Regional cerebral blood flow between primary and concomitant fibromyalgia patients: a possible way to differentiate concomitant fibromyalgia from the primary disease

OBJECTIVES

Technetium-99m ethyl cysteinate dimer (Tc-99m ECD) brain single photon emission computed tomography (SPECT) has been used to detect abnormal regional cerebral blood flow (rCBF) in women with primary fibromyalgia (FM). The main aim of this study was to investigate the rCBF deficit in concomitant FM patients and compare it with primary FM.

METHODS

An observational study was designed to analyse the SPECT findings in 92 female patients recruited from January 2002 to January 2004. Differences in the rCBF hypoperfusive areas between 49 primary and 29 concomitant FM patients were assessed in different areas of the brain using the chi(2)-test for statistical significance.

RESULTS

Tc-99m ECD brain SPECT in 71 FM patients revealed heterogeneous rCBF in comparison to the homogeneous scan in 14 control patients. The most prominent rCBF hypoperfusive region in both primary and concomitant FM groups was the left temporoparietal area, followed by the thalamus, right temporoparietal, frontal, and basal ganglia areas. Differences in rCBF hypoperfusion in these areas for both FM groups were not significant (all p>0.5).

CONCLUSIONS

Reduced rCBF at cortical regions, in addition to previously reported areas at the thalamus and the subcortical nucleus, in FM patients was demonstrated in this study. The perfusion deficit areas were similar between primary and concomitant FM when the underlying disease activity was quiescent. The feasibility of using this neuroimaging study to differentiate FM from the primary disease, such as rheumatoid arthritis (RA)-associated depression and neuropsychiatric lupus, should be considered.

Imaging pain of fibromyalgia

Brain imaging studies have provided objective evidence of abnormal central regulation of pain in fibromyalgia (FM). Resting brain blood flow studies have reported mixed findings for several brain regions, whereas decreased thalamic blood flow has been noted by several investigators. Studies examining the function of the nociceptive system in FM have reported augmented brain responses to both painful and non-painful stimuli that may be influenced by psychologic dispositions such as depressed mood and catastrophizing. Treatment approaches are beginning to demonstrate the potential for brain imaging to improve our understanding of pain-alleviating mechanisms. Data from other chronic conditions suggest that idiopathic pain may be maintained by similar central abnormalities as in FM, whereas chronic pain conditions with a known nociceptive source may not be. Future neuroimaging research in FM is clearly warranted and should continue to improve our understanding of factors involved in pain maintenance and symptom exacerbation.

Obstructive sleep apnea syndrome as an uncommon cause of fibromyalgia: a case report

Fibromyalgia syndrome (FMS) is characterized by chronic widespread musculoskeletal pain, stiffness and tenderness at multiple points. Sleep disturbances are common in FMS and patients usually complain about nonrestorative sleep. Obstructive sleep apnea syndrome (OSAS) is characterized by repetitive pharyngeal collapse during sleep. Recurrent arousals from sleep occurs to restore pharyngeal patency in OSAS and this results in increased sympathetic activity and fragmentation of sleep. Sleep disturbances may lead to musculoskeletal pain and some studies suggest a relation between OSAS and FMS. Since OSAS is strongly associated with increased risk of myocardial infarction, cerebrovascular accidents and congestive heart failure, its diagnosis and treatment are of particular importance. Herein we present a female patient with diagnosis of FMS for 10 years who had complaints of morning fatigue, restless sleep, sleepiness during day and snoring besides musculoskeletal symptoms. Severe OSAS was diagnosed after polysomnographic analysis and FMS symptoms were totally improved with nasal continuous positive airway pressure treatment.

[Causal attributions in the narratives of patients suffering from fibromyalgia]

Fibromyalgia is a chronic pain syndrome, common in primary care. This article presents some elements of a study based on 65 narratives of patients suffering from fibromyalgia. These narratives showed that patients establish causal links between traumatic events such as death, abuse or accident and fibromyalgia. There is some evidence supporting psychosocial approaches as useful in the clinical management of such complex chronic syndromes. It seems in particular important for the doctor to take into account the subjective experience of his/her patients in order to better understand them and legitimate their suffering, an essential step toward an integrated patient-centred healthcare project.

Future perspectives: pathogenesis of chronic muscle pain

Chronic painful muscle conditions include non-inflammatory and inflammatory illnesses. This review is focused on chronic non-inflammatory pain conditions such as myofascial pain syndrome (MPS) and fibromyalgia syndrome (FM), and will not discuss metabolic, genetic or inflammatory muscle diseases such as McArdle's disease, muscular dystrophy, polymyositis, dermatomyositis, or inclusion body myositis.

Narrative review: the pathophysiology of fibromyalgia

Primary fibromyalgia is a common yet poorly understood syndrome characterized by diffuse chronic pain accompanied by other somatic symptoms, including poor sleep, fatigue, and stiffness, in the absence of disease. Fibromyalgia does not have a distinct cause or pathology. Nevertheless, in the past decade, the study of chronic pain has yielded new insights into the pathophysiology of fibromyalgia and related chronic pain disorders. Accruing evidence shows that patients with fibromyalgia experience pain differently from the general population because of dysfunctional pain processing in the central nervous system. Aberrant pain processing, which can result in chronic pain and associated symptoms, may be the result of several interplaying mechanisms, including central sensitization, blunting of inhibitory pain pathways, alterations in neurotransmitters, and psychiatric comorbid conditions. This review provides an overview of the mechanisms currently thought to be partly responsible for the chronic diffuse pain typical of fibromyalgia.

Getting the point about fibromyalgia

Invisible and incurable, this disorder can wreak havoc with your patient's life. Find out how to get her back on track. Fibromyalgia, a complex, chronic disorder of pain processing, is thought to be the most common cause of generalized musculoskeletal pain in women ages 20 to 55. This disorder, which affects the muscles, ligaments, and tendons, occurs in 3 to 6 million Americans, mostly women. Some patients are affected only mildly, but up to 30% have symptoms that seriously impair their quality of life.

[Fibromyalgia. Diagnostics--disease approach--therapy]

Fibromyalgia is a complex of symptoms predominantly affecting females and consisting of widespread pain. Etiology and pathogenesis are not sufficiently known yet, however, there is the assumption that fibromyalgia is looked at as being an illness with biological, psychological, and social aspects. Therefore, the treatment of fibromyalgia calls for a multimodal therapy approach. The importance of fibromyalgia has been recognized within the German health system by creating the new ICD code M79.70 and by assigning fibromyalgia its own rheumatologic DRG (I79Z). In future research of fibromyalgia special attention needs to be placed upon gender-specific problems.

[The relationship between psychological factors and health care-seeking behavior in fibromyalgia patients]

OBJECTIVE

The aim of this study was to examine whether cognitive factors, such as attributions, expectations, and anger management style, contribute to the decision to seek medical care for fibromyalgia syndrome (FMS).

METHOD

We recruited 3 groups of subjects; patients from a FMS tertiary care setting, community residents with FMS who had not sought medical care for their FMS symptoms (nonpatients), and healthy controls. In all, 38 FMS nonpatients were compared to 37 FMS patients and 41 healthy controls on measures of anxiety, depression, anger, locus of control (LOC), attributions, pain intensity, and disability, as well as demographic characteristics.

RESULTS

The prevalence of FMS non-patients was 2%. There was a significant difference between the 3 groups on the measures of anxiety, depression, LOC, and somatic and normalizing subscale scores of the symptom interpretation questionnaire (SIQ). FMS nonpatients, relative to FMS patients and healthy controls, were characterized by a significantly higher measure of both LOC and normalizing subscale score on the SIQ. There were no differences between the 2 FMS groups in demographical percentage and other psychometric measures. A hierarchical logistic regression model showed that the number of tender points, normalizing attribution style, and depression were independent predictors of help-seeking behavior.

CONCLUSION

The rate of psychiatric and medical history is not related to the FMS syndrome. Expectations and a normalizing attribution style may contribute to help-seeking behavior for FMS.

Understanding the fibromyalgia syndrome

The fibromyalgia syndrome (FMS) is the most frequent cause of chronic, widespread pain. This review, which is targeted at the psychiatry and psychopharmacology communities, summarizes the state-of-the-art as it relates to both the pathophysiology and treatment of FMS. Toward this end, the anatomy and physiology of pain pathways are summarized, followed by a review of the altered biology of pain processing, neurotransmitter function, and neuroendocrine systems in FMS. The categories of current drugs employed to treat the disorder are detailed, along with a critical review of the literature supporting such use.

The pain of fibromyalgia syndrome is due to muscle hypoperfusion induced by regional vasomotor dysregulation

Fibromyalgia syndrome (FMS) is a condition of chronic muscle pain and fatigue of unknown etiology and pathogenesis. There is limited support for the various hypotheses espoused to account for the manifestations of FMS, including immunogenic, endocrine, and neurological mechanisms. Treatment, partially effective at best, is directed toward symptomatic relief without the benefit of targeting known, underlying pathology. A noteworthy commonality among partially effective therapies is a vasodilatory effect. This is true both of conventional treatments, unconventional treatments such as intravenous micronutrient therapy, and lifestyle treatments, specifically graduated exercise. The pain of fibromyalgia is described in terms suggestive of the pain in muscles following extreme exertion and anaerobic metabolism. Taken together, these characteristics suggest that the pain could be induced by vasomotor dysregulation, and vasoconstriction in muscle, leading to low-level ischemia and its metabolic sequelae. Vasodilatory influences, including physical activity, relieve the pain of FMS by increasing muscle perfusion. There are some preliminary data consistent with this hypothesis, and nothing known about FMS that refutes it. The hypothesis that the downstream cause of FMS symptoms is muscle hypoperfusion due to regional vasomotor dysregulation has clear implications for treatment; is testable with current technology; and should be investigated.

Stress, depression and fibromyalgia

There is increasing evidence that stress and depression may play a crucial role in the aetiology and pathophysiology of fibromyalgia (FM). We first review recent studies on the possible role of life stress, including childhood trauma, in FM. Subsequently we focus on clinical and aetio-pathogenetic links between stress, depression and pain. We put forward the hypothesis that chronic stress/depression may contribute to a dysregulation of neuro-endocrine, immune and central pain mechanisms in FM. Finally, we discuss some future directions, including the use of new conceptual models, research topics and strategies, as well as potential implications from recent studies in affective disorders for the treatment of FM.

Creating meaning in fibromyalgia syndrome

Gaining a diagnosis is considered to legitimate a person's illness, to both the self and the wider social world, while also giving hope that treatments, and possibly a cure, will be found. A further function of diagnosis from the patient's perspective is to give meaning to the illness experience, which is often uncertain and confusing. To do so, a diagnosis must itself have meaning. This paper explores the creation of meaning in a medically unexplained disorder, fibromyalgia syndrome (FMS). Semi-structured interviews, in which the diagnostic process was explored, were conducted with 17 people diagnosed with FMS in the United Kingdom, selected from a hospital database (16 women, 1 man). Documentary analysis was also undertaken on information available from support groups and health professionals. Although initially an acceptable diagnosis to sufferers, FMS was viewed as a mysterious label, which provided no meaning at the time of diagnosis. The sought information was accessed in an attempt to resolve its meaninglessness, but this proved problematic due to the ambiguous definition of FMS within the medical and support group literature, the invisible nature of the illness, and the lack of an environment where these uncertainties could be openly discussed. Informants varied in the degree of longer-term acceptance of a diagnosis of FMS, in relation to the concordance they achieved between the diagnosis and their experience of illness.

The role of psychosocial factors in predicting the onset of chronic widespread pain: results from a prospective population-based study

OBJECTIVE

Chronic widespread pain (CWP) is strongly associated with psychosocial distress both in a clinical setting and in the community. The aim of this study was to determine the contribution of measures of psychosocial distress, health-seeking behaviour, sleep problems and traumatic life events to the development of new cases of CWP in the community.

METHODS

In a population-based prospective study, 3171 adults aged 25-65 yrs free of CWP were followed-up 15 months later to identify those with new CWP. Baseline data were available on their scores from a number of psychological scales including Illness Attitude Scales (IAS), Somatic Symptom Checklist (SSC), Hospital Anxiety & Depression Scale, Sleep Problems Scale, and Life Events Inventory.

RESULTS

324 subjects [10%, 95% confidence interval (CI) 9.2, 11.3] developed new CWP at follow-up. After adjustment for age and sex, three factors independently predicted the development of CWP: scoring three or more on the SSC [odds ratio (OR) 1.8, 95% CI 1.1, 3.1], scoring eight or more on the Illness Behaviour subscale of the IAS (OR 3.3, 95% CI 2.3, 4.8), and nine or more on the Sleep Problem Scale (OR 2.7, 95% CI 1.6, 3.2). Subjects exposed to all three factors were at 12 times the odds of new CWP than those with low scores on all scales.

CONCLUSION

Subjects are at substantial increased odds of developing CWP if they display features of somatization, health-seeking behaviour and poor sleep. Psychosocial distress has a strong aetiological influence on CWP.

At the crossroads between tension-type headache and fibromyalgia

Fibromyalgia syndrome and tension-type headache have multiple clinical features in common, and pathogenic mechanisms partly overlap. Significant differences need to be recognized as well. Studying the correlations of these often comorbid conditions represents a unique opportunity to gain insight into their pathophysiology and that of other chronic pain syndromes, to increase the accuracy of their diagnosis, and to improve the therapeutic armamentarium.

Fibromyalgie : une maladie du traumatisme psychique ?

Chronic unexplained pain may be a somatic manifestation of psychological distress - often untreated distress. The association between psychic trauma, posttraumatic symptoms, psychic dissociation, and somatoform disorders is currently well documented. When examining a patient with chronic pain syndrome, it is important to consider its psychic dimension early on and to look for a history of psychic trauma. This can help avoid prolonged chronic effects and the emergence of psychiatric comorbidity. There is currently no consensual medication strategy for treatment of unexplained chronic pain syndrome. Multidisciplinary outpatient management is necessary in these complex cases, which require simultaneous medical and psychiatric referrals.

Are patients with systemic lupus erythematosus at increased risk for Fibromyalgia?

Widespread chronic pain, fatigue, and distress do not represent risk factors for future systemic lupus erythematosus (SLE) or other autoimmune syndromes. On the other hand, SLE seems to be a significant risk factor for fibromyalgia (FM). Up to 47% of SLE patients fulfill FM criteria. SLE patients with concomitant FM are often highly symptomatic and dysfunctional. The presence of FM symptoms in SLE patients, however, does not predict more extensive organ involvement or lupus activity. The high concordance of SLE with FM suggests common mechanisms related to pain and distress in both patient groups. Recent research suggests involvement of N-methyl-D-aspartate (NMDA) and neurokinin receptor systems. Thus, autoimmune activity against these receptor systems in SLE patients could result in pain, cognitive defects, and chronic pain states including FM. Conversely, treatment of SLE-FM patients with inhibitors of NMDA or neurokinin receptors may prevent or alleviate cognitive abnormalities and chronic pain, as well as FM.

Fibromyalgia, infection and vaccination: two more parts in the etiological puzzle

As the pathogenesis of fibromyalgia continues to raise debate, multiple putative triggers have been implicated. The current review summarizes the available data linking fibromyalgia to either infection or vaccination. Multiple infectious agents have been associated with the development of either full-blown fibromyalgia (e.g. hepatits C), or with symptom complexes extensively overlapping with that syndrome (e.g. chronic Lyme disease). The cases of Lyme disease, mycoplasma, hepatits C and HIV are detailed. Despite the described associations, no evidence is available demonstrating the utility of antibiotic or anti-viral treatment in the management of fibromyalgia. Possible mechanistic links between fibromyalgia and HIV are reviewed. Associations have been described between various vaccinations and symptom complexes including fibromyalgia and chronic fatigue syndrome. The case of Gulf War syndrome, a functional multisystem entity sharing many clinical characteristics with fibromyalgia is discussed, with emphasis on the possibility of association with administration of multiple vaccinations during deployment in the Persian Gulf and the interaction with stress and trauma. Based on this example a model is proposed, wherein vaccinations function as co-triggers for the development of functional disorders including fibromyalgia, in conjunction with additional contributing factors.

Characteristics and incidence of fibromyalgia in patients who receive worker's compensation

The aim of our study was to investigate the incidence of fibromyalgia syndrome (FMS) in patients with work-related injuries, the potential risk factors for and causes of FMS, and the disabilities associated with FMS.

Factors That Affect the Number of Tender Points in Fibromyalgia and Chronic Widespread Pain Patients Who Did not Meet the ACR 1990 Criteria for Fibromyalgia: Are Tender Points a Reflection of Neuropathic Pain?

OBJECTIVE

This study aims to compare fibromyalgia (FM) and chronic widespread pain (CWP) patients who do not fulfill the criteria for tender points (TP).

METHODS

We included 150 patients diagnosed with FM according to ACR 1990 criteria and 42 patients with CWP who did not fulfill TP criteria for FM into the study. The clinical features of the patients were recorded, and the TP count was determined. By means of a visual analog scale (VAS), all patients were questioned about the severity of pain and FM-related symptoms. In addition, the patients were administered the Duke Anxiety Depression (Duke-AD) scale and somatization symptom questionnaire. Leeds Assessment of Neuropathic Symptoms and Signs (LANSS) pain scale was used to determine the neuropathic pain score.

RESULTS

According to VAS, the severity of pain, sleep disturbance, the number of somatization symptoms, LANSS, and Duke-AD scores were significantly higher in FM patients than in patients with CWP (all P values <0.05). The number of TP correlated with severity of pain (r = 0.32, P < 0.001), the number of somatization symptoms (r = 0.26, P = 0.01), sleep disturbance (r = 0.18, P = 0.01), and LANSS score (r = 0.4, P < 0.001). Multiple logistic regression analysis revealed that independent factors that affected the presence of > or =11 TP were the severity of pain on VAS (OR: 1.03, 95% CI: 1.01-1.06, P = 0.045) and LANSS score (OR: 1.36, 95% CI: 1.12-1.62, P = 0.001).

CONCLUSIONS

CWP patients have symptoms similar to FM patients, though less severe. The most important factor that affects the criteria for fulfilling the number TP in CWP patients is the neuropathic pain score, which suggests that FM is primarily a neuropathic pain syndrome.

Fibromyalgia: aetiology, diagnosis, symptoms and management

Fibromyalgia is believed to affect about 2% of the UK population, predominantly women, and is characterized by the symptoms of widespread musculoskeletal pain, persistent fatigue, non-refreshing sleep and generalized stiffness. It is also accompanied by a variety of associated symptoms which can appear baffling to both patient and doctor alike. Research into this often dismissed syndrome has increased exponentially over the last two decades and the evidence is growing to support an underlying pathology involving pain amplification, sleep abnormalities, hormonal imbalance and autonomic nervous system dysfunction. This review looks at diagnosis, research and current treatment options and offers an insight into the patients' experience with the medical and nursing professions.