Research reportAffective temperaments are associated with specific clusters of symptoms and psychopathology: A cross-sectional study on bipolar disorder inpatients in acute manic, mixed, or depressive relapse
Introduction
Mood disorders are currently categorized in well-defined diagnostic classes within the Diagnostic and Statistical Manual of Mental Disorders (DSM-IV, (APA, 1994) and the tenth edition of the WHO International Classification of Diseases (ICD-10, (WHO, 1992). However, clinical and molecular studies, mostly on therapeutic approaches to the disease, often challenge this view (de Bartolomeis and Perugi, 2012). Indeed, pharmacological targets frequently lie at the crossroads of multiple signaling cascades, putatively implicated in the pathophysiology of several symptom and psychopathological domains relevant to mood disorders (de Bartolomeis et al., 2013, Dell'aversano et al., 2009, Iasevoli et al., 2013, Tomasetti et al., 2011).
It has been suggested that mood disorders may rather belong to a broad bipolar spectrum where individual temperaments, personality and psychopathology merge in multiple complex clinical phenotypes (Akiskal, 2003). According to this view, both the study of individual temperaments in mood disorder patients and the characterization of how they associate with mood-related symptoms have gained increasing attention in recent years. The investigation of individual temperaments has been greatly enhanced by the development of the Temperament Evaluation of Memphis, Pisa, Paris, and San Diego autoquestionnaire (TEMPS-A), which was specifically designed for measuring a range of affective temperaments, i.e. the depressive, anxious, irritable, cyclothymic, and hyperthymic ones (Akiskal and Akiskal, 2005, Akiskal et al., 2005). The use of this instrument has allowed to strongly deepening and refining the subdivision of mood disorders in different clinical forms, with considerable prognostic impact and putative therapeutic implications. It has been observed that the cyclothymic subscale score is elevated in bipolar compared to unipolar depressed patients (Mendlowicz et al., 2005). Cyclothymic temperament may represent a risk factor for bipolarity, possibly predisposing to recurrence and mania even in patients diagnosed with unipolar depression (Mechri et al., 2011). Similar findings have also been reported for the hyperthymic temperament (Evans et al., 2005, Goto et al., 2011). Moreover, TEMPS-A has been utilized in a nonclinical sample to examine the risk of bipolar disorder. In a recent work on 1200 young adult students, a subgroup of 145 participants at risk for bipolar disorder was selected, in order to evaluate their scores on TEMPS-A and on other structured and self-report questionnaires (Walsh et al., 2012). The choice of this sample allowed to explore the association of temperamental traits with symptoms and psychopathological dimensions inherent to bipolar spectrum (Walsh et al., 2012). The same Authors utilized TEMPS-A in another non-clinical sample to investigate the expression of affective temperaments in daily life (Walsh et al., 2013). Therefore, the investigation of affective temperaments may help to better define the type of mood disorder a patient suffers from, with strong prognostic value (Perugi et al., 2011b, Pompili et al., 2012b), and may have predictive value on the risk of developing bipolar spectrum diseases in non-affected subjects (Walsh et al., 2012).
Despite this accumulating body of evidence, the actual value of affective temperaments for predicting mood-related symptoms and general psychopathology as well as for guiding therapeutic choice in mood disorder patients needs further characterization. This aim is even more relevant to bipolar inpatients, since there are only few studies on this population at present.
An evaluation of the association between affective temperaments and multiple psychopathological and personological measures in bipolar disorder type I (BD-I) outpatients pointed out a connection between impulsivity, separation anxiety, and interpersonal sensitivity on one side and both anxiety disorder and cyclothymic temperament on the other side (Perugi et al., 2011a). A similar investigation carried out on BD-I outpatients allowed to isolate two distinct temperamental dispositions in these patients (Perugi et al., 2012). Focusing on inpatient cases, a recent report has investigated the correlations between score factors emerging from the factorial analysis of the Brief Psychiatric Rating Scale (BPRS) and TEMPS-A in BD-I cases, finding support for a reconsideration of mixed state diagnosis (Pacchiarotti et al., 2013).
However, the largest part of studies has focused on outpatients. Thus, an extensive depiction of the interconnections between affective temperaments and symptoms, psychopathology, and therapy in bipolar inpatients remains still elusive, especially for those experiencing an acute relapse and with a potential higher severity of their disease.
Therefore, the aim of this study, which focuses on patients hospitalized for an acute relapse of their mood disorder, was to evaluate whether: (i) predominant affective temperaments according to the TEMPS-A scale could differently distribute throughout DSM-IV mood disorder diagnoses; (ii) TEMPS-A scores and predominant affective temperaments could be predictive of symptomatology and psychopathology; (iii) specific predominant temperaments could be more likely associated with treatment by a specific class of psychiatric drugs.
Section snippets
Study sample
The study was carried out in three Italian centers: the “Villa San Giuseppe” hospital of Ascoli Piceno, the Psychiatric ward of the University “Federico II” of Naples, and the Psychiatric ward of the University “G. d'Annunzio” of Chieti. Inpatients enrolled in this study were those consecutively admitted at these three centers within January and December 2011, upon acute relapse of a primary mood disorder (i.e. BD-I, bipolar disorder-type II [BD-II], bipolar disorder not otherwise specified
Demographics
A total of 129 consecutive mood disorder patients (66 males/63 females), out of 198 mood disorder inpatients screened, were enrolled in the study. Mean age of the sample was 46±9 years. Prevalence rates of diagnoses (both lifetime and current episodes) have been reported in Table 1. Given the low number of patients diagnosed with MDD and SAD, these were excluded in several of the subsequent analysis.
Sex distribution was the only demographic variable that showed significant differences among
Limits of the study
This study has been carried out according to a cross-sectional design. Cross-sectional design allows evaluating associations between clinical conditions and a number of outcomes. However, causative inferences are difficult to trace from this type of studies, since “exposure” (clinical conditions) and “outcomes” are measured simultaneously and their sequencing is impossible to be specifically determined (Jepsen et al., 2004). Indeed, a cross-sectional study is generally used to provide the basis
Conclusion
In conclusion, in this study we have observed that the temperamental state may be predictive of the diagnosis, symptom presentation, and psychopathological conditions of mood disorder patients. However, this clinical dissection by temperaments is not usually followed by temperament-targeted therapeutic interventions. We suggest that a future step in research should be the characterization of pharmacological treatment efficacy and effectiveness based on temperamental states, especially
Role of funding source
All the authors assure that they have no founding source(s) to declare for the present work.
Conflict of interest
All Authors declare they have no current or past conflict of interest for this work.
Acknowledgements
None to declare.
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