Featured Research

from universities, journals, and other organizations

Video Game Technology May Help Surgeons Operate On Beating Hearts

Date:
June 16, 2008
Source:
Children's Hospital Boston
Summary:
To do complex cardiac repairs while the heart is still beating, surgeons need images that show depth -- especially when navigating inside the hearts of children and newborns. Now cardiac surgeons report good results with a technology borrowed from the gaming industry: flickering glasses that provide stereoscopic vision.

When surgeons patched holes guided by ordinary 3-D ultrasound, they anchored their patches askew (left). Aided by stereoscopic vision (middle), they secured the patches with more evenly-spaced anchors (middle), results nearly as good as those with open-heart surgery (right).
Credit: Images courtesy Nikolay Vasilyev, MD, Children’s Hospital Boston

Surgery has been done inside some adults' hearts while the heart is still beating, avoiding the need to open the chest, stop the heart and put patients on cardiopulmonary bypass. But to perform intricate beating-heart operations in babies with congenital heart disease or do beating-heart complex repairs in adults, surgeons need fast, highly sophisticated real-time imaging that allows them to see depth. In an NIH-funded study featured on the cover of the June Journal of Thoracic and Cardiovascular Surgery, cardiac surgeons from Children's Hospital Boston report good results with a simple technology borrowed from the gaming industry: stereo glasses.

The researchers, led by Pedro del Nido, MD, and Nikolay Vasilyev, MD, of Children's department of cardiac surgery, had already been testing a three-dimensional ultrasound imaging system. But although the images are 3D and displayed in real time, they give little indication of depth. In animal tests, surgeons trying to navigate surgical tools inside the heart became disoriented when guided by these images.

Del Nido, chief of Cardiac Surgery at Children's, realized that what they needed was stereoscopic vision. Watching the flat picture on the computer screen was like watching a baseball game on TV, he says. "It's good enough to follow what's happening in the game, but you could never grab a ball in mid-flight," del Nido explains.

So collaborator Robert Howe, PhD, of Harvard University, plucked a solution from video games -- splitting computer images in two and cocking them at slightly different angles. When wearing gamers' flickering glasses, users can see ultrasound images of the beating heart as a hologram. "You definitely have depth perception," says Vasilyev. "You feel like you're inside the heart chamber."

Vasilyev tested the glasses while operating on pigs with an atrial septal defect, a common form of congenital heart disease in which there is a hole in the wall dividing the heart's upper chambers. Vasilyev closed each defect using a catheter carrying a tiny patch, threaded into the heart through a vein. Using another device, he fastened the patch around the hole with tiny anchors. In all, he placed 64 anchors: 32 under standard 3D ultrasound guidance, and 32 using the stereoscopic vision display.

Using the stereoscopic display, Vasilyev was able to place the anchors 44 percent faster than with the standard display (9.7 versus 17.2 seconds). The tip of the anchoring device also navigated more accurately -- deviation from the ideal path averaged 3.8 millimeters, as compared with 6.1 millimeters, a 38 percent improvement.

The accuracy of anchor placement didn't differ significantly between the two sets of tests, perhaps because of Vasilyev's high level of experience and the availability of tactile information to help guide the final step of driving in the anchors. However, the speed of the anchor placement improved significantly. The researchers believe that the ability to precisely navigate tools inside the beating heart will minimize risk to neighboring heart structures.

Clinical trials of beating-heart surgery with the patching system could begin in children with ASDs this year, Vasilyev says.

Del Nido believes that stereoscopic imaging -- coupled with recent advances in catheter-based surgical tools -- will eventually allow surgeons to do much more complex operations on beating hearts, such as closing more complicated holes, shaving away excess tissue or repairing fast-moving structures like mitral or aortic valve leaflets. "We look at some very unusual cardiac anatomy," he says. "Half the battle is figuring out what the structure is without opening up the heart."

For children, being able to do beating-heart surgery is a real advantage, del Nido adds. The large incisions can scar the heart and disrupt its rhythm, occasionally requiring a pacemaker. Opening the heart invites infection, and air bubbles can slip into the bloodstream and damage the brain. Running blood through a bypass machine can sometimes launch an inflammatory response, damaging organs throughout the body. And even in uncomplicated open-heart surgeries, recovery times are weeks to months.

The real-time stereoscopic visualization system was designed to handle and render 30MB of data every second. The renderer was implemented on a GeForce FX 7800 (nVidia Corp., Santa Clara, Calif.).

The work was supported in part by the National Institutes of Health.


Story Source:

The above story is based on materials provided by Children's Hospital Boston. Note: Materials may be edited for content and length.


Cite This Page:

Children's Hospital Boston. "Video Game Technology May Help Surgeons Operate On Beating Hearts." ScienceDaily. ScienceDaily, 16 June 2008. <www.sciencedaily.com/releases/2008/06/080610161311.htm>.
Children's Hospital Boston. (2008, June 16). Video Game Technology May Help Surgeons Operate On Beating Hearts. ScienceDaily. Retrieved July 24, 2014 from www.sciencedaily.com/releases/2008/06/080610161311.htm
Children's Hospital Boston. "Video Game Technology May Help Surgeons Operate On Beating Hearts." ScienceDaily. www.sciencedaily.com/releases/2008/06/080610161311.htm (accessed July 24, 2014).

Share This




More Health & Medicine News

Thursday, July 24, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Idaho Boy Helps Brother With Disabilities Complete Triathlon

Idaho Boy Helps Brother With Disabilities Complete Triathlon

Newsy (July 23, 2014) An 8-year-old boy helped his younger brother, who has a rare genetic condition that's confined him to a wheelchair, finish a triathlon. Video provided by Newsy
Powered by NewsLook.com
Thousands Who Can't Afford Medical Care Flock to Free US Clinic

Thousands Who Can't Afford Medical Care Flock to Free US Clinic

AFP (July 23, 2014) America may be the world’s richest country, but in terms of healthcare, the World Health Organisation ranks it 37th. Thousands turned out for a free clinic run by "Remote Area Medical" with a visit from the Governor of Virginia. Duration: 2:40 Video provided by AFP
Powered by NewsLook.com
Stone Fruit Listeria Scare Causes Sweeping Recall

Stone Fruit Listeria Scare Causes Sweeping Recall

Newsy (July 22, 2014) The Wawona Packing Company has issued a voluntary recall on the stone fruit it distributes due to a possible Listeria outbreak. Video provided by Newsy
Powered by NewsLook.com
Huge Schizophrenia Study Finds Dozens Of New Genetic Causes

Huge Schizophrenia Study Finds Dozens Of New Genetic Causes

Newsy (July 22, 2014) The 83 new genetic markers could open dozens of new avenues for schizophrenia treatment research. Video provided by Newsy
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins