The carotid body--a quantitative assessment in children
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The carotid body
Area of Science:
- Pediatric Anatomy
- Respiratory Physiology
- Sudden Infant Death Studies
Background:
- The carotid body is a crucial chemoreceptor organ.
- Understanding its development and variations is vital for pediatric research.
- Previous studies have not fully characterized glomic tissue volume across early life stages.
Purpose of the Study:
- To quantify the glomic tissue volume in carotid bodies from infancy through early childhood.
- To investigate potential correlations between glomic tissue volume and age or cause of death.
- To establish normative ranges for carotid body glomic tissue volume.
Main Methods:
- Utilized serial sectioning and point counting techniques.
- Analyzed carotid bodies from 100 infants (29 weeks gestation to 9.5 years).
- Included infants with unexpected home deaths to assess potential pathological changes.
Main Results:
- A 10-fold variation in carotid body and glomic tissue volume was observed across all studied ages.
- No significant carotid body enlargement was evident in most unexpected deaths.
- A potential for enlargement was noted in children aged one year or older who died unexpectedly.
Conclusions:
- Carotid body glomic tissue volume exhibits significant inter-individual variability from birth to 9.5 years.
- Unexpected deaths do not consistently correlate with carotid body enlargement, except possibly in older infants.
- Normative data on carotid body volume are established for pediatric populations.
Abstract:
The volume of the glomic tissue in the carotid bodies of 100 infants between the ages of 29 weeks gestation and 9 1/2 years has been determined by serial sections and point counting. There is a 10-fold variation in the size of the carotid body and the volume of glomic tissue at all ages studied. Forty of the infants died as unexpected deaths at home. No increase in size of the carotid body is apparent in the majority of these deaths but there is a probability that enlargement occurs in some children dying at the age of one year or older. Ranges of values and means are presented for the carotid body glomic tissue volume from birth to 9 1/2 years.