Original articleSubthreshold mania as predictor of depression during interferon treatment in HCV+ patients without current or lifetime psychiatric disorders
Introduction
Evidence from a number of studies suggests that the incidence of neuropsychiatric side effects induced by interferon (IFN) treatment in hepatitis-C-virus (HCV)-infected patients ranges between 7% and 35% [1], [2]. Variation in rates across studies depends on many factors, including treatment dosage, inclusion criteria, methods used to assess psychiatric side effects, and type of side effects considered. Despite these variations, there is a general consensus that IFN-induced depressive symptoms are the most common, with an estimated incidence of 23%. Recently, attention has been given to irritability, anxiety, and manic episodes during IFN treatment [3], [4], [5], [6], suggesting that these symptoms are also important neuropsychiatric effects of this treatment. Several studies indicate that patients with a positive psychiatry history are more prone to developing psychiatric side effects during IFN treatment than those without [7], [8]. Moreover, during the previous years, an increasing body of evidence suggests that the presence of subthreshold depressive symptoms before the initiation of IFN therapy is predictive of subsequent depression induced by IFN [9]. Conversely, no attention, to the best of our knowledge, has been given to the potential role of current or lifetime manic–hypomanic symptoms as predictors of depression during IFN treatment. Studies conducted in the general population and in clinical samples suggest the potential clinical significance of these symptoms. Judd and Akiskal [10], in a recent reanalysis of epidemiological catchment area data, have argued that subsyndromal manic symptoms are not ‘benign’ because they are associated with increased service use for mental health problems, need for welfare, and disability benefits. This view is also supported by Akiskal et al. [11], who found that, in a cohort of 559 depressed patients evaluated prospectively up to 11 years, the lifetime presence of soft bipolar temperamental dysregulations was predictive of more severe subsequent depressive episodes and switch to bipolar II disorder.
Instruments used to assess full-blown mania, such as the Bech–Rafaelsen Mania Scale (BRMAS) [12], are available in the literature. In addition to this scale, in the present study, we used the Mood Spectrum Self-Report (MOODS-SR), a broad assessment that includes typical and atypical symptoms of major depression and bipolar disorder; behavioral patterns and other features related to core symptoms that may either be prodromal precursor states or sequelae of a previously expressed disorder; and temperamental or personality traits [13]. Evidence on the clinical utility of mood spectrum assessment has already been provided by Cassano et al. [14], who found a significant relationship between the presence of lifetime manic–hypomanic symptoms and increased suicidal risk in patients with recurrent unipolar depression.
The aim of this prospective study is to determine whether a lifetime history of subthreshold mania constitutes a risk factor for depression during treatment with IFN in HCV-infected patients. The role of trait and state anxiety as a risk factor is also examined. Given that some authors have rightly pointed out that persons with hepatitis C come from population subgroups who carry a high risk of psychiatric disorders [15], we decided to select patients without a previous history of psychiatric disorders to test the hypothesis that subthreshold mania predicts IFN-induced depression.
Section snippets
Study population
For the purpose of this study, we analyzed data derived from a multicenter controlled pilot study on the comparative safety and tolerability of two types of IFN (unpublished data, available upon request).
Naïve patients with chronic HCV infection (Genotype 1, 2, or 3, classified according to Simmonds), of both genders, aged ≥18 years, and with a liver biopsy providing a histological diagnosis of active or persistent chronic hepatitis were screened in three academic Italian centers (Bologna,
Results
Fifty subjects participated in the study, and one refused to participate. One subject was excluded from the analyses because he failed to complete the MOODS-SR at baseline. The study sample therefore included 29 males and 20 females, with a mean age of 49.4 years (S.D.=10.4, range=27–67).
The genotype distribution comprised 65% Genotype 1 and 35% Genotype 2/3.
Twenty-six patients were randomized to LE-IFN-α, and 23 patients were randomized to rIFN-α2b. The characteristics of the two groups are
Discussion
Available literature suggests that IFN is capable of inducing several distinct psychiatric symptoms, which include a depressive syndrome that develops slowly over weeks to months of treatment and, less commonly, manic conditions most often characterized by extreme irritability and agitation, but also occasionally by euphoria [22].
Constant et al. [3] found that IFN-induced mood disorders are frequent (32%) in patients with chronic hepatitis C. Consistently with previous studies, the authors
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