There are no government backed studies or anything that you can point to. The only percentages of this particular subject come from less than a handful of doctors who actually give this to the worst rsd patients out there, of which the one article states has been only 26 people in Germany for the coma treatment.There are no medical studies or articles in medical journals that have any stats because there are none.
Low doses of a common intravenous anesthetic may relieve debilitating pain syndrome
Harbut R MD
23 Sep 2004
Limited, low-dose infusions of a widely used anesthetic drug may relieve the often intolerable and debilitating pain of Complex Regional Pain Syndrome (CRPS), a Penn State Milton S. Hershey Medical Center researcher found.
"This pain disorder is very difficult to treat. Currently-available therapies, at best, oftentimes only make the pain bearable for many CRPS sufferers," said Ronald E. Harbut, M.D., Ph.D., assistant professor of anesthesiology, Penn State Hershey Medical Center. "In our retrospective study, some patients who underwent a low-dose infusion of ketamine experienced complete relief from their pain, suggesting that this therapy may be an option for some patients with intolerable CRPS."
The study, titled "Subanesthetic Ketamine Infusion Therapy: A Retrospective Analysis of a Novel Therapeutic Approach to Complex Regional Pain Syndrome," was published in the September 2004 issue of Pain Medicine, the official journal of the American Academy of Pain Medicine.
CRPS (type I), also known as Reflex Sympathetic Dystrophy Syndrome (RSD), affects between 1.5 million and 7 million people in the United States and is oftentimes marked by a severe, burning pain that can be very resistant to conventional therapies. The pain frequently begins after a fall or sprain, a fracture, infections, surgery, or trauma. Often present in the limbs with possible later spreading to other parts of the body, patients also may experience skin color changes, sweating abnormalities, tissue swelling, and an extreme sensitivity to light touch or vibrations. The McGill Pain Index rates CRPS as 42 on the scale of 50, with 50 being most severe.
Although much is unknown about CRPS, the pain experienced by patients appears to be caused by over-stimulation of a nerve receptor complex involved in the process of feeling pain. Therefore, efforts have been made to treat CRPS by blocking these receptors. Whereas most pain medications do not effectively block these receptor complexes (often referred to as NMDA-receptors), ketamine does.
The study was initiated by Graeme E. Correll, B.E., M.B.B.S., and involved reviewing the medical records of 33 patients with CRPS treated by Correll. The patients, some of whom had failed to obtain pain relief from conventional therapies, were treated with low-dose inpatient intravenous infusions of ketamine between 1996 and 2002 in Mackay, Queensland, Australia. Ketamine infusions were started at very low rates and were slowly increased in small increments as tolerated by selected patients. The therapy was then continued as long as the patient tolerated the drug and continued to benefit from it. Treatment cycles generally continued until the patient experienced complete pain relief; until initially-obtained relief would not improve any further; or for no more than 48 hours if there was no improvement in pain severity.
Pain was completely relieved for 25 (76 percent) patients, partially relieved for six (18 percent) patients, and not relieved for two (6 percent) patients. Although the relief obtained did not last indefinitely, 54 percent remained completely pain-free for three months or more and 31 percent for six months or more. For 12 patients who received a second treatment, 58 percent experienced relief for one year or more with 33 percent remaining pain-free for more than three years.
The most frequent side effect reported was a feeling of inebriation. Hallucinations occurred in six patients with less frequent side effects including complaints of light-headedness, dizziness and nausea. Liver enzymes were altered in four patients but resolved after therapy.
The exact mechanism of sustained pain relief is unknown, but is currently under study at Penn State Hershey Medical Center. Harbut likened the ketamine treatment to the healing of a broken bone. "If someone breaks a bone and you simply put the two pieces back together, they won't immediately heal. However, if you add a splint and hold the bones steady for a period of time, and then later take away the splint the bone is healed. I believe that the ketamine treatment does something similar that lends support and allows the nerve cells to heal themselves, so that when you take away the ketamine, the pain is reduced or gone."
Harbut began studying CRPS with Correll during a work assignment Harbut volunteered to take in far northern Queensland, Australia, in the late 1990s. Correll was developing a therapy for CRPS but wanted a collaborator to formally research the effectiveness of the therapy. Harbut brought Correll's method back to the U.S. where he developed an FDA-approved study protocol (used at the Mayo Clinic Scottsdale) using this method to attempt to treat post herpetic neuralgia, another pain disorder with symptoms somewhat similar to CRPS. At the same time, Harbut met a patient who had suffered with intolerable CRPS for nine years who wanted to try this new therapy. That patient became the first successful treatment of intractable CRPS in the U.S. (A Case Report of this treatment appeared in the June 2002 issue of Pain Medicine.)
"Ultimately, we want to find a way to improve the quality of life for those who suffer with intolerable CRPS, some of whom at times contemplate suicide because of their endless pain," Harbut said. "Although optimistic about these early findings, certainly more study is needed to further establish the safety and efficacy of this novel approach." (A large clinical study is currently planned and under development at Penn State Hershey Medical Center.)
In addition to Harbut and Correll, the team involved in this study included: Jahangir Maleki, M.D., Ph.D., and Edward J. Gracely, Ph.D., Drexel University College of Medicine; and Jesse J. Muir, M.D., Mayo Clinic Scottsdale.
Article found here :
http://www.rsdcanada.org/parc/englis...udies2003.html
http://home.comcast.net/~fightrsdwithlisa/articles.html
Quote from the above article: The earlier the condition is treated, the more effective it seems to be - but there is no cure and no one treatment works universally, experts say. The ketamine coma is only for the most serious cases. A number of U.S. doctors use ketamine in small doses to treat pain while patients are awake, but Schwartzman and two German colleagues, Ralph-Thomas Kiefer and Peter Rohr, are the first to infuse it in comatose patients for up to seven days. So far, the trio has treated 26 American patients in Germany. All patients received significant temporary pain relief, and nine remain completely pain-free from nine months to three years after the infusion.
Ketamine is FDA-approved in the United States for two-day use when the patient is awake, but Schwartzman holds out little hope that the coma procedure will ever be allowed here. At Hahnemann University Hospital in Philadelphia, Schwartzman studies ketamine use for less severe patients and as boosters for those who have returned from Germany.
He just finished a study of 50 patients who were awake during five days of ketamine use - also not enough, he said - and plans to go back to the FDA in a couple of months for approval to try 10-day outpatient infusions. It may seem strange for a mind-altering substance to be used medically, but the history of ketamine is like many other drugs - if it works for one thing, scientists say, let's see if it works for another.
http://www.rsdhope.org/Showpage.asp?...2&PGCT_ID=3905
and continues to part 2 as well.
http://www.rsds.org/3/treatment/ketamine.html