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Inicio Endocrinología y Nutrición (English Edition) Lupus, graves’ disease, and vasculitis. A case report
Journal Information
Vol. 59. Issue 3.
Pages 222-224 (March 2012)
Vol. 59. Issue 3.
Pages 222-224 (March 2012)
Scientific letter
DOI: 10.1016/j.endoen.2011.09.008
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Lupus, graves’ disease, and vasculitis. A case report
Lupus, enfermedad de graves y vasculitis. A propósito de un caso
Miguel Pinto Valdiviaa,b
a Servicio de Endocrinología, Hospital Nacional Cayetano Heredia, Lima, Peru
b Facultad de Medicina Alberto Hurtado, Universidad Peruana Cayetano Heredia, Lima, Peru
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Autoimmune thyroid disease (AITD), characterized by the presence of antibodies against thyroid antigens, is associated with a number of non-organ-specific rheumatological disorders such as systemic lupus erythematosus (SLE), rheumatoid arthritis, and Sjögren's syndrome.1,2 For example, while the prevalence of subclinical hypothyroidism (SCH, normal T4 with elevated TSH) is 4.3% in the general population,3 it is increased to 11–13% in patients with SLE.4,5 Similarly, the prevalence of anti-thyroid peroxidase antibodies (anti-TPO) is 10–12% in the general population,3,6 but 17–23% in SLE patients.4,5 Clinical or subclinical hypothyroidism is usually common in patients with SLE and accounts for more than 87.5% of thyroid function changes in these patients.5,7 As regards Graves’ disease (GD), it is less common in both the general population (0.5%)3 and patients with SLE (1.7%).1

Antithyroid drugs are associated with adverse events, and most of them are mild and uncommon (less than 5%), but, in some cases, they may cause severe autoimmune disorders such as vasculitis, polyarthritis, or drug-induced lupus.8 Vasculitis associated with antithyroid drugs usually consists of a combination of polyarthralgia and skin lesions. However, it may affect other organs such as kidney, lung, gastrointestinal tract, or brain.9 We report the case of a female patient recently diagnosed with SLE and renal impairment who showed GD and worsening of lupus nephritis due to vasculitis associated with the use of dipyrone after being symptom-free for three years.

A 24-year-old female patient with an unremarkable clinical history was admitted to hospital for the recent onset of a nephrotic syndrome (24-h proteinuria, 8.75g/day) and moderate renal failure (glomerular filtration rate, 80mL/min). The result of a renal biopsy was consistent with class V lupus nephritis (diffuse membranous glomerulonephritis). Positive ANA and anti-DNA tests completed the diagnostic criteria. Treatment was therefore started with prednisone 60mg/day and bimonthly intravenous cyclophosphamide pulses. The clinical course was characterized by the remission of proteinuria, asymptomatic SLE, and the occurrence of iatrogenic Cushing syndrome.

Three years later, the patient reported fine hand tremor, heat intolerance, palpitations, and weight decrease. Physical examination showed exophthalmos, diffuse goiter (60g), and hyperreflexia. Laboratory test results included TSH 0.042μIU/dL (normal, 0.3–5), free T4 6.85ng/dL (normal, 0.8–2), and total T3 415ng/dL (normal, 86–190). Anti-TPO antibodies were positive, and iodine uptake was 60% at 24h (normal, 15–35). Anti-TSH receptor antibodies were not measured. These results confirmed the diagnosis of GD, and treatment was started with dipyrone 20mg/day and propranolol 40mg three times daily. After one week of treatment, the patient experienced malaise, fatigue, joint pain, and generalized edema. A repeat 24-h urine protein test showed a value in the nephrotic range. In our department, it was assumed that renal impairment was secondary to vasculitis induced by antithyroid drugs, and dipyrone was therefore discontinued. No repeat renal biopsy or measurement of antineutrophil cytoplasmic antibodies (ANCA) was performed. The disease activity index for SLE (SLEDAI) was consistent with moderate disease. However, serum complement levels and platelet and WBC counts were normal. The patient continued to receive propranolol and prednisone. After one week, she was administered 12 mCi of 131I. The clinical course was favorable. Massive proteinuria disappeared, SLE remained asymptomatic, and the patient developed hypothyroidism, which was treated with levothyroxine 50μg daily.

Up to 25% of patients with SLE may have thyroid dysfunction, which most commonly occurs as SCH and the presence of anti-thyroid antibodies.4 Anti-thyroid antibodies may even appear before thyroid dysfunction in 70% of SLE patients.5 On the other hand, 30% of patients with AITD have an associated systemic autoimmune disease, particularly patients with Hashimoto's thyroiditis.10 Rheumatoid arthritis is the most commonly associated autoimmune disease.11

This event may be related to polyautoimmunity, a condition in which autoimmune diseases with different phenotypes occur in the same person or familial groups. These diseases may share common pathophysiological mechanisms such as genetic factors, cross-reactivity between their autoantibodies, T cells autoreactive to different autoantigens, or similar variations in their cytokine patterns.12,13

Systemic autoimmune diseases could also accelerate the occurrence of anti-thyroid antibodies in susceptible subjects. The prevalence of anti-TPO in the general population over 18 years of age is approximately 10%, but may be increased to 30% in women older than 70 years.4 Thus, the progression of the thyroid autoimmune process (the presence of autoantibodies, SCH, hypothyroidism) could be accelerated.

GD, as a variant of AITD, is less common, but these patients may spontaneously evolve to hypothyroidism. In addition, autoantibodies, which stimulate and block the TSH receptor coexist in AITD, and patients may fluctuate between hyperthyroidism and hypothyroidism.

Thionamides are the mainstay in the treatment of hyperthyroidism, especially in young women with GD.8 In rare cases, thionamides may induce small vessel vasculitis. Vasculitis is more commonly associated with propylthiouracil (not available in Spain) than with dipyrone and is not dose-dependent.9 This condition is usually characterized by renal impairment, arthritis, skin ulcers, and respiratory symptoms. Thionamides have been shown to accumulate in neutrophils, where they induce the production of toxic substances which finally act as immunogens.8

In our patient, the administration of dipyrone triggered a generalized inflammatory process characterized by proteinuria and SLE exacerbation. The discontinuation of the triggering agent and the use of glucocorticoids resulted in a significant improvement.

In conclusion, frequent evaluation of the thyroid profile and the presence of anti-thyroid antibodies is recommended in patients with SLE.

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Please cite this article as: Pinto Valdivia M. Lupus, enfermedad de graves y vasculitis. A propósito de un caso. Endocrinol Nutr. 2012;59(3):215–24.

Copyright © 2011. SEEN
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