Clinical Response to Electroconvulsive Therapy in a Young Adult With Down Syndrome Regression Disorder.

Down syndrome regression disorder (DSRD) is a condition in which individuals with Down syndrome experience a decline in social and adaptive functioning in adolescence to early adulthood. Initially described as catatonic psychosis and later designated Down syndrome disintegrative disorder (DSDD), the etiology for DSRD remains unclear but has been hypothesized to relate to autoimmune function, stress, and psychiatric disease. DSRD presents heterogeneously and has no clearly established diagnostic criteria, which can complicate treatment recommendations. ECT has been used to successfully treat DSRD, but the number of reported cases remains low, especially when it is unclear whether there are comorbid catatonic features. Here, we present a case of successful use of ECT in an individual with DSRD in which catatonic features were difficult to ascertain, and we make recommendations for the use of ECT in the treatment of DSRD.