Sickle Cell Crisis

Sickle cell crisis, a hallmark of sickle cell anemia, arises from the unique pathophysiology of this inherited hemoglobinopathy. The condition, characterized by a point mutation in the beta chain of the globin gene, leads to the synthesis of abnormal HbS protein, causing various crises. Vaso-occlusive crises, resulting from the obstruction of blood flow by sickle cells, are predominant and often lead to auto-splenectomy in these patients. The flexibility loss of red blood cell membranes during deoxygenation triggers cyclical and un-sickling, culminating in irreversible sickle forms and a heightened risk of crises. Additionally, patients may experience Aplastic, Megaloblastic, and Hemolytic crises resembling other hemolytic anemia conditions. This chapter provides a concise overview of the diverse crises associated with sickle cell anemia, shedding light on their underlying mechanisms and clinical implications.