Journal of Affective Disorders
June 12, 2025
David Williamson, Linda Williamson, Viola Vaccarino et al.
2 citations
Dissociative symptoms are commonly observed in a substantial minority of patients with Post-Traumatic Stress Disorder (PTSD) and during the first administration of esketamine for the treatment of Treatment-Resistant Depression (TRD). We examine differences in the number and pattern of dissociative symptoms (depersonalization, derealization, dissociative amnesia, identity fragmentation) reported...
Expert Review of Neurotherapeutics
June 1, 2025
Rosalie Girard Pepin, Fatemeh Seyfzadeh, David Williamson et al.
7 citations
Disorders of consciousness (DoC) are characterized by impaired arousal and/or awareness, ranging from coma to unresponsive wakefulness syndrome, minimally conscious state, and cognitive motor dissociation. Pharmacological treatment options remain limited, complicated by the heterogeneity of etiologies, such as traumatic brain injury, stroke, and infections. The lack of rigorous clinical trials...
Journal of Affective Disorders
November 1, 2024
J Douglas Bremner, David Williamson, Viola Vaccarino
5 citations
Dissociative symptoms are both a pathological consequence of exposure to psychological trauma as well as a side effect of N-methyl-d-aspartate (NMDA) receptor antagonist medications; therefore, accurate and valid assessment of these symptoms is important. The psychometric properties of the 23-item Clinician Administered Dissociative States Scale (CADSS) have been characterized in the ketamine...
Psychiatry Research
March 15, 2023
Ibrahim Turkoz, J. Craig Nelson, Samuel T. Wilkinson et al.
19 citations
This exploratory post hoc analysis of two pooled 4-week, phase 3, double-blind, placebo- and active-controlled studies that compared esketamine nasal spray plus a newly initiated oral antidepressant (ESK+AD; n = 310) with a newly initiated oral AD plus placebo nasal spray (AD+PBO; n = 208) in patients with treatment-resistant depression (TRD) examined baseline patient demographic and...
The International Journal of Neuropsychopharmacology
December 14, 2022
David Williamson, Ibrahim Turkoz, Ewa Wajs et al.
11 citations
BACKGROUND: "Dissociation" comprises distinct phenomena, some of which are associated with esketamine treatment and some may overlap with positive symptoms of psychosis. Relationships between dissociation and psychotic symptoms assessed by -clinician report vs conventional rating scales were investigated in a post hoc analysis of data from the initial treatment session in an -open-label,...
The Journal of Clinical Psychiatry
July 16, 2021
Ibrahim Turkoz, Ella Daly, Jaskaran Singh et al.
21 citations
) and treatment-resistant depression (TRD) who did not meet response criteria within the first week of treatment. The current study is a pooled post hoc analysis of two phase 3, double-blind, active-controlled studies, conducted between August 2015 and February 2018, comparing ESK + AD with an oral antidepressant plus placebo (AD + PBO). Early treatment response was defined as a ≥ 50% decrease...