ABSTRACT
SESSION TITLE: Management of COVID-19-Induced Complications SESSION TYPE: Rapid Fire Case Reports PRESENTED ON: 10/19/2022 12:45 pm - 1:45 pm INTRODUCTION: Anti-neutrophil cytoplasmic antibody-associated vasculitis (ANCA-AV) is an autoimmune mediated inflammation of small and medium sized vessel walls. The occurrence of this autoimmune vasculitis is typically associated with underlying infection, medications, and genetic predisposition.(1) The objective of this case report is to describe a rare presentation of ANCA-AV in the setting of COVID-19 infection. CASE PRESENTATION: A 67-year-old male presented to the hospital with a three-week history of cough productive of brown sputum, epistaxis, fatigue, decreased appetite, and unintentional weight loss. During the previous week, he experienced worsening dyspnea and bilateral lower extremity swelling. On physical examination, he was hypoxic requiring 4L of supplemental oxygen to maintain saturations greater than 90%. Diffuse and bilateral wheezes were heard on auscultation of his lungs. A tender petechial rash was dispersed over his limbs, trunk, oropharynx, and nasopharynx. A basic metabolic panel revealed a mild, acute renal impairment. Urinalysis showed new onset proteinuria and hemoglobinuria. Nasopharyngeal swab was positive for SARS-COV-2. Contrast-enhanced computed tomography of the chest revealed diffuse, bilateral ground glass opacities and interstitial changes. Therapy with piperacillin-tazobactam was started for presumed superimposed bacterial community acquired pneumonia in the setting of COVID-19 infection. On day three of hospitalization, the petechial rash progressed to hemorrhagic blisters. His oral petechiae were now ulcerated. A punch biopsy of the affected skin showed leukocytoclastic vasculitis. Anti-Proteinase 3 (PR3) antibodies were positive. Subsequent renal biopsy showed pauci-immune focal necrotizing crescentic glomerulonephritis consistent with ANCA-AV. Therapy with intravenous pulse dose corticosteroids led to improvement in his rash and body aches, and he was discharged home on oral steroids ten days after admission. DISCUSSION: This report describes a rare case of ANCA-AV in the setting of recent COVID-19 infection. Differentiation of ANCA-AV, bacterial and COVID-19 pneumonia can be challenging on chest imaging alone.(1) New onset renal impairment, hematuria, proteinuria and the presence of the petechial rash were suspicious for co-existing ANCA-AV in this patient. COVID-19- associated cytokine storm and formation of neutrophil extracellular traps (NETs) is postulated to be the underlying cause.(1-3) NETs present myeloperoxidase (MPO) and PR3 antigens to the immune system. Formation of auto-antibodies to MPO and PR3 lead to the development of ANCA-AV. The findings of NETs on kidney biopsy specimens in patients with ANCA-AV supports this hypothesis.(1,2) CONCLUSIONS: To avoid the misdiagnosis of COVID-19-induced vasculitis, a low threshold to investigate co-existing vasculitis in patients with COVID-19 and associated clinical findings is highly recommended. Reference #1: Izci Duran T, Turkmen E, Dilek M, Sayarlioglu H, Arik N. ANCA-associated vasculitis after COVID-19. Rheumatol Int. 2021;41(8):1523-1529. Reference #2: Uppal NN, Kello N, Shah HH, et al. De Novo ANCA-Associated Vasculitis With Glomerulonephritis in COVID-19. Kidney Int Rep. 2020;5(11):2079-2083. Reference #3: Cobilinschi C, Cobilinschi C, Constantinescu A, Draniceanu I, Ionescu R. New-Onset ANCA-Associated Vasculitis in a Patient with SARS-COV2. Balkan Med J. 2021;38(5):318-320. DISCLOSURES: No relevant relationships by Andrei Hastings No relevant relationships by Jason Lane No relevant relationships by Tanya Marshall No relevant relationships by Palak Rath No relevant relationships by Sterling Shriber No relevant relationships by inderprit Singh No relevant relationships by Samuel Wiles