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vol. 13
Letter to the Editor

Henoch-Schönlein purpura in a pediatric patient with lupus

Peng Hu
Bao Yu Huang
Dong Dong Zhang
Guang Mei Jiang
Si Yan Liu
Xun Xia
Jie Cai

Arch Med Sci 2017; 13, 3: 689–690
Online publish date: 2017/04/20
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Systemic lupus erythematosus (SLE) is a chronic autoimmune connective tissue disease (CTD). It can involve multiple systems and lead to significant mortality. Of all cases, 10% to 20% occur in the first two decades of life, with an incidence of 0.3–0.9 per 100,000 children-years and a prevalence of 3.3–8.8 per 100,000 children [1]. Children suffering from SLE have a more aggressive clinical course when compared with their adult counterparts [2]. In addition, it has been reported that approximately 6% to 12% juvenile-onset SLE patients may develop other concomitant CTDs within a few months, such as juvenile idiopathic arthritis, dermatomyositis, polymyositis, scleroderma and Crohn’s disease [3]. In the present report, we encountered a pediatric patient who suffered from Henoch-Schönlein purpura (HSP) at 3 months after diagnosis of SLE.
A 9-year-old girl was first referred to our department in October 2014 for fever, facial butterfly erythema and polyarthralgia. The subsequent autoimmune and serologic workup came back positive for antinuclear antibody (ANA) at a titer of 1 : 3200, positive anti-double-stranded DNA (anti-dsDNA), anti-Smith antibody (anti-SM), and low complements C3 (0.21 g/l) and C4 (0.01 g/l). Her initial blood counts were as follows: white blood cells 2.54 × 109/l, red blood cells 3.27 × 1012/l, hemoglobin 87 g/l, and platelets 112 × 109/l. Other blood chemistry findings were erythrocyte sedimentation rate (ESR) 34 mm/h, C-reactive protein (CRP) 12 mg/l, and serum ferritin 559.90 µg/l. Urine analysis and renal function were normal. Based on the above clinical and laboratory findings, she was diagnosed with active SLE and treated with a course of pulse methylprednisolone 15 mg/kg/day for 3 days and subsequently converted to high-dose oral prednisone (2 mg/kg/day). After 7 days of hospitalization, the fever, facial butterfly erythema and polyarthralgia gradually resolved. Three months later, the patient presented to our department again with complaints of intermittent abdominal pain, hemafecia, and purpuric rash on her lower limbs (Figure 1). Laboratory analyses revealed leucocytosis (19.18 × 109/l), thrombocytosis (399 × 109/l) and an increased plasma level of immunoglobulin A (IgA, 4.24 g/l). The former high-titer ANA, positive anti-dsDNA and anti-SM, and hypocomplementemia were still existent. On these grounds, our patient was diagnosed as having SLE coexisting with HSP. After receiving the second course of pulse methylprednisolone therapy, her complaints regressed.
The HSP is an IgA-mediated autoimmune vasculitis, characterized by non-thrombocytopenic purpura, abdominal pain, arthritis and renal involvement. As there is no definitive test for the diagnosis of HSP, the 1990 American College of Rheumatology criteria for HSP are still the most commonly used criteria for diagnosis [4]. In this report, our patient fulfilled three criteria (non-thrombocytopenic purpura, young age and bowel angina); thus a definite diagnosis of HSP can be made. The etiology of HSP remains unclear, and a number of potential triggers including infective agents, vaccines, drugs and insect bites have been proposed [5]. However, to date, few reports mention that HSP can be secondary to or coexisting with SLE. In 2011, Al-Attrach et al. first reported a 12-year-old girl who presented with features of HSP and was later diagnosed to have SLE [6].
In this report, we have presented an unusual child who suffered from HSP at 3 months after diagnosis of SLE. For our patient, the above two diseases shared several commonalities as well as dissimilarities. First, both SLE and HSP can cause multi-system involvement. In this case, SLE affected the skin, joints and blood, whereas HSP harmed the skin and gastrointestinal tract. Second, a characteristic rash is the hallmark of SLE and HSP. The rash of SLE is generally described as facial butterfly erythema, which often extends over the nasal bridge, affects the chin and ears, but spares the nasolabial folds [1]. The typical rash of HSP is palpable purpura and often symmetrically distributes over the extensor surfaces of the lower limbs and buttocks [4]. Third, the hemogram is usually abnormal in SLE and HSP. Leukopenia, anemia and thrombopenia are common in SLE; in contrast, the majority of patients with HSP exhibit leucocytosis and thrombocytosis [7]. However, it is worth noting that corticosteroid therapy may contribute to the elevated white blood cell and platelet count in our patients. Last, but most important, there is some evidence of associated autoimmune disorder in patients with SLE or HSP. According to the study conducted by Swart and Wulffraat, ANA and anti-dsDNA were positive in 20% and 98% patients with mixed CTD, respectively [3]. Furthermore, IgA-containing immune complexes were found in the sera of 67% of patients with HSP and 70% of patients with SLE [8].
To date, corticosteroids administered alone or combined with cytotoxic agents remain the first-line treatment for suppressing ongoing systemic inflammation in both SLE and HSP [5, 9]. In this report, the clinical outcome of our patient was satisfactory; her complaints regressed after two courses of pulse methylprednisolone therapy with an interval of 3 months. Fortunately, renal injury and dysfunction of other organs did not occur. Juvenile-onset SLE follows a more severe disease course than adult-onset SLE, and more than 90% of patients will develop nephritis within the first 2 years after diagnosis [1]. Although HSP is usually considered as a benign disease, still 20–35% of patients progress to chronic kidney disease [10]. Therefore, the urinary analysis and renal function of our patient should be more closely monitored.

Conflict of interest

The authors declare no conflict of interest.


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