LAS VEGAS – How do you know when a patient is a candidate for electroconvulsive therapy (ECT)?
In the opinion of Mark S. George, MD, it depends on the level of treatment resistance, other treatments the person may be receiving for severe depression or bipolar disorder, and the level of acuity.
Dr. Mark S. George
“Acute ECT is also useful for catatonia that does not resolve with benzodiazepines, and it also works well for acute suicidality,” Dr. George, distinguished professor of psychiatry, radiology, and neurology at the Medical University of South Carolina, Charleston, said during an annual psychopharmacology update held by the Nevada Psychiatric Association. “The other reason you would go straight to ECT would be if someone has had good prior ECT response.”
It is lifesaving. Some studies suggests that ECT is effective in Parkinson’s disease and schizophrenia. Antidepressant effects generally take 2-3 weeks, but quicker responses are sometimes seen, especially in patients with bipolar depression.”
In the past 20 years of research studies involving ECT, investigators have discovered that a generalized seizure of adequate duration is necessary for adequate antidepressant effects; reduced therapeutic effects are seen with parietal placement, meaning that proper scalp placement matters; a dose titration over the 12 treatments improves efficacy, and smaller pulse widths are more effective and may result in fewer toxic side effects. “ECT is still relatively spatially crude compared with the other brain stimulation treatments,” said Dr. George, editor-in-chief of Brain Stimulation. “It’s also invasive, requiring repeated anesthesia, and sometimes has possible side effects including impacts on short-term memory.”
An emerging adjunct to ECT is cervical invasive vagus nerve stimulation (VNS) therapy, in which mild electrical pulses applied to the left vagus nerve in the neck send signals to the brain. “Surgeons wrap a wire around the vagus nerve and connect the wire to a generator which is embedded in the chest wall,” Dr. George explained. “The generator sends out a signal through the vagus nerve intermittently. You can program how it does that.”
A device from LivaNova known as the VNS Pulse Model 102 Generator was granted clearance for depression based on a comparative study, but in the absence of class I evidence. The generator is about the size of a quarter, is embedded under the skin, and its battery lasts for 8-10 years. “Patients are given a static magnet to use to turn the device off if they’re having side effects, as a safety precaution,” said Dr. George, a staff physician at the Ralph H. Johnson VA Medical Center in Charleston. “The side effects are mainly stimulation-based and typically decrease over time. There is a low rate of treatment discontinuation and no signal for treatment-related emergence of suicidal ideation/behavior. Sometimes you can get emergent mania or hypermania, but it’s rare. It’s pretty safe, but the insurance companies have been very slow to pay. You only get about 30% remission, this takes several months to years to achieve, and there’s no way to tell who’s going to respond before you place the device.”
However, results from a 5-year observational study of patients with treatment-resistant depression who were treated at 61 sites with VNS or treatment as usual found that the antidepressant effects built over time compared with treatment as usual (Am J Psychiatry 2017;174[7]:640-8). “There is remarkable durability but it’s not very fast,” he said. “It’s three months before you start seeing any differences.”
According to Dr. George, data from an informal registry of Medicare patients who received VNS treatment “did so much better” than untreated patients. “They didn’t need as much ECT and didn’t require as many hospitalizations,” he said. “They weren’t changing medications nearly as much. They found that VNS was saving money and saving people’s lives.” As a result, in September of 2019 LivaNova launched a prospective, multicenter, randomized, controlled, blinded trial of subjects implanted with VNS therapy, called RECOVER. Active treatment and no stimulation control are randomized at least 2 weeks after implantation and observed for 12 months. The study is ongoing with results expected in 2022 or 2023.
Dr. George disclosed that he is a paid consultant for Neurolief, Microtransponder, and Sooma and that he has been a paid consultant for GSK, Cyberonics, NeuroPace, and Jazz. He is an unpaid consultant to Brainsway, Neuronetics, Neostim, Neosync, and Magnus Medical.