Linked Life Data

8481245

Source:http://linkedlifedata.com/resource/pubmed/id/8481245

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
2
pubmed:dateCreated
1993-6-2
pubmed:abstractText
Because the motion of the base of the heart plays a central role in its filling and emptying, we developed an original method to characterize the base motion dynamics throughout each cycle by use of pulsed Doppler echocardiography. A 100 Hz wall filter and low gain settings were used to record the low-frequency, high-energy Doppler signals generated by the motion of the base. From the apical four-chamber view, the sample volume was placed at the lateral margin and at the common septal margin of the tricuspid and mitral annuli. These signals were differentiated from left and right atrioventricular flows by their opposite direction, higher energy, timing, and unique audio signal. The dynamics of the cardiac base were quantitated in 17 normal subjects (31 +/- 13 years). The time relationship between transvalvular flows and the motion of the base was studied in nine normal subjects by matching recordings at the same RR interval. The Doppler signal of the motion of the cardiac base showed a succession of positive (apically directed) and negative (atrially directed) velocity waves. Differences in the dynamics of the cardiac base were demonstrated between its left and right components, probably related to different loading conditions and different myocardial mechanical properties. The relationship between the motion of the base and mitral flow as shown in this study suggests that Doppler-measured mitral flow velocity underestimates relative left ventricular inflow velocity with respect to the atrium by about 17% at peak early flow and by 20% at peak late flow. The method reported in the present study allows a more informative noninvasive quantitation of the cardiac base motion derived from measurements of its velocity, excursion, and acceleration. This new method may provide unique information on the left ventricular and right ventricular performance in the meridional direction.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:status
MEDLINE
pubmed:issn
0894-7317
pubmed:author
pubmed:issnType
Print
pubmed:volume
6
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
166-76
pubmed:dateRevised
2007-11-14
pubmed:meshHeading
pubmed:articleTitle
Quantitation of the motion of the cardiac base in normal subjects by Doppler echocardiography.
pubmed:affiliation
Department of Medicine, University of California, San Francisco.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S., Research Support, Non-U.S. Gov't