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Micro-albuminuria in Ugandan children with sickle cell anaemia: a cross-sectional study
M Mawanda1, J M Ssenkusu, A Odiit
1Department of Paediatrics, St Mary's Hospital Lacor, Gulu, Uganda. Mawandamp@yahoo.co.uk
Insights
Micro-albuminuria is common in children with sickle cell anaemia (SCA), affecting 28.2%. Older age, more transfusions, and urine nitrites increase risk, while higher hemoglobin levels are protective.
Area of Science:
- Nephrology
- Pediatrics
- Hematology
Background:
- Sickle cell anaemia (SCA) causes progressive kidney damage due to repeated vaso-occlusive events in the renal cortex.
- Micro-albuminuria, a marker of early kidney damage, arises from compensatory mechanisms to maintain glomerular filtration rate in SCA patients.
Purpose of the Study:
- To determine the prevalence of micro-albuminuria in children diagnosed with SCA.
- To identify factors associated with the development of micro-albuminuria in this pediatric population.
Main Methods:
- A cross-sectional study involving 305 children aged 2-18 years with SCA was conducted.
- Urine and serum analyses were performed to assess micro-albuminuria, creatinine, and albumin levels.
- Logistic regression analysis identified factors associated with micro-albuminuria.
Main Results:
- The prevalence of micro-albuminuria was 28.2% among the studied children with SCA.
- Multivariate analysis revealed that increasing age, a higher number of blood transfusions, and the presence of urine nitrites were significantly associated with micro-albuminuria.
- Conversely, higher hemoglobin levels demonstrated a protective effect against micro-albuminuria.
Conclusions:
- Micro-albuminuria is prevalent in children with SCA, indicating a need for early detection and management.
- Screening for micro-albuminuria is recommended for SCA patients over five years of age.
- Close monitoring of SCA patients with lower hemoglobin levels is crucial due to its association with micro-albuminuria.
Background:
In patients with sickle cell anaemia (SCA), recurrent episodes of sequestration, micro-infarction, ischaemia and necrosis within the renal cortex cause nephron damage. Micro-albuminuria results from compensatory mechanisms aimed at preserving the glomerular filtration rate.
Aims:
To establish the prevalence of micro-albuminuria among children with SCA and to describe associated factors.
Methods:
A cross-sectional study of patients aged 2-18 years with SCA was undertaken at the sickle cell clinic, Mulago Hospital, Kampala between November 2007 and April 2008. Haemoglobin was measured and urine dipstick was used to determine protein, glucose, red blood cells and nitrites, serum creatinine and albumin and urine creatinine and albumin. Binary logistic regression was performed to determine factors associated with micro-albuminuria.
Results:
Of 305 children studied, 48·2% were male. The mean (SD) age of the study participants was 9·7 (4·9) years. The prevalence of micro-albuminuria (30-300 μg/mg) was 28·2% (86/305, 95% CI 23·1-33·3). Use of diclofenac (p = 0·01) and ibuprofen (p = 0·001) were found to increase the risk of micro-albuminuria only by bivariate analysis. By multivariate analysis, increasing age (p = 0·001), a higher number of blood transfusions (p = 0·001) and presence of urine nitrites (p = 0·031) were associated with a risk of micro-albuminuria, whereas high levels of haemoglobin (p = 0·018) were protective. There was no association between estimated glomerular filtration rate and micro-albuminuria.
Conclusions:
The prevalence of micro-albuminuria among children with SCA is relatively high. SCA patients over 5 years of age should be screened for micro-albuminuria. Those with lower haemoglobin levels should be monitored closely because of its association with micro-albuminuria.
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