Approach Considerations
Patients with fibromyalgia do not have characteristic or consistent abnormalities on laboratory testing. However, routine laboratory and imaging studies are important to help rule out diseases with similar manifestations and to assist in diagnosis of certain inflammatory diseases that frequently coexist with fibromyalgia. In addition to complete blood cell (CBC) count and differential count, basic metabolic panel, and urinalysis, the following limited evaluation is reasonable.
- Thyroid-stimulating hormone: Hypothyroidism shares many clinical features with fibromyalgia, especially diffuse muscle pain and fatigue
- Creatinine phosphokinase (CPK): This study is used to exclude inflammatory myopathies
- Erythrocyte sedimentation rate (ESR)
- Antinuclear antibodies (ANA)
- Rheumatoid factor
- Serum transferrin saturation and serum ferritin screening
- Antipolymer antibodies
The ESR is normal in patients with fibromyalgia. This contrasts with the high ESR in patients with inflammatory disorders (eg, elderly patients with polymyalgia rheumatica) or occult malignancy. A low-titer ANA level is common in the general population, so this finding may be of no clinical significance in a patient with fibromyalgia. However, a positive ANA in a patient with diagnostic features of systemic lupus erythematosus (SLE) or related autoimmune disorders is a significant finding, as many patients with fibromyalgia have comorbid SLE.
Many patients with rheumatoid arthritis (RA) have comorbid fibromyalgia. However, a positive result for rheumatoid factor does not support a diagnosis of RA in the absence of objective evidence of characteristic joint inflammation. A positive result for rheumatoid factor is diagnostically nonspecific in other clinical settings.
Laboratory sleep studies may be useful in patients whose sleep [#WorkupOtherTests]does not improve with the usual conservative measures (eg, elimination of caffeine, prescription of hypnotics or nighttime tricyclics). These studies can be performed as part of a formal assessment by a neurologist experienced in sleep disorders.
Serum transferrin saturation and serum ferritin screening can be useful for detecting the unusual cases of hemochromatosis in which patients present with diffuse arthralgias and myalgias. Consider screening with a serum transferrin saturation and a serum ferritin concentration in patients aged 40-60 years, especially those with small-joint arthropathy in the hands and/or calcium pyrophosphate dihydrate deposition disease (CPPD).
The antipolymer antibody assay is a blood test. Antipolymer antibodies are present in approximately 50% of patients with fibromyalgia. This biologic marker may provide conclusive evidence for a subgroup of people with fibromyalgia.
Carefully assess possible causal or perpetuating factors. Investigate psychological and sociocultural factors and identify any specific regional sources of ongoing nociceptive pain (eg, degenerative spondylosis, bursitis).
Self-report Forms
While waiting to see the physician, the patient, in a few minutes, can complete a simple self-report form[77] that incorporates visual analogue scales for pain and fatigue and a global self-assessment of overall status, along with validated scales for physical and psychological health status such as the following:
- Modified Health Assessment Questionnaire
- Fibromyalgia Impact Questionnaire
- Checklist of current symptoms
- Scales for helplessness and cognitive performance
Easily adaptable to a busy practice, the use of self-report forms provides information that is invaluable for the psychosocial assessment of pain, both for aiding with diagnosis and monitoring the response to therapy.
Psychometric Testing
Psychometric testing includes the following:
- Minnesota Multiphasic Personality Inventory
- Social Support Questionnaire
- Sickness Impact Profile
- Multidimensional Pain Inventory (MPI)
In multidisciplinary settings, information obtained from these tests is useful for a more comprehensive assessment. For example, subgroups of patients with chronic pain can be identified based on MPI responses that appear to predict response to interdisciplinary therapeutic interventions.
Yunus MB. Fibromyalgia and overlapping disorders: the unifying concept of central sensitivity syndromes. Semin Arthritis Rheum. Jun 2007;36(6):339-56. [Medline].
Burgmer M, Pogatzki-Zahn E, Gaubitz M, et al. Altered brain activity during pain processing in fibromyalgia. Neuroimage. Jan 15 2009;44(2):502-8. [Medline].
Gracely RH, Petzke F, Wolf JM, Clauw DJ. Functional magnetic resonance imaging evidence of augmented pain processing in fibromyalgia. Arthritis Rheum. May 2002;46(5):1333-43. [Medline].
Wolfe F, Cathey MA, Kleinheksel SM. Fibrositis (Fibromyalgia) in rheumatoid arthritis. J Rheumatol. Dec 1984;11(6):814-8. [Medline].
Buskila D, Press J, Abu-Shakra M. Fibromyalgia in systemic lupus erythematosus: prevalence and clinical implications. Clin Rev Allergy Immunol. Aug 2003;25(1):25-8. [Medline].
Thompson ME, Barkhuizen A. Fibromyalgia, hepatitis C infection, and the cytokine connection. Curr Pain Headache Rep. Oct 2003;7(5):342-7. [Medline].
Wolfe F, Smythe HA, Yunus MB, et al. The American College of Rheumatology 1990 Criteria for the Classification of Fibromyalgia. Report of the Multicenter Criteria Committee. Arthritis Rheum. Feb 1990;33(2):160-72. [Medline].
Chaitow L. Fibromyalgia and Muscle Pain. Thorsons Pub; 1995:1-205.
Clauw DJ. Fibromyalgia: more than just a musculoskeletal disease. Am Fam Physician. Sep 1 1995;52(3):843-51, 853-4. [Medline].
Merskey H. Classification of chronic pain: Description of chronic pain syndromes and definitions of pain terms. Pain. 1986;Suppl 3:S217.
Pillemer SR, Bradley LA, Crofford LJ, Moldofsky H, Chrousos GP. The neuroscience and endocrinology of fibromyalgia. Arthritis Rheum. Nov 1997;40(11):1928-39. [Medline].
Crofford LJ. The hypothalamic-pituitary-adrenal stress axis in fibromyalgia and chronic fatigue syndrome. Z Rheumatol. 1998;57 Suppl 2:67-71. [Medline].
Martinez-Lavin M. Biology and therapy of fibromyalgia. Stress, the stress response system, and fibromyalgia. Arthritis Res Ther. 2007;9(4):216. [Medline].
Tanriverdi F, Karaca Z, Unluhizarci K, et al. The hypothalamo-pituitary-adrenal axis in chronic fatigue syndrome and fibromyalgia syndrome. Stress. Mar 2007;10(1):13-25. [Medline].
van Middendorp H, Lumley MA, Jacobs JW, Bijlsma JW, Geenen R. The effects of anger and sadness on clinical pain reports and experimentally-induced pain thresholds in women with and without fibromyalgia. Arthritis Care Res (Hoboken). Oct 2010;62(10):1370-6. [Medline].
Jones KD, Deodhar P, Lorentzen A, Bennett RM, Deodhar AA. Growth hormone perturbations in fibromyalgia: a review. Semin Arthritis Rheum. Jun 2007;36(6):357-79. [Medline].
Clauw DJ. Fibromyalgia: update on mechanisms and management. J Clin Rheumatol. Apr 2007;13(2):102-9. [Medline].
Staud R, Robinson ME, Vierck CJ Jr, et al. Diffuse noxious inhibitory controls (DNIC) attenuate temporal summation of second pain in normal males but not in normal females or fibromyalgia patients. Pain. Jan 2003;101(1-2):167-74. [Medline].
Staud R, Spaeth M. Psychophysical and neurochemical abnormalities of pain processing in fibromyalgia. CNS Spectr. Mar 2008;13(3 Suppl 5):12-7. [Medline].
Wood PB, Schweinhardt P, Jaeger E, et al. Fibromyalgia patients show an abnormal dopamine response to pain. Eur J Neurosci. Jun 2007;25(12):3576-82. [Medline].
Sarchielli P, Di Filippo M, Nardi K, Calabresi P. Sensitization, glutamate, and the link between migraine and fibromyalgia. Curr Pain Headache Rep. Oct 2007;11(5):343-51. [Medline].
Diatchenko L, Slade GD, Nackley AG, et al. Genetic basis for individual variations in pain perception and the development of a chronic pain condition. Hum Mol Genet. Jan 1 2005;14(1):135-43. [Medline].
Clauw DJ. Pharmacotherapy for patients with fibromyalgia. J Clin Psychiatry. 2008;69 Suppl 2:25-9. [Medline].
Winfield JB. Psychological determinants of fibromyalgia and related syndromes. Curr Rev Pain. 2000;4(4):276-86. [Medline].
Tander B, Gunes S, Boke O, et al. Polymorphisms of the serotonin-2A receptor and catechol-O-methyltransferase genes: a study on fibromyalgia susceptibility. Rheumatol Int. May 2008;28(7):685-91. [Medline].
Russell IJ, Orr MD, Littman B, et al. Elevated cerebrospinal fluid levels of substance P in patients with the fibromyalgia syndrome. Arthritis Rheum. Nov 1994;37(11):1593-601. [Medline].
Griep EN, Boersma JW, de Kloet ER. Altered reactivity of the hypothalamic-pituitary-adrenal axis in the primary fibromyalgia syndrome. J Rheumatol. Mar 1993;20(3):469-74. [Medline].
Crofford LJ. Neuroendocrine aspects of fibromyalgia. J Musculoskelet Pain. 1994;2:125-33.
Cuatrecasas G, Riudavets C, Güell MA, Nadal A. Growth hormone as concomitant treatment in severe fibromyalgia associated with low IGF-1 serum levels. A pilot study. BMC Musculoskelet Disord. Nov 30 2007;8:119. [Medline]. [Full Text].
Glass JM. Fibromyalgia and cognition. J Clin Psychiatry. 2008;69 Suppl 2:20-4. [Medline].
Glass JM, Williams DA, Fernandez-Sanchez ML, Kairys A, Barjola P, Heitzeg MM, et al. Executive function in chronic pain patients and healthy controls: different cortical activation during response inhibition in fibromyalgia. J Pain. Dec 2011;12(12):1219-29. [Medline].
Lue FA. Sleep and fibromyalgia. J Musculoskelet Pain. 1994;2:89-100.
WebSciences International and Sleep Research Society (United States). Basics of Sleep Behavior. Available at http://www.sleephomepages.org/sleepsyllabus/.
Engel GL. The need for a new medical model: a challenge for biomedicine. Science. Apr 8 1977;196(4286):129-36. [Medline].
Arnold LM, Hudson JI, Hess EV, Ware AE, Fritz DA, Auchenbach MB, et al. Family study of fibromyalgia. Arthritis Rheum. Mar 2004;50(3):944-52. [Medline].
Olson J. Mapping Genes for Fibromyalgia. National Institute of Arthritis and Musculoskeletal and Skin Diseases; Aug 2004. Spotlight on Research, Fibromyalgia: Summaries of Research. [Full Text].
Diatchenko L, Nackley AG, Slade GD, et al. Idiopathic pain disorders--pathways of vulnerability. Pain. Aug 2006;123(3):226-30. [Medline].
Buskila D, Sarzi-Puttini P. Biology and therapy of fibromyalgia. Genetic aspects of fibromyalgia syndrome. Arthritis Res Ther. Jul 28 2006;8(5):218.
Offenbaecher M, Bondy B, de Jonge S, Glatzeder K, Krüger M, Schoeps P, et al. Possible association of fibromyalgia with a polymorphism in the serotonin transporter gene regulatory region. Arthritis Rheum. Nov 1999;42(11):2482-8. [Medline].
Diatchenko L, Nackley AG, Slade GD, Bhalang K, Belfer I, Max MB, et al. Catechol-O-methyltransferase gene polymorphisms are associated with multiple pain-evoking stimuli. Pain. Dec 5 2006;125(3):216-24. [Medline].
Fillingim RB, Maixner W. Gender differences in the responses to noxious stimuli. Pain Forum. 1995;4:209-221.
Moldofsky H, Scarisbrick P, England R, et al. Musculosketal symptoms and non-REM sleep disturbance in patients with "fibrositis syndrome" and healthy subjects. Psychosom Med. Jul-Aug 1975;37(4):341-51. [Medline].
Schrader H, Obelieniene D, Bovim G, Surkiene D, Mickeviciene D, Miseviciene I, et al. Natural evolution of late whiplash syndrome outside the medicolegal context. Lancet. May 4 1996;347(9010):1207-11. [Medline].
Buskila D, Neumann L, Vaisberg G, Alkalay D, Wolfe F. Increased rates of fibromyalgia following cervical spine injury. A controlled study of 161 cases of traumatic injury. Arthritis Rheum. Mar 1997;40(3):446-52. [Medline].
Obelieniene D, Schrader H, Bovim G, Miseviciene I, Sand T. Pain after whiplash: a prospective controlled inception cohort study. J Neurol Neurosurg Psychiatry. Mar 1999;66(3):279-83. [Medline].
Tishler M, Levy O, Maslakov I, Bar-Chaim S, Amit-Vazina M. Neck injury and fibromyalgia-- are they really associated?. J Rheumatol. Jun 2006;33(6):1183-5. [Medline].
Shir Y, Pereira JX, Fitzcharles MA. Whiplash and fibromyalgia: an ever-widening gap. J Rheumatol. Jun 2006;33(6):1045-7. [Medline].
Van Houdenhove B, Egle UT. Fibromyalgia: a stress disorder? Piecing the biopsychosocial puzzle together. Psychother Psychosom. Sep-Oct 2004;73(5):267-75. [Medline].
Van Houdenhove B, Luyten P. Beyond dualism: the role of life stress in chronic pain. Pain. Jan 2005;113(1-2):238-9; discussion 240-2. [Medline].
Crombez G, Eccleston C, Van den Broeck A, et al. Hypervigilance to pain in fibromyalgia: the mediating role of pain intensity and catastrophic thinking about pain. Clin J Pain. Mar-Apr 2004;20(2):98-102. [Medline].
Keefe FJ, Lefebvre JC, Maixner W, Salley AN Jr, Caldwell DS. Self-efficacy for arthritis pain: relationship to perception of thermal laboratory pain stimuli. Arthritis Care Res. Jun 1997;10(3):177-84. [Medline].
Gracely RH, Geisser ME, Giesecke T, Grant MA, Petzke F, Williams DA, et al. Pain catastrophizing and neural responses to pain among persons with fibromyalgia. Brain. Apr 2004;127:835-43. [Medline].
Bradley LA. Psychiatric comorbidity in fibromyalgia. Curr Pain Headache Rep. Apr 2005;9(2):79-86. [Medline].
Arnold LM, Hudson JI, Keck PE, Auchenbach MB, Javaras KN, Hess EV. Comorbidity of fibromyalgia and psychiatric disorders. J Clin Psychiatry. Aug 2006;67(8):1219-25. [Medline].
Giesecke T, Williams DA, Harris RE, Cupps TR, Tian X, Tian TX, et al. Subgrouping of fibromyalgia patients on the basis of pressure-pain thresholds and psychological factors. Arthritis Rheum. Oct 2003;48(10):2916-22. [Medline].
Giesecke T, Gracely RH, Williams DA, Geisser ME, Petzke FW, Clauw DJ. The relationship between depression, clinical pain, and experimental pain in a chronic pain cohort. Arthritis Rheum. May 2005;52(5):1577-84. [Medline].
Fassbender K, Samborsky W, Kellner M, Müller W, Lautenbacher S. Tender points, depressive and functional symptoms: comparison between fibromyalgia and major depression. Clin Rheumatol. Jan 1997;16(1):76-9. [Medline].
Hoffman DL, Dukes EM. The health status burden of people with fibromyalgia: a review of studies that assessed health status with the SF-36 or the SF-12. Int J Clin Pract. Jan 2008;62(1):115-26. [Medline].
Hassett AL. Psychosocial aspects of fibromyalgia: psychological stress, psychiatric morbidity, and personality subgroups. 2008;pp 55-61.
McBeth J, Macfarlane GJ, Benjamin S, Morris S, Silman AJ. The association between tender points, psychological distress, and adverse childhood experiences: a community-based study. Arthritis Rheum. Jul 1999;42(7):1397-404. [Medline].
Wolfe F, Ross K, Anderson J, Russell IJ, Hebert L. The prevalence and characteristics of fibromyalgia in the general population. Arthritis Rheum. Jan 1995;38(1):19-28. [Medline].
Buchwald D, Umali P, Umali J, Kith P, Pearlman T, Komaroff AL. Chronic fatigue and the chronic fatigue syndrome: prevalence in a Pacific Northwest health care system. Ann Intern Med. Jul 15 1995;123(2):81-8. [Medline].
Pawlikowska T, Chalder T, Hirsch SR, Wallace P, Wright DJ, Wessely SC. Population based study of fatigue and psychological distress. BMJ. Mar 19 1994;308(6931):763-6. [Medline].
White LA, Birnbaum HG, Kaltenboeck A, et al. Employees with fibromyalgia: medical comorbidity, healthcare costs, and work loss. J Occup Environ Med. Jan 2008;50(1):13-24. [Medline].
Arnold LM, Crofford LJ, Mease PJ, et al. Patient perspectives on the impact of fibromyalgia. Patient Educ Couns. Oct 2008;73(1):114-20. [Medline]. [Full Text].
Michels H, Gerhold K, Hafner R, et al. [Juvenile fibromyalgia syndrome]. Schmerz. Jun 2008;22(3):339-48. [Medline].
Yunus MB, Holt GS, Masi AT, et al. Fibromyalgia syndrome among the elderly. Comparison with younger patients. J Am Geriatr Soc. Nov 1988;36(11):987-95. [Medline].
Turk DC, Okifuji A, Sinclair JD, et al. Pain, disability, and physical functioning in subgroups of patients with fibromyalgia. J Rheumatol. Jul 1996;23(7):1255-62. [Medline].
Turk DC, Okifuji A, Sinclair JD, et al. Differential responses by psychosocial subgroups of fibromyalgia syndrome patients to an interdisciplinary treatment. Arthritis Care Res. Oct 1998;11(5):397-404. [Medline].
Dreyer L, Kendall S, Danneskiold-Samsoe B, Bartels EM, Bliddal H. Mortality in a cohort of Danish patients with fibromyalgia: increased frequency of suicide. Arthritis Rheum. Oct 2010;62(10):3101-8. [Medline].
Dick BD, Verrier MJ, Harker KT, Rashiq S. Disruption of cognitive function in fibromyalgia syndrome. Pain. Oct 31 2008;139(3):610-6. [Medline].
Crofford LJ. Violence, stress, and somatic syndromes. Trauma Violence Abuse. Jul 2007;8(3):299-313. [Medline].
Yunus MB. Fibromyalgia syndrome: clinical features and spectrum. J Musculoskelet Pain. 1994;2:5-21.
Yunus MB. Suffering, science, and sabotage. J Musculoskelet Pain. 2004;12(2):3-18.
Wolfe F, Clauw DJ, Fitzcharles MA, et al. Fibromyalgia criteria and severity scales for clinical and epidemiological studies: a modification of the ACR Preliminary Diagnostic Criteria for Fibromyalgia. J Rheumatol. Jun 2011;38(6):1113-22. [Medline].
Wolfe F, Clauw DJ, Fitzcharles MA, et al. The American College of Rheumatology preliminary diagnostic criteria for fibromyalgia and measurement of symptom severity. Arthritis Care Res (Hoboken). May 2010;62(5):600-10. [Medline].
Pincus T, Yazici Y, Bergman M. Development of a multi-dimensional health assessment questionnaire (MDHAQ) for the infrastructure of standard clinical care. Clin Exp Rheumatol. Sep-Oct 2005;23(5 Suppl 39):S19-28. [Medline].
Wood PB. Treating comorbidities in fibromyalgia. Pain Pract. 2008;18(1):pp 42-53.
Turk DC, Vierck CJ, Scarbrough E, et al. Fibromyalgia: combining pharmacological and nonpharmacological approaches to treating the person, not just the pain. J Pain. Feb 2008;9(2):99-104. [Medline].
Staud R. Treatment of fibromyalgia and its symptoms. Expert Opin Pharmacother. Aug 2007;8(11):1629-42. [Medline].
Sarzi-Puttini P, Buskila D, Carrabba M, et al. Treatment strategy in fibromyalgia syndrome: where are we now?. Semin Arthritis Rheum. Jun 2008;37(6):353-65. [Medline].
[Best Evidence] Carville SF, Arendt-Nielsen S, Bliddal H, et al. EULAR evidence-based recommendations for the management of fibromyalgia syndrome. Ann Rheum Dis. Apr 2008;67(4):536-41. [Medline].
Goldenberg DL. Pharmacological treatment of fibromyalgia and other chronic musculoskeletal pain. Best Pract Res Clin Rheumatol. Jun 2007;21(3):499-511. [Medline].
Goldenberg DL. Multidisciplinary modalities in the treatment of fibromyalgia. J Clin Psychiatry. 2008;69 Suppl 2:30-4. [Medline].
Burckhardt CS. Multidisciplinary approaches for management of fibromyalgia. Curr Pharm Des. 2006;12(1):59-66. [Medline].
[Best Evidence] Häuser W, Bernardy K, Arnold B, Offenbächer M, Schiltenwolf M. Efficacy of multicomponent treatment in fibromyalgia syndrome: a meta-analysis of randomized controlled clinical trials. Arthritis Rheum. Feb 15 2009;61(2):216-24. [Medline].
Benca RM, Ancoli-Israel S, Moldofsky H. Special considerations in insomnia diagnosis and management: depressed, elderly, and chronic pain populations. J Clin Psychiatry. 2004;65 Suppl 8:26-35. [Medline].
Bigatti SM, Hernandez AM, Cronan TA, et al. Sleep disturbances in fibromyalgia syndrome: relationship to pain and depression. Arthritis Rheum. Jul 15 2008;59(7):961-7. [Medline].
Moldofsky H. The significance, assessment, and management of nonrestorative sleep in fibromyalgia syndrome. CNS Spectr. Mar 2008;13(3 Suppl 5):22-6. [Medline].
[Best Evidence] Stephens S, Feldman BM, Bradley N, Schneiderman J, Wright V, Singh-Grewal D, et al. Feasibility and effectiveness of an aerobic exercise program in children with fibromyalgia: results of a randomized controlled pilot trial. Arthritis Rheum. Oct 15 2008;59(10):1399-406. [Medline].
Thieme K, Flor H, Turk DC. Psychological pain treatment in fibromyalgia syndrome: efficacy of operant behavioural and cognitive behavioural treatments. Arthritis Res Ther. 2006;8(4):R121. [Medline].
Thieme K, Turk DC, Flor H. Responder criteria for operant and cognitive-behavioral treatment of fibromyalgia syndrome. Arthritis Rheum. Jun 15 2007;57(5):830-6. [Medline].
[Best Evidence] Häuser W, Bernardy K, Uçeyler N, Sommer C. Treatment of fibromyalgia syndrome with antidepressants: a meta-analysis. JAMA. Jan 14 2009;301(2):198-209. [Medline].
Jones KD, Adams D, Winters-Stone K, Burckhardt CS. A comprehensive review of 46 exercise treatment studies in fibromyalgia (1988-2005). Health Qual Life Outcomes. Sep 25 2006;4:67. [Medline].
[Best Evidence] Busch AJ, Schachter CL, Overend TJ, et al. Exercise for fibromyalgia: a systematic review. J Rheumatol. Jun 2008;35(6):1130-44. [Medline].
[Best Evidence] Munguía-Izquierdo D, Legaz-Arrese A. Assessment of the effects of aquatic therapy on global symptomatology in patients with fibromyalgia syndrome: a randomized controlled trial. Arch Phys Med Rehabil. Dec 2008;89(12):2250-7. [Medline].
Bootzin RR, Lahmeyer HW, Lilie JK. Easy Steps to Help You Sleep. Chicago, Ill: Searle Pharmaceuticals; 1994:1-34.
Holman AJ, Myers RR. A randomized, double-blind, placebo-controlled trial of pramipexole, a dopamine agonist, in patients with fibromyalgia receiving concomitant medications. Arthritis Rheum. Aug 2005;52(8):2495-505. [Medline].
Rooks DS. Fibromyalgia treatment update. Curr Opin Rheumatol. Mar 2007;19(2):111-7. [Medline].
Logan AC. Is there a fibromyalgia diet. Fibromyalgia Aware. Dec 2004-Mar 2005;8:46-9.
Callahan LF, Freburger JK, Mielenz TJ, Wiley-Exley EK. Medical skepticism and the use of complementary and alternative health care providers by patients followed by rheumatologists. J Clin Rheumatol. Jun 2008;14(3):143-7. [Medline].
Winfield JB. Pain and arthritis. N C Med J. Nov-Dec 2007;68(6):444-6. [Medline].
Sadreddini S, Molaeefard M, Noshad H, et al. Efficacy of Raloxifen in treatment of fibromyalgia in menopausal women. Eur J Intern Med. Jul 2008;19(5):350-5. [Medline].
Broughton RJ, Fleming JA, George CF, et al. Randomized, double-blind, placebo-controlled crossover trial of modafinil in the treatment of excessive daytime sleepiness in narcolepsy. Neurology. Aug 1997;49(2):444-51. [Medline].
Schwartz TL, Rayancha S, Rashid A, et al. Modafinil treatment for fatigue associated with fibromyalgia. J Clin Rheumatol. Feb 2007;13(1):52. [Medline].
Skrabek RQ, Galimova L, Ethans K, et al. Nabilone for the treatment of pain in fibromyalgia. J Pain. Feb 2008;9(2):164-73. [Medline].
Scharf MB, Hauck M, Stover R, et al. Effect of gamma-hydroxybutyrate on pain, fatigue, and the alpha sleep anomaly in patients with fibromyalgia. Preliminary report. J Rheumatol. Oct 1998;25(10):1986-90. [Medline].
[Best Evidence] Russell IJ, Perkins AT, Michalek JE. Sodium oxybate relieves pain and improves function in fibromyalgia syndrome: a randomized, double-blind, placebo-controlled, multicenter clinical trial. Arthritis Rheum. Jan 2009;60(1):299-309. [Medline].
Gendreau RM, Thorn MD, Gendreau JF, Kranzler JD, Ribeiro S, Gracely RH, et al. Efficacy of milnacipran in patients with fibromyalgia. J Rheumatol. Oct 2005;32(10):1975-85. [Medline].
Arnold LM, Rosen A, Pritchett YL, D'Souza DN, Goldstein DJ, Iyengar S, et al. A randomized, double-blind, placebo-controlled trial of duloxetine in the treatment of women with fibromyalgia with or without major depressive disorder. Pain. Dec 15 2005;119(1-3):5-15. [Medline].
Arnold LM, Pritchett YL, D'Souza DN, Kajdasz DK, Iyengar S, Wernicke JF. Duloxetine for the treatment of fibromyalgia in women: pooled results from two randomized, placebo-controlled clinical trials. J Womens Health (Larchmt). Oct 2007;16(8):1145-56. [Medline].
Arnold LM. Duloxetine and other antidepressants in the treatment of patients with fibromyalgia. Pain Med. Sep 2007;8 Suppl 2:S63-74. [Medline].
Russell IJ, Mease PJ, Smith TR, Kajdasz DK, Wohlreich MM, Detke MJ, et al. Efficacy and safety of duloxetine for treatment of fibromyalgia in patients with or without major depressive disorder: Results from a 6-month, randomized, double-blind, placebo-controlled, fixed-dose trial. Pain. Jun 2008;136(3):432-44. [Medline].
Arnold LM, Goldenberg DL, Stanford SB, et al. Gabapentin in the treatment of fibromyalgia: a randomized, double-blind, placebo-controlled, multicenter trial. Arthritis Rheum. Apr 2007;56(4):1336-44. [Medline].
Crofford LJ, Rowbotham MC, Mease PJ, Russell IJ, Dworkin RH, Corbin AE, et al. Pregabalin for the treatment of fibromyalgia syndrome: results of a randomized, double-blind, placebo-controlled trial. Arthritis Rheum. Apr 2005;52(4):1264-73. [Medline].
Arnold LM, Russell IJ, Diri EW, Duan WR, Young JP Jr, Sharma U, et al. A 14-week, randomized, double-blinded, placebo-controlled monotherapy trial of pregabalin in patients with fibromyalgia. J Pain. Sep 2008;9(9):792-805. [Medline].
Crofford LJ, Mease PJ, Simpson SL, et al. Fibromyalgia relapse evaluation and efficacy for durability of meaningful relief (FREEDOM): a 6-month, double-blind, placebo-controlled trial with pregabalin. Pain. Jun 2008;136(3):419-31. [Medline].

