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Sleep pathology characterization in sickle cell disease: case-control study.

Maria Inês Mascarenhas1, Helena Cristina Loureiro, Teresa Ferreira

  • 1Pediatric Department, Hospital Prof. Doutor Fernando Fonseca, Lisbon, Portugal; Sickle Cell Disease Pediatric Group Pediatric Department, Hospital Prof. Doutor Fernando Fonseca, Lisbon, Portugal.

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|July 22, 2014
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Summary

Children with sickle cell disease (SCD) experience lower minimum blood oxygen levels during sleep compared to peers, despite similar sleep apnea severity. Sleep evaluations are crucial for preventing complications in these children.

Keywords:
OSASnocturnal hypoxemiasickle cell disease

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Area of Science:

  • Pediatric Sleep Medicine
  • Hematology
  • Respiratory Medicine

Background:

  • Children and adolescents with sickle cell disease (SCD) exhibit a higher prevalence of sleep disorders, including obstructive sleep apnea syndrome (OSAS).
  • Nocturnal hypoxemia in SCD patients poses risks for vaso-occlusive crises and other disease-related morbidities.
  • Understanding sleep disturbances in SCD is critical for comprehensive patient management.

Purpose of the Study:

  • To compare polysomnography (PSG) findings in children with SCD against a control group of children with suspected OSAS but without SCD.
  • To identify specific sleep-related differences between pediatric SCD patients and a matched control group.

Main Methods:

  • A retrospective study design was employed, comparing clinical and PSG parameters between two groups of children.
  • Statistical analysis included descriptive statistics and t-tests, with a significance level set at P < 0.05.
  • The study involved 65 children with SCD and 65 age- and gender-matched controls with suspected OSAS.

Main Results:

  • No significant differences were observed in sleep architecture, including sleep phase percentages, sleep efficiency, and sleep latency between the SCD and control groups.
  • Children with SCD demonstrated significantly lower mean SpO2 and minimum SpO2 levels compared to controls (P < 0.01).
  • Enuresis was reported significantly more frequently in the SCD group (35.4%) than in the control group (6.2%, P < 0.01).

Conclusions:

  • Sleep architecture is comparable between children with and without SCD, but minimum SpO2 is significantly reduced in SCD patients.
  • Despite similar apnea-hypopnea index (AHI) values, lower SpO2 in SCD children highlights a critical issue requiring attention.
  • Routine sleep evaluation is essential for SCD children to prevent associated complications and comorbidities.