The clinical course of polymyalgia rheumatica in Chinese

Clin Rheumatol. 2010 Feb;29(2):199-203. doi: 10.1007/s10067-009-1315-8. Epub 2009 Nov 15.

Abstract

Polymyalgia rheumatica (PMR) is diagnosed based on clinical features that may overlap with other rheumatic conditions like rheumatoid arthritis (RA). Furthermore, a proportion of PMR patients may subsequently evolve into RA. The aim of this study was to examine the clinical characteristics of PMR patients in a Chinese cohort compared to a Caucasian series. Patients diagnosed to have PMR during 1997-2008 were reviewed for clinical features and compared to a reported Caucasian series. Rheumatoid factor (RF) and anticyclic citrullinated peptide (CCP) antibodies were determined by immunonephelometry and enzyme-linked immunosorbent assay, respectively. Forty-four patients of southern Chinese origin were diagnosed to have PMR according to specialist opinion. Seventy-five percent of patients (n = 33) were >65 years of age at diagnosis (mean +/- standard deviation, 75.8 +/- 9.6 years). The commonest feature at disease onset was elevated erythrocyte sedimentation rate >40 mm/h (100% vs. 95.7%; p = 0.17) and bilateral shoulder pain or stiffness (95.5% vs. 90.8%; p = 0.31), comparable in frequency to the Caucasian cohort. However, Chinese patients had significantly longer duration of symptoms before diagnosis (p < 0.001) but less bilateral upper arm tenderness (p < 0.001) and generalized stiffness (p = 0.01). Twelve (27.3%) patients evolved into RA after a median duration of 2 months from onset of PMR. RF and anti-CCP antibodies were positive in 66.7% and 60% of these patients compared to 9.4% and 6.2%, respectively, among those who did not evolve into RA during the period observed. Chinese patients with PMR have modestly different clinical profile compared to the Caucasian counterpart. RF and anti-CCP antibodies were more likely to be present in those who subsequently developed into RA.

Publication types

  • Comparative Study

MeSH terms

  • Age of Onset
  • Aged
  • Aged, 80 and over
  • Anti-Inflammatory Agents / therapeutic use
  • Arthritis, Rheumatoid / diagnosis
  • Asian People
  • Autoantibodies / blood
  • Blood Sedimentation / drug effects
  • Disease Progression*
  • Enzyme-Linked Immunosorbent Assay
  • Female
  • Humans
  • Kaplan-Meier Estimate
  • Male
  • Middle Aged
  • Polymyalgia Rheumatica / blood
  • Polymyalgia Rheumatica / diagnosis
  • Polymyalgia Rheumatica / drug therapy
  • Polymyalgia Rheumatica / ethnology*
  • Prednisolone / therapeutic use*
  • Rheumatoid Factor / blood
  • Statistics, Nonparametric
  • White People / ethnology

Substances

  • Anti-Inflammatory Agents
  • Autoantibodies
  • Rheumatoid Factor
  • Prednisolone