Document Detail


Importance of transducer position in the assessment of apical rotation by speckle tracking echocardiography.
MedLine Citation:
PMID:  18356018     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
BACKGROUND: Speckle tracking echocardiography is increasingly used to quantify left ventricular (LV) twist. However, one of the limitations of the assessment of LV twist by speckle tracking echocardiography is the crucial dependence on correct acquisition of a LV apical short-axis. This study sought to assess the influence of transducer position on LV apical rotation measurements. METHODS: The study population consisted of 58 consecutive healthy volunteers (mean age 38 +/- 13 years, 25 men). To obtain parasternal short-axis images at the LV apical level, the following protocol was used. From the standard parasternal position (LV and aorta most inline, with the mitral valve tips in the middle of the sector) an as-circular-as-possible short-axis image of the LV apex, just proximal to the level with end-systolic LV luminal obliteration, was obtained by angulation of the transducer (position 1). From this position, the position of the transducer was changed to one (position 2) and two (position 3) intercostal spaces more caudal with subsequent similar transducer adaptations. RESULTS: In 8 volunteers (14%) parasternal image quality was insufficient for speckle tracking echocardiography. In 13 volunteers (22%) the LV apical short-axis could only be obtained from one transducer position. In the remaining volunteers with two (n = 27) or three (n = 10) available transducer positions, a more caudal transducer position was associated with increased measured LV apical rotation. Mean measured LV apical rotation was 5.2 +/- 1.8 degrees at position 1, 7.3 +/- 2.6 degrees at position 2 (P < .001), and 8.7 +/- 2.2 degrees at position 3 (P < .001 vs position 1 and P < .05 vs position 2). CONCLUSION: A more caudal transducer position is associated with increased measured LV apical rotation.
Authors:
Bas M van Dalen; Wim B Vletter; Osama I I Soliman; Folkert J ten Cate; Marcel L Geleijnse
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Publication Detail:
Type:  Journal Article     Date:  2008-03-20
Journal Detail:
Title:  Journal of the American Society of Echocardiography : official publication of the American Society of Echocardiography     Volume:  21     ISSN:  1097-6795     ISO Abbreviation:  J Am Soc Echocardiogr     Publication Date:  2008 Aug 
Date Detail:
Created Date:  2008-07-28     Completed Date:  2008-09-23     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8801388     Medline TA:  J Am Soc Echocardiogr     Country:  United States    
Other Details:
Languages:  eng     Pagination:  895-8     Citation Subset:  IM    
Affiliation:
Department of Cardiology, Thoraxcenter, Erasmus University Medical Center, Rotterdam, The Netherlands.
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MeSH Terms
Descriptor/Qualifier:
Adult
Echocardiography / instrumentation*,  methods*
Female
Heart Ventricles / ultrasonography*
Humans
Image Enhancement / methods*
Male
Reproducibility of Results
Rotation
Sensitivity and Specificity
Transducers*

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


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