Structural neuroimaging and predominant polarity in patients with type 1 bipolar disorder from Antioquia.

INTRODUCTION: Predominant polarity (PP) has been proposed as a specifier of bipolar disorder (BD) due to its relationship with clinical and prognostic variables. It is possible that this is due to a different underlying neurobiology, in such a way that the changes found by structural nuclear magnetic resonance imaging (sMRI) in BD are different and specific. OBJECTIVES: To explore findings of structural neuroimaging in patients with BD type I (BD-I) according to PP. METHODS: Cross-sectional study that evaluated 77 patients with BD-I using the DIGS interview. PP was established using the operative definition of two-thirds of all affective episodes throughout life to classify PP as manic (MPP), depressive (DPP) or indeterminate (IPP). MRI was performed during the euthymia phase to measure intracranial structures. The data obtained was analysed using a linear regression model adjusted for confounding variables (drug use, alcohol use, psychoactive substance use) and were compared between the three groups finding the standardised mean difference (SMD). RESULTS: Differences with adequate effect size were found in three brain structures after adjusting for confounding variables, specifically in the right fusiform gyrus and the left lingual gyrus, which were greater in the DPP group than in the MPP group (SMD = 0.92; 95% CI = 0.34-1.49 and SMD = 0.78; 95% CI = 0.21-1.35). Likewise, in the right thalamus, it was shown to be greater in the IPP group compared to MPP group (SMD 0.89, 95% CI = 0.31-1.46). CONCLUSIONS: A reduction in the thickness of the right fusiform gyrus and the left lingual gyrus, as well as the right thalamic volume was observed in patients with BD-I with PPM, which supports the hypothesis that PP has a plausible neurobiological correlate and could have potential utility as a BD specifier.

[Factors associated with the intensity of anxiety and depression symptoms in health workers of two centres of reference for COVID 19 patient care in Antioquia, Colombia - a latent class analysis]. / Factores asociados con la intensidad de los síntomas ansiosos y depresivos en personal de salud de dos centros de referencia para la atención de pacientes con COVID-19 de Antioquia, Colombia. Un análisis de clases latentes.

Objective: To classify the staff of two reference institutions for COVID-19 care in Antioquia according to the intensity of anxiety and depression symptoms, and to determine the factors associated with these classes.Methods:Cross-sectional study in which the GAD-7, PHQ-9, fear of COVID-19, and the Copenhagen Burnout scale were used. Latent class analysis was performed to identify the classes, and the factors associated with these were determined using multinomial logistic regression.Results: 486 people participated. The three-class model had the best fit: class I with low scores on the scales; class II with mild degrees of anxiety and depression, and intermediate levels of fear of COVID-19 and perceived stress; and class III with moderate and severe degrees of anxiety, depression, and perceived stress. The factors associated with belonging to class III were age (OR=0.94; 95%CI, 0.91-0.96), change of residence to avoid exposing relatives (OR=4.01; 95%CI, 1.99-8.09), and a history of depressive disorder (OR=3.10; 95%CI, 1.27-7.56), and anxiety (OR=5.5; 95%CI, 2.36-12.90). Factors associated with class II were age (OR=0.97; 95%CI, 0.95-0.99), history of depressive disorder (OR=3.41; 95%CI, 1.60-7.25), living with someone at risk of death from COVID-19 (OR=1.86; 95%CI, 1.19-2.91), family member being healthcare staff (OR=1.58; 95%CI, 1.01-2.47), and change of residence to avoid exposing relatives (OR=1.99; 95%CI, 1.11-3.59).Conclusions: Three classes of participants were obtained, two of them with anxiety and depression symptoms. Younger age and a history of mental disorder were factors associated with the two classes of symptomatic patients; other factors may be causes or consequences of the symptoms.

Correlation Between Cognitive Performance and Structural Neuroanatomy in Patients with Type I Bipolar Affective Disorder Treated with and Without Lithium. / Correlación entre el desempeño cognitivo y la neuroanatomía estructural en pacientes con trastorno afectivo bipolar tipo I tratados con y sin litio.

INTRODUCTION: Lithium treatment of bipolar disorder (BD) has been associated with less cognitive impairment and fewer changes in structural brain anatomy compared to other treatments. However, the studies are heterogeneous and few assess whether these effects are related. The objective of this study was to evaluate and relate cognitive performance and structural neuroanatomy in patients treated with and without lithium. METHODS: Cross-sectional study that included 48 subjects with BD-I, of which 22 were treated with lithium and 26 without lithium. Performance was assessed on Wechsler III (WAIS III), TMT A and B (Trial Making Test) neuropsychological tests, California verbal learning test (CVLT), Rey complex figure test and Wisconsin card sorting test. Brain structures obtained by magnetic resonance imaging (MRI) were evaluated. The standardised mean difference (SMD) between both groups was calculated, adjusted for confounding variables using a propensity score, and the Spearman correlation coefficient (ρ) was used to assess the relationship between cognitive performance and neuroanatomical regions. RESULTS: Compared to the group without lithium, the group with lithium had fewer perseverative errors in the Wisconsin test (SMD = -0.69) and greater left and right cortical areas (SMD = 0.85; SMD = 0.92); greater surface area in the left anterior cingulate (SMD = 1.32), right medial orbitofrontal cortex (SMD = 1.17), right superior frontal gyrus (SMD = 0.82), and right and left precentral gyrus (SMD = 1.33; SMD = 0.98); greater volume of the right amygdala (SMD = 0.57), right hippocampus (SMD = 0.66), right putamen (SMD = 0.87) and right thalamus (SMD=.67). In the lithium group, a correlation was found with these errors and the thickness of the left precentral gyrus (ρ = -0.78), the volume of the right thalamus (ρ =-0.44), and the right amygdala (ρ = 0.6). CONCLUSIONS: The lithium group had better cognitive flexibility and greater dimension in some frontal and subcortical cortical regions. Furthermore, there was a moderate to high correlation between performance in this executive function and the thickness of the right precentral gyrus, and the volumes of the thalamus and the right amygdala. These findings could suggest a neuroprotective effect of lithium.

Neuroimagen estructural y polaridad predominante en pacientes con trastorno afectivo bipolar tipo I de Antioquia / Structural Neuroimaging and Predominant Polarity in Patients with Type 1 Bipolar Disorder from Antioquia

RESUMEN Introducción: La polaridad predominante (PP) se ha propuesto como un especificador del trastorno afectivo bipolar (TAB) por su relación con variables clínicas y pronósticas. Es posible que esto se deba a una neurobiología subyacente distinta, de tal manera que los cambios encontrados por resonancia magnética estructural (RMe) en el TAB sean diferentes y específicos. Objetivos: Explorar hallazgos de neuroimagen estructural en pacientes con TAB I de acuerdo con la PP. Métodos: Estudio de corte transversal que evaluó a 77 pacientes con TAB I usando la entrevista DIGS. Se estableció la PP utilizando la definición operativa de los 2 tercios de todos los episodios afectivos a lo largo de la vida para clasificar la PP en maniaca (PPM), depresiva (PPD) o indeterminada (PPI). Se les realizó RMe durante la fase de eutimia para medir estructuras intracraneales. Los datos obtenidos se analizaron mediante un modelo de regresión lineal ajustado por variables de confusión (consumo de medicamentos, consumo de alcohol, consumo de sustancias psicoactivas) y se compararon entre los 3 grupos para hallar la diferencia de medias estandarizada (DME). Resultados: Se encontraron diferencias con adecuado tamaño de efecto en 3 estructuras cerebrales tras ajustar por variables de confusión, específicamente en el giro fusiforme derecho y el giro lingual izquierdo, que fueron mayores en el grupo de PPD que en el de PPM (DME = 0,92; IC95%, 0,34-1,49; DME = 0,78; IC95%, 0,21-1,35). Así mismo en el tálamo derecho, que se mostró mayor en el grupo de PPI frente al de PPM (DME = 0,89; IC95%, 0,31-1,46). Conclusiones: Se observó una reducción del espesor del giro fusiforme derecho y el giro lingual izquierdo, así como del volumen talámico derecho en pacientes con TAB I con PPM, lo que respalda la hipótesis de que la PP cuenta con un correlato neurobiológico plausible y podría tener potencial utilidad como especificador del TAB.

ABSTRACT Introduction: Predominant polarity (PP) has been proposed as a specifier of bipolar disorder (BD) due to its relationship with clinical and prognostic variables. It is possible that this is due to a different underlying neurobiology, in such a way that the changes found by structural nuclear magnetic resonance imaging (sMRI) in BD are different and specific. Objectives: To explore findings of structural neuroimaging in patients with BD type I (BD-I) according to PP. Methods: Cross-sectional study that evaluated 77 patients with BD-I using the DIGS interview. PP was established using the operative definition of two-thirds of all affective episodes throughout life to classify PP as manic (MPP), depressive (DPP) or indeterminate (IPP). MRI-was performed during the euthymia phase to measure intracranial structures. The data obtained was analyzed using a linear regression model adjusted for confounding variables (drug use, alcohol use, psychoactive substance use) and were compared between the three groups finding the standardized mean difference (SMD). Results: Differences with adequate effect size were found in three brain structures after adjusting for confounding variables, specifically in the right fusiform gyrus and the left lingual gyrus, which were greater in the DPP group than in the MPP group (SMD = 0.92; 95% CI = 0.34 to 1.49 and SMD = 0.78; 95% CI = 0.21 to 1.35). Likewise, in the right thalamus, it was shown to be greater in the IPP group compared to MPP group (SMD 0.89, 95% CI = 0.31 to 1.46). Conclusions: A reduction in the thickness of the right fusiform gyrus and the left lingual gyrus, as well as the right thalamic volume was observed in patients with BD-I with PPM, which supports the hypothesis that PP has a plausible neurobiological correlate and could have potential utility as a BD specifier.