Sickle cell anaemia is a hereditary blood disorder marked by abnormal hemoglobin, known as hemoglobin S (HbS). Under conditions of low oxygen tension, dehydration, or acidosis, this abnormal hemoglobin polymerizes into rigid fibers. These stiff fibers distort the flexible, biconcave red blood cells into a crescent or sickle shape.
These fragile, misshapen cells have a drastically reduced lifespan, dropping from the normal 120 days down to about 10 to 20 days, which triggers chronic hemolytic anaemia. Furthermore, their rigid structures cause them to stick to vascular endothelium and clump together, blocking microvascular blood flow and causing localized ischemia, pain, and eventual organ damage.
Sickle cell anaemia follows an autosomal recessive inheritance pattern. A child must inherit two abnormal hemoglobin genes—one from each parent—to develop the disease. Individuals who inherit only one abnormal gene are known as sickle cell carriers, possessing the HbAS genotype (trait), while those with two abnormal genes have the HbSS genotype.
Pre-marital and neonatal screening programs are vital public health tools in Nigeria to identify carriers and counsel couples on reproductive risks.
The clinical presentation of sickle cell anaemia varies widely from person to person, but chronic fatigue, pallor, and jaundice are nearly universal due to ongoing hemolysis and anaemia. Jaundice occurs because the rapid breakdown of red blood cells overwhelms the liver's ability to conjugate and excrete bilirubin.
Children often present with dactylitis, also known as hand-foot syndrome, which is painful swelling of the hands and feet caused by micro-infractions in the small bones. Splenomegaly is common in early childhood, but repeated infarctions eventually lead to autosplenectomy, leaving the patient highly vulnerable to encapsulated bacterial infections.
A sickle cell crisis represents an acute exacerbation of symptoms that requires urgent medical intervention. The types of crises include:
Nursing management focuses on adequate hydration, aggressive pain relief with analgesics, oxygen therapy if oxygen saturation is low, and treating any underlying infection.
Accurate diagnosis relies on hematological and biochemical evaluations. The gold standard confirmatory test is hemoglobin electrophoresis, which separates different types of hemoglobin based on their electrical charge and movement through a medium.
Public health strategies for sickle cell anaemia center on prevention, early detection, and reducing complication rates in endemic regions. Routine immunization programs protect asplenic patients from severe infections caused by Streptococcus pneumoniae, Haemophilus influenzae, and meningococci.
Prophylactic daily oral penicillin is commonly prescribed for young children to prevent pneumococcal sepsis. Additionally, community education campaigns target pre-marital counseling to reduce the incidence of affected births through informed partner choices.
Nurses play a central role in managing sickle cell anaemia by promoting comfort, preventing crises, and empowering families through education. Care plans must address physical pain while recognizing the emotional and psychological toll of a chronic, unpredictable illness.
Patient education focuses on avoiding known crisis triggers:
Chronic ischemia and recurrent infarctions over many years lead to progressive damage across multiple organ systems. Multi-disciplinary care is essential to monitor and manage these long-term complications: