Overview
Microangiopathic hemolytic anemia (MAHA) is characterized by the presence of schistocytes (fragmented red blood cells) on peripheral blood smear, indicative of microvascular damage leading to hemolysis and thrombosis 1.Diagnosis
Key Diagnostic Criteria: Presence of schistocytes on peripheral blood smear, often with other morphological changes in red blood cells 1.
Recommended Tests: Peripheral blood smear analysis following International Council for Standardization in Hematology (ICSH) recommendations for schistocyte determination 1.
Grading: Schistocyte percentage can help differentiate between various underlying conditions; higher percentages (>1%) often correlate with more severe disease states 1.Management
First-Line Treatments: Specific treatments depend on underlying etiology; for example, plasma exchange in suspected thrombotic thrombocytopenic purpura (TTP) 1.
Adjunctive Treatments: Supportive care including blood transfusions, management of underlying conditions (e.g., sepsis, malignancy), and monitoring for complications 1.Special Populations
Pediatrics: Schistocytes are observed in preterm infants, indicating MAHA can occur in this population 1.
Comorbidities: Patients with chronic renal failure, sepsis, and metastatic carcinoma frequently exhibit schistocytes, suggesting careful evaluation of these comorbidities in MAHA diagnosis 1.Key Recommendations
Utilize ICSH guidelines for accurate schistocyte determination in diagnosing MAHA across various clinical contexts (Evidence: Moderate) 1.
Consider underlying etiologies beyond TTP/HUS, as schistocytes are commonly observed in conditions like sepsis and chronic renal failure (Evidence: Moderate) 1.
Tailor management strategies based on identified underlying causes, with specific interventions like plasma exchange reserved for confirmed TTP (Evidence: Expert opinion) 1.References
1 Huh HJ, Chung JW, Chae SL. Microscopic schistocyte determination according to International Council for Standardization in Hematology recommendations in various diseases. International journal of laboratory hematology 2013. link