Dear Jan -

The only reason for my inquiry is that there is in fact evidence in the literature as to when and how there is a positive response to ECT, in terms of pain levels, and it is frequently progressive over time:

There was a progressive lessening of pain over the course of ECT treatment. A course of 8 bilateral ECT treatments resulted in a dramatic reduction in pain.

"Case Reports: Chronic Pain With Beneficial Response to Electroconvulsive Therapy and Regional Cerebral Blood Flow Changes Assessed by Single Photon Emission Computed Tomography," Sei Fukui, M.D., Ph.D., Shino Shigemori, M.D., Atsushi Yoshimura, M.D., and Shuichi Nosaka, M.D., Ph.D., Regional Anesthesia and Pain Medicine, Vol 27, No 2 (March–April), 2002: pp 211–213 at 212; "Electroconvulsive Therapy in Complex Regional Pain Syndromes," William W. McDaniel, MD, J ECT 2003;19:226–229 (reporting on one of three participants in ECT treatments for pain co-morbid with major depressive episodes):

Her right arm had been injured in a motor vehicle accident 5 years earlier, and although the multiple fractures had healed, she developed severe CRPS and her dominant right hand was crippled by joint contractures. She listed the pain and disability as the most important stressors contributing to the depression. She was hospitalized with suicide precautions. Her ineffective antidepressant medications were discontinued. She was treated with a series of 12 treatments of ECT with bitemporal electrode placement under anesthesia with methohexital 80 mg and succinylcholine 80 mg. Her ECT was performed using the MECTA SR-1 using a dose titration protocol with the dose set just above the seizure threshold. The treatments were well tolerated, and she demonstrated improvement in mood beginning by about the third treatment. Her immobile right hand began to move after the fifth treatment, and physical therapy was initiated. By the 10th treatment, the pain, stiffness, discoloration, and coldness had resolved. By the 12th treatment, the remission in her depressive symptoms seemed stable, with normal sleep, appetite, and concentration, and treatments were discontinued.

Finally, in their 1993 study:

King and Nuss reported the case of a 32-year-old woman status post left arm injury and arthroscopic repair of ligament damage. She subsequently developed reflex sympathetic dystrophy of the left arm characterized by weakness, piloerection, swelling, decreased range of motion, discoloration, hyperesthesia, and disability from work and sports activities. She became depressed and was admitted to a psychiatric unit. Behavioral pain management approaches, antidepressant medication, and stellate ganglion block did not help, and after a suicide attempt, ECT was commenced. For 12 hours after the first treatment, the arm was normal in function, pain free, and not discolored. Over the course of the next seven treatments, the period of improvement steadily increased. On 6-month follow-up, the patient’s arm remained normal in function and without the objective physical stigmata of reflex sympathetic dystrophy. [Emphasis added.]

"Reflex sympathetic dystrophy treated by electroconvulsive therapy: intractable pain, depression, and bilateral electrode ECT," King JH, Nuss S: . Pain 1993, 55:393–396, as cited in "Electroconvulsive Therapy in the Management of Chronic Pain," Rasmussen KG and Rummans TA, Current Pain and Headache Reports 2002 6:17-22 at 20.

I share these for whatever they are worth and, as always, would be happy to email copies of the articles to anyone who's interested.

Mike