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Study offers clues as to why some patients get infections from cardiac implants
Date:10/24/2011

COLUMBUS, Ohio New research suggests that some patients develop a potentially deadly blood infection from their implanted cardiac devices because bacterial cells in their bodies have gene mutations that allow them to stick to the devices.

Patients with implants can develop infections because of a biofilm of persistent bacterial bugs on the surfaces of their devices. Researchers found that some strains of the bacteria, Staphylococcus aureus, have just a few genetic variants in the proteins on their surfaces that make them more likely to form these biofilms.

The research seeks to get to the heart of a medical paradox: Devices such as pacemakers, defibrillators and prosthetic cardiac valves save lives, but they cause infections in about 4 percent of the estimated 1 million patients receiving implants each year in the United States. Because biofilms resist antibiotics, the only treatment is surgery to remove the contaminated device and implant a new one. This adds up to thousands of surgeries and more than $1 billion in health care costs every year.

A team led by scientists at Ohio State University and Duke University Medical Center used atomic-force microscopy and powerful computer simulations to determine how Staph bacteria bond to the devices in the process of forming these biofilms. The findings offer clues about potential techniques that could be employed to prevent infections in patients who need these devices to stay alive.

"We're probing the initial step to that biofilm formation. Can you shut that down somehow? If that bacterium never sticks, there's no biofilm. It's that simple. But it's not quite that simple in practice," said Steven Lower, associate professor in the School of Earth Sciences at Ohio State and co-lead author of the study.

The research is published online this week in the early edition of the Proceedings of the National Academy of Sciences.

Using Staph cells collected fr
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Contact: Steven Lower
lower.9@osu.edu
614-292-1571
Ohio State University
Source:Eurekalert  

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