Background: Depression is a major cause of suicide among adolescents. Therefore, it is crucial to find suitable depression screening tools for this population. Objective: To evaluate the use of depression rating scales as screening tools for depression in a sample of Brazilian high school students. Methods: A cross--sectional study. Three scales (BDI, CES-D, and CRS) and a screening test for general psychiatric symptoms (SRQ) were administered to a sample of 503 high school students aged between 15 to 17 years. The results were compared to those obtained with the Diagnostic and Statistical Manual of Mental Disorders (DSM-IV). Results: The prevalence of major depression using DSM-IV criteria was 10.9%. Adolescents with major depression had significantly higher (p = 0.001) scores in the SRQ and in the three scales analyzed compared to the group without depression. The sensitivity and specificity of BDI, CES-D, and CRS were 0.77 and 0.70, 0.75 and 0.73, and 0.82 and 0.71, respectively, to screen for major depression (ROC curve). The best cutoff values to suggest depression were 9 for BDI, 10 for CSR, and 14 for CES-D. The frequency of depressive symptoms was higher in girls (approximately 2:1). Discussion: The present findings support the use of the BDI, the CES-D and the CRS only for screening or as an additional symptomatic evaluation of depression in high school student. The difference in scale scores between boys and girls warns against the use of the same cutoff values for both sexes.

Introdução: O transtorno de estresse agudo (TEA) reúne um conjunto de sintomas que pode surgir nos indivíduos após exposição a um evento traumático. Este estudo verificou a relação entre o estilo defensivo e o desenvolvimento de TEA e seus sintomas em uma amostra de pacientes que sofreram trauma físico. Métodos: Este estudo transversal controlado envolveu 146 pacientes que sofreram trauma físico e necessitaram hospitalização. Um questionário estruturado foi utilizado para avaliar sintomas de TEA, baseado nos critérios diagnósticos do DSM-5, além do Questionário de Estilo Defensivo (Defense Style Questionnaire -DSQ). Resultados: Dez (6,85%) pacientes tiveram diagnóstico positivo para TEA, e 136 (93,15%), diagnóstico negativo. A maioria da amostra foi composta por homens com idade mediana variando de 33,50 a 35,50. Nos 10 pacientes positivos para TEA, destacou-se a maior utilização de mecanismos de defesa de anulação e desvalorização, pertencentes ao fator neurótico e ao fator imaturo, respectivamente. Foram observadas associações positivas entre presença de sintomas de TEA do critério B do DSM-5 e os mecanismos de defesa do DSQ, sobretudo nos mecanismos de anulação, projeção, agressão passiva, acting out, fantasia autística, deslocamento e somatização. Conclusão: Pacientes com TEA utilizaram mais mecanismos de defesa do tipo anulação e desvalorização quando comparados aos pacientes sem diagnóstico de TEA. Ressalta-se a importância da detecção precoce de sintomas de TEA a fim de evitar outros agravos relacionados ao trauma, o que representa uma importante evolução em termos de saúde pública. Descritores: Sintoma, transtorno estresse agudo, mecanismos de defesa, eventos estressantes. AbstractIntroduction: Acute stress disorder (ASD) encompasses a set of symptoms that can arise in individuals after exposure to a traumatic event. This study assessed the defense mechanisms used by victims of physical trauma who developed ASD. Method: This was a controlled cross-sectional study of 146 patients who suffered physical trauma and required hospitalization. A structured questionnaire was used to evaluate ASD symptoms based on DSM-5 diagnostic criteria, in addition to the Defense Style Questionnaire (DSQ). Results: Ten participants (6.85%) received a positive diagnosis of ASD, and 136, (93.15%) a negative diagnosis. The majority of the sample consisted of men with median age ranging from 33.50 to 35.50. The most prevalent defense mechanisms among the 10 patients with ASD were cancellation and devaluation, which belong to the neurotic and immature factors, respectively. Positive associations between the presence of symptoms from criterion B of the DSM-5 and defense mechanisms from the DSQ were found. These included the mechanisms of undoing, projection, passive aggression, acting out, autistic fantasy, displacement, and somatization. Conclusion: Patients with ASD employed different defense mechanisms such as undoing and devaluation when compared to patients not diagnosed with ASD. These results mark the importance of early det...

Objective To assess the association between brain-derived neurotrophic factor (BDNF) levels and acute stress disorder (ASD) in patients who have suffered physical trauma. Methods Data were collected at an emergency hospital in Porto Alegre, state of Rio Grande do Sul, southern Brazil. Participants were over 18 years of age, victims of physical trauma, and had been hospitalized for a minimum of 48 hours. A total of 117 hospitalized patients who agreed to participate in the research were grouped according to the shift in which blood was collected (38 subjects from the morning shift and 79 from the afternoon shift), had their BDNF levels measured and responded to other questionnaires. Respondents were further grouped by age into three ranges: 18-30, 31-50 and 51-70 years. Results We found a significant difference in the distribution of BDNF between the two shifts in which blood samples were collected, with the afternoon group having higher BDNF levels (U = 1906.5, p = 0.018). A difference was observed only between the 18-30 group and the 51-70 group in the afternoon shift (Umorning = 1107, pmorning = 0.575; Uafternoon = 7175, pafternoon = 0.028). Conclusions The population whose blood samples were collected in the afternoon showed significantly higher values of BDNF compared to those of the morning shift. This same population presented lower BDNF levels when associated with ASD subtypes A1, A2, and A. We hypothesize that the lower values of BDNF measured in the morning shift were due to a response to the circadian cycle of cortisol, whose action inhibits the expression of serum neurotrophins.