Document Detail

Stereologic study of the sinoatrial node of rats -- age related changes.
MedLine Citation:
PMID:  12510177     Owner:  NLM     Status:  MEDLINE    
Changes in the sinoatrial node represent the major mechanism of sudden death in humans, and because of the sparse knowledge about the effects of aging on this structure, light microscopic and quantitative studies of the sinoatrial node were undertaken. Twenty-one hearts were studied, seven rat hearts from each of the following age groups: three months of age, twelve months of age and eighteen months of age. In the stereologic study, the following parameters were studied: Vv([nc]) and Vv([interstitium]) % (the volume densities of the nodal cell and interstitium, determined by the point-counting method), and Nv([nc]) (1/mm(3)) (the numerical density of the nodal cell, determined by the disector method). The mean volume of the nodal cell (V([nc])) (microm(3)) was also determined. The comparisons showed that in the oldest animals, the volume density of the nodal cells decreased, while the volume density of the interstitium increased. Although numerical density of the nodal cell per volume of sinus node decreased, the nodal cells displayed increased mean volume with age. In conclusion, the aging process implies changes in the cell and fiber content of the sinoatrial node.
Silvana Regina de Melo; Romeu Rodrigues de Souza; Carlos Alberto Mandarim-de-Lacerda
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Biogerontology     Volume:  3     ISSN:  1389-5729     ISO Abbreviation:  Biogerontology     Publication Date:  2002  
Date Detail:
Created Date:  2003-01-02     Completed Date:  2003-08-04     Revised Date:  2003-11-14    
Medline Journal Info:
Nlm Unique ID:  100930043     Medline TA:  Biogerontology     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  383-90     Citation Subset:  IM    
Department of Morphophysiological Sciences, State University of Maringá, Av. Colombo, 5790, 87020-900, Maringá, Paraná, Brazil.
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MeSH Terms
Aging / physiology*
Rats, Wistar
Sinoatrial Node / anatomy & histology,  physiology*

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