Personality and schizophrenia: psychobiological model and its relationship with comorbidity.

Personality interacts with psychosocial variables, psychopathology and coping strategies of patients with schizophrenia. Psychobiological model of personality is important for schizophrenia as temperament dimensions, except dimension Persistence, have been associated with different neurotransmitter systems. Comorbidity of psychiatric and somatic disorders and syndromes is generally associated with dimensions high Harm avoidance and low Self-directedness. Variations in other dimensions may also be important. High Harm Avoidance may represent state vulnerability marker for various psychiatric disorders and is associated with appearance of comorbidity in schizophrenia. High Self-directedness may be protective factor for development of various psychiatric as well somatic comorbidity states.

Smoking and schizophrenia.

Smoking prevalence for schizophrenic patients is higher than this for general population. More than 60% of schizophrenic patients are current smokers, which contributes to excessive mortality in these patients. The reasons for high frequency of both smoking prevalence and heavy smoking in schizophrenic patients is thought to be at least partially related to enhancement of brain dopaminergic activity, which, in turn, results in behavioral reinforcement due to stimulant effects. Smoking stimulates dopaminergic activity in the brain by inducing its release and inhibiting its degradation. There is also evidence that cigarette smoking can reduce deficits relative to dopamine hypofunction in prefrontal cortex. Recent neuroimaging studies have further contributed the evidence of complex influences of cigarette smoking on brain dopaminergic function. It has been suggested that smoking may be an attempt by schizophrenic patients to alleviate cognitive deficits and to reduce extrapyramidal side-effects induced by antipsychotic medication. Cigarette smoke also increases the activity of CYP 1A2 enzymes, thus decreasing the concentration of many drugs, including clozapine and olanzapine. There is also evidence that smoking is associated with increased clearance of tiotixene, fluphenazine and haloperidol. Given the high frequency of smoking in schizophrenic patients, clinicians need to check smoking status in each patient. Schizophrenic patients who smoke may require higher dosages of antipsychotics than nonsmokers. Conversely, upon smoking cessation, smokers may require a reduction in the dosage of antipsychotics.

Psoriasis, mental disorders and stress.

Etiology of psoriasis is still not known and comprises a range of assumptions and very complex etiological and pathogenetic mechanisms. Along with genetical predisposition, mental disorders and stresses might have a key role in the occurrence of this disease. Total number of 70 patients suffering from psoriasis were included in the investigation. Generally accepted structured clinical interview (SCID - The Structured Clinical Interview for DSM-IV) was applied in diagnostics of mental disorders. Various mental disorders were found in as many as 90% of patients suffering from psoriasis. The most frequent mental disorders were depressive disorder (19.2%), the posttraumatic stress disorder (17.8%), alcoholism (16.4%), adaptation disorder (15.1%), anxiety - depressive disorders (13.7%) and generalized anxious disorder (9.6%). The authors have concluded that in patients with psoriasis both various mental disorders and various stress events are frequent. The results have implied that there is a link between psoriasis on the one hand and various mental disorders and various stressors on the other. The investigation implies that there is a need to improve multidisciplinary approach in diagnostics and treatment of psoriasis and multi disciplinary team should consist of dermatologist, psychiatrist and psychologist.

Association of cholesterol and socio-demographic parameters with suicidality in the male patients with schizophrenia.

Suicidal behavior is a major health risk in schizophrenia. The aim of this study was to evaluate serum cholesterol concentrations and some socio-demographic parameters in suicidal and non-suicidal men suffering from schizophrenia. Results of this study show that there were no differences in socio-demographic parameters between suicidal and non-suicidal schizophrenic patients but there was a difference in the level of cholesterol (lower in suicidal patients). Duration of untreated psychosis was higher in suicidal patients, which could means that suicidality is a process determined by many different factors including time of treatment. Suicidal patients in our study have been more seriously ill than non-suicidal (had higher scores on PANNS and HDRS-17) and we explained these findings by the fact of damage associated to higher time of non-treatment. Our results show that cholesterol has an important role in distinguishing suicidal from non-suicidal patients, which, if confirmed on a higher number of patients and in more studies, may be of considerable clinical significance. Clinical management of suicidal states is based on integrative approach and includes ensuring immediate safety, the use of psychosocial techniques to address depression and psychosocial stressors, and targeted pharmacotherapy for psychotic and depressive symptoms.

[Suicidality among veterans suffering from chronic PTSD treated at Center for Crisis Intervention, Zagreb University Hospital Center]. / Suicidalnost branitelja lijecenih zbog kronicnog PTSP-a u Centru za krizna stanja KBC-a Zagreb.

Recent literature suggests that posttraumatic stress disorder (PTSD) patients are at an increased risk of suicidal behavior. The purpose of our study was to assess the impact of psychiatric comorbidity on suicidality (as assessed by SUAS) and relationship to combat exposure (as assessed by CES) in 277 veterans suffering from chronic PTSD. The diagnosis of PTSD and psychiatric comorbidity was confirmed according to DSM-IV criteria. Patients with PTSD and comorbidity had significantly higher scores (p<0.01) on the measures of suicidality and combat exposure than the groups without psychiatric comorbidity. These findings suggest that persons with PTSD and psychiatric comorbidity are at a higher risk of suicidal behavior. Therefore, on assessing suicide risk in PTSD patients attention should be paid to comorbidity factors, in order to reduce the risk of fatal complications.