A retrospective observational study investigating the relationship between somatisation and pain perception in subjects with intractable pain

Role of Personality and Psychiatric Disorders in the Perception of Pain

Although previous studies have shown that psychiatric and personality disorders are more prevalent in chronic pain than in pain-free groups, few studies have investigated the prevalence of personality disorders (PerDs) in patients with chronic pain with and without a psychiatric comorbidity. The aim of the present study was therefore designed to investigate the burden of PerDs on the prevalence and perception of chronic pain in patients with and without psychiatric comorbidity. 232 patients from the Gift Institute for Integrative Medicine in Pisa, Italy, of which n = 161 (69.4%) were patients with chronic pain, were administered the SCID II for personality disorders and MINI for DSM IV-TR criteria. Both psychiatric and personality disorders were more prevalent in the chronic pain group than in the pain-free group (χ2 = 5.9, p = .015, φ = .16; χ2 = 7.2, p = .007, φ = .18). Cluster A and C PerDs were more prevalent in patients with chronic pain than in subjects without pain (χ2 = 8.1, p = .004, φ = .19; χ2 = 4.7, p = .030, φ = .14, respectively). Unlike Cluster C PerDs, however, Cluster A PerDs were more prevalent in the absence of psychiatric comorbidity (χ2 = 5.0, p = .024, φ = .29), and by themselves worsened the pain perceived. An appropriate PerD diagnosis can be helpful in the treatment of patients with chronic pain.

Men, Chronic Pain, and Prescription Pain Medication Use: The Role of Gender Role Beliefs in a Longitudinal Moderated Mediation Model

OBJECTIVE

Although past research has established that men with chronic pain are more likely to misuse prescription pain medications in a myriad of ways compared with women, little is known about men's medication use in the context of their gender role beliefs. The aim of the present study was to examine the role of men's domestic gender role beliefs on their use of prescription pain medication for chronic pain.

METHODS

Using a nationally representative data set with 304 men with chronic pain, this study examined a longitudinal moderated mediation model in which pain interference mediates the longitudinal relationship between somatic amplification and prescription pain medication use, with domestic gender role beliefs as a moderator of the aforementioned mediated relationship.

RESULTS

Results indicated a significant moderated mediation model in which pain interference fully mediated the relationship between somatic amplification and prescription pain medication use, with men's domestic gender role beliefs moderating this mediated relationship. Specifically, domestic gender role beliefs moderated the relationship between pain interference and prescription pain medication use. Men with higher levels of traditional domestic gender role beliefs strengthened the mediated relationship, contributing to increased prescription pain medication use.

CONCLUSIONS

These findings suggest that although men's perceptions of somatic stimuli through its perceived interference contribute to their medication use, the extent to which they consume prescription pain medication depends on their beliefs in domestic gender roles during chronic pain.

A retrospective observational study comparing somatosensory amplification in fibromyalgia, chronic pain, psychiatric disorders and healthy subjects

OBJECTIVES

Somatosensory amplification (SA) has been described as an important feature of somatoform disorders, and an "amplifying somatic style" has been reported as a negative connotation of body perception. As widespread pain (WSP) in fibromyalgia (FM) is due to a central sensitization (CS) rather than organic alterations, there has been discussion as to whether FM is equivalent to or distinct from somatization disorder (SD). Assuming SD and FM are two distinct entities, an increase in somatic amplification should be expected only in subjects who have SD, regardless of the type of pain they experience. Purpose of the study was to explore the magnitude of SA in FM, and whether this depends on the association with SD.

METHODS

FM (n=159) other forms of chronic pain (OCP, n=582), psychiatric (Psy, n=53) and healthy (H, n=55) subjects were investigated using the Somatosensory Amplification Scale (SSAS), Illness Behavior Questionnaire, (IBQ), Italian Pain Questionnaire (IPQ), and Cold Pressor Test (CPT) in a retrospective observational study.

RESULTS

FM subjects displayed higher SSAS scores than the other groups. High SSAS score was associated with FM (OR=8.39; 95%CI: 5.43-12.46) but not OCP. Although FM has the highest prevalence of SD (x²=14.07; p=.007), high SSAS scores were associated with SD in OCP but not in FM.

CONCLUSIONS

Unlike in OCP, in FM high SSAS scores were independent of the presence of SD. From a biopsychosocial perspective, SSAS may be a factor associated with the onset of FM.

Therapeutic Alliance in a Single Versus Group Rehabilitative Setting After Breast Cancer Surgery: Psychological Profile and Performance Rehabilitation

The survival rate of women after breast cancer has improved significantly worldwide. More attention should be paid to the rehabilitation intervention after surgery. Cancer rehabilitation helps breast cancer survivors maintain the highest possible physical, social, psychological, and vocational function in the limits that are imposed by the cancer and its treatments. The aim of our research was to determine the rehabilitative setting that promotes greater efficacy of the rehabilitation. A double-blind, randomized controlled trial with 45 patients enrolled was conducted. All participants were randomized into two groups: single rehabilitative training (N = 22) and group rehabilitative training (N = 23). Outcomes were assessed for each group before treatment (T0), after first 6 weeks of rehabilitative treatment (T1), and after 3 months (T2). All patients underwent the same rehabilitation treatment, but the setting differed between single and group rehabilitative training, which included four to five patients each and evaluated using Minnesota Multiphasic Personality Inventory (MMPI-2), Working Alliance Inventory Patient form (WAIP), Disabilities of Arm, Shoulder and Hand Questionnaire (DASH), and visual analog scale (VAS). Two patients dropped out in the single treatment group. In the within-group analysis at the three evaluation times, on the VAS, a significant reduction in pain was reported and maintained at the follow-up, as was observed for the DASH and WAIP scales. In the between-group analysis WAIP and Bond scale scores differed significantly in favor of the single treatment. In the group treatment, the Psychopathic Deviate, Masculine/Feminine, and Social Discomfort scales of the MMPI-2 correlated with WAIP Tot at T1. There was an association between the Correction, Hysteria, Paranoid, and Schizophrenia MMPI-2 scales and Δ VAS T0T1 in the total sample. Proposing the same rehabilitative intervention in both breast cancer groups, our results showed significant reduction in pain and good functional recovery of the upper limb, which did not depend on the setting (single or group). However, with single rehabilitation treatment, patients developed a better therapeutic alliance and experienced a more comfortable environment.

Psychopharmacology of chronic pain

Chronic pain is a frequent condition that affects an estimated 20% of people worldwide, accounting for 15%-20% of doctors' appointments (Treede et al., 2015). It lacks the acute warning function of physiologic nociception, and instead involves the activation of multiple neurophysiologic mechanisms in the somatosensory system, a complex neuronal network under the control of powerful autoregulatory loops and able to undergo rapid neuroplastic alteration (Verdu et al., 2008). There is a growing body of research suggesting that some such pathways are shared by major psychologic disorders such as depression and anxiety, opening new avenues in co-treatment strategies. In particular, besides anticonvulsants, which are today used as analgesics, other psychopharmaceuticals, such as the tricyclic antidepressants, are displaying efficacy in the treatment of neuropathic and nociceptive chronic pain. The state of the art regarding the mechanisms of nociception and the pharmacology of both the neurotransmitters involved and the wide range of psychoactive compounds that may be useful in the treatment of chronic pain are discussed.