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Case ReportImages in Rheumatology

Digital Gangrene in a Patient with Systemic Lupus Erythematosus and Systemic Sclerosis

MOHAMMED A. OMAIR, ARTHUR BOOKMAN and SHIKHA MITTOO
The Journal of Rheumatology September 2012, 39 (9) 1895-1897; DOI: https://doi.org/10.3899/jrheum.120123
MOHAMMED A. OMAIR
Division of Rheumatology, Department of Medicine, Mount Sinai Hospital, University Health Network, and University of Toronto;
MD, FRCPC
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ARTHUR BOOKMAN
MD, FRCPC
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SHIKHA MITTOO
MD, MHS, FRCPC
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  • For correspondence: Smittoo@mtsinai.on.ca
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This article has corrections. Please see:

  • Errata - November 01, 2012
  • Errata - November 01, 2012

Nearly half of patients with systemic sclerosis (SSc) experience a digital ulcer, and many of these ulcers may progress to digital gangrene. Gangrene can stem from inadequate healing of digital ulcers or complications of comorbidities along with elevated C-reactive protein (CRP) levels.

A 49-year-old woman diagnosed with systemic lupus erythematosus (SLE) and an overlap with SSc since 2006 presented in December 2010 with a 1-day history of acute pain and discoloration of all her digits (Figure 1).

Figure 1.
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Figure 1.

Dorsal and palmar views showing acute gangrene of all 5 digits on the right hand and chronic ulcers affecting the palmar aspect on the left hand (A, B). Panels (C) and (D) show both hands after 6 months of followup. Note the extensive skin desquamation on both hands.

Her connective tissue disease course was characterized by sclerodactyly, gastrointestinal reflux, inflammatory arthritis, serositis, oral ulcers, Raynaud’s phenomenon (RP), positive antinuclear antibody with titer 1:640 in a speckled pattern, rheumatoid factor, anti-Sm, and anti-RNP antibodies. She was treated since 2008 with stable doses of methotrexate and leflunomide. She was not known to have any risk factors for atherosclerosis such as diabetes mellitus, hypertension, or dyslipidemia, and she did not smoke.

Examination revealed sclerodactyly, facial telangiectasias, and scleroderma facial changes. There were no features of synovitis, malar rash, discoid lesions, oral ulcers, or pleural or pericardial rubs at this presentation. Cardiopulmonary examination was unremarkable. She had no vascular bruits and normal radial and ulnar pulses. There were no signs in the hands or fingers suggestive of vasculitis (Osler nodes, Janeway lesions, or splinter hemorrhages).

She was admitted to hospital with severe digital ischemia of hands and feet that presented abruptly and without warning over several days. There was no antecedent acceleration of her RP. Initial treatment was started with intravenous prostaglandin and oral daily prednisone 40 mg as her physicians investigated the cause of her presentation. She continued leflunomide 20 mg daily along with oral methotrexate 15 mg weekly.

A complete blood count revealed normocytic anemia of 87 gm/l but normal white cell and platelet count. Liver function tests, serum creatinine, and urinalysis were unremarkable. She had an erythrocyte sedimentation rate of 75 mm/h and negative antiphospholipid antibodies and negative screening for hypercoagulation as well as cryoglobulin; serum complement C3 and C4 levels were within normal limits. An angiogram of the upper extremities did not reveal a structural etiology for her digital ischemia. An echocardiogram indicated no source for embolization. Despite therapeutic efforts, she progressed to dry gangrene in all digits in her right hand, and chronic digital volar ulcers at her fingertips in the left hand.

She had an improvement in her pain and transitioned to oral vasodilator therapy with irbesartan and a nitroglycerin patch at the time of her discharge. Over the next 6 months, prednisone was tapered to 10 mg. Her pain continued to diminish, and there were no new digital events as her gangrene progressed to clear demarcation.

Overlap of SSc and SLE is well described in the literature1. Sometimes this occurs within the context of mixed connective tissue disease (MCTD), as may be the case here. RP is a manifestation of all these conditions, occurring in 40% of patients with SLE, 96% of patients with SSc2, and 99% of patients with MCTD3. The RNP and Sm antigens are both contained within the spliceosome complex, and sera reactive with 1 antigen frequently have additional serologic reactivity with the other. Anti-RNP has been observed in patients with SLE because of the cross-reactivity between the 2 conditions; the presence of anti-Sm has been excluded in the Sharp criteria for MCTD. This patient’s disease is best characterized as an overlap syndrome. Our rationale for labeling her condition as SSc/SLE overlap is explained by the presence of oral ulcers and the anti-Sm positivity3,4,5,6,7.

Nearly half of patients with SSc experience a digital ulcer during their disease course and 30% of these ulcers may progress to some degree of digital gangrene. The incidence of digital gangrene increases with greater duration of digital ulcers, suggesting that inadequate healing heralds further adverse digital sequelae and warrants aggressive treatment and monitoring8. On the other hand, digital gangrene can also be a complication of longstanding SLE with RP and elevated levels of CRP9.

Interestingly, this case presented in a very dramatic and unexpected fashion, without concurrent acceleration of RP. Such digital gangrene has been reported in SSc as well as in SLE in conjunction with vasculitis or antiphospholipid antibody syndrome. Digital ulcers are frequent and often appear at the initial presentation in patients with MCTD. Digital gangrene appears to be a rare occurrence in MCTD.

Our case represents a digital sequela from SSc-related endothelial dysfunction, as there were no signs of active SLE or vasculitis. Angiographic and pathologic studies of SSc-associated RP further indicate that the vascular disease is characterized by progressive obliteration of affected arteries with defective angiogenesis and vasculogenesis, resulting in inadequate collateral circulation10. Endothelial dysfunction, vascular smooth muscle cell activation, and intimal hyperplasia are hallmark features of SSc vasculopathy10.

It is critical for clinicians to have heightened awareness of the distinction between digital necrosis stemming from SLE in contrast to that seen with SSc, because management differs. SLE-related digital ischemia often necessitates the prompt initiation of corticosteroids, whereas SSc-related digital ischemia requires aggressive vasodilator therapy9. There may be a role for anticoagulation in some cases. Acute gangrene that fails to respond to potent vasodilators has a wide differential diagnosis of potential causes. Autoimmune disease may underlie many of these cases through a variety of mechanisms. Correct diagnosis of the autoimmune condition, along with accurate identification of the scleroderma spectrum of disorder (including MCTD) is helpful in guiding the management of digital ischemia.

REFERENCES

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    1. Pope JE
    . Scleroderma overlap syndromes. Curr Opin Rheumatol 2002;14:704–10.
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    Clinical risk assessment of organ manifestations in systemic sclerosis: A report from the EULAR Scleroderma Trials and Research group database. Ann Rheum Dis 2007;66:754–63.
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    . The structure of mammalian small nuclear ribonucleoproteins. Identification of multiple protein components reactive with anti-(U1)ribonucleoprotein and anti-Sm autoantibodies. J Biol Chem 1984;259:5907–14.
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    The use of immunoblotting and immunoprecipitation of (U) small nuclear ribonucleoproteins in the analysis of sera of patients with mixed connective tissue disease and systemic lupus erythematosus. A cross-sectional, longitudinal study. Arthritis Rheum 1986;29:986–96.
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    7. et al.
    Clinical and immunologic manifestations of mixed connective tissue disease in a Miami population compared to a Midwestern US Caucasian population. J Rheumatol 2008;35:429–37.
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    1. Kasukawa R,
    2. Sharp GC
    . Mixed connective tissue disease and anti-nuclear antibodies: Proceedings of the International Symposium on Mixed Connective Tissue Disease and Anti-nuclear Antibodies, Tokyo, 29–30 August 1986. Amsterdam, New York: Excerpta Medica; 1987.
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    1. Steen V,
    2. Denton CP,
    3. Pope JE,
    4. Matucci-Cerinic M
    . Digital ulcers: Overt vascular disease in systemic sclerosis. Rheumatology 2009;48 Suppl 3:iii19–24.
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    1. Liu A,
    2. Zhang W,
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    . Prevalence, risk factors and outcome of digital gangrene in 2684 lupus patients. Lupus 2009;18:1112–8.
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    1. Wigley FM
    . Vascular disease in scleroderma. Clin Rev Allergy Immunol 2009;36:150–75.
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Digital Gangrene in a Patient with Systemic Lupus Erythematosus and Systemic Sclerosis
MOHAMMED A. OMAIR, ARTHUR BOOKMAN, SHIKHA MITTOO
The Journal of Rheumatology Sep 2012, 39 (9) 1895-1897; DOI: 10.3899/jrheum.120123

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Digital Gangrene in a Patient with Systemic Lupus Erythematosus and Systemic Sclerosis
MOHAMMED A. OMAIR, ARTHUR BOOKMAN, SHIKHA MITTOO
The Journal of Rheumatology Sep 2012, 39 (9) 1895-1897; DOI: 10.3899/jrheum.120123
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