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Revista Brasileira de Reumatologia

Print version ISSN 0482-5004

Rev. Bras. Reumatol. vol.54 no.5 São Paulo Seot./Oct. 2014

http://dx.doi.org/10.1016/j.rbr.2014.03.017 

Brief Communications

Characterization of the pain, sleep and alexithymia patterns of patients with fibromyalgia treated in a Brazilian tertiary center

Lazslo A. Avila2 

Gerardo M. de Araujo Filho2  * 

Estefano F.U. Guimarães2 

Lauro C.S. Gonçalves2 

Paola N. Paschoalin2 

Fabia B. Aleixo2 

2Department of Psychiatry and Medical Psychology, Faculdade de Medicina de São José do Rio Preto, São José do Rio Preto, SP, Brazil

ABSTRACT

Objectives:

Fibromyalgia (FM) is a complex syndrome that is characterized by lasting and diffuse chronic musculoskeletal pain, derived from non-inflammatory causes and classically associated with the presence of specific tender points. However, studies have highlighted other important symptoms associated with a lower quality of life (QOL) in FM, such as sleep disturbances and alexithymia. This study aimed to investigate the pain, sleep and alexithymia patterns of FM patients treated in a Brazilian tertiary center.

Methods:

20 patients with FM who were followed-up in the Rheumatology outpatient clinic of a Brazilian tertiary center (Faculdade de Medicina de São José do Rio Preto - FAMERP, São Paulo, Brazil) and 20 patients without FM from other outpatient services of the FAMERP completed a clinical and socio-demographic questionnaire, the Fibromyalgia Impact Questionnaire (FIQ), the Pittsburgh Sleep Quality Index (PSQI), the Toronto Alexithymia Scale (TAS-20) and the SF-36 (WHOQOL).

Results:

The patients with FM presented worse performances in all QOL dimensions of the SF-36 and higher scores on the PSQI (p = 0.01), and the TAS-20 (p = 0.02). Patients with FM also scored significantly higher in all specific domains of PSQI and TAS-20.

Discussion:

The present data were in accordance with literature, disclosing a worse performance of patients with FM on pain impact, sleep complains and more presence of alexithymia.

Conclusion:

Studies have disclosed the presence of important and frequently underdiagnosed symptoms beyond pain complaints in FM, such as sleep complaints and alexithymia, and a better knowledge of such disturbances might improve FM patients' approach and treatment.

Key words: Fibromyalgia; Sleep complaints; Quality of life; Alexithymia; Pittsburgh Sleep Quality Index; Toronto Alexithymia Scale

Introduction

Fibromyalgia (FM) is a complex syndrome that is characterized by lasting and diffuse chronic musculoskeletal pain, derived from non-inflammatory causes and classically associated with the presence of specific tender points.1-5 It is the second most common rheumatologic disease, with a worldwide prevalence of 0.5% to 5%. Women aged between 40 and 55 years are predominantly affected, with a prevalence approximately seven fold higher than in men.1,4,5 The diagnosis of FM remains essentially clinical, although the aid of subsidiary exams can be useful for associated diagnosis.5-7

Recent studies have highlighted other important symptoms associated with a lower quality of life (QOL) in FM, such as sleep disturbances and alexithymia.8-10 The major sleep complaints reported by patients include insomnia, feeling tired upon waking, decreased sleep time and an increased number of sleep interruptions per night. In addition, the high prevalence of sleep disorders in patients with FM impairs their QOL in two ways: difficulty obtaining restorative sleep and increased sleepiness during the day, characterized by difficulty maintaining wakefulness.8-10

In accordance with the definition provided by Campbell (1996), "alexithymia" is characterized by difficulty identifying one's own emotional state, with the inability to focus on external and somatic interests and to productively fantasize.11-15 Studies have reported that FM patients have a specific difficulty in recognizing their own emotions in association with more complaints of increased pain, fatigue and decreased physical function.14-16 In addition to alexithymia, patients exhibit "sensory amplification", which consists of a greater sensitivity and responsiveness to different sensory stimuli, including pain.17 Based on these definitions and previous studies of FM, the present study aimed to investigate, in a more detailed manner, the pain, sleep and alexithymia patterns of FM patients treated in a Brazilian tertiary center.

Patients and methods

Participants

The included patients were followed-up in the Rheumatology outpatient clinic of a Brazilian tertiary center (Faculdade de Medicina de São José do Rio Preto - FAMERP, São José do Rio Preto, Brazil), and all patients were receiving treatment at the time of the study. After receiving Ethical Committee approval, the advantages and risks of participation were explained, and informed consent was obtained. The inclusion criteria for the patient group were an age between 18 and 65 years, the presnce of a current diagnosis of FM accordingly to the American College of Rheumatology (ACR) and having been treated in our unit for at least six months. Patients younger than 18 years or older than 65 years, those with pain syndromes not diagnosed as FM and with any other rheumatologic disease in addition to FM were excluded. The study sample included 40 individuals divided into two groups: 20 patients with FM (patient group - PG) and 20 patients from other outpatient services of the FAMERP (control group - CG). These groups were created to include patients exposed to similar levels of hospital stress in both groups, eliminating this possible bias.

Procedures

A clinical and socio-demographic questionnaire including age, gender, schooling, psychiatric family history and drug treatment was administered. The FM patients were then administered specific questionnaires:

  1. Fibromyalgia Impact Questionnaire (FIQ) - to analyze specific aspects of the pain complaints. This instrument has ten domains (functional capacity, well-being, work absences, ability to work, pain, fatigue, sleep, morning stiffness, anxiety and depression), and the general score can range from 0 to 80. Patients with higher pain impact present higher scores;

  2. Pittsburgh Sleep Quality Index (PSQI) - to analyze aspects associated with sleep. This instrument has seven domains (subjective sleep quality, sleep latency, sleep duration, habitual sleep efficiency, sleep disorders, use of medications for sleep and daytime dysfunction). The maximum total score is 21 points, and the higher the value, the lower the quality of sleep evidenced. Total scores greater than 5 are indicative of poor sleep quality;

  3. Toronto Alexithymia Scale (TAS-20) - to assess the presence of symptoms associated with alexithymia. This instrument examines three main domains: ability to identify and to describe feelings, and to distinguish feelings of bodily sensations, ability to daydream and preference for focusing on external events rather than inner experiences. The score indicated by the instrument ranges from 26 to 130. Values lower than 62 do not indicate symptoms of alexithymia, and values higher than 74 indicate the presence of these symptoms. Values between 63 and 73 are inconclusive;

  4. The SF-36 (WHOQOL) - to analyze the QOL in eight domains: functional, limitations due to physical aspects, bodily pain, general health, vitality, social functioning, emotional health and mental health. The lower the score is, the worse the QOL.

Statistics

Demographic data are presented as the mean ± standard deviation. Age and gender matching between patients and controls were evaluated using the two independent samples t-test and Fisher's exact test, respectively. Data from the questionnaires were analyzed using nonparametric tests (unpaired t-test, Mann-Whitney Test and Spearman correlation). The statistical significance level was set at 5%.

Results

Thirty-seven females (19 from the PG and 18 from the CG) and three males (one from the PG and two from the CG) were enrolled in the study. Groups were matched by gender (p = 0.85), age (p = 0.82) and years of schooling (p = 0.12) (Table 1).

Table 1 Demographic data of patients with fibromyalgia and a control group. 

Demographic data FM CG P
Number of subjects 20 20 -
Age in years (mean ± SD) 32.7 ± 9.1 32.2 ± 7.1 0.82
Number of females (%) 19 (95) 18 (90) 0.85
Years of schooling (mean ± SD) 9.2 ± 6.3 12.8 ± 5.1 0.12

CG, control group; FM, fibromyalgia group; SD, standard deviation.

Regarding the impact of FM as assessed by the FIQ, there were significant differences between the PG and the CG. The mean general score was 52.0 ± 13.54 for the PG and 26.0 ± 16.06 for the CG (p < 0.0001). Higher scores were observed in the PG in all 10 domains. The SF-36 also showed significant differences between both groups, with the PG presenting significantly lower mean scores in all eight domains compared with the CG. Regarding the sleep aspects assessed by the PSQI, there was a significant difference between the total scores of the CG (6.65 ± 4.46) and the PG (11.65 ± 4.48) (p = 0.01). The PG scored higher in all seven domains of the PSQI. Regarding the symptoms of alexithymia assessed by the TAS-20, the mean total score was 67.10 ± 9.34 for the PG and 59.15 ± 8.70 for the CG (p = 0.03). Comparisons between the two groups for the domains of all of the instruments are shown in Table 2.

Table 2 Comparisons of the domains of all tested instruments between the patient and control groups. 

Instrument Domain PG (mean ± SD) CG (mean ± SD) p
Fibromyalgia Impact Questionnaire (FIQ) Functional capacity 3.0 ± 2.59 1.0 ± 0.39 0.001a
  Well-being 6.0 ± 3.52 4.0 ± 3.85 0.09
  Work absences 3.0 ± 2.12 1.0 ± 0.84 0.004a
  Ability to work 6.0 ± 2.95 1.0 ± 1.50 < 0.001a
  Fatigue 7.0 ± 2.85 2.0 ± 1.49 < 0.001a
  Sleep 8.0 ± 2.62 5.0 ± 3.56 0.004a
  Morning stiffness 7.0 ± 3.07 1.0 ± 0.86 < 0.001a
  Anxiety 7.0 ± 3.23 5.0 ± 3.07 0.04a
  Depression 7.0 ± 3.57 4.0 ± 3.15 0.007a
SF-36 (WHOQOL) Functional skills 41.75 ± 25.89 80.0 ± 28.35 < 0.001a
  Physical aspects 17.50 ± 28.67 76.0 ± 30.87 < 0.001a
  Bodily pain 32.65 ± 19.03 67.0 ± 28.46 < 0.001a
  General health 36.55 36.55 ± 21.91 57.85 ± 14.89 0.009a
  Vitality 28.0 ± 21.16 50.25 ± 22.75 0.002a
  Social functioning 45.0 ± 34.45 70.62 ± 30.58 0.01a
  Emotional aspects 34.95 ± 41.38 74.32 ± 38.24 0.003a
  Mental health 41.20 ± 32.27 66.40 ± 21.71 0.006a
Pittsburgh Sleep Quality Index (PSQI) Subjective sleep quality 1.70 1.20 0.12
  Sleep latency 2.10 1.25 0.01a
  Sleep duration 1.40 0.85 0.01a
  Habitual sleep efficiency 1.15 0.45 0.11
  Sleep disorders 1.95 1.30 0.002a
  Use of sleeping medications 1.65 0.70 0.02a
  Daytime dysfunction 1.80 0.90 0.001a
Toronto Alexithymia Scale (TAS-20) Ability to identify/describe feelings 36.85 ± 10.64 31.95 ± 7.92 0.01a
  Ability to daydream 17.70 ± 5.47 16.60 ± 3.41 0.45
  Preference for focusing on external events 12.55 ± 2.91 10.60 ± 2.78 0.03a

CG, control group; PG, patient group; SD, standard deviation.

ap <0.05.

Discussion

FM is a complex disease with a significant prevalence among the general population and is characterized by complaints of pain that are often underdiagnosed. Moreover, the curent literature highlights the existence of other important and underdiagnosed symptoms, such as sleep disturbances and alexithymia, which could be associated with lower QOL among patients with FM. Thus, the investigation of these aspects and the search for tools to assess such complaints are necessary.6-18

In the present study, the FIQ differentiated the impact of pain between the PG and the CG, disclosing a higher impact in the PG compared to the CG in all 10 fields, as originally expected. Other studies have confirmed this finding, reporting impairments of the same skills in patients with FM.6-10,18,19 In addition, the results regarding the QOL measured using the SF-36 showed an overall reduction in all domains of the questionnaire in the PG compared with the CG. This observation has also been described in other studies showing the negative impact of FM on patients, reducing their QOL and affecting both their physical and mental health.6,8,18-21

The results of the PSQI demonstrated more frequent sleep complaints among patients with FM. These results are in accordance with the most recently published studies, which have highlighted the importance of sleep disorders in the clinical condition and in the QOL of patients with FM.15-18,22,23

Among the aspects studied, the domain "using medicaions to sleep" suggests that FM patients rely on medications to aid sleep and do not reach "habitual sleep efficiency" or "subjective sleep quality". In addition, the domains of "daytime dysfunction" and "sleep amendment" suggest the persistence of non-restorative sleep, resulting in a considerable deficit in the ability to perform daily activities.15-18,22,23 However, even with significant differences in scores between the PG and the CG on the PSQI, both groups showed low sleep quality (scores above 5). This finding can be explained by the stress caused by both disease and treatment in a tertiary center, to which the two groups were exposed at the time of the study. Other studies have also observed such effects when patients with FM were compared with patients with other chronic and disabling disorders, such as rheumatoid arthritis and depression.20,21

Regarding the presence of alexithymia symptoms meaured using the TAS, the PG presented significantly higher scores than the CG. However, both groups scored very close tothe average, with values adjacent to the "inconclusive interal" of the instrument. This finding could be a consequence of the small number of participants, which is an important limitation of this study.15,23,24 Lane and Sechrest (1998) adminstered the TAS-20 to 380 individuals stratified by age, gender, socioeconomic status and years of education, and they also observed that this instrument had a tendency to report worse results for patients with advanced age, male gender, low socioeconomic status and fewer years of education.23 Thereore, one can infer that the present results are also affected by low socioeconomic status and few years of education, which were present in both groups, thus narrowing the expected diference between the PG and the CG.

To conclude, the present study demonstrated that patients with FM had worse performances in all QOL dimensions of the SF-36 as well as higher overall scores on the PSQI and the TAS-20. In addition, patients with FM scored significantly higher in all specific domains of the PSQI and the TAS-20. Therefore, broader evaluations using accessible and adequate questionnaires are valuable for characterizing the impact of FM on patients. Because FM has a multifactorial etiology and variable clinical presentations, more careful investigation of other important and frequently underdiagnosed symptoms in this population, such as sleep complaints and alexithymia, which occur in addition to pain complaints, is highly encouraged.

Acknowledgments

The authors thank Mr. Jose Antonio Cordeiro for providing help with the statistical analysis.

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Received: December 20, 2013; Accepted: March 26, 2014

* Corresponding author. E-mail: filho.gerardo@gmail.com (G.M. de Araujo Filho).

Conflicts of interest

The authors declare no conflicts of interest.

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