Carregant...
Tipus de document
TesiVersió
Versió publicadaData de publicació
Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/121053
Personality in patients with dual diagnosis: The influence of severe mental illness
Títol de la revista
Autors
ISSN de la revista
Títol del volum
Resum
[eng] Dual Diagnosis (DD) refers to the co-existence of a Severe Mental Illness (SMI) and a Substance Use Disorder (SUD) in the same individual. The comorbid prevalence of these two diagnoses is very common, with Schizophrenia (SZ), Bipolar Disorder (BD), and Major Depressive Disorder (MDD) as the three most prevalent SMI among patients with SUD. The co-existence of SUD and these SMIs includes several clinical characteristics, related to evolution and prognosis, which may complicate a patient`s recovery from both disorders. However, nowadays there is an evident need to carry out studies that provide both theoretical and practical knowledge transferable to the clinical management of patients with DD.
The present study aimed, as the first objective, to study personality characteristics in a sample of patients with SUD taking into account their comorbid SMI. We evaluated a sample of 104 male patients undergoing SUD treatment, considered in three groups according to the comorbid SMI: SZ+ Group (SUD and SZ; N=37), BD+ Group (SUD and BD, N=32), and MDD+ Group (SUD and MDD; N=35). Two instruments were used to measure personality, the Cloninger's Temperament and Character Inventory-Revised (TCI-R) and the Zuckerman-Kuhlman Personality Questionnarie (ZKPQ), both based on psychobiological models. In addition, we explored the influence of the SMI in the relationship among personality and clinical variables related to both SUD and SMI diagnoses.
Our second objective was to explore the influence of DD in the coping strategies used in relation to addiction treatment. SUD treatment represents a challenging situation for all patients, but given DD clinical complications, we studied the possible differential profile in the coping strategies used between patients with SZ+ (the most prevalent diagnosis in our sample) and SUD only. To elucidate the influence of comorbidity, a sample of 89 male patients undergoing treatment for addiction was included and distributed in two groups: SZ+ Group (SUD and SZ; N=39) and SUD Group (SUD only; N=43); these patients were assessed using the Coping Strategies Inventory (CS) from Tobin and completed an exhaustive clinical evaluation as well.
The main personality results indicate that patients with SZ+ are characterized by an increased anxiety and fear of uncertainty (high Harm Avoidance from the TCI-R), difficulties in persevering when facing frustration and fatigue (lower Persistence from TCI-R), and the preference for solitary activities or small groups (lower Sociability from ZKPQ). Our findings suggest that patients with SZ+ are the ones who would especially need strategies to manage negative expectations and anxiety, motivational strategies, and if possible, a gradual incorporation to the group therapy sessions used during SUD treatment.
Regarding personality characteristics for patients with BD+, these are characterized by an exploratory activity in response to novel stimulation, being more impulsive, getting easily bored, and by the willingness to experiment strong emotions for the sake of these types of experiences (high Novelty Seeking from the TCI-R and Impulsivity- Sensation Seeking from the ZKPQ). In addition, BD+ diagnosis is highlighted by a higher level of worries, fears, tension, and general emotional upset (high Neuroticism-Anxiety from the ZKPQ). Therefore, patients with BD+ are the ones who would require a therapeutic approach which emphasizes impulsivity management, as well as, achieving the general activity and stimulation they require.
Finally, considering patients with MDD+, these are characterized by being more pragmatic, realistic, having an unstable self-image, and an erratic world-view (lower Self-transcendence from the TCI-R). Taking also into account that in previous studies a lower Self-transcendence is linked to worse general well-being and dropping-out SUD treatment, it may be suggested that interventions with MDD+ patients could benefit from therapeutic strategies that aim to increase creativity and spirituality, which are both associated with a higher Self-transcendence.
With regards to the main relationships founded among personality and SUD and SMI clinical variables, we observed that such relationships are also influenced by the type of comorbid SMI. Results from the TCI-R indicate that higher scores in Novelty Seeking for patients with BD+ are related to a higher severity of addiction. Harm Avoidance is only linked to clinical variables for patients with SZ+, with a higher Harm Avoidance in patients having a greater presence of negative symptoms and general psychopathology. While Persistence did not show any clinical implications for none of the groups, Self- transcendence only showed clinical implications for the MDD+ group, in which a later age of SUD onset is associated with a lower Self-transcendence. Regarding results from the ZKPQ, we observed a positive relationship between Neuroticism-Anxiety and manic symptoms for patients with BD+, and the number of suicide attempts for patients with SZ+. Lastly, a higher Sociability is related to a later age of SUD onset for patients with SZ+, and to a later age of SMI onset for patients with MDD+.
The study about coping strategies using the CSI in patients with SZ+, revealed that they are less likely to employ Engagement Strategies (Problem Solving and Social Support) and they have a lower self-perceived capacity to cope with treatment, compared with patients with SUD only. Among patients with SZ+, a major use of the Problem Solving strategy is related to a later age of SUD onset, and the self-perceived capacity to cope with treatment is negatively linked to severity of addiction and to positive symptoms. According to normative data, both groups (SUD and SZ+) use the Disengagement Strategy of Self-Criticism frequently; although the use of Self-Criticism was lower for patients with SZ+. Additionally, a higher use of Self-Criticism is related to a higher daily amount of medications for the SZ+ group. Hence, the presence of DD is
associated with a lower use of active coping strategies and points to the need of training problem solving strategies, as well as, abilities to seek for social support during SUD treatment of patients with SZ+. Working on these two strategies could potentially improve treatment adherence and therapeutic outcomes.
In conclusion, the findings of this thesis showed that patients with DD have different personality characteristics depending on their comorbid SMI diagnosis. Moreover, the relationship among personality and SUD and SMI clinical variables is also influenced by the type of SMI. Our findings extend to the DD field previous data about personality dimensions as potential endophenotypes for SZ (high Harm Avoidance) and BD (high impulsivity). Likewise, we observed the potential endophenotypes for developing an addiction (high Novelty Seeking and Impulsivity-Sensation Seeking, which are suggested especially for alcohol SUD) in polydrug users, regardless of the main SUD´s substance and adding nuances according to the comorbid SMI. On the other hand, a lower use of active coping strategies in relation to addiction treatment for patients with SZ+ extends to the DD field previous observations done in patients with SUD only and with SZ. Our data point to the potential usefulness of working different aspects, related to personality and coping, during DD treatment considering the comorbid SMI. However, future research is needed to advance in those lines of research, as well as, to overcome the limitations of our work. Additional studies should include a clinical, personality, and coping assessment, and longitudinal measures combined with objective data such as genetic polymorphisms and functional neuroimaging.
Descripció
Matèries (anglès)
Citació
Citació
MARQUEZ ARRICO, Julia e.. Personality in patients with dual diagnosis: The influence of severe mental illness. [consulta: 29 de novembre de 2025]. [Disponible a: https://hdl.handle.net/2445/121053]