Document Detail


Age-associated changes in cardiovascular structure and function: a fertile milieu for future disease.
MedLine Citation:
PMID:  21809160     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Important changes occur in the cardiovascular system with advancing age, even in apparently healthy individuals. Thickening and stiffening of the large arteries develop due to collagen and calcium deposition and loss of elastic fibers in the medial layer. These arterial changes cause systolic blood pressure to rise with age, while diastolic blood pressure generally declines after the sixth decade. In the left ventricle, modest concentric wall thickening occurs due to cellular hypertrophy, but cavity size does not change. Although left ventricular systolic function is preserved across the age span, early diastolic filling rate declines 30-50% between the third and ninth decades. Conversely, an age-associated increase in late diastolic filling due to atrial contraction preserves end-diastolic volume. Aerobic exercise capacity declines approximately 10% per decade in cross-sectional studies; in longitudinal studies, however, this decline is accelerated in the elderly. Reductions in peak heart rate and peripheral oxygen utilization but not stroke volume appear to mediate the age-associated decline in aerobic capacity. Deficits in both cardiac β-adrenergic receptor density and in the efficiency of postsynaptic β-adrenergic signaling contribute significantly to the reduced cardiovascular performance during exercise in older adults. Although these cardiovascular aging changes are considered "normative", they lower the threshold for the development of cardiovascular disease, which affects the majority of older adults.
Authors:
Jerome L Fleg; James Strait
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-8-2
Journal Detail:
Title:  Heart failure reviews     Volume:  -     ISSN:  1573-7322     ISO Abbreviation:  -     Publication Date:  2011 Aug 
Date Detail:
Created Date:  2011-8-2     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9612481     Medline TA:  Heart Fail Rev     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
Division of Cardiovascular Sciences, National Heart, Lung, and Blood Institute, 6701 Rockledge Drive, Room 8150, Bethesda, MD, 20892, USA, flegj@nhlbi.nih.gov.
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