Dopamine D2 receptor gene polymorphisms and externalizing behaviors in children and adolescents.

BACKGROUND: Dopamine is involved in several cerebral physiological processes, and single nucleotide polymorphisms (SNP) in the dopamine D2 receptor gene (DRD2) have been associated with numerous neurological and mental disorders, including those involving alterations in cognitive and emotional processes. METHODS: The aim of this study was to evaluate the association between the SNPs c.957C > T (rs6277) and c.-585A > G (rs1799978) in the DRD2 gene and behavioral characteristics of children and adolescents based on an inventory of the Child Behavior Checklist (CBCL). Children and adolescents between 8 and 20 years old who were clinically followed-up were genotyped for the SNPs c.957C > T and c.-585A > G, and related to data of the CBCL/6-18 scale assessment performed with the help of caregivers. The chi-squared test was used to assess the differences in the frequencies of the C and T alleles in the polymorphism c.957C > T and of the A and G alleles in the polymorphism c.-585A > G with respect to the grouped CBCL scores at a significance level of 5%. Multiple logistic regression models were performed, to control whether sex and/or ethnicity could influence the results. RESULTS: Eighty-five patients were assessed overall, and the presence of the T allele (C/T and T/T) of DRD2 c.957C > T polymorphism was found to be significantly associated with the occurrence of defiant and oppositional problems and with attention and hyperactivity problems. There were no associations detected with polymorphism DRD2 c.-585A > G polymorphism. Both SNPs were in Hardy-Weinberg-equilibrium. CONCLUSIONS: Although the findings of this study are preliminary, due to its small number of participants, the presence of T allele (C/T, T/T) in c.957C > T SNP was associated with difficulty in impulse control, self-control of emotions, and conduct adjustment, which can contribute to improving the identification of mental and behavioral phenotypes associated with gene expression.

A historiographic study of psychiatric treatments in Brazil: mentalism and organicism from 1830 to 1859.

Our aim is to investigate two major tendencies in nineteenth-century Brazilian alienism: mentalism and organicism, by conducting a descriptive study of original Brazilian documents on medical health treatments in the 1830s, 1840s and 1850s. Primary sources of Brazilian alienism were theses, memoirs, official reports, and documents written by clinicians and asylum directors. We analysed early mental treatment in Brazilian lunatic asylums, exploring the relative contributions of two main theoretical orientations: moral treatment (based on Pinel and Esquirol) and 'medical-organicist therapeutic orientation'. Intertextuality was used to assess reports of medical organicist treatment in Brazil. We concluded that contemporaneous textual sources indicate that mid-nineteenth-century alienism in Brazil was predominantly influenced by organicism exported from European countries. Pinel's mentalist view, nevertheless, remained the reference point for clinical issues associated with the doctor-patient relationship.

Successful Clozapine Rechallenge After Clozapine-Induced Severe Anemia: A Case Report.

INTRODUCTION: Clozapine, a second-generation antipsychotic (SGA), is considered the gold standard medication to treat patients with treatment-resistant schizophrenia (TRS). Despite its efficacy, clozapine is associated with adverse effects, notably neutropenia and agranulocytosis. Other hematological adverse effects are less common. Severe anemia is a rare adverse effect seldom reported in the literature and is typically associated with pure red cell aplasia (PRCA). Nevertheless, the benefits of clozapine in managing TRS make rechallenge a reasonable option. CASE REPORT: We present the case of a 35-year-old man with TRS, resistant to previous antipsychotics, who experienced severe anemia during clozapine treatment. An investigation for clozapine-induced anemia revealed PRCA on myelogram. After discontinuing clozapine, the patient's hemoglobin levels recovered. Subsequent treatments with olanzapine, zuclopenthixol, and aripiprazole proved ineffective, leading us to consider a clozapine rechallenge. The rechallenge, monitored for 58 days, resulted in improved psychiatric symptoms and stable hemoglobin levels. The patient remained stable during 6 months of follow-up, with no hematological changes. DISCUSSION: PRCA is a very rare adverse effect of clozapine. The cause of drug-induced PRCA is still unknown; for clozapine, there are no studies. Rechallenge after a severe and rare adverse effect is a complex decision. This case is the first to report a successful clozapine rechallenge following severe anemia without other blood dyscrasias, emphasizing the imperative need for close monitoring during the rechallenge process. Further study is warranted to understand the predictive factors for a successful outcome in clozapine rechallenges.

Refinement of chromosome 3p22.3 region and identification of a susceptibility gene for bipolar affective disorder.

Genome-wide association studies and meta-analysis, as well as our own previous family-based association results, have pointed to chromosome (ch) 3p22.3 and 3p21.1 as candidate regions to contain a susceptibility gene for bipolar affective disorder (BPAD). In the present study, we further refined the region of interest on ch 3p22.3. We genotyped 94 SNPs within the candidate region in 74 families and performed family-based association analysis using a transmission disequilibrium test. One single SNP (rs166508) was associated with the BPAD phenotype (P = 0.0187). This SNP is located within intron 15 of the integrin alpha 9 (ITGA9) gene. ITGA9 encodes the α9 subunit of the α9ß1 integrin, a membrane glycoprotein receptor for neurotrophins, such as nerve growth factor (NGF) and brain-derived neurotrophic factor (BDNF). Quantification of ITGA9 transcripts in the peripheral blood of patients with BPAD and controls showed an upregulation of ITGA9 (Kruskal-Wallis P = 0.0339) in patients with the disease-associated genotype (rs166508*A/A), compared to those with rs166508*G/G and rs166508*G/A genotypes. Sequencing of the ITGA9 cDNA revealed a sequence variant (r.1689_1839del) in rs166508*A carriers, which leads to loss of the entire exon 16. In silico analysis revealed that the deleted region contains three putative microRNA binding sites, which may be involved in the negative regulation of ITGA9. In conclusion, our results confirm previous evidence pointing to a candidate region for BPAD on ch 3p.22.3. In addition, we suggest a molecular substrate that could explain the increase of ITGA9 mRNA levels in probands with BPAD, proposing a new mechanism that could be involved in the genetic susceptibility to the disease.

Nonsuicidal self-injury in undergraduate students: a cross-sectional study and association with suicidal behavior.

The objective of this study was to investigate nonsuicidal self-injury (NSSI) in graduates and correlate NSSI with sociodemographic profile, suicidal behavior, and prior mental health disorders. The study is part of a larger survey investigating sociodemographic profile, quality of life and mental health in undergraduates from one of Brazil´s largest universities. A bespoke questionnaire was devised about NSSI based on the DSM5 diagnostic criteria. The data were analyzed using the statistical analysis package SPSS. A total of 6.906 university students took part in the study. Regarding NSSI, 17.8% of students reported at least one episode in their lifetime, and 35% reported age at NSSI onset of 14-16 years. Self-injurious behavior was associated with female gender, self-reported black skin color, dissatisfaction with the chosen course, history of bullying and prior mental disorder. There was a ten times greater risk of suicidal behavior among self-injurers and this risk was higher still for recurrent NSSI.

Depressive symptoms in rheumatoid arthritis.

OBJECTIVE: To determine the prevalence of depressive and anxiety symptoms in patients with rheumatoid arthritis (a chronic inflammatory disease) in comparison to a control group with osteoarthritis (a chronic non-inflammatory degenerative disease) and to identify the sociodemographic and clinical variables associated with depressive symptoms in these patients. METHOD: Sixty-two rheumatoid arthritis patients and 60 osteoarthritis patients participated in the study. Sociodemographic and clinical data were collected and the Hospital Anxiety and Depression Scale and the Disability Index of the Health Assessment Questionnaire were applied. RESULTS: The prevalence of depressive symptoms was of 53.2% in rheumatoid arthritis and 28.3% in osteoarthritis (p = 0.005). The prevalence of anxiety symptoms was of 48.4% in rheumatoid arthritis and 50.0% in osteoarthritis (p = 0.859). The mean (and standard deviation) scores in the Disability Index of the Health Assessment Questionnaire were 1.4 (0.8) in rheumatoid arthritis and 1.4 (0.6) in osteoarthritis (p = 0.864). Rheumatoid arthritis patients with depressive symptoms had lower education and higher disease activity and functional disability. CONCLUSION: Although these two rheumatic diseases are similar in terms of the pain and functional disability that they cause, a significantly higher prevalence of depressive symptoms was found in rheumatoid arthritis patients. This difference might be explained by the hypothesis of a neuroimmunobiological mechanism related to cytokines in inflammatory diseases, which has been considered as a candidate to the development of depressive symptoms.

Patients with Schizophrenia Undergoing Gastric Bypass Surgery: a Case Series Study.

PURPOSE: Obesity affects approximately 45-55% of persons with schizophrenia and is more difficult to manage in these individuals than in the general population, apart from being an additional factor for morbidity and premature mortality. Although bariatric surgery is considered the most effective long-term treatment for severe obesity, there are few reports on the outcomes of this procedure in persons with schizophrenia. This study aimed to evaluate weight loss and psychiatric symptoms in persons with obesity and schizophrenia after bariatric surgery. MATERIALS AND METHODS: Five persons with schizophrenia and moderate to severe obesity who underwent bariatric surgery were followed up for 2 years. Anthropometric data were collected, and psychiatric symptoms were evaluated using the Positive and Negative Syndrome Scale (PANSS), which assessed the pre- and postoperative occurrence and severity of symptoms of schizophrenia. RESULTS: The mean body mass index before surgery was 43.5 ± 5.2 kg/m2 and decreased to 28.1 ± 1.9 kg/m2 1 year postoperatively. The mean percentage of total postoperative weight loss was 30.7 ± 6.8% after 6 months, 34.7 ± 7.9% after 1 year, and 34.3 ± 5.5% after 2 years. Before surgery, all subjects were in remission based on the PANSS. Postoperative evaluations showed that the participants had no relapse of psychiatric symptoms (p > 0.05 for the three PANSS dimensions throughout the follow-up period). There were no considerable changes in their medication regimens. CONCLUSIONS: These findings suggest that bariatric surgery may be a viable treatment option for stable patients with schizophrenia if they have a preoperative assessment and close management and involvement by mental health professionals throughout the course of treatment.

Violent crime and dimensions of delusion: a comparative study of criminal and noncriminal delusional patients.

Some aspects of delusional disorders appear to be related to the occurrence of violent crime. A retrospective study was conducted comparing two groups of 30 psychotic, delusional patients. The study group consisted of delusional patients imprisoned in a high-security forensic hospital in the state of São Paulo, Brazil, and the patients in the comparative group were enrolled in common psychiatric wards. The PANSS (Positive and Negative Syndrome Scale), the MINI (Mini International Neuropsychiatric Interview), and the MMDAS (MacArthur-Maudsley Delusion Assessment Schedule) scales were used. Regarding the dimensions of delusions, the study group had lower scores in two categories: refraining from acting because of belief, and negative affect. Delusions that induce inhibition of actions apparently also reduce the potential for violent acts and, contrary to current beliefs, delusional patients who are frightened or who have other negative affects associated with delusional ideas appear to commit fewer violent acts. Intrinsic factors inherent in some dimensions of delusion may be relevant in the occurrence of violent crimes committed by psychotic patients.

Gray and white matter imbalance--typical structural abnormality underlying classic autism?

Recent evidence supports increased cortical activity and impaired brain connectivity in autism, but the structural correlates of these abnormalities are not yet defined. We performed a voxel based morphometry analysis of brain MRI from patients with autism selected from a group of 103 subjects with pervasive developmental disorders. Twelve male patients with mean age of 12.4 +/- 4 years were compared with 16 matched controls. Patients with autism exhibited increase in gray matter in medial and dorsolateral frontal areas, in the lateral and medial parts of the temporal lobes, in the parietal lobes, cerebellum and claustrum. Patients also showed decrease in frontal, parietal, temporal and occipital white matter. The combination of enlarged cortex and reduced white matter is possibly the structural basis of some symptoms of classic autism.

Religious affiliation and psychiatric morbidity in Brazil: higher rates among evangelicals and spiritists.

AIMS: To verify the association between the prevalence of mental symptoms and excessive alcohol intake with religious affiliation, church attendance and personal religiosity. METHODS: A household survey of 515 adults randomly sampled included the WHO SUPRE-MISS questionnaire, SRQ-20 and AUDIT. Weighted prevalences were estimated and logistic analyses were performed. RESULTS: Minor psychiatric morbidity was greater among Spiritists and Protestants/ Evangelicals than in Catholics and in the ;no-religion' group. The latter had a greater frequency of abusive alcohol drinking pattern and Protestants/Evangelicals showed lower drinking patterns. CONCLUSIONS: Although belonging to Protestant/Evangelical churches in Brazil may inhibit alcohol involvement it seems to be associated to a higher frequency of depressive symptoms. Processes of seeking relief in new religious affiliations among sub-groups with previous minor psychiatric symptoms may probably occur in the Brazilian society.

[Religion and psychiatric disorders in patients admitted to a university general hospital]. / Religião e transtornos mentais em pacientes internados em um hospital geral universitário.

In order to evaluate the prevalence of psychiatric disorders in a Brazilian general hospital and their association with religious denomination and religiosity, 253 inpatients were interviewed. A socio-demographic questionnaire and an instrument for diagnosis of mental disorders (MINI-Plus) were applied. Distribution of religious denominations was: Catholic 63.2% (n=177), Evangelical Protestant 20.4% (n=57), Spiritist 4.3% (n=12), traditional Protestant 2.3% (n=8), and "no religion" 7.5% (n=21). Degree of religiosity was: very religious 43.2% (n=116), religious 46.9% (n=129), hardly religious 9.8% (n=27), and not at all religious 1.1% (n=3). Evangelical (Pentecostal) religious affiliation and frequent attendance at worship services were associated with fewer alcohol problems. Membership in an Evangelical (Pentecostal) church may thus have an inhibitory effect on alcohol dependence or abuse. Intensity of religiosity was moderately associated with overall prevalence of disorders, especially bipolar disorder. It is reasonable to conclude that extreme situations (very intense versus very limited religious participation) are related to this finding, associating both an exacerbated pursuit of religion and alienation from it with altered mental states.

Differences in Cortical Structure and Functional MRI Connectivity in High Functioning Autism.

Autism spectrum disorders (ASD) represent a complex group of neurodevelopmental conditions characterized by deficits in communication and social behaviors. We examined the functional connectivity (FC) of the default mode network (DMN) and its relation to multimodal morphometry to investigate superregional, system-level alterations in a group of 22 adolescents and young adults with high-functioning autism compared to age-, and intelligence quotient-matched 29 healthy controls. The main findings were that ASD patients had gray matter (GM) reduction, decreased cortical thickness and larger cortical surface areas in several brain regions, including the cingulate, temporal lobes, and amygdala, as well as increased gyrification in regions associated with encoding visual memories and areas of the sensorimotor component of the DMN, more pronounced in the left hemisphere. Moreover, patients with ASD had decreased connectivity between the posterior cingulate cortex, and areas of the executive control component of the DMN and increased FC between the anteromedial prefrontal cortex and areas of the sensorimotor component of the DMN. Reduced cortical thickness in the right inferior frontal lobe correlated with higher social impairment according to the scores of the Autism Diagnostic Interview-Revised (ADI-R). Reduced cortical thickness in left frontal regions, as well as an increased cortical thickness in the right temporal pole and posterior cingulate, were associated with worse scores on the communication domain of the ADI-R. We found no association between scores on the restrictive and repetitive behaviors domain of ADI-R with structural measures or FC. The combination of these structural and connectivity abnormalities may help to explain some of the core behaviors in high-functioning ASD and need to be investigated further.

Prevalência de comportamento suicida em estudantes de Medicina / Prevalence of suicidal behavior in Medical students

Resumo: Introdução: Médicos e alunos de Medicina são grupos de risco para o suicídio e comportamento suicida. Comportamentos suicidas abrangem fenômenos que vão desde pensamentos, planejamentos, tentativas e até a morte por suicídio. Sabe-se pouco sobre o comportamento suicida entre estudantes de Medicina brasileiros. Objetivo: Este estudo teve como objetivos avaliar a prevalência de ideação, planejamentos e tentativas suicidas em uma amostra de estudantes de graduação em Medicina do Brasil, e identificar os fatores sociodemográficos, de vida estudantil e de saúde mais associados a esses comportamentos. Método: Participaram do estudo 722 alunos do curso de Medicina da Unicamp, durante os anos de 2017 e 2018, que responderam de forma voluntária e anônima a um questionário amplo, que incluía dados sociodemográficos, de vida acadêmica e de comportamento suicida. A análise estatística foi realizada por meio do teste de qui-quadrado, do teste de Mann-Whitney e da regressão logística múltipla. Adotou-se o nível de significância estatística de 95%. Resultado: As prevalências de pensamentos, planejamento e tentativas de suicídio ao longa da vida foram respectivamente 196 (27,3%), 64 (8,9%) e 26 (3,6%). Nos 30 dias que antecederam a pesquisa, 36 (5%) pensaram seriamente em pôr fim à própria vida, e 11 (1,5%) planejaram concretamente colocar fim a própria vida. Bullying, presença de transtorno mental, procura de assistência em saúde mental na universidade, uso de calmante sem prescrição médica, baixo nível socioeconômico, morar sozinho, religião (ateus, agnósticos e espiritualistas) e grau de religiosidade são os fatores que, conjuntamente, melhor explicam a chance de comportamento suicida. Conclusão: Alunos de Medicina apresentam prevalências importantes de comportamento suicida.

Abstract: Introduction: Physicians and medical students constitute groups at risk for suicide and suicidal behavior. Suicidal behaviors encompass phenomena ranging from thoughts, planning, and finally death by suicide. Little is known about suicidal behavior among Brazilian medical students. Objective: The aim of this study was to assess the prevalence of suicidal ideation, planning and suicide attempt in a sample of undergraduate medical students in Brazil, as well as to identify the sociodemographic, student life aspects and health factors most often associated with suicidal behavior. Method: A total of 722 medical students at Unicamp, during 2017 and 2018, voluntarily and anonymously answered a broad questionnaire, including sociodemographic data, aspects of academic life and suicidal behavior. A statistical analysis was performed using the chi-square test, Mann-Whitney test, and multivariate logistic regression. A statistical significance level of 95% was adopted. Results: The lifetime prevalence rates of suicidal thoughts, planning and attempts were respectively 196 (27.3%), 64 (8.9%), and 26 (3.6%). In the 30 days prior to the survey, 36 (5%) seriously thought about ending their own lives, and 11 (1.5%) concretely planned to end their own lives. Bullying, presence of mental disorder, seeking mental health care at the university, use of sedatives without a prescription, low socioeconomic level, living alone, religion (atheists, agnostics and spiritualists) and degree of religiousness are the factors that, together, best explain the chance of suicidal behavior. Conclusion: Medical students show important prevalence rates of suicidal behavior.

[Perception of community problems: the influence of socio-demographic and mental health factors]. / Percepção dos problemas da comunidade: influência de fatores sócio-demográficos e de saúde mental.

A cross-sectional study was designed to identify which social problems from a list of 17 were considered important and to analyze differences in perception among interviewees according to socio-demographic variables and presence of common mental disorders. A household survey was performed in Campinas, São Paulo, Brazil, with a stratified cluster sample of urban residents aged 14 years or older (N = 515) using the WHO/SUPRE-MISS interview and SRQ-20. Weighted prevalence and crude prevalence ratio with respective 95%CI were calculated. Multiple analyses were performed using Poisson regression. Drug traffic, drug abuse, unemployment, crime, and alcohol abuse were considered severe by more than 45% of the sample. Women and individuals living in medium-low income areas attributed greater severity to drug traffic, alcohol and drug abuse, child and spousal abuse, unemployment, and poverty. Females and individuals with positive SRQ-20 identified problems related to education as more severe. Differences in perception according to socioeconomic status and gender were observed, with women and low-income residents showing the greatest susceptibility.

Prevalence of alcohol abuse and associated factors in a population-based study.

OBJECTIVE: To estimate the prevalence of alcohol abuse/dependence and identify associated factors among demographic, family, socioeconomic and mental health variables. METHODS: A household survey was carried out in the urban area of Campinas, southeastern Brazil, in 2003. A total of 515 subjects, aged 14 years or more were randomly selected using a stratified cluster sample. The Self-Report Questionnaire and the Alcohol Use Disorder Identification Test were used in the interview. Prevalences were calculated, and univariate and multivariate logistic analyses performed by estimating odds ratios and 95% confidence intervals. RESULTS: The estimated prevalence of alcohol abuse/dependence was 13.1% (95% CI: 8.4;19.9) in men and 4.1% (95% CI: 1.9;8.6) in women. In the final multiple logistic regression model, alcohol abuse/dependence was significantly associated with age, income, schooling, religion and illicit drug use. The adjusted odds ratios were significantly higher in following variables: income between 2,501 and 10,000 dollars (OR=10.29); income above 10,000 dollars (OR=10.20); less than 12 years of schooling (OR=13.42); no religion (OR=9.16) or religion other than Evangelical (OR=4.77); and illicit drug use during lifetime (OR=4.47). Alcohol abuse and dependence patterns were different according to age group. CONCLUSIONS: There is a significantly high prevalence of alcohol abuse/dependence in this population. The knowledge of factors associated with alcohol abuse, and differences in consumption patterns should be taken into account in the development of harm reduction strategies.

Mental health and quality of life in pre- and early adolescents: a school-based study in two contrasting urban areas.

OBJECTIVE: To estimate the prevalence of mental health problems and to assess the quality of life in pre- and early adolescents living in two contrasting urban areas in Brazil, as well as to identify the impact of demographic factors on mental health, quality of life and school performance. METHOD: Using school samples, the Strength and Difficulties Questionnaire and the Quality of Life Inventory were administered to 424 (52%) boys and 387 (48%) girls (mean age 12.6+/-1.3 years) in better-off central and poorer outer-city areas. RESULTS: In the total sample, the prevalence of probable psychiatric cases was 10.1% (n=77). There were no significant differences in the overall prevalence of behavior problems or global quality of life between central and outer-city areas. However, boys from the outer-city had a higher prevalence of conduct problems (12% vs. 6.2%, p=0.04), although girls did not differ significantly on any measure. In general, factors associated with poorer mental health were: having no religion, divorced parents, and being male. CONCLUSIONS: Living in the poorer outer-city was not associated with worse mental health or quality of life in this sample. This is in contrast with the findings of some other studies, and possible protective factors such as female gender and religion are discussed.

Social inequality and common mental disorders.

OBJECTIVE: To analyze the association between the socioeconomic characteristics of individuals and common mental disorders. METHOD: A cross-sectional survey of a representative sample of the urban population, 14 years and older, in Campinas (Brazil) (n=515) was conducted using a multipurpose instrument that included the Self-Reporting Questionnaire (SRQ-20) to assess common mental disorders in the previous 3 months. Weighted prevalence of common mental disorders was calculated for each independent variable. Crude and adjusted prevalence ratios were estimated using Poisson regression. RESULTS: The overall prevalence was 17% (95% CI 12.8-22.3), 8.9% in males and 24.4% in females. An inverse association was found between common mental disorders and the socioeconomic characteristics (schooling and employment) even after controlling for all the other variables. Higher common mental disorders prevalence was observed in those with less than 5 years of schooling (PR=5.5) and unemployed or underemployed (PR=2.0). CONCLUSIONS: As in other studies, common mental disorders were unevenly distributed; it was significantly more frequent in socially disadvantaged individuals. Specific actions to reduce inequalities in the general and mental health system should be studied.

Suicide risk among inpatients at a university general hospital.

OBJECTIVE: To estimate the proportion of inpatients at a university general hospital who are at risk of committing suicide. METHOD: A random sample of 253 patients (57% males) aged 18 years old or older, admitted to surgical and clinical wards, was assessed using the the Mini International Neuropsychiatric Interview, which has a section that evaluates the risk for suicide. Uni- and multivariate analyses were performed. RESULTS: There were 58 (23%) patients with a risk for suicide, 13 (5% of total) of whom presented a high risk. The prevalence of suicide risk was greater in young adult patients, those with no matrimonial relationship and those diagnosed with major depression (univariate analysis, Chi-squared test; p = 0.01, 0.03 and 0.0001, respectively). The multivariate analysis revealed that the risk for suicide in individuals younger than 30 years old was two fold higher than in those individuals between the ages of 30 and 59 years (OR = 0.45, 95% CI = 0.22-0.93; p = 0.03) and four fold greater than in those who were 60 years old or older (OR = 0.25, 95% CI = 0.1-0.64; p = 0.004). CONCLUSION: When young adults are admitted to general hospitals they should receive special attention due to their suicidal potential.

We need to talk about the use of methylphenidate by medical students - review of the literature / Precisamos falar sobre uso de Metilfenidato por estudantes de medicina - revisão da literatura

Abstract: Introduction: Studies methylphenidate (MPH) has been used by medical students to increase their mental activity and improve the performance required during undergraduate school, generating concern regarding the risks to their physical and mental health. This scenario indicates the need for specifically aimed measures in medical schools. Objective: To review the literature about the use of MPH without medical indication amongst medical students. Method: A thorough review of the literature published in English, Spanish, and Portuguese, between 2013 and 2019, based on data made available by Pubmed and Scielo, utilizing keywords in the three above languages, along the four stages of the selection process. Results and Discussion: Altogether, 224 articles were found, of which 25 were selected after reading, dealing with the use of MPH or 'cognition enhancer' by undergraduate medical students without a doctor's prescription. The research indicated significant variability in the frequency of consumption, related to the investigated pattern of use, use with or without indication, before or after entering University and country where the study was carried out. The most frequent justification for the use without medical indication was to attain improvement in academic performance. A lack of research with a fair appraisal of the cognition, behavioral and psychic risks involved, among them addiction and the approach of the topic in medical schools, was noted. Conclusion: The high rates of usage of MPH by medical students aiming at cognitive enhancement strengthens the importance of preventative actions in medical schools. The strategies must consider information concerning the risks of use (of MPH) without medical indication; non-pharmacological interventions for performance improvement; sleep hygiene measures organization for adequate study activities; broad discussions about ethical aspects and curricular structure.

Resumo: Introdução: Estudos mostram que o metilfenidato (MPH) tem sido utilizado por estudantes de medicina para aumentar sua atividade mental e melhorar o desempenho exigido durante a graduação, gerando preocupações quanto aos riscos à sua saúde física e mental. Esse cenário indica a necessidade de medidas especificamente direcionadas nas escolas médicas. Objetivo: Revisar a literatura sobre o uso de MPH sem indicação médica entre estudantes de medicina. Método: Revisão minuciosa da literatura publicada em inglês, espanhol e português, entre 2013 e 2019, com base em dados disponibilizados pelo PUBMED e SCIELO, utilizando palavras-chave nos três idiomas acima, ao longo das quatro etapas do processo de seleção. Resultados e Discussão: Ao todo, foram encontrados 224 artigos, dos quais 25 foram selecionados após leitura, tratando do uso de MPH ou 'potencializador da cognição' por graduandos de medicina sem prescrição médica. A pesquisa indicou variabilidade significativa na frequência de consumo, relacionada ao padrão de uso investigado, uso com ou sem indicação, antes ou após a entrada na Universidade e país onde o estudo foi realizado. A justificativa mais frequente para o uso sem indicação médica foi a de obter melhora no desempenho acadêmico. Notou-se a carência de pesquisas com uma avaliação adequada dos riscos cognitivos, comportamentais e psíquicos envolvidos, entre eles o risco de adição e a abordagem do tópico nas escolas médicas. Conclusão: As altas taxas de uso do MPH por estudantes de medicina visando o aprimoramento cognitivo reforça a importância de ações preventivas nas escolas médicas. As estratégias devem considerar informações sobre os riscos do uso (do MPH) sem indicação médica; intervenções não farmacológicas para melhoria do desempenho cognitivo; medidas de higiene do sono; organização para atividades de estudo adequadas; amplas discussões sobre aspectos éticos e estrutura curricular.