for a more user-friendly experience.
VR, which is fully immersive, exists on the continuum of “extended reality” that’s currently being developed and applied. On the other end of the spectrum is so-called augmented reality, where virtual objects appear against a true background on a see-through display but can’t be altered. In between are merged and mixed reality, where it’s possible to interact with virtual objects on the backdrop of the real world, either through an immersive display or a see-through display, respectively.
All of these have their pros and cons, Silva said. “What’s exciting for me is to find the technology matching the need. And when you see those two things match and match well, there is a way to see patients’ anatomies and interact with those anatomies that we’ve just never been able to do before. The clinician in me has to believe that that improvement is going to end up in some way leading to some improvement for my patient. The scientist in me believes that that’s going to lead to [better understanding of heart] abnormalities in a deeper, fuller way.”
The Stanford Virtual Heart Project, among other things, is using an immersive VR headset to help pediatric patients and their families better understand cardiac anatomy as well as to teach medical students.
For preprocedural planning, the EchoPixel system (EchoPixel) enables a user wearing specialized glasses to visualize and manipulate cardiovascular anatomy. It employs True 3-D, a US Food and Drug Administration (FDA)-approved display, that works much like 3-D movie theaters and televisions.
Getting VR into procedures, though, is what excites Silva more. “That’s probably where it’s going to be most impactful to patients, and at the end of the day, that’s the Holy Grail,” she said. “That’s what we’re all chasing: how do we improve the way we take care of people?”
Silva herself has been working on Project ĒLVIS, a VR approach to imaging in electrophysiology. The system “not only empowers the interventional electrophysiologist to visualize patient-specific 3-D cardiac geometry with real-time catheter locations, but also allows direct control of the display without breaking sterility, which is a key advance,”
Another system, known as Realview (Realview Medical Imaging), has been used in the cardiac cath lab to generate real-time 3-D holograms using rotational angiography and transesophageal echocardiography.
To TCTMD, Silva said that over the next year she expects more and more of these technologies to become commercially available, gradually trickling into the “communal wisdom” of cardiovascular medicine.
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