Posttraumatic stress symptoms, dissociation, and alexithymia in an Italian sample of flood victims
Authors Craparo G, Gori A, Mazzola E, Petruccelli I, Pellerone M, Rotondo G
Received 15 September 2014
Accepted for publication 17 October 2014
Published 28 November 2014 Volume 2014:10 Pages 2281—2284
Checked for plagiarism Yes
Review by Single-blind
Peer reviewer comments 3
Editor who approved publication: Dr Roger Pinder
Giuseppe Craparo,1 Alessio Gori,2 Elvira Mazzola,1 Irene Petruccelli,1 Monica Pellerone,1 Giuseppe Rotondo3
1Faculty of Human and Social Sciences, Kore University of Enna, Enna, Italy; 2Department of Psychology, University of Florence, Florence, Italy; 3Department of Psychology, Unit of Psychotraumatology, San Raffaele Giglio Hospital of Cefalù, Cefalù, Italy
Background: Several studies have demonstrated a significant association between dissociation and posttraumatic symptoms. A dissociative reaction during a traumatic event may seem to predict the later development of posttraumatic stress symptoms. Moreover, several researchers also observed an alexithymic condition in a variety of traumatized samples.
Methods: A total of 287 flood victims (men =159, 55.4%; women =128, 44.6%) with an age range of 17–21 years (mean =18.33; standard deviation =0.68) completed the following: Impact of Event Scale–Revised, Dissociative Experiences Scale II, Twenty-Item Toronto Alexithymia Scale, and Peritraumatic Dissociative Experiences Questionnaire.
Results: We found significant correlations among all variables. Linear regression showed that peritraumatic dissociation plays a mediator role between alexithymia, dissociation, and posttraumatic stress symptoms.
Conclusion: Our results seem to confirm the significant roles of both dissociation and alexithymia for the development of posttraumatic symptoms.
Keywords: peritraumatic dissociation, posttraumatic symptoms, PTSD
Various traumatic experiences, such as a hurricane, earthquake, or traffic accident, may lead to the development of posttraumatic stress (PTS) syndromes. Several studies have recognized the significant role of pathological dissociation in the development of posttraumatic symptoms in traumatized individuals. For example, a meta-analysis performed by Lensvelt-Mulders et al1 confirmed the existence of a positive relation between peritraumatic dissociation and PTS later in life, with an effect size of 0.401. According to these authors, although
This outcome suggests that experiencing dissociation during or shortly after a potentially traumatizing event increases the probability of PTS later in life, this should not be interpreted as proof for a causal relationship.1
On the contrary, Murray et al2 in investigating the relation between dissociative symptoms before, during, and after a trauma in two samples of 27 and 176 road traffic accident survivors found that persistent dissociation was a significant predictor of PTS symptoms. This controversial fact is complicated by those who maintain that dissociative reaction to an acute and severe traumatic event is related to alexithymia.3,4 For example, Monson et al5 in a total of 85 participants diagnosed with military-related posttraumatic stress disorder (PTSD), found that negative affectivity and alexithymic externally oriented thinking predicted PTSD symptoms.
The aim of our study was to evaluate interrelations among posttraumatic symptoms, alexithymia, dissociation, and peritraumatic dissociation in a sample of flood victims. Another aim was to investigate predictors of posttraumatic symptoms measured with the Impact of Event Scale–Revised (IES-R).
Participants and procedure
There were 287 participants (men =159, 55.4%; women =128, 44.6%) with an age range of 17–21 years (mean =18.33; standard deviation [SD] =0.68). The mean age of men was 18.47 years (SD =0.68), and that of women was 18.14 years (SD =0.64); mean ages were statistically different (t=4.253; df=285, P<0.001).
We randomly recruited a group of Italian victims of natural disaster (floods and mudslides) in 2009 in the city of Messina (Sicily, Italy). Self-reports were administered 27 months after the natural catastrophe.
Dissociative Experiences Scale II
The Dissociative Experiences Scale II (DES-II) is a 28-item self-report measure of psychological dissociation that is designed to be used as a screening instrument for dissociative disorders and to help determine the contribution of dissociation to psychiatric disorders. It has demonstrated good psychometric properties, such as adequate split-half reliability and test–retest reliability, as well as good convergent and discriminant validity.6 The Italian translation (Schimmenti et al, unpublished data, 2011) of the DES-II showed good internal consistency, good test–retest reliability, and good convergent validity in a mixed clinical and nonclinical sample. The Italian version of the DES-II showed good internal consistency (α=0.85).
Twenty-Item Toronto Alexithymia Scale
The Twenty-Item Toronto Alexithymia Scale (TAS-20) is a 20-item self-report measure. Items are rated on a five-point Likert scale ranging from 1 (strongly disagree) to 5 (strongly agree). The TAS-20 is composed of three factors: 1) difficulty modulating and identifying feelings (DIF); 2) difficulty describing one’s feelings to others (DDF); and 3) externally oriented thinking (EOT). Cutoff scores are as follows: ≤50= no alexithymia, 51–60= borderline alexithymia, and ≥61= alexithymia.7 The Italian version8 of the TAS-20 has good internal consistency (α=0.81).
Impact of Event Scale – Revised
The Impact of Event Scale – Revised (IES-R) is a 22-item self-report used to assess the presence of posttraumatic syndromes. Items are rated on a five-point Likert scale ranging from 0 (not at all) to 4 (extremely). This scale is composed of three subscales: avoidance, intrusion, and hyperarousal.9 The Italian version10 of the IES-R presents good internal consistency (intrusion, α=0.78; avoidance, α=0.72; and hyperarousal, α=0.83).
Peritraumatic Dissociative Experiences Questionnaire
The Peritraumatic Dissociative Experiences Questionnaire (PDEQ) is a ten-item self-report used to assess the presence of dissociative symptoms during or immediately after a traumatic event. Items are rated on a five-point Likert scale ranging from 1 (not at all true) to 5 (extremely true).11 The Italian version (Craparo et al, unpublished data, 2013) of the PDEQ presents good internal consistency (α=0.81).
Descriptive statistics were calculated for all participants. We used Pearson’s coefficients to assess correlations among all the variables in our study. Linear regressions were calculated to examine predictors of posttraumatic syndromes. All analyses were conducted with SPSS 19.0.
Table 1 shows mean scores and SDs for all variables.
The Pearson’s correlation coefficients among variables showed significant associations of IES-R and its three factors (avoidance, intrusion, hyperarousal) with TAS-20 and its two factors (DIF and DDF), PDEQ, and DES-II (Table 2).
From the linear regression results (stepwise method) performed with IES-R as a dependent variable, PDEQ was found to explain 43.9% of the IES-R total score variance (beta unstandardized coefficient [B]=1.31, standard error [SE]=0.088, β=0.664, t=14.95, P<0.001).
A second linear regression (stepwise method) was performed with peritraumatic dissociation as a dependent variable, and with both alexithymia and dissociation as independent variables. Data showed that a model composed of DIF, EOT, and DES-II explained 27.3% of the PDEQ score variance (Table 3).
Our study confirmed that peritraumatic dissociation is a significant predictor of PTS. In accordance with literature,12 pathological effects of dissociative reaction during a traumatic event seems to be significantly related to both dissociation and alexithymia. Specifically, DIF and dissociation are good predictors of peritraumatic dissociation, whereas EOT was a moderate predictor. We agree with those who consider the therapeutic implications of the association between alexithymia and PTS to be relevant. However, we believe that this association has to be focused on the first factor of the TAS-20: DIF. In fact, according to some authors,13–15 this alexithymic factor represents the core difficulty in modulating affects. Moreover, in accordance with the literature about relation between alexithymia and dissociation, we believe that a traumatic event may cause a pathological reaction in individuals with a preexistent tendency to use the dissociation in a maladaptive way. From this point of view, we agree with those who consider alexithymia, and DIF, as a manifestation of dissociation of affects. Thus, we might suppose that, in our sample, peritraumatic dissociation is a maladaptive defense mechanism to modulate dissociated emotions.16
Limitations of our study include its correlational design and the use of only self-report measures. Future research should use clinical interviews to gather additional information on the psychopathological dimensions related to PTS symptoms.
The authors report no conflicts of interest in this work.
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