Thrombotic Thrombocytopenic Purpura due to Checkpoint Inhibitors.

Ipilimumab is a monoclonal antibody that enhances the efficacy of the immune system by targeting a cytotoxic T-lymphocyte-associated protein 4 (CTLA-4), which is a protein receptor that downregulates the immune system. Nivolumab is also a humanized monoclonal antibody that targets another protein receptor that prevents activated T cells from attacking the cancer; this receptor is called programmed cell death 1 (PD-1). The FDA approved ipilimumab combined with nivolumab as a frontline therapy for patients with metastatic melanoma or renal cell carcinoma and as a second-line therapy for patients with microsatellite instability-high (MSI-H) metastatic colon cancer.

Plasmapheresis therapy for rare but potentially fatal reaction to rituximab.

Rituximab (Rituxan), a genetically engineered chimeric murine and human IgG1 monoclonal antibody directed against CD20 antigen, is an emerging drug used for a wide spectrum of disease processes and found to be relatively safe. We report a near-fatal reaction to rituximab, which started 30 min after infusion and worsened over 24 to 48 h, resulting in hemodynamic and respiratory compromise that necessitated both intubation and high-dose vasopressors. Subsequent treatment with plasmapheresis helped stabilize and improve the patient's clinical condition, and the patient was discharged home on hospital day 5.

Therapeutic plasma exchange performed in parallel with extra corporeal membrane oxygenation for antibody mediated rejection after heart transplantation.

We report on the feasibility, safety, and efficacy of performing therapeutic plasmapheresis (TPE) in parallel with extracorporeal membrane oxygenation (ECMO) to alleviate antibody mediated rejection (AMR) after heart transplantation. Two pediatric and one adult patient presented with severe congestive heart failure and respiratory distress after heart transplantation and required ECMO support. TPE was initiated to treat AMR while patients remained on ECMO.