Normal Metabolic Levels in Prefrontal Cortex in Euthymic Bipolar I Patients with and without Suicide Attempts.

Introduction/Objective. Evidence suggests that the prefrontal cortex has been implicated in the pathophysiology of bipolar disorder (BD), but few neurochemical studies have evaluated this region in bipolar patients and there is no information from BD suicide attempters using Proton Magnetic Resonance Spectroscopy (H(+)MRS). The objective was to evaluate the metabolic function of the medial orbital frontal cortex in euthymic BD type I suicide and nonsuicide attempters compared to healthy subjects by H(+)MRS. Methods. 40 euthymic bipolar I outpatients, 19 without and 21 with history of suicide attempt, and 22 healthy subjects were interviewed using the Structured Clinical Interview with the DSM-IV axis I, the Hamilton Depression Rating Scale, the Young Mania Rating Scale, and the Barratt Impulsiveness Scale-11 and underwent H(+)MRS. Results. We did not find any metabolic abnormality in medial orbital frontal regions of suicide and nonsuicide BD patients and BD patients as a group compared to healthy subjects. Conclusions. The combined chronic use of psychotropic drugs with neuroprotective or neurotrophic effects leading to a euthymic state for longer periods of time may improve neurometabolic function, at least measured by H(+)MRS, even in suicide attempters. Besides, these results may implicate mood dependent alterations in brain metabolic activity. However, more studies with larger sample sizes of this heterogeneous disorder are warranted to clarify these data.

Prevalence and clinical correlates of alcohol use disorders among bipolar disorder patients: results from the Brazilian Bipolar Research Network.

OBJECTIVES: To investigate prevalence rates and clinical correlates of alcohol use disorders (AUD) among bipolar disorder (BD) patients in a large sample from the Brazilian Bipolar Research Network. METHODS: Four hundred and eighty-three DSM-IV BD patients, divided according to the presence or absence of a lifetime AUD diagnosis (BD-AUD vs. BD-nonAUD), were included. Demographic and clinical characteristics of these two groups were compared. Logistic regression was performed to identify which characteristics were most strongly associated with a lifetime AUD diagnosis. RESULTS: Nearly 23% presented a lifetime AUD diagnosis. BD-AUD patients were more likely to be male, to present rapid cycling, post-traumatic stress disorder (PTSD), anorexia, other substance use disorders (SUD), family history of SUD, any substance misuse during the first mood episode, history of psychosis, suicide attempts, and younger age at onset of illness than BD-nonAUD patients. Logistic regression showed that the variables most strongly associated with a lifetime AUD diagnosis were SUD (non-alcohol), any substance misuse during the first mood episode, PTSD, male gender, suicide attempt, family history of SUD, and younger age at onset of BD. CONCLUSIONS: BD-AUD patients begin their mood disorder earlier and present more suicidal behaviors than BD-nonAUD patients. Personal and family history of SUD may be good predictors of comorbid AUD among BD patients. These variables are easily assessed in the clinical setting and may help to identify a particularly severe subgroup of BD patients.

Prefrontal gray matter volume in adults bipolar I outpatients is associated with history of suicide attempts?

ABSTRACT Background: Patients with Bipolar Disorder (BD) have the highest lifetime risk for suicidal behavior (SB) compared to other psychiatric disorders. Neuroimaging research provides evidence of some structural and functional abnormalities in the brain of BD suicide attempters (SA), but interpretation of these findings may represent a number of features. Objective: The purpose of this study was to evaluate the volume of the prefrontal cortex in euthymic BD type I outpatients, with and without history of SA. Methods: 36 euthymic BD I outpatients (18 with and 18 without suicide attempt history) were underwent structural MRI and total and regional gray matter volumes were assessed and compared with 22 healthy controls (HC). Results: We did not found any differences in all areas between suicidal and non-suicidal BD I patients and BD patients as a group compared to HC as well. Discussion: our findings suggest that can be a different subgroups of patients in relation to prefrontal cortex volumes according to some clinical and socio-demographic caractheristics, such as number of previous episodes and continuous use of medical psychotropic drugs that may induce neuroplasticity phenomena, which restore cerebral volume and possibly can lead to long-term euthymia state.

The impacts of cognitive-behavioral therapy on the treatment of phobic disorders measured by functional neuroimaging techniques: a systematic review.

OBJECTIVE: Functional neuroimaging techniques represent fundamental tools in the context of translational research integrating neurobiology, psychopathology, neuropsychology, and therapeutics. In addition, cognitive-behavioral therapy (CBT) has proven its efficacy in the treatment of anxiety disorders and may be useful in phobias. The literature has shown that feelings and behaviors are mediated by specific brain circuits, and changes in patterns of interaction should be associated with cerebral alterations. Based on these concepts, a systematic review was conducted aiming to evaluate the impact of CBT on phobic disorders measured by functional neuroimaging techniques. METHODS: A systematic review of the literature was conducted including studies published between January 1980 and April 2012. Studies written in English, Spanish or Portuguese evaluating changes in the pattern of functional neuroimaging before and after CBT in patients with phobic disorders were included. RESULTS: The initial search strategy retrieved 45 studies. Six of these studies met all inclusion criteria. Significant deactivations in the amygdala, insula, thalamus and hippocampus, as well as activation of the medial orbitofrontal cortex, were observed after CBT in phobic patients when compared with controls. CONCLUSION: In spite of their technical limitations, neuroimaging techniques provide neurobiological support for the efficacy of CBT in the treatment of phobic disorders. Further studies are needed to confirm this conclusion.

Is there an association between suicide attempt and delay of initiation of mood stabilizers in bipolar I disorder?

BACKGROUND: Little is known about the extent to which delay of initiation of mood-stabilizing treatment may influence outcomes in bipolar patients (BP). In this study, our aim was to investigate the association between delay of mood stabilizer treatment in bipolar patients and lifetime history of suicide attempts. METHOD: A consecutive sample of 268 bipolar I outpatients from two teaching hospitals in Brazil was recruited. The assessment included a socio-demographic history form, a clinical interview regarding clinical variables and the Structured Clinical Interview for DSM-IV. Participants were divided into three groups: BP that initiated the first mood stabilizer in the same year of the first episode of the disease (FMS≤1), between 1 and 5 years after the first episode of the disease (15). RESULTS: The mean time from the first episode until the first mood stabilizer medication was 8.6 years (SD 9.8 years). The FMS>5 group, showed a higher lifetime prevalence of suicide attempts than the other two groups (PR=1.75, 95% CI: 1.24-2.47), p=0.001. These results remained significant after adjusting for potential confounders, (PR=1.82, 95% CI: 1.29-2.60), p=0.001. LIMITATIONS: This study evaluated patients retrospectively and does not permit a cause-effect relationship. CONCLUSION: The present study supports the importance of early diagnosis and early intervention for BP in order to limit the potentially lethal impact of the disease.

Prevalence and clinical impact of eating disorders in bipolar patients.

OBJECTIVES: To study the impact of eating disorders (EDs) on the severity of bipolar disorder (BD). METHODS: The Structured Clinical Interview for DSM-IV Axis I (SCID-I), Young Mania Rating Scale (YMRS), Hamilton Depression Rating Scale (HAM-D-17), Hamilton Anxiety Rating Scale (HAM-A), Global Assessment of Functioning (GAF), Clinical Global Impression (CGI), and the World Health Organization Quality of Life Assessment (WHOQOL-BREF) were used. Clinical and sociodemographic data were also collected. RESULTS: Among the 356 bipolar patients included in this study, 19 (5.3%) were also diagnosed with ED. Of these, 57.9% had bulimia nervosa (BN) and 42.1% had anorexia nervosa (AN). Among ED patients, 94.7% were female. Bipolar patients with EDs presented with lower scores in the mental health domain of the WHOQOL-BREF, higher scores of depressive symptoms, and more psychiatric comorbidities. CONCLUSIONS: ED comorbidities imposed important negative outcomes in bipolar patients. This finding suggests that attention should be given to the presence of EDs in BD patients and that better treatments focused on this population should be developed.

Reduced posterior corpus callosum area in suicidal and non-suicidal patients with bipolar disorder.

BACKGROUND: Impulsivity is a characteristic of bipolar disorder (BD) that can contribute to the risk for suicidal behavior. Evidence suggests that gray and white matter abnormalities are linked with impulsivity, but little is known about the association between corpus callosum (CC) and impulsivity in BD. We examined the CC area and impulsivity in euthymic bipolar I patients, with and without lifetime history of suicide attempts, and in healthy controls. METHODS: Nineteen bipolar patients with a suicide attempt history (BP-S), 21 bipolar patients without suicide attempt history (BP-NS), and 22 healthy controls (HC) underwent clinical assessment by the Structured Clinical Interview with the DSM-IV axis I (SCID-I), the Barratt Impulsiveness Scale (BIS-11), and MRI scan. RESULTS: No differences were observed for any CC subregion between BP-S and BP-NS groups. There was a significant reduction in the genu (p=0.04) and isthmus areas (p=0.01), in bipolar patients compared with HC. In the BP-S group, the BIS-11 total (p=0.01), attention (p=0.001) and non-planning (p=0.02) impulsivity scores were significantly higher than in the BP-NS and HC groups. LIMITATIONS: These results cannot establish causality because of the cross-sectional nature of the study. CONCLUSION: This report potentially provides evidence that a reduction in the CC area is present even in non-symptomatic bipolar patients, which may be evidence of a biological trait marker for BD. Furthermore, the study demonstrated that BP-S group had higher impulsivity even during euthymia, which points to a sustained association between lifetime history of suicide attempts and impulsivity in BD.

Relationship between structural abnormalities in the cerebellum and dementia, posttraumatic stress disorder and bipolar disorder.

New evidence suggests that the cerebellum has structural and functional abnormalities in psychiatric disorders. OBJECTIVE: In this research, the goal was to measure the volume of the cerebellum and its subregions in individuals with psychiatric disorders and to relate these findings to their symptoms. METHODS: Patients with different degrees of cognitive impairment (Epidemiology of the Elderly - UNIFESP) and patients with post-traumatic stress disorder (PTSD) from population studies were analyzed. Also, patients with bipolar disorder from an outpatient clinic (Center for the Study of Mood and Anxiety Disorders, Universidade Federal da Bahia) were recruited for this study. All subjects underwent a 1.5T structural magnetic resonance scan. Volumetric measures and symptom measurements, by psychometric scales, were performed and compared between patients and controls. RESULTS: The cerebellum volume was reduced in patients with cognitive impairment without dementia and with dementia, in patients with PTSD, and in patients with bipolar disorder compared to controls. In dementia and PTSD, the left cerebellar hemisphere and vermis volume were reduced. In bipolar disorder, volumes of both hemispheres and the vermis were reduced. In the first two studies, these cerebellar volumetric reductions correlated with symptoms of the disease. CONCLUSION: The exact nature of cerebellar involvement in mental processes is still not fully understood. However, abnormalities in cerebellar structure and its functions have been reported in some of these diseases. Future studies with larger samples are needed to clarify these findings and investigate whether they are important for treatment and prognosis.

Novas evidências sugerem que o cerebelo apresenta alterações estruturais e funcionais nos transtornos psiquiátricos. OBJETIVO: Medir o volume do cerebelo e de suas sub-regiões em indivíduos portadores de transtornos psiquiátricos e relacionar tais achados aos sintomas. MÉTODOS: Foi realizada a identificação de pacientes com diferentes graus de prejuízo cognitivo proveniente de um estudo populacional (Epidemiologia do Idoso - UNIFESP), pacientes com transtorno do estresse pós-traumático proveniente de outro estudo populacional e portadores de transtorno bipolar proveniente de um ambulatório especializado (Universidade Federal da Bahia). Todos os sujeitos foram submetidos à ressonância magnética estrutural de 1.5T. As medidas de volume, assim como os sintomas medidos por escalas psicométricas foram comparadas entre pacientes e controles. RESULTADOS: Foi observado que o volume do cerebelo está reduzido nos portadores de prejuízo cognitivo sem demência e com demência, no transtorno do estresse pós-traumático e no transtorno bipolar quando comparados aos controles. Na demência e no transtorno do estresse pós-traumático o volume do hemisfério cerebelar esquerdo e do vérmis estão reduzidos. No transtorno bipolar os volumes de ambos os hemisférios e do vérmis estão reduzidos. Nos dois primeiros estudos estas reduções correlacionaram com os sintomas. CONCLUSÃO: A natureza exata do envolvimento do cerebelo nos processos mentais ainda não é compreendida. Entretanto, anormalidades na estrutura cerebelar e em suas funções têm sido relatadas em algumas dessas doenças. Pesquisas futuras, com amostras maiores, ainda são necessárias para esclarecer tais achados e investigar se são importantes para o tratamento e prognóstico.

The identification of unipolar mania subtype based on anxiety comorbidity.

BACKGROUND: Unipolar mania is a controversial topic. Clinical research has focused on establishing specific characteristics that allow it to be distinguished from bipolar disorder (BD). METHODS: Experienced and carefully trained clinicians evaluated a clinical sample of 298 patients with bipolar disorder using structured instruments to analyze the clinical and socio-demographics differences between people with manic episodes over the course of a 15-year illness compared with participants with histories of manic and depressive episodes. RESULTS: According to adopted criteria, 16 (5.6%) participants presented unipolar mania (UM) and 282 participants presented manic and depressive (MD) phases. UM patients reported significantly more hospitalizations and medications, as well as more frequent psychosis at the first episode in the UM group than compared to the MD group. The UM group showed worse overall functioning, although differences in mood status between groups were not identified. Comorbid anxiety disorders and anxiety symptoms occurred significantly less frequently in the UM group. LIMITATIONS: Because of the cross-sectional design, determining causal relationships was not possible. Furthermore, the retrospective nature of the UM diagnosis could not exclude a future depressive episode. CONCLUSIONS: The presence of anxiety disorders can differentiate patients with unipolar mania from those with bipolar mania.

The impact of comorbid posttraumatic stress disorder on bipolar disorder patients.

BACKGROUND: Available data regarding posttraumatic stress disorder (PTSD) in bipolar disorder (BD) are scarce and usually from a limited sample size. The present report was carried out using the Brazilian Research Consortium for Bipolar Disorders and aimed to examine whether patients with BD and comorbid PTSD are at an increased risk for worse clinical outcomes. METHODS: A consecutive sample of bipolar I outpatients from two teaching hospitals in Brazil was recruited. Patients were assessed using the Structured Clinical Interview for DSM-IV, Young Mania Rating Scale, 17-item Hamilton Rating Scale for Depression, and quality of life instrument WHOQOL-BREF. Participants were divided into three groups: a. bipolar patients with PTSD, b. bipolar patients exposed to trauma without PTSD, and c. bipolar patients with no trauma exposure. RESULTS: Of the 405 patients who consented to participate, 87.7% completed the survey. All three groups were similar in terms of demographic parameters. The group with comorbid PTSD reported worse quality of life, more rapid cycling, higher rates of suicide attempts, and a lower likelihood of staying recovered. LIMITATIONS: The cross-sectional design excludes the opportunity to examine causal relationships among trauma, PTSD, and BD. CONCLUSIONS: The findings indicate that PTSD causes bipolar patients to have a worse outcome, as assessed by their lower likelihood to recover, elevated proportion of rapid cycling periods, increased risk of suicide attempts, and worse quality of life.

Lower rates of comorbidities in euthymic bipolar patients.

OBJECTIVE: This study assessed the frequency of axis I psychiatric comorbidities in euthymic bipolar patients and the clinical differences between patients with and without comorbidities. METHOD: In this study, 62 euthymic bipolar outpatients assessed using a clinical questionnaire underwent a structured diagnostic interview (SCID/CV-DSM-IV) as well as a symptoms evaluation (YMRS and HAM-D-17). RESULTS: The lifetime frequency of patients with comorbidities was 27.4%. The most frequent comorbidities were anxiety disorders (33.7%), and the positive associated variables were more advanced age, the presence of a steady partner, a first episode of the depressive type and lifetime attempted suicide. CONCLUSIONS: The lower frequency of comorbidities found in our study in comparison with those described in the literature may be due to the evaluation restricted only to euthymic patients. This suggests the importance of assessing psychiatric comorbidity in bipolar individuals while not in acute phases of the disorder.

Comportamento suicida no transtorno afetivo bipolar e características sociodemográficas, clínicas e neuroanatômicas associadas / Suicidal behavior in bipolar affective disorder and socio-demographic, clinical and neuroanatomical characteristics associated

CONTEXTO: Pacientes com transtorno bipolar possuem risco maior de suicídio, quando comparados com a população geral e com outros transtornos psiquiátricos. Este artigo tem como objetivo revisar os aspectos sociodemográficos, clínicos e neuroanatômicos associados ao comportamento suicida em pacientes com transtorno bipolar com história de tentativa de suicídio. MÉTODOS: Revisão não sistemática da literatura, por meio dos indexadores eletrônicos: PsycoInfo, Lilacs,Medline e PubMed, utilizando-se as palavras-chave: "attempt suicide", "suicidal behavior", "suicide", "bipolar disorder", "suicide risk factor", "neuroimaging" e "suicide neurobiology". RESULTADOS: Diversas características sociodemográficas e clínicas têm sido associadas às tentativas de suicídio em pacientes bipolares, porém os resultados são ainda conflitantes. Em relação aos achados de neuroimagem, os dados também são escassos e inconsistentes. Destes, a hiperintensidade periventricular em substância branca e as alterações na estrutura e função do córtex pré-frontal são os mais descritos. CONCLUSÕES: Considerando que o suicídio é uma causa potencialmente evitável de morte, a compreensão dos correlatos clínicos e neurobiológicos do comportamento suicida pode ser útil na prevenção desse comportamento. Sendo assim, estudos que avaliem melhor os fatores de risco para o comportamento suicida nessa população são necessários.

BACKGROUND: Bipolar patients have a higher risk of suicide when compared with the general population and other psychiatric disorders. The aim of this article is to review the social-demographic, clinical and neuroanatomical aspects of suicidal behavior in bipolar patients. METHODS A non-systematic review of literature through PsycoInfo, Lilacs, Medline and PubMed eletronic databases was conducted, using the keywords: "suicide attempt", "suicidal behavior", "suicide" "bipolar disorder", "suicide risk factor," "neuroimaging", and "suicide neurobiology." RESULTS: Several clinical and sociodemographics characteristics have been associated with suicide attempts in bipolar patients, but results are conflicting. Regarding to neuroimaging, the data are rare, and the results are inconsistent, with reports of white matter hyperintensities and changes in structure and function of the prefrontal cortex. DISCUSSION: Given that suicide is a potentially preventable cause of death, the understanding of neurobiological and clinical correlates of suicidal behavior can be useful in reducing rates of attempt suicide in bipolar patients.

The impacts of cognitive-behavioral therapy on the treatment of phobic disorders measured by functional neuroimaging techniques: a systematic review

Objective: Functional neuroimaging techniques represent fundamental tools in the context of translational research integrating neurobiology, psychopathology, neuropsychology, and therapeutics. In addition, cognitive-behavioral therapy (CBT) has proven its efficacy in the treatment of anxiety disorders and may be useful in phobias. The literature has shown that feelings and behaviors are mediated by specific brain circuits, and changes in patterns of interaction should be associated with cerebral alterations. Based on these concepts, a systematic review was conducted aiming to evaluate the impact of CBT on phobic disorders measured by functional neuroimaging techniques. Methods: A systematic review of the literature was conducted including studies published between January 1980 and April 2012. Studies written in English, Spanish or Portuguese evaluating changes in the pattern of functional neuroimaging before and after CBT in patients with phobic disorders were included. Results: The initial search strategy retrieved 45 studies. Six of these studies met all inclusion criteria. Significant deactivations in the amygdala, insula, thalamus and hippocampus, as well as activation of the medial orbitofrontal cortex, were observed after CBT in phobic patients when compared with controls. Conclusion: In spite of their technical limitations, neuroimaging techniques provide neurobiological support for the efficacy of CBT in the treatment of phobic disorders. Further studies are needed to confirm this conclusion. .

Prevalence and clinical impact of eating disorders in bipolar patients / Prevalência e impacto clínico dos transtornos alimentares sobre os pacientes bipolares

OBJECTIVES: To study the impact of eating disorders (EDs) on the severity of bipolar disorder (BD). METHODS: The Structured Clinical Interview for DSM-IV Axis I (SCID-I), Young Mania Rating Scale (YMRS), Hamilton Depression Rating Scale (HAM-D-17), Hamilton Anxiety Rating Scale (HAM-A), Global Assessment of Functioning (GAF), Clinical Global Impression (CGI), and the World Health Organization Quality of Life Assessment (WHOQOL-BREF) were used. Clinical and sociodemographic data were also collected. RESULTS: Among the 356 bipolar patients included in this study, 19 (5.3 percent) were also diagnosed with ED. Of these, 57.9 percent had bulimia nervosa (BN) and 42.1 percent had anorexia nervosa (AN). Among ED patients, 94.7 percent were female. Bipolar patients with EDs presented with lower scores in the mental health domain of the WHOQOL-BREF, higher scores of depressive symptoms, and more psychiatric comorbidities. CONCLUSIONS: ED comorbidities imposed important negative outcomes in bipolar patients. This finding suggests that attention should be given to the presence of EDs in BD patients and that better treatments focused on this population should be developed.

OBJETIVO: Estudar a influência dos transtornos alimentares (TA) na gravidade do transtorno bipolar (TB). MÉTODOS: Foram utilizadas a Entrevista Clínica Estruturada para o Eixo I do DSM-IV (SCID-I), a Escala de Young para Avaliação da Mania (YMRS), a Escala de Hamilton para Avaliação da Depressão (HAM-D-17), a Escala de Hamilton para Avaliação da Ansiedade (HAM-A), a Avaliação do Funcionamento Global (GAF) e a Escala Breve de Avaliação da Qualidade de Vida da Organização Mundial da Saúde (WHOQOL-BREF). Os dados clínicos e sociodemográficos também foram coletados. RESULTADOS: Entre os 355 pacientes com TB incluídos neste estudo, 19 (5,3 por cento) também foram diagnosticados como portadores de TA. Destes, 57,9 por cento tinham bulimia nervosa (BN) e 42,1 por cento anorexia nervosa (AN). Dentre os pacientes com TA, 94,7 por cento eram do gênero feminino. Os pacientes portadores de TB e TA apresentaram escores mais baixos do domínio saúde mental da WHOQOL-BREF, escores mais elevados de sintomas depressivos e mais comorbidades psiquiátricas. CONCLUSÕES: A presença de comorbidades com TA acarreta importantes desfechos negativos em pacientes bipolares. Este achado sugere que atenção deva ser dada à presença de TA em pacientes com TB e que melhores tratamentos focados nessa população sejam desenvolvidos.

Relationship between structural abnormalities in the cerebellum and dementia, posttraumatic stress disorder and bipolar disorder / Relação entre a alterações estuturais do cerebelo e demência, transtorno do estresse pós-traumáticoe transtorno bipolar

New evidence suggests that the cerebellum has structural and functional abnormalities in psychiatric disorders.Objective: In this research, the goal was to measure the volume of the cerebellum and its subregions in individuals with psychiatric disorders and to relate these findings to their symptoms. Methods: Patients with different degrees of cognitive impairment (Epidemiology of the Elderly - UNIFESP) and patients with post-traumatic stress disorder (PTSD) from population studies were analyzed. Also, patients with bipolar disorder from an outpatient clinic (Center for the Study of Mood and AnxietyDisorders, Universidade Federal da Bahia) were recruited for this study. All subjects underwent a 1.5T structural magnetic resonance scan. Volumetric measures and symptom measurements, by psychometric scales, were performed and compared between patients and controls. Results: The cerebellum volume was reduced in patients with cognitive impairment with out dementia and with dementia, in patients with PTSD, and in patients with bipolar disorder compared to controls. In dementia and PTSD, the left cerebellar hemisphere and vermis volume were reduced. In bipolar disorder, volumes of both hemispheres and the vermis were reduced. In the first two studies, these cerebellar volumetric reductions correlated with symptoms of the disease. Conclusion: The exact nature of cerebellar involvement in mental processes is still not fully understood. However, abnormalities in cerebellar structure and its functions have been reported in some of these diseases. Future studies with larger samples are needed to clarify these findings and investigate whether they are important for treatment and prognosis.

Novas evidências sugerem que o cerebelo apresenta alterações estruturais e funcionais nos transtornos psiquiátricos. Objetivo: Medir o volume do cerebelo e de suas sub-regiões em indivíduos portadores de transtornos psiquiátricos e relacionar tais achados aos sintomas. Métodos: Foi realizada a identificação de pacientes com diferentes graus de prejuízo cognitivo proveniente de um estudo populacional (Epidemiologia do Idoso - UNIFESP), pacientes com transtorno do estresse pós-traumático proveniente de outro estudo populacional e portadores de transtorno bipolar proveniente de um ambulatório especializado (Universidade Federal da Bahia). Todos os sujeitos foram submetidos à ressonância magnética estrutural de 1.5T. As medidas de volume, assim como os sintomas medidos por escalas psicométricas foram comparadas entre pacientes e controles. Resultados: Foi observado que o volume do cerebelo está reduzido nos portadores de prejuízo cognitivo sem demência e com demência, no transtorno do estresse pós-traumáticoe no transtorno bipolar quando comparados aos controles. Na demência e no transtorno do estresse pós-traumático ovolume do hemisfério cerebelar esquerdo e do vérmis estão reduzidos. No transtorno bipolar os volumes de ambos os hemisférios e do vérmis estão reduzidos. Nos dois primeiros estudos estas reduções correlacionaram com os sintomas.Conclusão: A natureza exata do envolvimento do cerebelo nos processos mentais ainda não é compreendida. Entretanto, anormalidades na estrutura cerebelar e em suas funções têm sido relatadas em algumas dessas doenças. Pesquisas futuras, com amostras maiores, ainda são necessárias para esclarecer tais achados e investigar se são importantes parao tratamento e prognóstico.