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Influence of posture on left ventricular long- and short-axis shortening.
KTH, School of Technology and Health (STH), Environmental Physiology (Closed 20130701).ORCID iD: 0000-0001-6361-8965
2002 (English)In: American Journal of Physiology. Heart and Circulatory Physiology, ISSN 0363-6135, E-ISSN 1522-1539, Vol. 283, no 4, H1302-1306 p.Article in journal (Refereed) Published
Abstract [en]

End-diastolic volume and left ventricular stroke volume are increased in the supine compared with upright position, but the contribution of long-axis (LAS) and short-axis shortening (SAS) to these changes with change in posture has not been established. We examined long- and short-axis motion and dimensions with echocardiography in 10 healthy subjects in the upright and supine position. Long-axis length at end diastole was almost identical, whereas the diastolic short-axis diameter was increased in the supine position. At end systole, there was a decreased long-axis length and increased short-axis length in the supine vs. upright position. Both LAS and SAS were enhanced in supine vs. upright positions [LAS: 9.3 +/- 2.2 vs. 15.1 +/- 3.1 mm (P < 0.001); SAS: 12.7 +/- 3.2 vs. 16.3 +/- 2.8 mm (P < 0.001)], presumably via Starling mechanisms. LAS increased more in the lateral part of the mitral annulus than in the septal part [7.7 +/- 2.6 vs. 4.0 +/- 2.8 mm (P < 0.006)], which implies that the more spherical form, in the supine position, induces more stretch at the lateral free wall than in the ventricular septum. These findings support the notion that Starling mechanisms affect systolic LAS.

Place, publisher, year, edition, pages
2002. Vol. 283, no 4, H1302-1306 p.
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URN: urn:nbn:se:kth:diva-123240DOI: 10.​1152/​ajpheart.​01041.​2001OAI: diva2:625558
NR 20140805Available from: 2013-06-05 Created: 2013-06-05 Last updated: 2014-01-20Bibliographically approved

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Sundblad, Patrik
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Environmental Physiology (Closed 20130701)
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