Low Amplitude Pulse Seizure Therapy Versus Standard Ultra-Brief Right Unilateral Electroconvulsive Therapy

Suicide is one of the leading causes of mortality. Suicidal Ideation (SI) is a precursor to suicide. SI is especially hard to treat/remit in those with treatment-resistant psychiatric disorders (TRPD). This includes treatment-resistant mood disorders and psychotic disorders (such as schizophrenia and schizoaffective disorders). The above TRPD and the SI can remit with Electroconvulsive Therapy (ECT). That is to say, a transdiagnostic, evidence-based treatment for those patients, in addition to pharmacotherapy and psychotherapy, is ECT. ECT has both research support (mainly secondary analysis) and clinical evidence of a beneficial effect in remission of suicidality, as well as unsurpassed effect in treating primary mood and psychotic disorders including those who are treatment-resistant to other therapeutics. However, there are undeniable barriers to treatment with ECT. The most important barrier is memory side effects. ECT can help SI. ECT has also been shown to improve quality of life in a randomized trial by our group, which studied elderly patients with depression. Treating SI, along with the underlying disorder, especially in patients with TRPD is crucial in real-world patients who are clinically referred for ECT. These real-world referrals to ECT (by the patients' primary psychiatrist) will constitute the recruitment pool for this study. Current amplitude drives electric fields to the deeper structures that are concerned with memory (Peterchev et al., 2010). Previously, the investigators performed the first in human proof of concept one arm open label clinical trial of LAP-ST, (N=22); followed by another small (N=7) pilot randomized, double-blinded clinical trial for the feasibility, safely and initial efficacy of LAP-ST, and another group later confirmed the more favorable cognitive side effects of LAP-ST compared to higher current amplitude (800mA). However, efficacy of LAP-ST against suicidality has not been well established as primary outcome previously. Thus, this protocol proposes an initial randomized clinical trial that includes all patients with SI at baseline, and with SI as the primary outcome measure to examine whether RUL LAP-ST treatment has more magnitude and rate of remission of SI as conventional pulse amplitude RUL ECT (based on our prior secondary analysis). Our central hypothesis is that RUL LAP-ST has significantly less cognitive/memory side effects (no memory side effects were noted in our prior studies for 500mA or 600mA) and thus is more favorable in terms of side effects compared to RUL conventional pulse amplitude ECT, while maintaining better anti-suicidal effect.