Featured Research

from universities, journals, and other organizations

Modern Implantable Heart Devices Safe For Use In MRI Scans

Date:
March 16, 2005
Source:
Johns Hopkins Medical Institutions
Summary:
Johns Hopkins scientists have found that modern implanted heart devices -- such as pacemakers and defibrillators -- are safe for use in magnetic resonance imaging (MRI) machines, a diagnostic and imaging tool long ruled potentially unsafe and off-limits for more than 2 million Americans who currently have them in their bodies.

Johns Hopkins scientists have found that modern implanted heart devices -- such as pacemakers and defibrillators -- are safe for use in magnetic resonance imaging (MRI) machines, a diagnostic and imaging tool long ruled potentially unsafe and off-limits for more than 2 million Americans who currently have them in their bodies. The Johns Hopkins team has also developed new guidelines for their use, making MRI scans more available to people who might benefit from early detection of cancer and other diseases, when treatments are most likely to succeed, and for guiding devices during minimally invasive surgery.

During a four-month period, the Johns Hopkins team tested 18 different pacemakers and 15 implantable defibrillators previously found safe in animal experiments. In a study of 33 patients undergoing 38 separate scans, the researchers adjusted the device's pacing program and lowered MRI sequence energy levels to see if the scan affected the settings or caused any other kind of problem, such as heating of the electrical leads and surrounding tissue. All patients and devices were closely monitored during the scans, some of which lasted up to 1.5 hours, and repeat measurements weremade on average 24 days after the MRI to measure any long-term complications. No ill effects were observed. The only complaint cited was claustrophobia, which is commonly associated with the close confines of the MRI scanner.

The researchers' new guidelines caution that only modern devices, predominantly models from the past seven years, are safe in MRIs and call for low-energy-level scans, avoiding scan settings higher than 2 watts per kilogram, which might lead to overheating. The protocol also advises close monitoring by a cardiologist and a radiologist, and using MRIs only when clinically necessary and when alternative diagnostic tests are not recommended.

Evaluation of a safety protocol for clinically indicated magnetic resonance imaging of patients with permanent pacemakers and implantable defibrillators at 1.5 Tesla. Saman Nazarian, Ariel Roguin, Menekhem Zviman, Albert Lardo, Timm Dickfield, Ronald Berger, David Bluemke, and Henry Halperin.


Story Source:

The above story is based on materials provided by Johns Hopkins Medical Institutions. Note: Materials may be edited for content and length.


Cite This Page:

Johns Hopkins Medical Institutions. "Modern Implantable Heart Devices Safe For Use In MRI Scans." ScienceDaily. ScienceDaily, 16 March 2005. <www.sciencedaily.com/releases/2005/03/050309103614.htm>.
Johns Hopkins Medical Institutions. (2005, March 16). Modern Implantable Heart Devices Safe For Use In MRI Scans. ScienceDaily. Retrieved April 23, 2014 from www.sciencedaily.com/releases/2005/03/050309103614.htm
Johns Hopkins Medical Institutions. "Modern Implantable Heart Devices Safe For Use In MRI Scans." ScienceDaily. www.sciencedaily.com/releases/2005/03/050309103614.htm (accessed April 23, 2014).

Share This



More Health & Medicine News

Wednesday, April 23, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Big Pharma Braces for M&A Wave

Big Pharma Braces for M&A Wave

Reuters - Business Video Online (Apr. 22, 2014) Big pharma on the move as Novartis boss, Joe Jimenez, tells Reuters about plans to transform his company via an asset exchange with GSK, and Astra Zeneca shares surge on speculation that Pfizer is looking for a takeover. Joanna Partridge reports. Video provided by Reuters
Powered by NewsLook.com
Study Says Most Crime Not Linked To Mental Illness

Study Says Most Crime Not Linked To Mental Illness

Newsy (Apr. 22, 2014) A new study finds most crimes committed by people with mental illness are not caused by symptoms of their illness or disorder. Video provided by Newsy
Powered by NewsLook.com
Hagel Gets Preview of New High-Tech Projects

Hagel Gets Preview of New High-Tech Projects

AP (Apr. 22, 2014) Defense Secretary Chuck Hagel is given hands-on demonstrations Tuesday of some of the newest research from DARPA _ the military's Defense Advanced Research Projects Agency program. (April 22) Video provided by AP
Powered by NewsLook.com
How Smaller Plates And Cutlery Could Make You Feel Fuller

How Smaller Plates And Cutlery Could Make You Feel Fuller

Newsy (Apr. 22, 2014) NBC's "Today" conducted an experiment to see if changing the size of plates and utensils affects the amount individuals eat. 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