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Symptom changes in multiple sclerosis following psychological interventions: a systematic review

Abstract

Background

Multiple Sclerosis is a disease of the central nervous system involving a variety of debilitating physical, sensory, cognitive and emotional symptoms. This literature review evaluated the impact of psychological interventions on the physiological symptoms associated with the illness.

Methods

A systematic literature search was conducted using Medline, PsycINFO, Scopus, and the Cochrane Library databases, as well as reference lists. Relevant studies were selected and assessed according to a preset protocol.

Results

The search produced 220 articles, with 22 meeting inclusion criteria for the review. A total of 5,705 subjects with Multiple Sclerosis were analyzed. Results from the included studies indicate a general improvement in both psychological and physiological outcomes following psychological treatment. The most highly influenced physical symptoms include fatigue, sleep disturbances, pain, and physical vitality.

Conclusions

Findings from the review suggest a positive relationship between psychological interventions and physiological Multiple Sclerosis symptoms. Implications for future research are discussed.

Background

This paper provides a brief literature review concerning the relationship between physiological difficulties associated with Multiple Sclerosis (MS) and psychological interventions intended to remediate or otherwise improve functionality and quality of life. Our specific focus is the unearthing of evidence that psychological or behavioral treatments have an impact on both the psychological well-being and the physiological consequences of the disease. We are also interested in exploring the relationship between MS symptoms and psychological issues within the broader framework of the mind-body connection. The paper summarizes the structure of this framework along with the trends in the literature; presents the etiology and primary physiological consequences of MS; a summary of its psychological consequences investigated thus far; and an application of the mind/body hypothesis in the MS field. We identify some key gaps in related research and propose potential areas for further work to address these gaps.

Consciousness and the brain: the mind-body connection

The classic mind-body problem searches for an understanding of the distinctions – or lack thereof – between physical and mental entities: Is the physical brain a distinct entity from its mental processes? How do we know, how is it defined, and what implications are there for how we understand and treat our health?

Conceptions of a dualistic framework follow the early work of Descartes who proposed that the mind is a nonphysical substance distinct from the brain, that our mind (and all it encompasses) is different from our physical brain in its fundamental composition as matter. In contrast to that is the argument for materialism proposing that because the world consists only of matter, there is no true distinction between the mental and the physical, i.e., that all mental states, properties, and processes are connected and interact with physical states, properties, and processes. Much of Western culture continues to preserve a belief in the dichotomy between mind and body.

We see dualism in medical science, which maintains the notion that disorders stem from either the physical or the mental, treating the mind and the body separately [1]. Although there was an appeal that from the field of psychiatry is now beginning to extend over different medical specialties [2] for a more comprehensive treatment model (i.e., a bio-psycho-social approach), a strictly biomedical approach to physical illnesses persists, treating physical bodily symptoms to the exclusion of mental health [3]. Findings from more current research suggest that is changing in several areas, proposing correlations between consciousness and the brain [4]; that negative emotions (e.g., depression and anxiety) are highly associated with the development of coronary heart disease [5]; and that such emotions have a negative effect on cardiovascular and immune system responses [6]. Further research suggests that negative emotions can produce direct and indirect influence on state and trait pain [7] and fatigue [8]. Similarly, Pressman and Cohen [9] suggest that positive emotions can lead to an improvement in physical health, such as increased physical functioning in adults, protection against infectious illness, and lower mortality rates.

The link between mind and body has been proposed going back as far as the 1970s, when Ellen Langer conducted one of the first tests of the mind/body unity theory on disease and ageing. Langer [10] suggested that a healthy mind would put the body in a healthier place, forming the basis for the 1980 “counterclockwise study”, in which Langer and her students studied what effects of turning back the clock psychologically would have on the physiological states of the participants [11]. The results of this study changed the way we view not only aging (the cohort being elderly men) but also of traditional western notions of “limits” - that biology is not destiny, that “it is not primarily our physical selves that limit us but rather our mindset about our physical limits” [10].

Physiology and key psychological consequences of multiple sclerosis

Multiple Sclerosis is a chronic degenerative disease of the central nervous system that involves functionality of the brain and spinal cord, with physical, sensory, cognitive and emotional responses ranging from mild to severe. The relatively high variability in symptomology is determined primarily by the location of the lesions in the brain and spinal cord. Lesions in the frontal and parietal lobes result in cognitive and emotional problems; plaque in the cerebrum, brain stem and spinal cord result in functional limitations of extremities [12]. In this sense, MS is a highly individual disease, prompting interventions targeting broad categories of disease progression and psychosocial impacts. The National Multiple Sclerosis Society (NMSS) estimates prevalence of MS in the United States at 400,000, and global prevalence at over 2 million people [13].

A diagnosis of MS often has profound social and psychological consequences. Because MS usually strikes individuals in their most productive years, its impact can be overwhelming [14]. The unpredictable and variable nature of MS also makes it particularly difficult to accept. The newly diagnosed individual is faced first with the shock of a disease, which is chronic and unpredictable in its course, often with progressive impacts on critical spheres of functioning. The future undoubtedly promises reduced physical function and disability, along with disruptions in education, employment, sexual and family functioning, friendships and activities of daily living. The grim prognosis and the added unpredictability of day-to-day health in relapse-remitting MS and side effects of medication greatly impacts upon quality of life [15].

Multiple Sclerosis can also have a considerable influence on the individual’s sense of self [16],[17]. Physical changes and functional limitations may lead to a sense of loss of identity or role strain especially when the individual can no longer perform previously valued activities [15]. It is frequently necessary to redefine one’s self-image in order to incorporate the limitations imposed by MS. Each time the individual experiences a new loss of function this sense of loss may be renewed. One of the major sources of psychological distress related to the physical impairments is sexual dysfunction. The most frequent complaints are erectile and ejaculatory dysfunctions in men, vaginal lubrication in women, and a loss of libido and difficulty in achieving orgasm in both genders [18]. This problem covers significant aspects of life and can arise at any time during the course of MS, with a prevalence that varies between 50% and 90% [19].

Depressive features are often reported by people who have MS. Lifetime prevalence of major depressive disorder (MDD) is approximately 50% [20]. This is three times the rate reported in the general population [21]; the high prevalence may have multiple etiologies, including psychosocial factors such as the difficulty to deal with one’s emotions, and lack of social support [22]. Depression is one of the main determinants of quality of life and may further compromise cognitive function, and may lead to suicidal intent. It often impairs relationships and reduces compliance with disease- modifying treatments [23]. In addition, people with MS and MDD have been found to suffer from high levels of anxiety [24].

Relationship between physiological and psychological features in multiple sclerosis

Depressive features following the onset of MS physiological symptoms may not be a simple psychological reaction to MS, but instead may be related to biological aspects of the illness itself [25]. Biological processes such as inflammation, neuroendocrine dysfunction or regional brain damage [26] are likely to be at least partly responsible for depressive features.

The relationship between psychological issues and MS symptoms has been underestimated in the past, but there is growing evidence of increased interest within the scientific community. For example, a number of prospective studies suggest that psychological stress increases relapse risk in MS [27]. We believe that more focused investigations into the physiological outcomes of a psychological intervention may lead to a better understanding of therapeutic options for people with MS.

It is also possible that the relationship between the underlying biological mechanism of MS and depressive symptoms works in two directions. If that is the case, successful treatment of depression utilizing behavioral approaches could also affect the underlying MS physiology, encouraging consideration of psychological interventions that could reduce the symptomatology of the illness and moving from a palliative care framework for behavioral treatments to a potentially therapeutic one. There is little direct evidence for this hypothesis currently, primarily because behavioral interventions rarely include biological markers or even consider symptoms assessment among the outcomes. Thus far, psychological outcomes are most often the only ones expected and assessed at the end of a behavioral treatment [28], without considering the possibility that an intervention could impact physiological measures.

Methods

This review focuses on psychological interventions for the treatment of Multiple Sclerosis. A systematic search strategy was conducted with Medline, PsycINFO, Scopus and the Cochrane Library using the search terms “multiple sclerosis” in combination with “psychological intervention”, “psychological treatment”, “psychotherapy” or “psychological therapy”. Further articles were included from the reference lists of review articles. There were no time limitations for the bibliographic search, but emphasis was placed on recent publications, post 2004. The list of articles provided by database and article reference search were screened for articles that investigate the effects of psychological interventions on physical health and symptoms of people with MS. Two reviewers independently assessed articles. Susceptibility to bias was evaluated following the QUOROM Statements [29]. Only articles published in English from peer-reviewed journals were considered. Four criteria were used to select studies: 1) the study reported either primary or secondary outcomes on physical health, either self-reported or instrumentally assessed; 2) the study investigated the effects of a psychological intervention; 3) the outcomes resulted from a comparison between groups, with a randomized controlled trial; 4) study results referred to a minimum of 10 participants. Data from the included article were extracted and reported into an Excel spreadsheet. The review includes randomized clinical trials, that intrinsically present a risk of bias. It is therefore expected that results will provide a reliable recommendation (Evidence Level 1) [30].

Results

Database and article references search provided a list of 220 papers. Twenty-two articles met the criteria for the inclusion in the review. Included studies and their properties are reported in Table 1.

Table 1 Included studies

Overall, a total of 5,705 subjects with MS were included in the analysis, with a large study that included 3,623 subjects [38]. Setting aside that study, sample sizes ranged from 14 to 240 subjects. Most of these studies included people with MS with a limited physical disability (e.g., EDSS < 5.5) and with the average disease duration of 8 years and a mean age over 40 years. Articles that were included describe different psychological interventions for people with MS including cognitive-behavioral interventions, relaxation training, meditation, and stress management and coping skill promotion. There was variability about the duration of the intervention ranging from a week to two years, with an average length of two months. Control groups were composed primarily of subjects on a waiting-list or by no additional treatment group (usual care only). Four studies referred to a comparison between interventions, with controls receiving what was characterized as a less efficacious treatment or a gold-standard comparison.

Psychological variables were primary outcomes in all the included papers. The impact of the interventions on these outcomes was generally positive. Overall, psychological treatments produced an improvement in quality of life and psychological well-being, reducing depressive symptoms, anxiety and perceived stress. Most of the psychological treatments obtained positive effects. These effects were emphasized when the comparison was between the treatment and a usual care or a waiting-list control group.

The majority of the psychological effects on the physical symptoms were assessed using self-report measures, referencing the perception of physical variables or symptoms (e.g., fatigue, pain), or the perception of general physical health. Following the psychological intervention, perceptions of general health improved, with higher scores on the physical subscales on quality of life questionnaires. One symptom positively affected by psychological treatments is fatigue, in which subjects from experimental groups often reported a significant decrease in fatigue along with a subsequent reduction in physical limitations related to tiredness. Similarly, improvements in sleep disturbances, physical vitality, and vigor were reported. Psychological interventions also appeared to reduce the perception of pain.

Changes in physical issues do not result only from self-reported questionnaires but few studies investigated these changes with objective measurements. Results indicate that a stress-management intervention reduces the number of brain lesions associated with the relapsing-remitting process of MS, with a consequent reduction of crisis [46]. A short patient education program successfully reduced the number of relapses, compared to controls [52]. Furthermore, successful treatment of depression (either with psychological or pharmacological interventions) resulted associated with a reduction in non-specific and antigen-specific interferon production [51].

In general, with the caveat of the limited number of studies involved, when the psychological intervention lead to a better psychological outcome, such as the reduction of depressive symptoms or the improvement in psychological well-being, the assessed physical outcomes were positively influenced. A correlation can be observed between the extent of changes from a psychological perspective and the size of change in MS symptoms. More intense and efficacious psychological interventions lead to higher changes on a physical level than less intense behavioral treatments.

Articles included in the review seldom formally assessed the level of disability making it impossible to deeply investigate this aspect of findings. Future studies would benefit from a greater focus on assessment of disability in terms of functioning and inclusion of more non-self-report measures pre and post-intervention.

Discussion

Results from the studies considered in this review suggest that psychological interventions may well have a positive effect on MS symptoms. In particular, fatigue, physical vitality, sleep disturbances and pain are the physical variables investigated that appeared to benefit from such interventions, together with perception of general health. Physical changes following a psychological intervention are reported on both self-report measurements and, in a more limited number of studies, on biological measures. If results are limited to questionnaire outcomes, it could be argued that psychological interventions may not provide objective changes, but could change the perception of the physical symptomology. It appears highly likely that both subjective and objective outcomes are moving toward one specific direction: that the mind does influence the body, even effecting MS symptoms. These findings should not surprise us, as we consider increasing evidence of the mind’s influence on the body. The idea that psychological treatments, however, may influence the physical expression (i.e., symptoms) of the disease itself is relatively new and few studies dare to explore this idea. In fact, relatively few papers considered some physical symptoms as a possible outcome for psychological interventions. Most of these studies only included a limited self-report assessment of health. It is possible that researchers in the MS field have thus far not tried to influence the possibility that interventions at the psychological level can result in positive effects on the body. Those who assessed physical changes with objective measures [46],[51],[52] found interesting results that surely deserve to be deepened and further explored. Since a cure for the various form of MS is not yet available, it makes sense to explore every possible therapeutic option, including the possibility that psychological treatment need not be palliative or burden-relief in nature [25],[28]. Not surprisingly, fatigue, physical vitality and sleep disorder are often part of diagnostic criteria in the framework of depressive disorders. This is consistent with our hypothesis as an example of the effects that the mental domain can express over the body.

A few limitations of the present study should be noted. The majority of the studies included in the review utilized self-report measures for acquiring physical outcome data. As self-report measures are inherently based on subjective perception, the quality of their construct validity may have confounded the results of the review. Another limitation was that none of the studies reviewed included outcome data of any form of disability, possibly narrowing the scope of our assessment of physical outcomes. Finally, few studies in total were eligible for review; the studies included may therefore not adequately represent the general MS population.

Conclusions

This brief review investigates the hypothesis that psychological interventions for individuals with multiple sclerosis have a positive impact not only at the psychological level, but also on the physical domains, in particular on symptoms of disease. Despite a paucity of studies that included assessment of physical variables as outcomes for psychological interventions, available data strongly suggest that the hypothesized connection does exist. In particular, fatigue, pain, physical vitality and quality of sleep, assessed by subjects’ evaluations, improve significantly after most of the interventions. Furthermore, a few cutting edge studies that assessed physical outcomes with objective measurements suggest that there are actual physical benefits, for example in terms of interferon level and brain lesions.

Our results indicate that there is a strong unexplored potential for psychological interventions to improve the quality of life of people with MS from both a psychological perspective and in terms of a reduction in symptoms. Given the potential improvement of well-being, we strongly urge research efforts be applied in this direction.

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Acknowledgements

This work was partially supported by funds from Universita’ Cattolica del Sacro Cuore (D3.1 line) to FP and from Fondazione Italiana Sclerosi Multipla, with the FISM 2013 Research Grant “Migliorare la Qualità di Vita di persone con Sclerosi Multipla e dei loro familiari tramite un intervento di Mindfulness e Telemedicina”.

Author information

Correspondence to Francesco Pagnini.

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Competing interests

The authors declare that they have no competing interests.

Authors’ contributions

FP designed the research, participated to literature search and data interpretation; CMB and DP participated to literature search and data interpretation; EL participated in the study design and helped to draft the manuscript. All authors have read and have approved the final manuscript.

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Keywords

  • Multiple sclerosis
  • Psychological interventions
  • Physical health outcomes
  • Mind/body connection