The document discusses medication resistance and its influence on response to electroconvulsive therapy (ECT). It presents findings from several studies that have investigated whether higher levels of medication resistance, as measured by scales like the Antidepressant Treatment History Form (ATHF), impact how well patients respond to ECT. The studies presented found no significant influence of medication resistance on remission rates or response to ECT. Specifically, two studies from 1990 and 1996 found similar response rates to ECT among patients regardless of their level of medication resistance prior to receiving ECT.