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Do patients on biologic drugs for rheumatic disease need PCP prophylaxis?

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References

PATIENT RISK FACTORS FOR PCP

Table 2. Risk factors for Pneumocystis jirovecii pneumonia in patients on biologic therapy for rheumatic disease
Certain clinical, laboratory, and pharmacologic factors are associated with increased risk of PCP (Table 2).3–6,9,17–19,21,22,27

Pulmonary disease, age, other factors

Komano et al,15 in their study of patients with rheumatoid arthritis treated with infliximab, found that 10 (48%) of 21 patients with PCP had preexisting pulmonary disease, compared with 11 (10.8%) of 102 patients without PCP (P < .001). Patients with PCP were older (mean age 64 vs 54, P < .001), were on higher median doses of prednisolone per day (7.5 vs 5 mg, P = .001), and had lower median serum immunoglobulin G (IgG) levels (944 vs 1,394 mg/dL, P < .001).15

Tadros et al13 performed a case-control study that also showed that patients with autoimmune disease who developed PCP had lower lymphocyte counts than controls on admission. Other risk factors included low CD4 counts and age older than 50.

Li et al17 found that patients with autoimmune or inflammatory disease with PCP were more likely to have low CD3, CD4, and CD8 cell counts, as well as albumin levels less than 28 g/L. They therefore suggested that lymphocyte subtyping may be a useful tool to guide PCP prophylaxis.

Granulomatosis with polyangiitis

Patients with granulomatosis with polyangiitis have a significantly higher incidence of PCP than patients with other connective tissue diseases.

Ward and Donald18 reviewed 223 cases of PCP in patients with connective tissue disease. The highest frequency (89 cases per 10,000 hospitalizations per year) was in patients with granulomatosis with polyangiitis, followed by 65 per 10,000 hospitalizations per year for patients with polyarteritis nodosa. The lowest frequency was in rheumatoid arthritis patients, at 2 per 10,000 hospitalizations per year. In decreasing order, diseases with significant associations with PCP were:

  • Polyarteritis nodosa (odds ratio [OR] 10.20, 95% confidence interval [CI] 5.69–18.29)
  • Granulomatosis with polyangiitis (OR 7.81, 95% CI 4.71–13.05)
  • Inflammatory myopathy (OR 4.44, 95% CI 2.67–7.38)
  • Systemic lupus erythematosus (OR 2.52, 95% CI 1.66–3.82).

Vallabhaneni and Chiller,26 in a meta-analysis including rheumatoid arthritis patients on biologics, did not find an increased risk of PCP (OR 1.77, 95% CI 0.42–7.47).

Park et al12 found that the highest incidences of PCP were in patients with granulomatosis with polyangiitis, microscopic polyangiitis, and systemic sclerosis. For systemic sclerosis, the main reason for giving high-dose glucocorticoids was interstitial lung disease.

Other studies19,20,28 also found an association with coexisting pulmonary disease in patients with rheumatoid arthritis.

CURRENT GUIDELINES

There are guidelines for primary and secondary prophylaxis of PCP in HIV-positive patients with CD4 counts less than 200/mm3 or a history of acquired immunodeficiency syndrome (AIDS)-defining illness.27 Additionally, patients with a CD4 cell percentage less than 14% should be considered for prophylaxis.27

Unfortunately, there are no guidelines for prophylaxis in patients taking immunosuppressants for rheumatic disease.

The recommended regimen for PCP prophylaxis in HIV-infected patients is trimethoprim-sulfamethoxazole, 1 double-strength or 1 single-strength tablet daily. Alternative regimens include 1 double-strength tablet 3 times per week, dapsone, aerosolized pentamidine, and atovaquone.27

There are also guidelines for prophylaxis in kidney transplant recipients, as well as for patients with hematologic malignancies and solid-organ malignancies, particularly those on chemotherapeutic agents and the T-cell-depleting agent alemtuzumab.29–31

Italian clinical practice guidelines for the use of tumor necrosis factor antagonists in inflammatory bowel disease recommend consideration of PCP prophylaxis in patients who are also on other immunosuppressants, particularly high-dose glucocorticoids.32

Prophylaxis has been shown to increase life expectancy and quality-adjusted life-years and to reduce cost for patients on immunosuppressive therapy for granulomatosis with polyangiitis.21 The European Society of Clinical Microbiology and Infectious Diseases recently produced consensus statements recommending PCP prophylaxis for patients on rituximab with other concomitant immunosuppressants such as the equivalent of prednisone 20 mg daily for more than 4 weeks.33 Prophylaxis was not recommended for other biologic therapies.34,35

THE RISKS OF PROPHYLAXIS

The risk of PCP should be weighed against the risk of prophylaxis in patients with rheumatic disease. Adverse reactions to sulfonamide antibiotics including disease flares have been reported in patients with systemic lupus erythematosus.36,37 Other studies have found no increased risk of flares in patients taking trimethoprim-sulfamethoxazole for PCP prophylaxis.12,38 A retrospective analysis of patients with vasculitis found no increased risk of combining methotrexate and trimethoprim-sulfamethoxazole.39

KEY POINTS

  • PCP is an opportunistic infection with a high risk of death.
  • PCP has been reported with biologics used as immunomodulators in rheumatic disease.
  • PCP prophylaxis should be considered in patients at high risk of PCP, such as those who have granulomatosis with polyangiitis, underlying pulmonary disease or who are concomitantly taking glucocorticoids.

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Laboratory tests in rheumatology: A rational approach

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