A case of a drug reaction to sulfasalazine in a patient infected with HIV

Introduction The diagnosis of drug reaction with eosinophilia and systemic symptoms (DRESS) in human immunodeficiency virus (HIV) patients on multiple drugs with concomitant disorders presents a diagnostic challenge. Patient presentation We describe a case of a drug reaction to sulfasalazine in a 46 year old HIV-infected female with concurrent rheumatoid arthritis which presented atypically with a marked peripheral blood plasmacytosis mimicking a lymphoproliferative neoplasm. Management and outcome A diagnosis of DRESS was made in conjunction with the laboratory and clinical presenting findings. Sulfasalazine was immediately discontinued. The mucocutaneous rash and systemic symptoms (which included fever, lymphadenopathy and multi-organ dysfunction) resolved with supportive treatment. This included topical and systemic corticosteroids. Conclusion In conclusion, it is important to consider drug reactions when evaluating patients infected with HIV.


Introduction
Drug reaction with eosinophilia and systemic symptoms (DRESS) is a severe adverse drug reaction. Drug hypersensitivity reactions are common in patients infected with human immunodeficiency virus (HIV), secondary to drugs prescribed for the treatment of HIV and for the prevention of opportunistic illnesses. The diagnosis of DRESS in HIV patients on multiple drugs with concomitant disorders presents a challenge. We present an unusual case of a drug reaction to sulfasalazine in a patient infected with HIV with concurrent rheumatoid arthritis (RA), which presented as a marked peripheral blood plasmacytosis.

Case report
A 46-year-old female patient with RA, known to the Charlotte Maxeke Academic Hospital's rheumatology outpatient department, presented with a one-week history of fever (> 38 °C) and a generalised skin rash requiring hospitalisation. She gave a history of starting sulfasalazine two weeks prior, for the management of RA. She had no known allergies. On past medical history, she was also HIV-positive with an absolute CD4+ count of 411 cells/µL and a lower than detectable viral load. Other chronic medications (for > 3 months) included hydroxychloroquine for RA, risperidone for psychiatric manifestations of HIV, and antiretroviral therapy, namely tenofovir, lopinavir with ritonavir, and lamivudine. On examination, she was found to have significant (> 1.5 cm) bilateral cervical and left submental lymphadenopathy associated with severe periorbital oedema. On skin and mucosal examination, her palms and soles were indurated, her lips showed superficial mucosal erosions and there were widespread urticarial papules and target lesions on her face, trunk and extremities. A differential diagnosis including erythema multiforme major, vasculitis and acute drug eruptions such as Steven-Johnson Syndrome and toxic epidermal necrolysis were considered.
Baseline laboratory investigations were performed ( Table 1). The full blood count (FBC) revealed a leucocytosis with a lymphocytosis and eosinophilia. The peripheral blood smear (PBS) demonstrated 31% atypical lymphocytes and plasmacytoid lymphocytes ( Figure 1). A lymphoproliferative neoplasm associated with HIV infection was considered. Flow cytometry of the peripheral blood was performed. Immunophenotypic analysis revealed a population of 20% -25% reactive plasma cells with a range of CD138 (dim to +++) expression ( Figure 2) and no light chain restriction ( Figure 3). In addition, there were ~26% -28% reactive T-cells and ~8% polyclonal B-cells ( Figure 3). Polymerase chain reaction analysis for the immunoglobulin heavychain gene rearrangement studies was polyclonal. These findings demonstrate no evidence of a B-cell lymphoproliferative disorder.

Introduction:
The diagnosis of drug reaction with eosinophilia and systemic symptoms (DRESS) in human immunodeficiency virus (HIV) patients on multiple drugs with concomitant disorders presents a diagnostic challenge.

Patient presentation:
We describe a case of a drug reaction to sulfasalazine in a 46 year old HIV-infected female with concurrent rheumatoid arthritis which presented atypically with a marked peripheral blood plasmacytosis mimicking a lymphoproliferative neoplasm.

Management and outcome:
A diagnosis of DRESS was made in conjunction with the laboratory and clinical presenting findings. Sulfasalazine was immediately discontinued. The mucocutaneous rash and systemic symptoms (which included fever, lymphadenopathy and multi-organ dysfunction) resolved with supportive treatment. This included topical and systemic corticosteroids.

Conclusion:
In conclusion, it is important to consider drug reactions when evaluating patients infected with HIV.

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Further laboratory and radiologic investigations supported the diagnosis of DRESS Syndrome (Table 2). 1 The chest X-ray revealed bilateral interstitial lung infiltrates in keeping with pneumonitis. The liver function tests (LFT) were abnormal (Table 1). Serology for hepatitis studies was negative. Additional viral studies and a skin biopsy were not performed, at the discretion of the treating physician.
Sulfasalazine was immediately discontinued. Administration of promethazine, montelukast as well as intravenous and topical hydrocortisone led to a dramatic improvement. The clinical manifestations resolved and the patient was discharged. On outpatient follow-up, laboratory investigations, namely FBC, PBS and LFT, had returned to baseline.

Ethical consideration
Ethics was indeed obtained from the University of the Witwatersrand's ethics committee. This was a retrospective case report and consent was therefore not a requirement.

Discussion
Drug reaction with eosinophilia and systemic symptoms, also known as drug-induced hypersensitivity syndrome, is an adverse drug reaction commonly associated with numerous drug classes, including anticonvulsants, sulphonamides, antidepressants, anti-inflammatory drugs, antibiotics, angiotensin-converting enzymes and beta blockers. 1 The last drug prescribed may not always be the offending drug, as the hypersensitivity reaction has a delayed onset of up to three months. This is often difficult in patients infected with HIV on multiple drugs. Further, these patients are at high risk of developing concomitant opportunistic infections, and DRESS often mimics non-specific infections. It is thus always important to keep drug history in mind when evaluating patients infected with HIV.

Investigations Result (reference range)
White blood cell count 41.1 × 10 9 /L (3.9-12.9) Neutrophils 17.6 × 10 9 /L (1.6-8. Drug hypersensitivity reactions are common in patients infected with HIV. Drugs prescribed for the treatment of HIV, namely reverse transcriptase inhibitors and protease inhibitors, as well as drugs for the prevention of opportunistic illnesses, namely sulphonamides, dapsone and anti-tuberculosis drugs, predispose these patients to drug reactions. 2,3 In addition, there are numerous reports of adverse drug hypersensitivity reactions in this patient population to other drug classes. Drug reaction with eosinophilia and systemic symptoms associated with sulfasalazine in a patient infected with HIV to our knowledge has not been previously reported. Sulfasalazine is a modified sulphonamide composed of sulfapyridine covalently linked to 5-aminosalacyclic acid for the treatment of ulcerative colitis and RA. The pathogenesis of DRESS is not fully understood. In most drugs implicated in DRESS, an association with lymphocyte activation, genetic drug metabolising enzyme defects or eosinophilic tissue infiltration has been described. 4,5 A deficiency of detoxifying enzymes results in the accumulation of drug metabolites. 4 Certain human leucocyte antigen (HLA) alleles may predispose to drug reactions because of naïve T-cells recognising a HLA-hapten complex on an antigen-presenting cell with a subsequent hyperactive immune response. 2 More recently, reactivation of human herpes virus family has been associated with the diagnosis of a more severe form of DRESS, namely drug-induced hypersensitivity syndrome. 6 The diagnosis of DRESS is based on laboratory and clinical criteria. However, there is a significant overlap with other reactive and malignant disorders. Classical haematologic abnormalities include a leucocytosis, eosinophilia and atypical lymphocytosis. 7 Reactive plasma cells in the peripheral blood have been described in single case reports; however, a marked plasmacytosis as described in this case is rare. A marked peripheral blood plasmacytosis is characteristically associated with haematological malignancies such as plasma cell neoplasms and terminally differentiated mature lymphoproliferative B-cell neoplasms.
In the setting of HIV, plasmacytoid and atypical lymphocytes are frequently described; however, plasma cells on PBS are also a rare finding. 8 Infections with other viruses such as Epstein-Barr virus, parvovirus, hepatitis or cytomegalovirus should also be excluded.
The most common clinical findings are a mucocutaneous rash with or without systemic symptoms which include fever, lymphadenopathy and multi-organ dysfunction. As described in this patient, the most commonly involved internal organ is the liver. 5 Other organs such as the kidney, lungs, heart or central nervous system are rarely involved. 3 This is associated with a significant morbidity and a mortality of up to 10%, if the precipitating drug is not immediately discontinued. 3 Supportive treatment, which depends on the severity of the clinical signs, is the mainstay of treatment. Isolated mucocutaneous involvement usually responds to topical corticosteroids, whereas systemic corticosteroids may be indicated in the presence of severe mucocutaneous lesions or other organ involvement. The role for systemic corticosteroids in patients with liver impairment, however, is not well established. 4 Counselling of family members for a possible genetic susceptibility to DRESS is also advised.
In conclusion, this case report describes a drug reaction to sulfasalazine which presented atypically with a marked peripheral blood plasmacytosis mimicking a lymphoproliferative neoplasm. The diagnosis of DRESS in HIV-positive patients on multiple drugs with concomitant disorders presents a diagnostic dilemma. It is important to consider drug reactions when evaluating patients infected with HIV. †, Three out of four of the RegiSCAR criteria are required for the diagnosis of DRESS; ‡, Seven out of ten of the Japanese groups' criteria are required for the diagnosis of DRESS.