Executive dysfunction and cognitive subgroups in a large sample of euthymic patients with bipolar disorder.

Bipolar disorder (BP), at the group level, is associated with significant but modest cognitive deficits, including executive dysfunction. Among executive functions, response inhibition deficits have been suggested to be particularly relevant to BP. However, BP is associated with significant heterogeneity in neurocognitive performance and level of functioning. Very few studies have investigated neurocognitive subgroups in BP with data-driven methods rather than arbitrarily defined criteria. Other than having relatively small sample sizes, previous studies have not taken into consideration the neurocognitive variability in healthy subjects. Five-hundred-fifty-six euthymic patients with BP and 416 healthy controls were assessed using a battery of cognitive tests and clinical measures. Neurocognitive subgroups were investigated using latent class analysis, based on executive functions. Four neurocognitive subgroups, including a good performance cluster, two moderately low-performance groups, which differ in response inhibition and reasoning abilities, and a severe impairment cluster were found. In comparison to healthy controls, BP patients were overrepresented in severe impairment cluster (27% vs 5.3%) and underrepresented in good performance cluster. BP patients with lower educational attainment and older age were significantly more likely to be members of cognitively impaired subgroups. Antipsychotic use was less common in good performance cluster. These results suggest that there is a considerable overlap of cognitive functions between BP and healthy controls. Neurocognitive differences between BP and healthy controls are driven by a subgroup of patients who have severe and global, rather than selective, cognitive deficits.

Metacognitive beliefs in unipolar and bipolar depression: a comparative study.

AIMS: The purpose of this study was to perform a comparative investigation of metacognitive beliefs regarding pathological worry in patients with unipolar and bipolar depressive disorder. METHODS: Those subjects with acute depressive episodes among patients diagnosed with major depressive disorder (unipolar) or bipolar disorder on the basis of DSM-IV diagnostic criteria (unipolar n = 51, bipolar n = 45), and healthy controls (n = 60), were included in the study. Participants were administered the Meta-Cognitions Questionnaire (MCQ-30) in order to determine metacognitive beliefs. The relationship between metacognitive beliefs and anxiety severity, depression severity and self-esteem in the unipolar and bipolar patients groups was then examined. RESULTS: Scores for negative beliefs about worry concerning uncontrollability and danger and for beliefs about the need to control thoughts were higher in both the unipolar and bipolar depression groups than in the healthy controls (P < 0.05). Lack of cognitive confidence scores were higher in the bipolar group than in the healthy controls (P < 0.05). Metacognitive beliefs (to a greater extent in parameters in the bipolar group) were correlated with anxiety level, depression level and self-esteem in both patient groups. CONCLUSION: In addition to metacognitive beliefs known to be associated with ruminations in unipolar and bipolar depression, metacognitive beliefs can also be seen in association with worry. Worry-associated metacognitive beliefs should be the subject of focus in the identification of metacognitive beliefs in depression patients and in metacognitive therapy in these patients.

Internalized stigma and intimate relations in bipolar and schizophrenic patients: a comparative study.

OBJECTIVE: The aim of this study was to determine characteristics of internalized stigma and intimate relations in bipolar and schizophrenia patients and to compare characteristics of intimate relations in bipolar and schizophrenia patients with or without internalized stigma. METHOD: A total of 228 volunteers were included, 119 patients with bipolar disorder and 109 with schizophrenia. Schizophrenic and bipolar disorder patients were compared in terms of internalized stigma and intimate relations characteristics. Bipolar and schizophrenia patients with and without internalized stigma were compared in terms of characteristics of intimate relations. RESULTS: Internalized stigma was determined in one in three schizophrenia and one in five bipolar patients. Stigma resistance and relational esteem in intimate relations scores were higher in bipolar patients. Relational anxiety/fear of relationship, relational monitoring and external relational control scores were higher in schizophrenia patients with internalized stigma compared to those without, while their relational satisfaction, relational esteem and relational assertiveness scores were lower. Relational anxiety/fear of relationship and relational monitoring scores were higher in bipolar patients with internalized stigma compared to those without, while their relational satisfaction scores were lower. CONCLUSION: Internalized stigma in schizophrenia patients is a well-known subject that has been investigated previously. The results of our study are significant in terms of showing that internalized stigma is also frequent in bipolar disorder patients, and not solely in schizophrenia patients. Stigma resistance is higher in bipolar disorder patients. Internalized stigma is correlated with intimate relations in both bipolar and schizophrenia patients.

Temperament and character traits in patients with bipolar disorder and associations with attempted suicide.

OBJECTIVE: This study was intended to investigate temperament and character traits in bipolar disorder patients with or without a history of attempted suicide. METHODS: One hundred nineteen patients diagnosed with euthymic bipolar disorder based on Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition, Text Revision, and with no accompanying Axis I and II comorbidity, and 103 healthy controls were included. Structured Clinical Interview for Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition, Axis I and II disorders were used to exclude Axis I and II comorbidity. Temperament and character traits of bipolar patients with a history attempted suicide (25.2%, n = 30) or without (74.8%, n = 89) and of the healthy volunteers were determined using the Temperament and Character Inventory. The association between current suicide ideation and temperament and character traits was also examined. RESULTS: Bipolar patients with or without a history of attempted suicide had higher harm avoidance (HA) scores compared with the healthy controls. Persistence scores of bipolar patients with no history of attempted suicide were lower than those of the healthy controls. Self-directedness (SD) scores of the bipolar patients with a history of attempted suicide were lower than those of patients with no such history. Self-transcendence scores of bipolar patients with no history of attempted suicide were lower than those of both the healthy controls and of those patients with a history of attempted suicide. A positive correlation was determined between current suicidal ideation scale scores and HA, and a negative correlation between SD and cooperativeness was determined. CONCLUSIONS: High harm avoidance may be a temperament trait specific to bipolar disorder patients. However, it may not be correlated with attempted suicide in such patients. These may have low persistence, high SD and low self-transcendence temperament and character traits that protect against attempted suicide. Harm avoidance, SD, and cooperativeness may be correlated with current suicidal ideation.