Intra-Observer Variability of Longitudinal Displacement and Intramural Shear Strain Measurements of the Arterial Wall Using Ultrasound Noninvasively in vivo

2010 ◽  
Vol 36 (5) ◽  
pp. 697-704 ◽  
Author(s):  
Magnus Cinthio ◽  
Åsa Rydén Ahlgren
2012 ◽  
Vol 302 (5) ◽  
pp. H1102-H1115 ◽  
Author(s):  
Åsa Rydén Ahlgren ◽  
Magnus Cinthio ◽  
Stig Steen ◽  
Tobias Nilsson ◽  
Trygve Sjöberg ◽  
...  

The effects of catecholamines on longitudinal displacements and intramural shear strain of the arterial wall are unexplored. Therefore, the common carotid artery of five anaesthetized pigs was investigated using an in-house developed noninvasive ultrasonic technique. The study protocol included intravenous infusion of low-dose epinephrine (β-adrenoceptor activation), as well as intravenous boluses of norepinephrine (α-adrenoceptor activation). Further, the effects of β-blockade (metoprolol) were studied. There were significant positive correlations between pulse pressure and longitudinal displacement of the intima-media complex ( r = 0.72; P < 0.001), as well as between pulse pressure and intramural shear strain ( r = 0.48; P < 0.001). Following administration of norepinephrine, the longitudinal displacement of the intima-media complex and intramural shear strain profoundly increased (median 190%, range 102–296%, and median 141%, range 101–182%, respectively, compared with baseline), also when given during β-blockade (median 228%, range 133–266%, and median 158%, range 152–235%, respectively). During infusion of low-dose epinephrine, the longitudinal displacement of the intima-media complex and intramural shear strain decreased (median 88%, range 69–122%, and median 69%, range 47–117%, respectively, compared with baseline). In conclusion, the present study shows, for the first time, that the longitudinal displacement and intramural shear strain of the porcine carotid artery undergo profound changes in response to catecholamines. Increase in longitudinal displacements seems to be strongly related to α-adrenoceptor activation. Thus metoprolol is insufficient to counteract a profound increase in longitudinal displacement and intramural shear strain following a surge of norepinephrine.


Circulation ◽  
1996 ◽  
Vol 94 (7) ◽  
pp. 1698-1704 ◽  
Author(s):  
Klaus Juul ◽  
Lars B. Nielsen ◽  
Klaus Munkholm ◽  
Steen Stender ◽  
Børge G. Nordestgaard

1982 ◽  
Vol 72 (5) ◽  
pp. 1707-1715
Author(s):  
Frand Wyatt ◽  
Kent Beckstrom ◽  
Jon Berger

abstract An instrument has been developed to monitor the horizontal displacement of near-surface monuments, so as to reduce the noise of observatory-based strain measurements. The device measures the shear strain in the upper 24 m of the earth's crust using an equal path length Michelson interferometer. The magnitude of the observations (∼50 μm) indicates that such measurements are needed to interpret the records produced by precision strainmeters.


2003 ◽  
Vol 25 (4) ◽  
pp. 289-298 ◽  
Author(s):  
K.B. Chandran ◽  
J.H. Mun ◽  
K.K. Choi ◽  
J.S. Chen ◽  
A. Hamilton ◽  
...  

2011 ◽  
Vol 5 (4) ◽  
pp. 195
Author(s):  
T. Idzenga ◽  
S. Holewijn ◽  
H.H.G. Hansen ◽  
C.L. De Korte

1980 ◽  
pp. 426-429
Author(s):  
R. Vasu ◽  
D.R. Carter ◽  
D.M. Spengler ◽  
R.T. Dueland

1981 ◽  
pp. 19-24
Author(s):  
E.S. Bessman ◽  
D.R. Carter ◽  
W.H. Harris

2000 ◽  
Vol 82-B (4) ◽  
pp. 591-594 ◽  
Author(s):  
C. Milgrom ◽  
A. Finestone ◽  
A. Simkin ◽  
I. Ekenman ◽  
S. Mendelson ◽  
...  

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