If patients have active virus infections that are associated with HLH such as EBV, CMV, adenovirus, influenza, etc., treatments targeting those infections should be initiated including rituximab for EBV, and anti-viral agents such ganciclovir, cidofovir, oseltamivir, and others as appropriate.
What is EBV associated HLH?
EBV-HLH is a clinicopathological syndrome encompassing a dramatically dysregulated immune response and hypercytokinemia, characterized clinically by fever, splenomegaly, and cytopenia accompanied by histological evidence of hemophagocytosis, resulting in extremely high serum levels of ferritin, lactate dehydrogenase.
Can Mono cause high ferritin levels?
Also, increased levels of serum ferritin were found in CMV- infected individuals and patients with acute mononucleosis [26–29]. In this study, high levels of serum ferritin were associated with EBV infection and EBV/CMV coinfection.
How does EBV cause HLH?
Precise mechanism of EBV-induced HLH has recently been found. It means that EBV-infected B cells stimulate cytotoxic T lymphocytes leading to hypercytokinemia and stimulation of histolytic cells. More recently, it has been found that chronic stimulation by EBV may cause chronic HLH in the patient.
What is hemophagocytic syndrome?
Hemophagocytic lymphohistiocytosis (HLH) is an aggressive and life-threatening syndrome of excessive immune activation. It most frequently affects infants from birth to 18 months of age, but the disease is also observed in children and adults of all ages.
What is secondary HLH?
Secondary HLH is an acquired form of the disease that is triggered by an infection, malignancy, auto-immune disease or other immune challenge. It does not require that patients undergo stem cell transplantation.
What causes elevated ferritin levels?
The most common causes of elevated ferritin levels are obesity, inflammation, and daily alcohol intake. The most common causes of genetic-related elevated ferritin levels is the condition hemochromatosis.
Does hemolysis increase ferritin?
Hemolysis of test samples up to a hemoglobin concentration of 3 g/l in the serum did not significantly change the ferritin concentration. This means that hemolysis of test samples is usually no problem in clinical practice.
How is hemophagocytic syndrome diagnosed?
HLH can be diagnosed only with the proper tests. Blood tests include blood cell counts, liver function, infection studies, and markers of immune system activation such as ferritin and soluble IL-2 receptor levels. A bone marrow aspirate and biopsy may be performed to look for microscopic evidence of hemophagocytosis.
Is hemophagocytic lymphohistiocytosis curable?
Stem cell transplant can cure HLH in most cases. There is no way to prevent HLH, but as healthcare providers continue to learn more about it, treatment improves. Most children who are successfully treated go on to live normal lives.
Why is ferritin high in HLH?
HLH is a rare cause of extreme hyperferritinemia; other causes such as liver disease, malignancies, and iron overload conditions are more commonly implicated in increasing serum ferritin to extreme levels.
What causes hemophagocytic lymphohistiocytosis?
Conditions that can lead to secondary hemophagocytic lymphohistiocytosis include viral infections especially Epstein-Barr virus, other infections including bacterial, viral and fungal infections, a weakened or depressed immune system, autoimmune diseases, autoinflammatory diseases, rheumatological diseases such as …
What is the difference between EBV and secondary hypogammaglobulinemia?
EBV may also be accompanied by hypogammaglobulinemia for a certain period. Secondary HLH is associated with immunologic stimulation caused by malignancies and bacterial or congenital infections. The most common causes of secondary HLH are viral infections by EBV, CMV, ProB19 and HIV.
What is the prognosis of hemophagocytic lymphocytosis (HLH)?
HLH is a rare complication of Epstein-Barr virus (EBV) infection. Deficiencies may be characterized by abnormal activity of lymphocyte function leading to hemophagocytosis and multi-organ failure. Although EBV-associated HLH carries a high mortality rate, quick diagnosis and appropriate treatment can subside the disease.
What causes secondary hemolytic-uremic syndrome (HLH)?
Secondary HLH is associated with immunologic stimulation caused by malignancies and bacterial or congenital infections. The most common causes of secondary HLH are viral infections by EBV, CMV, ProB19 and HIV. EBV-related secondary HLH may occur at any age.
Why was rituximab discontinued in patients with EBV?
EBV PCR was immediately checked and rituximab therapy was discontinued. Serum Immunoglobulin levels were low during the treatment process. The patient was investigated for mutations in IL-2-inducible T cell kinase (ITK) and negative test results were received.
