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Case Report | DOI: https://doi.org/10.31579/2693-7247/108
Dialysis Access Center of Pittsburgh, PA, USA
*Corresponding Author: Awad Magbri, Assistant Professor, Department of Pharmacy, University of Science & Technology Chittagong, Bangladesh.
Citation: Awad Magbri, Mariam El-Magbri, Pablo Abrego Hernandez, Marshfield Medical Center, Weston, W I. (2022) Chemical, Biological & Pharmacological Investigations of Different Fractional Extracts of Passiflora edulis Sims. (Family: Passifloraceae). J. Pharmaceutics and Pharmacology Research, 5(9); DOI:10.31579/2693-7247/108
Copyright: © 2022 Awad Magbri, This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Received: 28 October 2022 | Accepted: 01 November 2022 | Published: 08 November 2022
Keywords: pure red cell aplasia (prca); eskd (end-stage kidney disease); hemodialysis; peritoneal dialysis
We reported a case of severe anemia in a patient with end-stage kidney disease (ESKD) on dialysis. The anemia developed when the patient is switched from hemodialysis (HD) to peritoneal dialysis (PD) when the intra-venous erythropoietin stimulating agent (ESA, Epogen) was changed into subcutaneous injection of darbepoetin. The patient’s hemoglobin has dropped 2 grams in about two months during this period (table 1). Extensive work-up including, bleeding disorders, hemolysis, iron deficiency, infections including CMV, Epstein-Bar virus, parvo-19 virus infection were unrevealing (table 1). The anti-Epogen neutralizing antibodies were not measured due to unavailability. Bone marrow biopsy and aspirate were negative for infiltrations or myelodysplastic syndrome (MDS). The leukocyte and platelets counts were normal. Even though anti-ESA antibodies were not measured in this case, all tentative causes of his anemia were excluded by laboratory investigations. The patient’s anemia was treated symptomatically with blood transfusion and discontinuation of the ESA treatment. He made a remarkable recovery.
Pure red cell aplasia (PRCA) is a syndrome characterized by a normocytic normochromic anemia with severe reticulocytopenia and marked reduction in the erythroid precursors in the bone marrow. The white blood cell and the platelet counts are usually normal.
Acquired PRCA is a primary disorder or secondary to some other causes. The primary acquired PRCA is an autoimmune disorder that is antibody mediated. Many cases of acquired PRCA are idiopathic. Secondary acquired PRCA may be associated with collagen vascular/autoimmune diseases such as systemic lupus erythematosus; lymphoproliferative disorders such as chronic lymphatic leukemia or lymphoma; infections, particularly with parvovirus B19; thymoma and other solid tumors. Other toxins and drugs are sometimes implicated as a cause of PRCA, like chloramphenicol, rifampicin, phenytoin, azathioprine, and isoniazid [1]. PRCA has been described in patients treated with epoetin and other erythropoiesis stimulating agents (ESAs), stemming from the induction of neutralizing antibodies directed against the ESA molecule [2]. Most reported cases have been in patients receiving ESA for chronic kidney disease- related anemia. The aim of presenting this case is to draw attention to the possibility that rare causes of anemia in patients on dialysis must be considered and ruled out before embarking on symptomatic treatment.
Myelodysplastic syndrome can uncommonly be presented as PRCA and must be excluded by bone marrow aspirate and flow cytometry. Cyclosporin with or without corticosteroids, appears to be the single most effective immunosuppressive agent used in the treatment of PRCA.
A 63-year-old Caucasian male, with past medical history significant for hypertension, T2DM, stroke, and severe anemia. His anemia was responsive to intravenous Epogen when he was started on hemodialysis (HD). Then he developed a precipitous decrease in his hemoglobin over a period of eight weeks. His reticulocyte count was low, and his iron stores were normal. The abrupt decrease in his hemoglobin occurred when darbepoetin is switched to subcutaneous injection for his anemia treatment (table 1).
His physical examination revealed an obese man with no significant shortness of breath, alert and oriented x 3. His heart, chest and abdominal examination were unremarkable. He has mild lower extremities edema.
He was started on HD for his ESKD in May 2022 via a tunnel dialysis catheter in the right internal jugular vein. He then switched to peritoneal dialysis (PD) in June 2022. He was on Epogen intravenous injection while he was on HD. When he was switched to PD, his Epogen is replaced by Darbepoetin subcutaneously.
A CT scan of the abdomen and pelvis failed to show any retroperitoneal bleeding or lymphadenopathy. During the interim time he received blood transfusion to maintain his HgB in the normal range. His hemoglobin dropped from 10.8 to 6.5g/dl in 8-12 weeks, (table 1). Despite extensive work-up for bleeding including upper and lower endoscopy and screen for infection, no cause was found to account for his anemia (table 1). There was no evidence of hemolysis also to explain his precipitous decline in the HgB (table 1).
His bone marrow examination revealed normal WBC and platelets precursors with marked reduction of the red blood cell precursors. No evidence of bone marrow infiltration was found, pictures is not available. Although, the anti-EPO antibodies were not measured due to unavailability. Given the clinical pictures and the fact that he has developed only anemia with normal iron stores, white cell count, and platelet count, marked reduction of the reticulocyte count and with no evidence of bone marrow disease, PRCA was considered the plausible cause of his anemia. No immunosuppression was started based on the recommendation of the hematologist. The patient’s anemia was treated symptomatically with blood transfusion and discontinuation of the ESA treatment. He made a remarkable recovery.
Table 1: WBC – white blood cell count RBC – red blood cell count Hgb – hemoglobin HCT – hematocrit TIBC – total iron binding capacity Ng/ml – nanogram per milliliter
The diagnosis of PRCA rests on excluding other causes of normocytic normochromic anemia with normal white cell and platelets counts. In PRCA, the reticulocyte count and the reticulocyte index should be low with marked reduction in the red cell precursors in the bone marrow, in a patient who received ESA injections for his/her anemia.
Most cases of non-erythropoietin (EPO) related PRCA are mediated by IgG autoantibodies or cytotoxic T lymphocytes directed against erythroid precursor or progenitor cells [1,3]. PRCA against endogenous EPO is rare in patients who have never been treated with ESA [4-6].
Several preparations of ESA produced by various manufactures differ from each other by the degree of glycosylation and sialic acid content [7]. The vast majority of PRCA occurred in patients who are treated with epoetin alfa (Eprex, in single-use syringes) which are used outside the United States. EPO-related PRCA has been described with other preparations including darbepoetin alfa and methoxy polyethylene glycol-epoetin beta [8,9].
Almost all reported cases of anti-EPO antibody-mediated PRCA have occurred in patients with chronic kidney disease (CKD) who have received the drug subcutaneously (2,10-12). Reports of anti-EPO antibody mediated PRCA have occurred in patients in Canada, Australia, and Asia [11,13]. The condition remains extremely rare, given the widespread use of EPO and other ESA in treating patients with anemia of chronic disease [14,15]. The reported incidence of PRCA occurring with subcutaneous exposure of ESA is estimated to be 1.6 per 10,000 patient-years [16]. There have been over 200 reported cases of PRCA cases caused by Eprex use representing most reported PRCA cases [11,13,17]. Fortunately, EPO PRCA has become exceedingly rare after the modification of the EPO backages [18].
Development of anti-EPO non-neutralizing and neutralizing antibodies has occurred in Thailand related to subcutaneous use of product manufactured and used outside the United States [19-22]. Based on Canadian studies the routine screening for anti-EPO antibodies cannot be justified given the rarity of the conditions [23,24].
The 2012 kidney Disease: Improving Global Outcome (KDOGO) guidelines, suggest evaluation for PRCA due to anti-EPO antibodies should occur in a patient exposed to at least eight-weeks of ESA therapy who develops all the following [25]:
Elevated serum transferrin saturation and serum ferritin, reflecting decrease utilization of iron secondary to diminished erythrocytosis which can be a clue to the occurrence of PRCA.
Evaluation of PRCA consists of a bone marrow aspirate examination and assessment for the presence of anti-EPO antibodies. Bone marrow aspirate reveals severe erythroid hypoplasia, with <5>
Both neutralizing and non-neutralizing anti-EPO antibodies may be present and can cause the PRCA (31). The availability of these tests differs in different parts of the world. It is recommended if you suspected the diagnosis of PRCA to send the blood samples to the ESA-manufacture, where different test can be performed (27).
There is limited experience with managing PRCA, but the following have been used
Patients who received cyclophosphamide or cyclosporin with or without steroids have the best results. The fastest response occurred with the use of cyclosporin (28-31). Continuation of treatments with corticosteroids and immunotherapy should be accomplished until the anti-EPO antibodies become undetectable.
The treatment can be discontinued in patients who do not respond in 3-4 months after initiation of therapy. Monitoring reticulocyte count and anti-EPO antibody levels every 1-2 weeks during treatment is recommended.
Hypoxia-inducible factor prolyl hydroxylase inhibitors (HIF-PHIs) are a novel class of oral drugs that stimulate the production of endogenous EPO. These drugs can be helpful for the management of anemia in patients with EPO-associate PRCA (32-35).
Patients who develop normocytic normochromic anemia while on ESA with normal WBC, platelet count, and normal iron stores should be investigated for bone marrow failure or PRCA. PRCA is characterized by a normocytic normochromic anemia with severe reticulocytopenia and marked reduction in the erythroid precursors in the bone marrow. The white blood cell and the platelet counts are usually normal. Most cases of EPO-related PRCA are due to anti-EPO antibodies. Treatment consists of discontinuation of ESA, transfusion of RBCs as necessary for anemia, immunosuppression to eradicate the antibodies, and at times kidney transplant in patients who are transplant candidates.
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