Is it Crohn's disease? A severe systemic granulomatous reaction to sulfasalazine in patient with rheumatoid arthritis
© Quallich et al; licensee BioMed Central Ltd. 2001
Received: 30 July 2001
Accepted: 29 August 2001
Published: 29 August 2001
Sulfasalazine is a widely used anti-inflammatory agent in the treatment of inflammatory bowel disease and several rheumatological disorders. Although as many as 20% of treated patients may experience reversible, dose-dependent side effects, less frequent but potentially severe, systemic reactions have also been reported.
A severe systemic reaction to sulfasalazine developed in a 21-year old female with rheumatoid arthritis characterized by eosinophilia, granulomatous enteritis and myelotoxicity, cholestatic hepatitis, and seizures. The clinical course and management of this patient are presented as well as a review of the incidence and outcome of severe systemic reactions to sulfasalazine.
Granulomatous myelotoxicity and enteritis developed in a 21 year old female within 3 weeks of initiating sulfasalazine for rheumatoid arthritis. Following a short course of corticosteroids, the patient had resolution of her cholestatic hepatitis, rash, eosinophilia, and gastrointestinal symptoms with no residual manifestations at 7 months follow-up. Although severe reactions to sulfasalazine are rare and unpredictable, practicing physicians should be aware of unusual clinical presentations of toxicity when prescribing sulfasalazine.
Sulfasalazine (SSZ) is a widely used and highly effective anti-inflammatory agent in the treatment of Crohn's disease and ulcerative colitis [1–3]. SSZ is also being used with increasing frequency in the treatment of various rheumatolgical disorders [4–7]. SSZ is preferred over other agents such as gold and penicillamine in rheumatology patients due to its more favorable side effect profile [8–10]. Nonetheless, rash, fever, and dyspepsia occur in 3% to 20% of treated patients [7, 11, 12]. These reactions are usually dose dependent and improve with dose reduction or discontinuation [7, 12]. However, more serious but less common side effects have also been reported [13–19]. We now report a severe systemic reaction to SSZ in a 21-year-old female with rheumatoid arthritis characterized by granulomatous infiltration of the bone marrow, colon and small bowel as well as cholestatic hepatitis and seizures.
A 21-year old female was diagnosed with polyarticular rheumatoid arthritis in 1997 and was managed with naprosyn (Naproxen, Roche Laboratories, Nutley, NJ) for 4 years. Joint inflammation was well controlled with hydroxychlorquine (Plaquenil, Sanofi Pharmaceuticals, New York, NY) from October 1999 thru June 2000 when hydroxychlorquine was discontinued due to persistent anemia and a flare in her arthritis despite adequate therapy. The patient was started on iron supplementation and a 4-week course of low dose prednisone in June/ July 2000. Due to persistent arthritis, sulfasalazine was initiated on July 28, 2000 at a dose of 500 mg twice daily, increasing to 1000 mg twice daily. Liver biochemistries were normal immediately before and two weeks after initiating SSZ. Three weeks after starting SSZ, the patient developed an erythematous rash over the upper extremities and trunk that improved with cetirizine (Zyrtec, Pfizer Inc, New York, NY). She then developed fatigue, abdominal pain, diarrhea, and night sweats which lead to hospitalization on 8/29/00 and SSZ was discontinued. At presentation, serum alkaline phosphatase was 923 IU/L, AST 105 IU/L, ALT 143 IU/L, bilirubin 4.3 mg/dl, and WBC was 9.6 k/l with 12% eosinophils. Over the next six days, she gained 20 pounds in fluid weight and had fevers of 103°F despite broad spectrum antibiotics. She was transferred on hospital day # 6 to the University of Michigan Medical Center for further evaluation and management.
The patient reported a prior history of infectious mononucleosis at age 18 and was a non-smoker and consumed alcohol infrequently. She denied any known drug allergies or prior exposure to sulfa containing medications or antibiotics. There was no family history of allergy to sulfa products.
On hospital day #6, the patient appeared toxic with a temperature of 102°F, pulse 154/min, and blood pressure of 100/58. Scleral icterus was present as well as deeply jaundiced, edematous skin with a macular, erythematous rash. Non-tender, 1–2 cm lymph nodes were palpated in the neck, axilla, and groin. There were decreased breath sounds with mild bibasilar rales and a hyperdynamic precordium. The abdomen was diffusely tender and distended. Rectal examination revealed brown hemoccult + stool. Neurologic examination was unremarkable.
Total WBC Count
Sulfasalazine is a widely used anti-inflammatory agent in the treatment of Crohn's disease and ulcerative colitis [1–3]. Recent data has demonstrated that SSZ is also safe and effective in the treatment of rheumatoid arthritis and other rheumatological disorders [4, 5]. Sulfasalazine is a dimer composed of 5-aminosalicylic acid linked by an azo bond to sulfapyridine. The anti-inflammatory activity of SSZ is due to the 5-aminosalicylic acid component while the majority of the adverse side effects have been attributed to the sulfapyridine moiety [14–16]. Fever, abdominal pain, and rash may develop in 3% to 20% of treated patients, but these side effects are usually mild and improve with dose reduction [7, 11, 12]. Severe side effects necessitating SSZ discontinuation occur in less than 5% of treated patients .
Our patient developed a severe systemic illness following three weeks of SSZ therapy for rheumatoid arthritis. In retrospect, her clinical presentation with rash, fever, and lymphadenopathy within 4 weeks of initiating treatment is consistent with severe SSZ toxicity . However, in this case and others, it can be difficult to distinguish a severe drug reaction from other disease processes such as infection and malignancy. In our patient's case, a concern of lymphoma was raised in light of her underlying rheumatoid arthritis as well as prominent lymphadenopathy and splenomegaly. In addition, a possible opportunistic fungal, mycobacterial, or other atypical infection was raised with the high fevers, low grade DIC, and disseminated granulomas that persisted after SSZ discontinuation. Lastly, Crohn's disease or ulcerative colitis with extraintestinal manifestations was a possibility with her severe iron deficiency anemia, diarrhea, and granulomatous enteritis. It was only after extensive evaluation that a preliminary diagnosis of SSZ drug toxicity was made. Occult inflammatory bowel disease was not definitively excluded until follow-up endoscopy was repeated 3 months later.
This patient's clinical presentation with multi-organ involvement due to an immunoallergic reaction to SSZ has not been previously reported. The gastrointestinal mucosal biopsies in this patient demonstrated multiple non-caseating granulomas with prominent eosinophilia suggestive of Crohn's disease (Figure 1). In addition, the patient's bone marrow biopsy also demonstrated multiple non-caseating granulomas and eosinophilia. Although other systemic illnesses such as untreated tuberculosis, Q fever, fungal infections, and lymphoma can lead to gastrointestinal granuloma, the acute nature of this patient's symptoms and rapid improvement with steroids make these causes unlikely. Furthermore, special stains and studies of the patient's tissues revealed no evidence of malignancy or infection. To our knowledge, only one other case of a systemic granulomatous reaction to SSZ has been reported which improved within 24 hours of SSZ discontinuation . In other cases of granulomatous drug reactions, multi-organ involvement with fevers and eosinophilia have been reported [19, 20].
Our patient had severe cholestatic hepatitis with coagulopathy. Although Still's disease can rarely lead to hepatic involvement with cholestatic hepatitis, the prior history of rheumatoid factor seropositivity and a low serum ferritin level made this diagnosis unlikely . Granulomatous hepatitis with marked elevations in serum alkaline phosphatase and granulomas on liver biopsy have been reported in patients with SSZ hepatotoxicity [22–24]. Although liver tissue was not obtained in our patient, the predominance of serum alkaline phosphatase and bilirubin level elevations and the presence of granulomas in other tissues suggest that she probably had granulomatous hepatitis. The presumed mechanism of liver injury in SSZ hepatotoxicity is an idiosyncratic hypersensitivity response. Both severe hepatitis and acute liver failure have been attributed to SSZ [25–28]. Patients with SSZ hepatotoxicity demonstrate a prompt recurrence of symptoms upon rechallenge with SSZ or sulfonamide [15, 29–31]. Susceptibility to the toxic effects of SSZ and other sulfonamides may be due to the interaction of metabolic pathways regulating N-acetylation and specific detoxification of the metabolites of the drug [32, 33]. However, it remains unclear if genetic differences in drug metabolizing enzyme expression may increase the risk of SSZ toxicity.
Myelotoxicity in this patient was manifest by leukopenia and neutropenia (Table 1). SSZ has previously been associated with neutropenia with an estimated incidence of 0.04% during the first 30 days of treatment . Bone marrow biopsy specimens of patients with SSZ induced agranulocytosis reveal a paucity of myeloid cells but full recovery typically occurs within 10 days of drug discontinuation [35–37]. Although our patient had adequate myeloid cells in her bone marrow biopsy, she developed absolute neutropenia by hospital day #19 that improved with steroid therapy. SSZ induced agranulocytosis is believed to be mediated by immunological hypersensitivity of myeloid precursors . Spontaneous recovery from SSZ agranulocytosis is frequently seen, although fatalities have been reported and some patients may benefit from granulocyte macrophage-colony stimulating factor [39, 40].
A final clinical feature of SSZ toxicity in our patient was the development of seizures. Although this patient had no known risk factors, the onset of seizures began in combination with other clinical manifestations of SSZ toxicity. Interestingly, the MRI demonstrated diffuse gray matter abnormalities. Although central nervous system vasculitis due to immune complex deposition or drug-induced lupus is a possible etiology of seizures in this patient, there was no evidence of immune complex deposition elsewhere. Another possibility is that this patient may have developed CNS granulomas. Seizures have previously been reported in patients receiving SSZ, often in the setting of other clinical manifestations of toxicity [31, 41, 42]. Although a brain biopsy would be needed to prove our hypotheses, there is a precedent for other systemic granulomatous disorders such as sarcoidosis leading to CNS granuloma formation and seizures [43, 44]. Fortunately, this patient has remained stable with no evidence of a progressive neurological disorder 7 months after presentation.
Treatment of severe adverse drug reactions is primarily supportive once a diagnosis has been established and the offending agent has been discontinued. However, in this patient's case with her prominent features of a hypersensitivity reaction and failure to improve after SSZ discontinuation, corticosteroids were administered to hasten recovery. Fortunately, most of her clinical symptoms promptly improved after steroids were begun. The use of steroids in the setting of SSZ toxicity is controversial and not always effective. In cases of fulminant hepatic failure and agranulocytosis, several patients have died despite the use of steroids [27, 28, 37]. Intravenous immunoglobulin was reported as a successful "rescue" therapy in a patient with SSZ induced fulminant hepatic failure and erythroid hypoplasia who had not responded to steroids . Due to the infrequent occurrence of severe SSZ toxicity that does not improve with drug discontinuation, it is unlikely that randomized controlled trials of steroids or other interventions will be performed. It appears reasonable to reserve steroids for patients with severe systemic SSZ toxicity that fail to respond to supportive care following drug discontinuation.
Sulfasalazine is a commonly used and effective medication in the treatment of inflammatory bowel disease and various rheumatologic disorders. Side effects usually develop within 3 months of treatment and are frequently managed with dose adjustments. However, there is a subset of patients who may develop severe and unusual systemic side effects. Although rheumatology patients may be at increased risk of SSZ toxicity compared to IBD patients, there are no reliable laboratory or clinical predictors of SSZ toxicity . Therefore, practicing physicians should be aware of the potential for severe, unexplained granulomatous reactions to SSZ that can mimic other infectious, malignant, and autoimmune conditions. Fever, rash, and eosinophilia developing within 3 months of initiating SSZ should alert the clinician to the possibility of a drug reaction. Patients with SSZ toxicity should avoid exposure to all sulfonamide containing drugs due to potential cross-reactivity. In addition, some inflammatory bowel disease patients have demonstrated cross-reactivity to 5-ASA products . If severe symptoms do not resolve with SSZ discontinuation, a short course of corticosteroids may be of benefit.
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