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Polymyalgia rheumatica

https://doi.org/10.1016/j.berh.2004.06.003Get rights and content

Abstract

Polymyalgia rheumatica (PMR) is an inflammatory condition of unknown etiology characterized by aching and stiffness in the shoulder and in the pelvic girdles and neck.

In the past, PMR was considered a manifestation of giant cell arteritis (GCA) or a variant of elderly-onset rheumatoid arthritis (EORA). The current diagnostic criteria for PMR were empirically formulated by clinical experts who had studied the disease extensively. Arthroscopic, radioisotopic and magnetic resonance imaging studies all have indicated the presence of a synovitis in proximal joints and periarticular structures. The synovitis is probably responsible for the musculoskeletal symptoms in PMR. The prominence assigned to the proximal symptoms has probably overshadowed the less well recognized and more variable distal musculoskeletal manifestations which are present in about half of the cases. A normal erythrocyte sedimentation rate does not exclude a diagnosis of PMR. C-reactive protein and interleukin-6 seem to be more sensitive indicators of disease activity both at diagnosis and during relapse/recurrence. Corticosteroids are the drugs of choice for treating PMR. A course of treatment of 1–2 years is often required. However, some patients have a chronic, relapsing course and require low doses of corticosteroids for several years. Large, multicenter, double-blind, placebo-controlled studies are required to define the role of methotrexate and anti-TNF-α agents as corticosteroid-sparing drugs in PMR.

Section snippets

Epidemiology and diagnostic criteria

Few population-based studies have evaluated the epidemiological aspects of PMR because of the lack of a diagnostic hallmark and universally accepted diagnostic and classification criteria. PMR is a common illness in certain populations, with a prevalence of one case for every 133 people over the age of 50 years.8 Like GCA, PMR is extremely rare in persons under 50. The incidence of PMR increases with age, with a peak in those 70–80 years of age. PMR is more frequent in females than in males in

Etiology, pathogenesis and pathology

PMR is probably a polygenic disease in which multiple environmental and genetic factors influence susceptibility and severity. The increased incidence at higher latitudes, in Scandinavian countries, and in the USA communities with a strong Scandinavian ethnic background (Table 1), as well as occasional familial cases, support the evidence for environmental and genetic causes.8., 9., 10., 11., 12., 13., 14., 15., 22.

A viral cause has been suspected but not confirmed in PMR and GCA. The sudden

Relationship between polymyalgia rheumatica and giant cell arteritis

Population-based studies of PMR have demonstrated the presence of biopsy-proven GCA in 16–21% of patients.8., 39. Conversely, symptoms of PMR have been observed in 40–60% of patients with GCA in clinical series.16

PMR may begin before, appear simultaneously with, or develop after GCA clinical manifestations. Prompt recognition of GCA is important in PMR patients because blindness may occur abruptly without premonitory symptoms. The overall risk of blindness in patients with ‘pure’ PMR was

Clinical manifestations

The combination of persistent pain (at least 1 month) with aching and morning stiffness in neck, shoulder and pelvic girdles lasting 30 minutes or more, plus evidence of systemic involvement—such as an erythrocyte sedimentation rate (ESR) elevated to 40 mm/hour or more—is strongly suggestive of PMR.1., 17., 18., 19. In patients with PMR the discomfort is bilateral; it involves the proximal limb and joint areas. The musculoskeletal pain is worse with movement of the affected area and usually

Laboratory

An ESR of at least 40 mm/hour is considered an important finding for the diagnosis of PMR. Some studies have reported that a normal ESR at diagnosis accounted for 7–20% of the patients with PMR.47., 48., 49., 50. C-reactive protein (CRP) is a sensitive and direct measure of the acute phase response as it is not influenced by the number or shape of erythrocytes, circulating immunoglobulins, hypercholesterolemia or renal function. CRP has been found to be a more sensitive indicator of disease

Imaging

The presence of proximal synovitis in PMR has been proved using different techniques such as scintigraphy, MRI and ultrasonography (US).34., 35., 56. US and MRI studies of the shoulders have shown that subacromial-subdeltoid bursitis is the most frequent lesion, present in almost all of the patients with PMR (Figure 2A and B). A recent case-control study demonstrated that US and MRI were equally effective in confirming bilateral subacromial and subdeltoid bursitis in PMR.56 The US evidence of

Treatment and course

Corticosteroids (CSs) are the drugs of choice for treating PMR. An initial dose of 10–20 mg/day of prednisone or equivalent is adequate, in most cases, in the absence of associated GCA. In some patients with mild disease a short course with non-steroidal anti-inflammatory drugs (NSAIDs) may be tried. If NSAIDs do not adequately control PMR clinical manifestations in 2–4 weeks, CS should be started. Usually, the response to CS is rapid, with complete or nearly complete resolution of symptoms

Polymyalgia rheumatica, RS3PE syndrome and elderly-onset rheumatoid arthritis (EORA)

Distal symptoms of PMR have been underestimated, and a diagnosis of RA or other syndromes is often made to explain these findings when they occur. The occurrence of peripheral arthritis, particularly in both hands, may create some difficulties in the differential diagnosis between PMR and elderly-onset rheumatoid arthritis (EORA). Pronounced symmetrical peripheral involvement, seropositivity, and the development of joint erosions and extra-articular manifestations differentiate RA from PMR.

Differential diagnosis

A wide variety of conditions, including other rheumatic diseases76., 77., may mimic the clinical picture of PMR.

Systemic lupus erythematosus (SLE) in the elderly may sometimes present as PMR.78 In these cases, the presence of pleuritis or pericarditis—common in late-onset SLE—and hematological abnormalities such as leukopenia or thrombocytopenia should raise the suspicion of SLE. Because the frequency of positive antinuclear antibodies (ANA) increases with age, a positive ANA by itself does not

Summary

Polymyalgia rheumatica (PMR) is an inflammatory condition of unknown etiology characterized by aching and stiffness in the shoulder and in the pelvic girdles and neck. PMR is related to giant cell arteritis (GCA), both conditions sometimes occurring in the same patient.

PMR is a common illness in certain populations, with a prevalence of one case for every 133 people over the age of 50 years. Like GCA, PMR is extremely rare in persons under 50. The incidence of PMR increases with age, with a

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