title: Fibromyalgia with chronic rheumatic diseases in South Korea: a comparison of clinical and American College of Rheumatology criteria.
abstract: OBJECTIVE
  To describe the prevalence and characteristics of fibromyalgia (FM) in patients with underlying rheumatic disease, and to compare it by three different measures.
  
  
  METHODS
  We studied 546 patients with chronic rheumatic diseases who attended our rheumatology clinic. If patients answered all of a screening questionnaire with yes, then we considered patients to be having widespread pain as assessed by the fibromyalgia impact questionnaire (FIQ), widespread pain index (WPI), and symptom severity (SS). A physician administered the tender point (TP) exam and clinician's judgment of FM. We collected demographics, clinical and laboratory features.
  
  
  RESULTS
  One hundred and sixty-four (30.0%) patients among 546 cases had a further exam. The male-to-female count was 25 : 139. The mean age was 49.7 years, disease duration 3.7 years, TP counts 4.2, FIQ score 47.0 and WPI with SS score was 11.1. We classified 17 patients (10.4%) with concomitant FM with widespread pain by tender point exam, 56 patients (34.2%) by WPI with SS, and 36 patients (22.0%) by a clinician's judgment. A total of 70.6% (n = 12) of those classified as FM by 1990 American College of Rheumatology (ACR) criteria wee categorized as FM by clinician's judgment, while 33.3% by clinician's judgment were classified by 1990 ACR criteria.
  
  
  CONCLUSIONS
  We found a 10.4~34.2% prevalence of concomitant FM in the patients with chronic widespread pain. The 1990 ACR criteria were the most restrictive except for SLE. Although The 2010 ACR criteria had a wide spectrum, it can be used for FM diagnosis even in the patient with underlying rheumatic diseases.
authors.affiliation: Division of Rheumatology, Department of Internal Medicine, Gachon University Gil Medical Center, Incheon, Korea.
authors.forename: Hyo Jin
authors.initials: HJ
authors.lastname: Choi
authors.affiliation: Division of Rheumatology, Department of Internal Medicine, Gachon University Gil Medical Center, Incheon, Korea.
authors.forename: Jung Yoon
authors.initials: JY
authors.lastname: Han
authors.affiliation: Division of Rheumatology, Department of Internal Medicine, Gachon University Gil Medical Center, Incheon, Korea.
authors.forename: Mi Ryoung
authors.initials: MR
authors.lastname: Seo
authors.affiliation: Division of Rheumatology, Department of Internal Medicine, Gachon University Gil Medical Center, Incheon, Korea.
authors.forename: Hee Jung
authors.initials: HJ
authors.lastname: Ryu
authors.affiliation: Division of Rheumatology, Department of Internal Medicine, Gachon University Gil Medical Center, Incheon, Korea.
authors.forename: Han Joo
authors.initials: HJ
authors.lastname: Baek
mesh_terms: D000328:Adult; D059350:Chronic Pain / Q000175:diagnosis* / Q000453:epidemiology* / Q000503:physiopathology; D005260:Female; D005356:Fibromyalgia / Q000175:diagnosis* / Q000453:epidemiology* / Q000503:physiopathology; D006801:Humans; D008297:Male; D008875:Middle Aged; D010147:Pain Measurement; D017288:Pain Threshold; D011237:Predictive Value of Tests; D015995:Prevalence; D011446:Prospective Studies; D056910:Republic of Korea / Q000453:epidemiology; D012216:Rheumatic Diseases / Q000175:diagnosis* / Q000453:epidemiology* / Q000503:physiopathology; D012720:Severity of Illness Index; D011795:Surveys and Questionnaires
keywords: South Korea; clinician's or American College of Rheumatology criteria; concomitant rheumatic disease; fibromyalgia