Navigation Links
Precise brain mapping can improve response to deep brain stimulation in depression
Date:4/28/2014

Experimental studies have shown that deep brain stimulation (DBS) within the subcallosal cingulate (SCC) white matter of the brain is an effective treatment for many patients with treatment-resistant depression. Response rates are between 41 percent and 64 percent across published studies to date.

One of the proposed mechanisms of action is the modulation of a network of brain regions connected to the SCC. Identifying the critical connections within this network for successful antidepressant response is an important next step.

A new study using MRI analysis of the white matter connections examined the architecture of this network in patients who demonstrated significant response to SCC DBS. Researchers found that all responders showed a common pattern defined by three distinct white matter bundles passing through the SCC. Non-responders did not show this pattern.

The study is published online in the journal Biological Psychiatry, with the title "Defining Critical White Matter Pathways Mediating Successful Subcallosal Cingulate Deep Brain Stimulation for Treatment-Resistant Depression."

"This study shows that successful DBS therapy is not due solely to local changes at the site of stimulation but also in those regions in direct communication with the SCC," says Helen Mayberg, MD, senior author of the article, professor of psychiatry, neurology and radiology and the Dorothy C. Fuqua Chair in Psychiatric Imaging and Therapeutics at Emory University School of Medicine.

"Precisely delineating these white matter connections appears to be very important to a successful outcome with this procedure. From a practical point of view, these results may help us to choose the optimal contact for stimulation and eventually to better plan the surgical placement of the DBS electrodes."

Led by researchers at Emory University, Case Western Reserve University and Dartmouth University, the study included 16 patients with treatment-resistant depression who previously received SCC DBS at Emory. Computerized tomography was used post-operatively to localize the DBS contacts on each electrode. The activation volumes around the active contacts were modeled for each patient. Sophisticated neuroimaging combined with computerized analysis was used to derive and visualize the specific white matter fibers affected by ongoing DBS.

Therapeutic outcome was evaluated at six months and at two years. Six of the patients had responded positively to DBS at six months, and by two years these six plus six more patients responded positively. All shared common involvement of three distinct white matter bundles: the cingulum, the forceps minor and the uncinate fasciculus.

The conversion of six of the patients who were not responding at six months to being responders at two years was explained by the inclusion of all three bundles due to changes in stimulation settings. Non-responders at both six months and two years showed incomplete involvement of these three tracts.

"In the past, placement of the electrode relied solely on anatomical landmarks with contact selection and stimulation parameter changes based on a trial-and-error method," says Patricio Riva-Posse, MD, Emory assistant professor of psychiatry and behavioral sciences and first author of the paper. "These results suggest that clinical outcome can be significantly influenced by optimally modulating the response network defined by tractography. This obviously will need to be tested prospectively in additional subjects here and by other teams exploring the use of this experimental treatment."

This new information will allow us to develop a refined algorithm for guiding surgical implantation of electrodes and optimizing the response through fine tuning of stimulation parameters," notes Mayberg. "That said, improving anatomical precision alone doesn't account for all non-responders, so that is an important next focus of our research."

The researchers now plan to study DBS therapy in a prospective protocol of similar treatment-resistant depressed patients, using presurgical mapping of an individual patient's network structure, precisely targeting the three SCC fiber bundles, and systematically testing the stimulation contacts.


'/>"/>
Contact: Robin Reese
404-727-9371
Emory Health Sciences
Source:Eurekalert

Related medicine news :

1. Precise and persistent cell sabotage
2. New technology makes breast cancer surgery more precise at UC Irvine
3. Monroe, CT Dental Implants Are Now Computer Guided from Dr. Richard Amato for Precise Results
4. Precise Care is First Practice in Orange County to Offer SPG Block
5. Atlantic Spine Center Chief Surgeon, Dr. Kaixuan Liu, MD, PhD, Discusses the Evolution of Back Pain Treatment through More Precise Methods of Diagnostics
6. Cone Beam Imaging Technology is Now Used by Dr. Robert Mokbel for Precise Placement of Dental Implants in Fountain Valley, CA
7. Estimating babys size gets more precise
8. Study Suggests Vaccine May Help Kids With Brain Cancer
9. Epilepsy Leads to More Brain Abnormalities Over Time
10. UCLA Brain Injury Research Center gets NCAA funding for research on sports concussions
11. Why is traumatic brain injury increasing among the elderly?
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:10/12/2017)... ... October 12, 2017 , ... Leading pediatric oncology experts at Children’s National ... 49th Congress of the International Society of Paediatric Oncology (SIOP) Oct. 12-15. ... for Cancer and Blood Disorders at Children’s National, and Stephen P. Hunger, M.D., ...
(Date:10/12/2017)... ... October 12, 2017 , ... ... one of Michigan’s 2017 Best and Brightest in Wellness® by Best and Brightest. ... awards program on Friday, Oct. 20 from 7:30 a.m. to 2 p.m. at ...
(Date:10/12/2017)... ... October 12, 2017 , ... In the United ... year. In some states—like New York, New Jersey, Massachusetts, Texas, Virginia, Connecticut, and ... havens have extremely low property-tax rates, which contributes to the relatively lower cost ...
(Date:10/12/2017)... , ... October 12, 2017 , ... ... at the University of California Berkeley, and other leading institutions in announcing the ... power of institutions to change the way animals are raised for food. , ...
(Date:10/12/2017)... San Antonio, Texas (PRWEB) , ... October 12, ... ... medical device and biologics manufacturer, has expanded its executive staff with the addition ... Development. , In this role, Slott will develop the national distribution and sales ...
Breaking Medicine News(10 mins):
(Date:10/7/2017)... IRVING, Texas , Oct. 6, 2017   ... industry with more than $100 billion in purchasing power, ... industry news and information. The Newsroom is ... chain and industry trends, infographics, expert bios, news releases, ... Besides having access to a wealth of resources at ...
(Date:10/4/2017)... Centers for Disease Control and Prevention (CDC), influenza vaccination should take ... communities across Massachusetts , Connecticut , ... through the end of the month. *Some exclusions apply ... ... by the end of October, according to the Centers for Disease Control ...
(Date:10/2/2017)... , Oct. 2, 2017  Eli Lilly and Company ... results for the third quarter of 2017 on Tuesday, ... call on that day with the investment community and ... The conference call will begin at 9 a.m. ... access a live webcast of the conference call through ...
Breaking Medicine Technology: