ABSTRACT
Background: Breast cancer (BC) is one of the most common invasive types of cancer among women, with important consequences on both physical and psychological functioning. Patients with BC have a great risk of developing posttraumatic stress disorder (PTSD), but few studies have evaluated the efficacy of psychological interventions to treat it. Furthermore, no neuroimaging studies have evaluated the neurobiological effects of psychotherapeutic treatment for BC-related PTSD. Objective: The study aimed to evaluate the efficacy of Eye Movement Desensitization and Reprocessing therapy (EMDR) as compared to Treatment as Usual (TAU) in BC patients with PTSD, identifying by electroencephalography (EEG) the neurophysiological changes underlying treatments effect and their correlation with clinical symptoms. Method: Thirty patients with BC and PTSD diagnosis were included, receiving either EMDR (n = 15) or TAU (n = 15). Patients were assessed before and after treatments with clinical questionnaires and EEG. The proportion of patients who no longer meet criteria for PTSD after the intervention and changes in clinical scores, both between and within groups, were evaluated. Two-sample permutation t-tests among EEG channels were performed to investigate differences in power spectral density between groups. Pearson correlation analysis was carried out between power bands and clinical scores. Results: At post-treatment, all patients treated with EMDR no longer met criteria for PTSD, while all patients treated with TAU maintained the diagnosis. A significant decrease in depressive symptoms was found only in the EMDR group, while anxiety remained stable in all patients. EEG results corroborated these findings, showing significant differences in delta and theta bands in left angular and right fusiform gyri only in the EMDR group. Conclusions: It is essential to detect PTSD symptoms in patients with BC, in order to offer proper interventions. The efficacy of EMDR therapy in reducing cancer-related PTSD is supported by both clinical and neurobiological findings.
Antecedentes: El cáncer de mama (CM) es uno de los tipos de cáncer invasivo más comunes entre las mujeres, con importantes consecuencias tanto en el funcionamiento físico como psicológico. Los pacientes con CM tienen un gran riesgo de desarrollar trastorno de estrés postraumático (TEPT), pero solo unos pocos estudios han evaluado la eficacia de las intervenciones psicológicas para tratarlo. Adicionalmente, ningún estudio de neuroimagen ha evaluado los efectos neurobiológicos del tratamiento psicoterapéutico para el TEPT relacionado con CM. Objetivo: el estudio buscó evaluar la eficacia de la terapia de desensibilización y reprocesamiento con movimientos oculares (EMDR) en comparación con el tratamiento habitual (TAU) en pacientes con TEPT en CM, identificando también mediante EEG los cambios neurofisiológicos que subyacen al efecto de los tratamientos y su correlación con los síntomas clínicos. Método: se incluyeron treinta pacientes con diagnóstico de CM y TEPT, recibiendo EMDR (n = 15) o TAU (n = 15). Los pacientes fueron evaluados antes y después de los tratamientos con cuestionarios clínicos y electroencefalografía (EEG). Se evaluó la proporción de pacientes que dejaron de cumplir con los criterios para trastorno de estrés postraumático después de la intervención y los cambios en las puntuaciones clínicas, tanto al interior como entre los grupos. Se realizaron pruebas t de permutación de dos muestras entre canales EEG para investigar las diferencias en la Densidad del Espectro de Potencia entre los grupos. Se realizó un análisis de correlación de Pearson entre bandas de potencia y puntuaciones clínicas. Resultados: En el postratamiento, todos los pacientes tratados con EMDR ya no cumplían con los criterios para TEPT, mientras que todos los pacientes tratados con TAU mantuvieron el diagnóstico. Se encontró una disminución significativa de síntomas depresivos solo en el grupo EMDR, mientras que la ansiedad se mantuvo estable en todos los pacientes. Los resultados del EEG corroboraron estos hallazgos, mostrando diferencias significativas en las bandas delta y theta en los giros angular izquierdo y fusiforme derecho solo en el grupo EMDR. Conclusiones: es esencial detectar los síntomas de TEPT también en pacientes con CM para poder ofrecer intervenciones adecuadas. La eficacia de la terapia EMDR en reducir el trastorno de estrés postraumático relacionado con el cáncer es apoyado tanto por los hallazgos clínicos como neurobiológicos.
ABSTRACT
Deep Brain Stimulation (DBS) of the Subthalamic Nucleus (STN) improves motor symptoms in Parkinson's disease (PD), but can exert detrimental effects on impulsivity. These effects are especially related to the inability to slow down when high-conflict choices have to be made. However, the influence that DBS has on delay aversion is still under-investigated. Here, we tested a group of 21 PD patients on and off stimulation (off medication) by using the Cambridge Gamble Task (CGT), a computerized task that allows the investigation of risk-related behaviours and delay aversion, and psychological questionnaires such as the Barratt Impulsiveness Scale (BIS), the Sensitivity to Punishment and to Reward Questionnaire (SPSRQ), and the Quick Delay Questionnaire (QDQ). We found that delay aversion scores on the CGT were no higher when patients were on stimulation as compared to when they were off stimulation. In contrast, PD patients reported feeling more impulsive in the off stimulation state, as revealed by significantly higher scores on the BIS. Higher scores on the sensitivity to punishment subscale of the SPSRQ highlighted that possible punishments influence patients' behaviours more than possible rewards. Significant correlations between delay aversion scores on the CGT and QDQ delay aversion subscale suggest that these two instruments can be used in synergy to reach a convergent validity. In conclusion, our results show that not all impulsivities are detrimentally affected by DBS of the STN and that the joint use of experimental paradigms and psychological questionnaires can provide useful insights in the study of impulsivity.
