RESUMO. Avaliações cognitivas repetidas em estudos longitudinais favorecem a ocorrência de efeitos de retestagem ou de prática, geralmente aumentando os escores obtidos nas avaliações de acompanhamento quando comparados aos da primeira avaliação. Sendo assim, os efeitos do retestagem podem comprometer a verificação do declínio cognitivo em idosos. Objetivos: Objetivamos verificar a ocorrência do efeito de prática e o impacto das características sociodemográficas nos escores de seguimento em uma amostra de 5.592 participantes com perfil sociodemográfico diverso, avaliada duas vezes durante quatro anos de seguimento. Métodos: Testamos duas abordagens possíveis para corrigir o efeito de prática e calculamos o índice de mudança confiável. Resultados: Observamos escores sutilmente maiores na avaliação de seguimento após quatro anos, o que sugere a ocorrência de efeitos de retestagem. A correção pela diferença da regressão gerou escores corrigidos de acompanhamento satisfatórios, enquanto a correção pela diferença média não forneceu correções eficazes. As características sociodemográficas tiveram impacto mínimo no efeito de prática. Conclusões: Recomendamos a forma de correção pela diferença da regressão para efeitos de retestagem. A ausência dessa abordagem metodológica, quando utilizamos escores cognitivos longitudinais, pode levar a resultados enviesados.

ABSTRACT. Repeated cognitive assessment in longitudinal studies favors the occurrence of retest effects, usually increasing the scores obtained at the follow-up assessments when compared to baseline. Therefore, retest effects can compromise the evaluation of cognitive decline in older adults. Objectives: We aimed to verify the occurrence of the retest effect and the impact of sociodemographic characteristics on the follow-up scores in a sample of 5,592 participants with a diverse sociodemographic profile, who were assessed twice during 4 years of follow-up. Methods: We tested two possible approaches to correct the retest effect and calculated the Reliable Change Index. Results: We observed increased scores at the follow-up assessment after 4 years, but the results indicate a modest occurrence of retest effects. The regression difference correction successfully generated follow-up corrected scores, while the mean difference did not provide effective corrections. Sociodemographic characteristics had a minor impact on the retest. Conclusions: We recommend the regression difference correction for retest effects. The absence of this methodological approach might lead to biased results using longitudinal cognitive scores.

Abstract Background: Although widely used in clinical practice and research, Diagnostic and Statistical Manual of Mental Disorders (DSM) diagnoses have low validity: patients with different mental disorders can share similar symptoms, while those with the same diagnosis might have different symptoms. In fact, the DSM diagnostic system has been considered one of the main obstacles for further development of psychiatric research. Recently, it has been proposed that psychiatry nosology should be reframed according to a biologically-based etiology. Objectives: To review present and past endeavors of establishing an etiology-based nosology. Methods: Comprehensive review of articles on the topic. Results: From Hippocrates onwards, multiple attempts have been undertaken aiming to move etiology and nosology closer. The most recent efforts are represented by Developmental Psychopathology (DP) and the Research Domain Criteria (RDoC), which presents an operational matrix recommended to be used in clinical research instead of the DSM diagnoses. Discussion: The DSM-based nosology is faulty. RDoC and DP might be interesting alternatives for an etiology-based nosology. However, while DP has already brought promising results, RDoC is a novel proposal, whose advantages and disadvantages should gradually be identified in the upcoming years.

ABSTRACT BACKGROUND: Patients with major depressive disorder (MDD) have distinct personality traits, compared with control subjects, although the role of anxiety and positive and negative affects in this finding is unclear. DESIGN AND SETTING: A case-control study enrolling 103 antidepressant-free depressed patients and 103 age and gender-matched controls was conducted at the University Hospital, University of São Paulo. METHODS: The self-reported scales of the Positive and Negative Affect Schedule (PANAS), State-Trait Anxiety Inventory (STAI) and Cloninger’s Temperament and Character Inventory (TCI) were applied. Temperament and character traits were compared between groups using multivariate and bivariate analyses of variance (MANOVA and ANOVA). The influence of anxiety and affect was further investigated using ANOVA and mediation analyses. RESULTS: Depressed patients presented higher harm avoidance and lower self-directedness scores than controls. After adjustment for anxiety trait, harm avoidance was no longer significantly different between groups. Mediation analysis revealed that the anxiety trait, but not state-anxiety or affect, fully mediated the influence of group (depressed versus control subjects) on harm avoidance. CONCLUSIONS: Our findings confirm that depressed patients present personality traits distinct from those of controls and suggest that MDD is not directly associated with harm avoidance, but that this effect is fully mediated through the anxiety trait.

OBJETIVO: A hipótese da depressão vascular (DV) defende uma correlação bidirecional entre fatores de risco cerebrovasculares e depressão. Nós investigamos se este conceito é apropriado para intervenções clínicas - ou seja, se o tratamento de sintomas depressivos modifica o risco cerebrovascular e vice-versa. MÉTODO: Revisão sistemática de estudos intervencionistas publicados entre outubro/1997 e abril/2010 nos bancos de dados MEDLINE e outros. Os unitermos procurados foram "depressive disorder" (MeSH), "cerebrovascular disorders" (MeSH) e um conjunto de termos altamente acurados para procurar por estudos experimentais ou quasi-experimentais. Nós usamos um questionário estruturado para examinar se os critérios de DV usados para depressão, vascular, neuroimagem e neuropsicológicos foram adequados, e os resultados principais de cada estudo. RESULTADOS: De 357 artigos obtidos, 12 foram inclusos. Eles relataram adequadamente o critério de depressão, moderadamente os critérios neuropsicológicos e de neuroimagem e apresentaram erros graves no critério vascular. Estudos de eficácia sugeriram que nimodipina, estimulação magnética transcraniana, stent de carótida e citalopram são efetivos para DV. Estudos exploratórios sugeriram que hiperintensidades de substância branca e risco vascular global são preditores de pior resposta. Apesar da baixa qualidade dos estudos limitar a sua generalização, estudos de maior qualidade corroboram o conceito de DV para intervenções. CONCLUSÃO: DV parece ser um conceito útil para intervenções clínicas, porém estudos futuros devem refinar os critérios cerebrovasculares para identificar sua importância na eficácia do tratamento antidepressivo.

OBJECTIVE: Vascular depression (VaD) hypothesis supports a bidirectional relationship between cerebrovascular risk factors (CRFs) and depression. We examined whether such concept is appropriate for clinical interventions; i.e., whether treating depressive symptoms has an impact on cerebrovascular risk and vice-versa. METHOD: Systematic review on interventional studies published from October-1997 to April-2010 on MEDLINE and other databases. Search terms were "depressive disorder" (MeSH), "cerebrovascular disorders" (MeSH), and a batch of highly accurate terms to search for experimental and quasi-experimental trials. We used a structured questionnaire to assess the adequacy of the VaD criteria used for vascular, depression, neuroimaging, and neuropsychological features, as well as the main results of each study. RESULTS: Of the 357 retrieved studies, 12 met our eligibility criteria. These studies adequately reported depression criterion, moderately reported neuroimaging and neuropsychological criteria, and showed severe flaws in vascular assessment. Efficacy trials suggested that nimodipine, transcranial magnetic stimulation, carotid stent placement, and citalopram were effective for VaD. Exploratory studies suggested that white-matter hyperintensities and global vascular risk are predictors of poor response. Although the low quality of the studies hinders the findings' generalization, studies of higher validity support the VaD concept for interventions. CONCLUSION: VaD seems to be a useful concept for clinical interventions; however, further trials should refine CRFs criteria to assess its impact on antidepressant efficacy.