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Fetal haemoglobin and early manifestations of homozygous sickle cell disease
K Bailey1, J S Morris, P Thomas
1Department of Child Health, University of the West Indies, Kingston, Jamaica.
Insights
Fetal hemoglobin (HbF) levels impact sickle cell disease (SCD) complications. Low HbF increases risks for dactylitis, pain, acute chest syndrome, and splenic sequestration in children with sickle cell disease.
Area of Science:
- Hematology
- Pediatric Medicine
- Genetics
Background:
- Sickle cell disease (SCD) is a genetic blood disorder with significant early clinical manifestations.
- Fetal hemoglobin (HbF) is known to modulate SCD severity, but its precise impact on specific early complications requires further elucidation.
- Understanding HbF's role is crucial for predicting disease progression and tailoring interventions in pediatric SCD patients.
Purpose of the Study:
- To investigate the relationship between fetal hemoglobin (HbF) concentration and the development of early clinical manifestations in homozygous sickle cell disease (SS).
- To examine the time to first occurrence and proportional hazard of SCD complications across different HbF concentration groups at age 5 years.
- To identify specific complications where HbF levels are most predictive of risk.
Main Methods:
- Retrospective analysis of early clinical manifestations in homozygous sickle cell disease (SS) patients.
- Patients were stratified into three groups based on fetal hemoglobin (HbF) concentration at age 5 years.
- Time to first occurrence and proportional hazard models were used to assess the relationship between HbF levels and specific complications.
Main Results:
- Fetal hemoglobin (HbF) concentration was significantly associated with dactylitis, painful crises, acute chest syndrome, and acute splenic sequestration.
- A critically low HbF concentration was linked to an increased risk of these complications, with minimal risk difference between medium and high HbF groups.
- Abdominal painful crises and hypersplenism showed no significant relationship with HbF concentration, suggesting other pathogenic mechanisms may be involved.
Conclusions:
- Lower fetal hemoglobin (HbF) levels significantly elevate the risk for several early sickle cell disease (SCD) complications.
- Targeted parental education regarding acute splenic sequestration should prioritize children with the lowest HbF concentrations for their age.
- These findings highlight the importance of monitoring HbF levels for risk stratification and management in pediatric SCD.
Abstract:
The relevance of fetal haemoglobin (HbF) concentration to the development of early clinical manifestations of homozygous sickle (SS) disease has been investigated by examining the time to first occurrence and the proportional hazard of these complications in three groups of the HbF distribution at age 5 years. HbF was significantly related to dactylitis, painful crises, acute chest syndrome, and acute splenic sequestration. The relationship suggested that a critically low HbF concentration increased the risk, little difference in risk occurring between the medium and high HbF groups. The abdominal painful crisis and hypersplenism were not related to HbF concentration suggesting that the degree of sickling may not be important in their genesis. Parental education on acute splenic sequestration should be focused on children with HbF concentrations in the lowest part of the HbF distribution for age.