Linked Life Data

2048918

Source:http://linkedlifedata.com/resource/pubmed/id/2048918

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
3
pubmed:dateCreated
1991-7-17
pubmed:abstractText
A better understanding of the velocity profiles in the cardiac chambers and great vessels should allow more accurate estimation of cardiac output and valve surface area by Doppler echocardiography. The velocity profile in the left ventricular outflow tract was studied by Colour Doppler in 12 patients with pure valvular aortic stenosis with normal left ventricular function and compared with a control population of 12 normal subjects. The selected recordings were digitised and stocked on a laser optic disc. Measurement of the angle of incidence of the line of colour aliasing with respect to the interventricular septum was performed manually on a colour video display unit. A program of digitised image processing allowed the tracing of the axes of reference defining the angle of incidence measured at peak systole. The average angle of incidence was 40.7 +/- 5.6 degrees in the control population and 56.8 +/- 6.8 degrees in aortic stenosis; therefore, in this condition, the angle was significantly flatter (less acute) (p less than 0.001). The correlation between the angle of incidence and the transvalvular pressure gradient was poor (r = 0.24). These results suggest that: real time ambulatory analysis of isovelocity profiles in the left ventricular outflow tract is possible by using the phenomenon of colour aliasing: the presence of an obstacle to left ventricular ejection tends to flatten the velocity profile, justifying the use of the continuity equation in patients with calcific aortic stenosis but questioning its systematic use in control populations of normal subjects used as a reference.
pubmed:language
fre
pubmed:journal
pubmed:citationSubset
IM
pubmed:status
MEDLINE
pubmed:month
Mar
pubmed:issn
0003-9683
pubmed:author
pubmed:issnType
Print
pubmed:volume
84
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
337-42
pubmed:dateRevised
2009-2-13
pubmed:meshHeading
pubmed:year
1991
pubmed:articleTitle
[Color-Doppler study of the velocity profile of the left ventricular outflow tract in normal subjects and in patients with valvular aortic stenosis].
pubmed:affiliation
Service de réanimation médicale, hôpital Louis-Mourier, Colombes.
pubmed:publicationType
Journal Article, English Abstract