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Case ReportCASE REPORTS AND CLINICAL OBSERVATIONS
Open Access

Hydralazine-Induced Isolated Lupus Nephritis

Naseer Khan, Ronald Reichel, Ayesha Khurshid, Katie Tso, Joan Broussard and Amrika Dass
Ochsner Journal June 2020, 20 (2) 187-192; DOI: https://doi.org/10.31486/toj.18.0128
Naseer Khan
1Department of Nephrology, Ochsner Clinic Foundation, Baton Rouge, LA
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  • For correspondence: naskhan@ochsner.org
Ronald Reichel
1Department of Nephrology, Ochsner Clinic Foundation, Baton Rouge, LA
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Ayesha Khurshid
2The Institute for Evidence-Based Reform, Baton Rouge, LA
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Katie Tso
3Louisiana State University, Baton Rouge, LA
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Joan Broussard
4Department of Pharmacy, Ochsner Clinic Foundation, Baton Rouge, LA
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Amrika Dass
5Clinic Operations, Ochsner Clinic Foundation, Baton Rouge, LA
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Abstract

Background: Hydralazine has been known to cause multiple side effects, both localized and systemic. The literature includes case reports of systemic vasculitis caused by hydralazine.

Case Report: A 79-year-old male with stage 3 chronic kidney disease attributable to hypertension and type 2 diabetes was started on hydralazine to control his hypertension. Three weeks after starting hydralazine, the patient developed nephrotic syndrome and acute kidney injury with progressively worsening proteinuria. Pathologic evaluation of the kidney tissue revealed that the patient had lupus nephritis. Immunologic markers confirmed hydralazine-induced lupus nephritis with positive antihistone antibodies. No evidence of systemic vasculitis was found. The patient's hydralazine was stopped, and the patient was treated with immunosuppressive therapy. After 7 months of immunosuppressive therapy, the patient achieved complete remission of lupus nephritis.

Conclusion: Isolated renal disease induced by hydralazine as part of drug-induced lupus is uncommon. Our patient developed isolated classic lupus nephritis after hydralazine therapy with no associated systemic vasculitis. Treatment required stopping the hydralazine and initiating systemic immunosuppressive therapy to achieve complete remission.

Keywords:
  • Acute kidney injury
  • hydralazine
  • lupus nephritis
  • nephrotic syndrome
  • proteinuria

INTRODUCTION

Drug-induced lupus erythematosus is a lupus-like syndrome induced by an offending agent or drug. This phenomenon was first described in 1945 in association with sulfadiazine.1 Multiple drugs have since been identified to cause drug-induced lupus erythematosus. The drugs most commonly implicated are hydralazine, procainamide, quinidine, isoniazid, diltiazem, minocycline, and tumor necrosis factor-alpha blocking agents.2

Hydralazine has been linked to drug-induced lupus erythematosus since the early 1950s.2-5 Although rare, most of the systemic syndromes attributed to hydralazine therapy involve multiorgan dysfunction.6 Yokogawa and Vivino reviewed 68 cases of systemic vasculitis and lupus-like syndrome attributed to hydralazine and found that the majority of drug-induced lupus erythematosus cases involved systemic vasculitis with a rare renal component (13%).2 In the first case series published in 1984, which is the largest to date, 6 cases of drug-induced lupus nephritis were reported.6 The majority of the cases involved multiple organ systems with vasculitis and manifestations of pancytopenia, hypocomplementemia, and pulmonary renal syndrome. Overlapping syndromes are present in the majority of renal involvement cases.7,8 The Hogan et al review of drug-induced glomerular disease reiterated that hydralazine-induced lupus nephritis is rare.9

We present the case of a patient with hydralazine-induced lupus nephritis that resulted in a rapid decline in renal function.

CASE REPORT

In November 2016, a 79-year-old Caucasian male presented to the nephrology clinic for evaluation of nephrotic syndrome and acute kidney injury with worsening proteinuria and hematuria. The patient's medical history included long-standing essential hypertension, diet-controlled type 2 diabetes, and stage 3 chronic kidney disease for at least 10 years, with stable serum creatinine levels ranging from 1.3 to 1.7 mg/dL. He had no history of proteinuria. Three weeks prior to this visit, the patient's cardiologist initiated hydralazine therapy for management of hypertension. Rheumatology workup for degenerative joint disease in 2015 revealed positive antinuclear antibodies with a ratio of 1:160 without specific antibodies for systemic lupus erythematosus. At that point, rheumatology found no clinical evidence of connective tissue disease.

The patient had had a rheumatologic workup in the past because of symptoms unrelated to his presentation in November 2016 (Table 1). At the patient's presentation in November 2016, urologic workup for hematuria was done (Table 2), and computed tomography urogram showed no blockages or stones. The workup showed nephrotic-range proteinuria and hematuria, along with a sharp rise in serum creatinine, up from a baseline of 1.5 mg/dL (in June 2016) to 1.9 mg/dL (in October 2016) to 2.6 mg/dL (in November 2016). Proteinuria was 5.24 g/24 hours. The patient exhibited features of drug-induced lupus nephritis with positive antihistone antibody and highly positive anti-dsDNA antibody at 1:2560. Complement levels remained within normal limits. Both cytoplasmic antineutrophil cytoplasmic antibody (ANCA) and perinuclear ANCA were negative. Anti–glomerular basement membrane antibodies were negative. Screening with serum protein electrophoresis, cryoglobulins, and anti–smooth muscle antibody tests was negative.

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Table 1.

Patient's Baseline Immunochemistry, 2010-2015

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Table 2.

Patient's Immunochemistry at Presentation and Posttreatment, 2016-2017

The patient was advised to discontinue hydralazine; however, his renal function did not improve upon drug discontinuation. His serum creatinine peaked at 5.2 mg/dL with a glomerular filtration rate <10 mL/min. Diagnostic kidney biopsy revealed diffuse proliferative glomerulonephritis (Figures 1 and 2). Immunofluorescence was consistent, with multiple immune deposits as seen in lupus nephritis (Figure 3). Based on these findings, the patient was diagnosed with hydralazine-induced lupus nephritis.

Figure 1.
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Figure 1.

Light microscopy shows diffuse proliferative glomerulonephritis (magnification ×40).

Figure 2.
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Figure 2.

Electron microscopy shows immunologic damage to kidney with antibody deposits: thickened glomerular basement membrane; occasional subendothelial, rare subepithelial and scattered mesangial deposits; and rare reticular aggregates (magnification ×2800).

Figure 3.
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Figure 3.

Demonstration of (A) immunoglobulin (Ig) G, (B) IgA, (C) complement component 1q (C1q), and (D) complement 3 component (C3) antibodies on immunofluorescence is consistent with the clinical picture of lupus nephritis. Images show codominant IgG and IgA (1-2+) diffuse segmental to global mesangial and capillary loop staining in a full house pattern and diffuse granular basement membrane staining for IgG, IgA, C1q, and C3.

Because renal function did not improve upon discontinuation of hydralazine, the patient was started on combination immunosuppressive therapy that consisted of a daily dose of intravenous methylprednisolone (Solu-Medrol) 1,000 mg daily for 3 days and then continued on oral mycophenolate mofetil 500 mg twice daily and oral prednisone 60 mg daily for the first month (November 2016). His dosage of oral mycophenolate mofetil was increased to 1,000 mg twice daily the following month. Beginning in January 2017, prednisone was tapered to 10 mg daily. In February, mycophenolate mofetil therapy was discontinued, at which time the patient developed pneumonia and shingles. The patient continued on a tapered dose of prednisone for 3 months, after which he was continued on prednisone 10 mg for an additional 4 months (Table 3).

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Table 3.

Prescribed Medications With Doses

The patient responded to combination therapy with steroids and mycophenolate mofetil. His renal function progressively improved, and his dsDNA antibody levels decreased. The patient achieved complete remission of lupus nephritis with resolution of proteinuria, and his kidney function returned to baseline after 3 months. After 7 months of immunosuppressive therapy, all immunologic markers returned to the patient's baseline levels (Table 2).

In this case, the only clinical manifestation of drug-induced lupus erythematosus was lupus nephritis that caused a decline in kidney function and nephrotic-range proteinuria. Treatment required aggressive immunosuppressive therapy and the cessation of hydralazine.

DISCUSSION

Hydralazine is a commonly prescribed hypertensive agent that has a wide variety of clinical uses, from treatment of essential hypertension to treatment for congestive heart failure. Hydralazine can be prescribed alone or in combination with other medications. Systemic side effects of hydralazine are rare. Some of the adverse effects related to hydralazine include reflex tachycardia, hemolytic anemia, vasculitis, glomerulonephritis, and lupus-like syndrome.10,11 Although our patient had a history of hypertension and type 2 diabetes, he had stable kidney function with no heavy proteinuria for many years prior to the introduction of hydralazine. At the time of the patient's presentation, the differential diagnosis included diabetic nephropathy, hypertensive nephropathy, and drug-induced glomerulonephritis. Patients with type 2 diabetes and hypertension can develop nephrotic-range proteinuria due to diabetic nephropathy and hypertensive nephropathy. Although our patient had both hypertension and type 2 diabetes, we suspected the possibility of glomerulonephritis given the rapid onset of nephrotic-range proteinuria and the rapid decline of kidney function. Further investigation with immunologic markers revealed the presence of antihistone antibodies that fulfilled the criteria for drug-induced lupus erythematosus. Both clinically and on immunologic workup, the only manifestation of systemic lupus erythematosus was glomerulonephritis. Biopsy confirmed lupus nephritis.

Our case fulfilled the clinical and immunologic criteria for lupus nephritis (ie, hydralazine-induced systemic lupus erythematosus confined to the kidney). The final diagnosis of lupus nephritis without evidence of systemic vasculitis is in sharp contrast to what was described in the literature with cases that involved overlapping vasculitic diseases. Some cases of systemic lupus erythematosus were not confined to renal involvement only; some cases had multiorgan involvement, including lung and skin.6

The collaborative treatment team included cardiology, nephrology, and rheumatology. Because of the patient's advanced age and multiple comorbidities, we chose mycophenolate mofetil for immunosuppression instead of cyclophosphamide in addition to the steroids typically used to treat lupus nephritis. The patient achieved complete remission of lupus nephritis after 7 months of combination immunosuppressant therapy.

Multiple drugs, including hydralazine, have been implicated in inducing an autoimmune response, resulting in drug-induced glomerulonephritis.9 Most of these drug-induced glomerulonephritis cases involved systemic vasculitis syndrome. ANCA testing is used to diagnose types of autoimmune vasculitis.12 The patients described in the 1984 study were not screened for ANCA; consequently, they could have had overlapping syndromes that were not diagnosable at the time because of limitations in available testing.6 In our case, we were able to successfully exclude ANCA-associated vasculitis.

Positive antihistone antibody and ANA HEp-2 titer are typically seen in hydralazine-induced lupus.

Based on the available literature, risk factors for hydralazine-induced lupus include old age, being Caucasian, slow acetylator phenotype, and human leukocyte antigen – DR isotype (HLA-DR4) genotype.2,5 We accept the limitation of our workup for hydralazine-induced lupus nephritis, as we did not have slow acetylator or HLA-DR4 status for our patient.

CONCLUSION

Reports of hydralazine-induced isolated lupus nephritis without evidence of any other systemic vasculitis are rare in the literature. Our case of isolated classic lupus nephritis with no associated systemic vasculitis induced by hydralazine required the cessation of hydralazine and systemic immunosuppressive therapy. Strong clinical suspicion, prompt immunologic evaluation, and diagnostic renal pathology were key to proper management and successful treatment.

This article meets the Accreditation Council for Graduate Medical Education and the American Board of Medical Specialties Maintenance of Certification competencies for Patient Care and Medical Knowledge.

ACKNOWLEDGMENTS

The authors thank Dr Agnes Fogo and Dr Mark Lusco of the Division of Renal Pathology at Vanderbilt University Medical Center, Nashville, TN, for providing the renal biopsy image legends. The authors have no financial or proprietary interest in the subject matter of this article.

  • ©2020 by the author(s); Creative Commons Attribution License (CC BY)

©2020 by the author(s); licensee Ochsner Journal, Ochsner Clinic Foundation, New Orleans, LA. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (creativecommons.org/licenses/by/4.0/legalcode) that permits unrestricted use, distribution, and reproduction in any medium, provided the original author(s) and source are credited.

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Hydralazine-Induced Isolated Lupus Nephritis
Naseer Khan, Ronald Reichel, Ayesha Khurshid, Katie Tso, Joan Broussard, Amrika Dass
Ochsner Journal Jun 2020, 20 (2) 187-192; DOI: 10.31486/toj.18.0128

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Hydralazine-Induced Isolated Lupus Nephritis
Naseer Khan, Ronald Reichel, Ayesha Khurshid, Katie Tso, Joan Broussard, Amrika Dass
Ochsner Journal Jun 2020, 20 (2) 187-192; DOI: 10.31486/toj.18.0128
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Keywords

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