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updated 6/3/2013 9:47:40 PM ET 2013-06-04T01:47:40

A type of brain surgery appears to be a relatively effective treatment for people with severe obsessive compulsive disorder (OCD) who have not responded to other treatments, a new study suggests.

In the study, nearly half of patients showed at least some improvement in their OCD symptoms, and 15 percent fully recovered seven years after the surgery.

The findings suggest surgery may be an effective treatment for patients with very severe OCD who have not been helped by other therapies, the researchers said. Patients in the study had not responded to several medications, including serotonin reuptake inhibitors (SRIs) and antipsychotic medications, as well as psychotherapy. On average, patients had experienced symptoms for 16 years, and one-third had attempted suicide.

However, the surgery has significant risks. Two of the 19 patients experienced permanent complications from the surgery, including paralysis on one side of the body and cognitive impairment. Because of this, the procedure should be considered with caution, the researchers said. [See 5 Controversial Mental Health Treatments ].

Future studies should examine which patients are most likely to be helped by the surgery, so that only those who stand to gain greatest benefit undergo the procedure, the researchers said.

Some experts said that the procedure used in the study was dated, and that newer technologies, such as deep brain stimulation, show more promise as alternative treatments for OCD.

Surgery for OCD

OCD is characterized by recurrent, intrusive thoughts and repetitive behaviors that patients feel compelled to carry out. Patients might perform these behaviors (such as hand washing) for hours, and some are unable to leave their homes. About 20 to 30 percent of patients are not helped by medication or behavioral therapies.

Brain surgery for mental disorders, called psychosurgery, has been practiced since the 1930s, although it is very controversial. Early surgeries, such as lobotomies practiced in the 1940s and 1950s, had serious side effects, including personality changes.

The practice of psychosurgery declined after psychiatric medications became available, although a small number of medical centers continue perform psychosurgerical procedures. Today, psychosurgery is much more carefully regulated than it was in the past, and performed only after patients are determined to be appropriate candidates for the treatment by a team of psychiatrists and neurologists, said Dr. Michael Schulder, vice chair of neurosurgery at North Shore University Hospital in Manhasset, N.Y.

Brain imaging technology available today helps doctors more carefully select the surgery target, said Schulder, who was not invovled in the new study.

The study, conducted by researcher at Université Laval in Quebec, Canada, involved 19 patients who underwent a type of psychosurgery called bilateral capsulotomy between 1997 and 2009. The surgery damages tissue (by creating lesions) in a part of the brain called the internal capsule.

Before the surgery, patients scored an average of 34 out of 40 points (extreme OCD) on a test designed to measure the severity of the condition.

After surgery, the average score decreased to 23, which is considered moderate OCD.

About 37 percent of patients responded fully to the surgery, meaning their score improved by at least 35 percent, and about 10 percent partially responded to the surgery, meaning their score improved by 25 percent.

After seven years, three patients fully recovered from OCD, and three had minimal symptoms, the researchers said.

Those who did not respond to the capsulotomy surgery were more likely to have had OCD for a longer time (an average of 20 years) than those who did respond to surgery (an average of 12 years).

Lesioning or deep brain stimulation?

The study did not have a control group, or a group of patients who did not undergo the procedure, so it's possible the improvement seen in the study was the result of a placebo effect. However, there is little evidence for spontaneous remission or placebo effect in patients with severe OCD, the researchers said.

A more recent surgical procedure for OCD, called deep brain stimulation, involves implanting a device that sends electrical impulses into the brain. Unlike the capsulotomy surgery, deep brain stimulation is reversible, and does not permanently damage tissue. In 2009, the Food and Drug Administration approved the use of deep brain stimulation for OCD.

However, patients with a deep brain stimulation implant may experience problems with the implant that need to be fixed right away, so they should live close to a health care center.

Bilateral capsulotomy is less expensive than deep brain stimulation, and does not require that patients live close to a health care center, so there is still a place for the procedure in the field, the researchers said.

Schulder said that while capsulotomy surgery tends to have a higher complication rate than DBS, the latter procedure poses risks such as infection and erosion of the device through the skin. "There's still a good rationale," for doing the capsulotomy surgery in some patients, he said. "It's not like DBS is complication free."

Other experts argued that DBS was a more promising technology.

"It's as good, if not better [than capsulotomy], and not destructive" of brain tissue, said Dr. Joseph Fins, a professor of medical ethics and medicine at Weill Cornell Medical College in New York. "The fact that a paper like this could be published, it's like we're still reporting on yetserday's technology," Fins said. 

The study is published today (June 3) in the Journal of Neurology, Neurosurgery, & Psychiatry.

Follow Rachael Rettner@RachaelRettner. Follow MyHealthNewsDaily@MyHealth_MHND,Facebook&Google+. Originally published on LiveScience.

© 2012 LiveScience.com. All rights reserved.

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