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  • Title: Polymyalgia rheumatica in patients with a normal erythrocyte sedimentation rate.
    Author: Helfgott SM, Kieval RI.
    Journal: Arthritis Rheum; 1996 Feb; 39(2):304-7. PubMed ID: 8849384.
    Abstract:
    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.
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