In a small preliminary study of 18 patients with treatment-resistant depression given esketamine nasal spray for one month, those who responded to treatment (44.5% of the sample, defined by at least a 30% reduction in depression scores) had lower heart rate variability at baseline compared to non-responders. After one month of treatment, responders' heart rate variability increased. Baseline heart rate variability showed potential to discriminate between responders and non-responders. The findings suggest a link between esketamine treatment and changes in autonomic function measured by heart rate variability, but larger studies are needed to confirm heart rate variability as a predictor of treatment response.
People with anorexia nervosa-restrictive subtype experience more anomalous self-experiences (ASEs), such as a disturbed sense of self, than healthy controls. These ASEs directly contribute to eating disorder severity, and this relationship is partly explained by an abnormal body image attitude. The findings suggest that a disturbed self-experience may underlie both body image distortions and eating disorder symptoms in this condition, pointing to the need for broader exploration of self-disorder as a transdiagnostic feature.