Document Detail


Role of left ventricular mass/volume ratio on transmitral flow velocity patterns from infancy to childhood.
MedLine Citation:
PMID:  9482139     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Age-related changes in left ventricular diastolic filling have been reported to occur in normal children in studies using Doppler echocardiographic methods. However, little information currently exists on the relationships between transmitral flow velocity patterns and the left ventricular mass. We measured left ventricular end-diastolic volume, left ventricular mass, mass/volume ratio, and transmitral flow velocity patterns by M-mode and Doppler echocardiography in 165 normal children aged 5 days to 195 months. Subjects were divided into 6 age groups: <1; 1 to <3; 3 to <5; 5 to <7; 7 to <9; and > or = 9 years old. The left ventricular end-diastolic volume and mass increased progressively with increasing age. However, the mass/volume ratio in infants <1 year was significantly higher than that in infants 1 to <3 years (1.32+/-0.25 vs. 1.14+/-0.16, p<0.01) without any changes of the ratio thereafter. The peak E wave in infants <1 year was significantly lower than that in 1 to <3 years (71+/-18 vs. 92+/-13 cm/s, p<0.01) without changes thereafter. As the flow velocity time integral of E wave increased and that of A wave remained constant, the flow velocity time integral of E/A wave increased with increasing age. The early diastolic tilling fraction in infants <1 year was lower than that in infants 1 to 3 years. (0.61+/-0.07 vs. 0.70+/-0.06, p<0.01). The atrial filling fraction in infants <1 year was higher than that in infants 1 to <3 years (0.40+/-0.08 vs. 0.30+/-0.06, p<0.01) with a little decrease thereafter. The peak E wave, early diastolic tilling fraction, and the atrial filling fraction correlated with the logarithm of age (p<0.01). Age-related changes in these Doppler echocardiographic findings suggest reduced left ventricular early diastolic filling patterns. The mass/volume ratio correlated linearly with peak E wave, early diastolic filling fraction, and atrial filling fraction (r=-0.38, -0.33, and 0.26, p<0.01). No significant relationships between mass/volume ratio and the other Doppler indices were found. Thus, the age-related reduction in the mass/volume ratio may be one of the mechanisms underlying age-related changes in the early diastolic ventricular filling as assessed by Doppler echocardiography.
Authors:
K Harada; T Suzuki; K Shimada; G Takada
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  International journal of cardiology     Volume:  63     ISSN:  0167-5273     ISO Abbreviation:  Int. J. Cardiol.     Publication Date:  1998 Jan 
Date Detail:
Created Date:  1998-04-06     Completed Date:  1998-04-06     Revised Date:  2006-07-12    
Medline Journal Info:
Nlm Unique ID:  8200291     Medline TA:  Int J Cardiol     Country:  IRELAND    
Other Details:
Languages:  eng     Pagination:  9-14     Citation Subset:  IM    
Affiliation:
Department of Pediatrics, Akita University School of Medicine, Hondo, Japan.
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MeSH Terms
Descriptor/Qualifier:
Aging / physiology*
Blood Flow Velocity
Child
Child, Preschool
Diastole / physiology
Echocardiography, Doppler
Heart Ventricles / ultrasonography
Humans
Infant
Infant, Newborn
Mitral Valve / physiology*
Reference Values
Stroke Volume / physiology*
Ventricular Function, Left / physiology*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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