Featured Research

from universities, journals, and other organizations

Mechanomyography to be accurate in detecting nerves during minimally invasive spine surgery, study suggests

Date:
May 2, 2010
Source:
Henry Ford Health System
Summary:
An electronic device is an accurate technique for locating and avoiding nerves during spinal procedures, a new study suggests. The issue becomes important for patients as the demand for minimally invasive surgical techniques continues to grow, so does the need for effective methods for monitoring the location of nerves during surgery to avoid damage to them.

An electronic device is an accurate technique for locating and avoiding nerves during spinal procedures, suggests a study by Henry Ford Hospital researchers.

The issue becomes important for patients as the demand for minimally invasive surgical techniques continues to grow, so does the need for effective methods for monitoring the location of nerves during surgery to avoid damage to them.

Mechanomyography (MMG) systems function by measuring the mechanical response of muscle following nerve stimulation, compared to traditional techniques that monitor the electrical response of muscle using electromyography (EMG). EMG systems are widely used as intraoperative tools to help surgeons avoid nerve injury. MMG has been widely used in laboratory settings to study things such as muscle fatigue, however up until now it has not been applied as an intraoperative tool for locating nerves.

"We felt there was a safer and faster way to intra-operatively monitor the location of nerves and we wanted to test this theory by directly comparing MMG to EMG," says Stephen Bartol, MD, orthopedic spine surgeon at Henry Ford Hospital. "We found MMG to be extremely effective for detecting the presence of nerves during minimally invasive surgical procedures when the nerves could not be directly visualized."

Dr. Bartol presented results from the study at the Tenth Annual Scientific Conference of the Canadian Spine Society in Alberta.

According to the National Institutes of Health, in a three-month period, about one-fourth of U.S. adults experience at least one day of back pain. It is one of the most common medical issues affecting Americans.

During minimally invasive spine surgery, a common treatment for chronic back pain, a small electrical signal is sometimes used to stimulate nerves and detect responses so that nerves are not damaged during surgery.

"Because conventional EMG systems monitor for subtle changes in muscle electrical activity, there is the potential for electrical interference. By using an MMG system, we are not worried about electrical interference since the response to electrical stimulation is measured through mechanical sensors instead," says Dr. Bartol.

In an animal model, Dr. Bartol and his colleagues measured the EMG and MMG responses to electrical current.

"We found that the MMG system had a faster response, indicating a higher sensitivity for detection of nerves at a lower threshold," says Dr. Bartol.

In another study, also presented at the conference, Dr. Bartol took a look at how the muscle response to electrical stimulus varies with the distance of the nerve from the source of the stimulus.

"We need to know exactly how far away we are from the nerve. Working with different levels of current, we were able to establish a relationship between the current and distance, allowing the surgeon to determine precisely how far a nerve is from the stimulus probe," says Dr. Bartol.

They found MMG detected the presence of a nerve on average 1.2 seconds earlier than EMG, using approximately half the amount of stimulating current. Since electrical resistance is highly variable, depending on the conducting tissue, EMG monitoring systems may utilize currents as high as 200 mA. The MMG system in this study has a maximum current output of 6 mA, nearly 35 times less than comparable EMG systems.

"We found mechanomyography to be a more sensitive indicator for locating nerves," says Dr. Bartol. "We can, without looking, know within a millimeter or two where we are in relation to the nerve. By utilizing a system that requires less electrical current, we may be able to further decrease the risk of injury to our patients."

Dr. Bartol explains that further investigation is needed in human trials.

Industry funding for both studies was received from Innovative Surgical Solutions, LLC, based in Royal Oak, MI.


Story Source:

The above story is based on materials provided by Henry Ford Health System. Note: Materials may be edited for content and length.


Cite This Page:

Henry Ford Health System. "Mechanomyography to be accurate in detecting nerves during minimally invasive spine surgery, study suggests." ScienceDaily. ScienceDaily, 2 May 2010. <www.sciencedaily.com/releases/2010/03/100315125651.htm>.
Henry Ford Health System. (2010, May 2). Mechanomyography to be accurate in detecting nerves during minimally invasive spine surgery, study suggests. ScienceDaily. Retrieved September 19, 2014 from www.sciencedaily.com/releases/2010/03/100315125651.htm
Henry Ford Health System. "Mechanomyography to be accurate in detecting nerves during minimally invasive spine surgery, study suggests." ScienceDaily. www.sciencedaily.com/releases/2010/03/100315125651.htm (accessed September 19, 2014).

Share This



More Health & Medicine News

Friday, September 19, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Could Grief Affect The Immune Systems Of Senior Citizens?

Could Grief Affect The Immune Systems Of Senior Citizens?

Newsy (Sep. 19, 2014) The study found elderly people are much more likely to become susceptible to infection than younger adults going though a similar situation. Video provided by Newsy
Powered by NewsLook.com
Jury Delivers Verdict in Salmonella Trial

Jury Delivers Verdict in Salmonella Trial

AP (Sep. 19, 2014) A federal jury has convicted three people in connection with an outbreak of salmonella poisoning five years ago that sickened hundreds of people and was linked to a number of deaths. (Sept. 19) Video provided by AP
Powered by NewsLook.com
How The 'Angelina Jolie Effect' Increased Cancer Screenings

How The 'Angelina Jolie Effect' Increased Cancer Screenings

Newsy (Sep. 19, 2014) Angelina's Jolie's decision to undergo a preventative mastectomy in 2013 inspired many women to seek early screenings for the disease. Video provided by Newsy
Powered by NewsLook.com
The Cost of Ebola

The Cost of Ebola

Reuters - Business Video Online (Sep. 18, 2014) As Sierra Leone prepares for a three-day "lockdown" in its latest bid to stem the spread of Ebola, Ciara Lee looks at the financial implications of fighting the largest ever outbreak of the disease. Video provided by Reuters
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