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Objective: To ascertain the frequency of polymyalgia rheumatica (PMR) with a normal erythrocyte sedimentation rate (ESR; < or =30 mm/hour) and to determine any defining clinical characteristics.

Methods: A retrospective chart review study of all patients meeting the clinical criteria for PMR seen over a 5-year period in a hospital and an office-based rheumatology practice.

Results: We evaluated 117 patients; 26 (22.2%) had a pretreatment ESR of < or =30 mm/hour (mean /- SD 19.8 /- 7.5 versus 74.4 /- 30.3 mm/hour for elevated ESR group; P < 0.0001). Of the 26 normal ESR patients, 15 (58%) were female compared with 74 of the 91 elevated ESR patients (81%) (P < 0.02, by Fisher's exact test). The mean hemoglobin concentration was significantly lower in the elevated ESR population (mean /- SD 1.23 /- 0.15 gm/liter versus 1.38 /- 0.11 gm/liter; P < 0.0001). The duration of symptoms prior to treatment with prednisone was significantly longer for patients with a normal ESR (149 /- 95 days versus 103 /- 95 days for elevated ESR patients; P <0.04).

Conclusion: In our series, PMR with a normal ESR accounted for approximately one-fifth of all PMR patients, more commonly in men. The lack of characteristically abnormal laboratory findings may result in a delay in the proper diagnosis and management of this condition.

(C) 1996, American College of Rheumatology