Sickle cell haemoglobinopathies in England

Area of Science:

• Hematology
• Pediatric Medicine
• Genetics

Background:

• Sickle cell disease (SCD) is a group of inherited red blood cell disorders.
• Different genotypes of SCD, including HbS homozygotes (SS), sickle thalassaemia (S thal), and HbS/HbC (SC) disease, can lead to varying clinical manifestations.
• Understanding regional variations in SCD presentation is crucial for effective management.

Purpose of the Study:

• To prospectively study the clinical course and outcomes of sickle cell disease in children in Birmingham.
• To compare the incidence of specific complications and mortality rates among different SCD genotypes (SS, S thal, SC).
• To assess growth and sexual maturation in children with sickle cell anemia (SS).

Main Methods:

• Prospective study of 96 children with sickle cell disease in Birmingham between 1969 and 1979.
• Classification of patients into SS, S thal, and SC genotypes based on hemoglobin electrophoresis and family studies.
• Follow-up for an average of 5.1 years to record clinical events, mortality, and growth parameters.

Main Results:

• Annual mortality rates were 1.3% for SS, 0% for S thal, and 0.9% for SC children.
• Pulmonary illnesses and anemia crises were more frequent than reported in Jamaica.
• Leg ulceration was not observed in Birmingham, unlike in Jamaica and New York. Severe infections were less common than in New York, with no cases of salmonella osteomyelitis.

Conclusions:

• Sickle thalassaemia and SC disease generally present with milder illness compared to sickle cell anemia (SS).
• Children with SS often experienced impaired growth and sexual maturation.
• Regional differences in complication incidence (e.g., leg ulcers, severe infections) highlight the importance of geographic context in SCD management.