Focal Electroconvulsive Therapy for Depression

This study will provide preliminary evaluation of the following: 1. Determination of whether focal seizures can be induced with the FEAST methodology (unidirectional stimulation, small anterior and large posterior electrode). 1. Focality will be assessed by the occurrence of non-motor seizures. 2. Electroencephalographic evidence of pronounced asymmetry in frontal leads. 2. Determination of whether the FEAST methodology results in reduced seizure threshold. a. Seizure threshold will be quantified at the start of the treatment course using the standard method of limits titration procedure and compared to threshold determinations in matched patients who were treated with conventional ECT methods. 3. Characterization of dynamic impedance using the FEAST methodology. a. Dynamic impedance during the passage of the electrical stimulus will be quantified during each administration and compared to the values obtained in matched patients who were treated with conventional ECT methods. 4. Characterization of the efficacy of the FEAST methods and the safety of the treatment. 1. The primary efficacy measure will be the 24-item Hamilton Rating Scale for Depression. The changes in these scores from before to immediately following the treatment course will be compared in patients treated with the FEAST methodology and matched patients who were treated with conventional ECT methods. 2. Acute, subacute, and long-term cognitive side effects following FEAST will be assessed with comprehensive neuropsychological batteries. The primary acute measures will include the time to return of orientation following seizure induction and retrograde amnesia for words and shapes. The primary subacute measures will include assessments of anterograde amnesia (forgetting over a delay) for a verbal list and for reproduction of a complex figure, as well as retrograde amnesia for autobiographical information. The primary long-term measure will be retrograde amnesia for autobiographical information, assessed 6-months following the FEAST course. The neuropsychological measures will be compared in the patients treated with the FEAST methodology and matched patients who were treated with conventional ECT methods, as well as in healthy participants who receive were administered the neuropsychological battery at the same intervals as the FEAST patients, but without Intervention. 3. Safety will also be determined by examining the number and frequency of serious adverse advents and adverse events, as well as scores on the Columbia University ECT Side Effect Scale.