Dysregulated expression of miRNAs in immune thrombocytopenia

In recent years the critical role of miRNAs has been established in many diseases, including autoimmune disorders. Immune thrombocytopenia purpura (ITP) is a predominant autoimmune disease, in which aberrant expression of miRNAs has been observed, suggesting that miRNAs are involved in its development. miRNAs could induce an imbalance in the T helper (Th)1/Th2 cell and Th17/Treg cell-related responses. Moreover, they could also cause alterations in Th9 and Th22 cell responses, and activate Tfh (T follicular helper) cell-dependent auto-reactive B cells, thus influencing megakaryogenesis. Herein, we summarize the role of immune-related miRNAs in ITP pathogenesis, and look forward to clinical applications.

Endocarditis Caused by Candida parapsilosis Presenting With Severe Thrombocytopenia in a Patient With Tetralogy of Fallot

Infective endocarditis (IE) occurs more frequently in individuals living with congenital heart disease, often with high morbidity and mortality. Although gram-positive bacterial infections commonly cause IE, prosthetic valves are a known risk factor for fungal IE. We report a case of prosthetic pulmonary valve Candida parapsilosis IE in a 58-year-old male with repaired tetralogy of Fallot. He presented with fatigue, petechiae, and hematochezia. He had severe thrombocytopenia from idiopathic/immune thrombocytopenia purpura, which resolved with steroids and immunoglobulin. Treatment with antifungals as well as a surgical pulmonary valve replacement resulted in recovery without relapse at greater than a year.

Update on Thrombocytopenia in Pregnancy

Thrombocytopenia, defined as platelet count < 150,000 mm3, is frequently diagnosed by obstetricians since this parameter is included in routine surveillance during pregnancy, with an incidence of between 7 and 12%. Therefore, decisions regarding subsequent examination and management are primordial. While most of the cases are due to physiological changes, as gestational thrombocytopenia, other causes can be related to severe conditions that can lead to fetal or maternal death. Differentiating these conditions might be challenging: they can be pregnancy-specific (pre-eclampsia/HELLP syndrome [hemolysis, elevated liver enzymes, low platelets]), or not (immune thrombocytopenia purpura, thrombotic thrombocytopenic purpura or hemolytic uremic syndrome). Understanding the mechanisms and recognition of symptoms and signs is essential to decide an adequate line of investigation. The severity of thrombocytopenia, its etiology and gestational age dictates different treatment regimens.

Immune Thrombocytopenia Purpura

Key Points Two Types: Acute and ChronicDiagnosis: Established by excluding known causes of thrombocytopeniaTreatment: Depends on the platelet count and the presence and severity of bleeding.When therapy is indicated, the primary treatment options for the newly diagnosed patient are: CorticosteroidsIntravenous immunoglobulinIntravenous anti-D Ig