The adventitia reduces left ventricular dynamic afterload via smooth muscle activation-dependent machanisms
Introduction and objectives. Ventricular dynamic afterload depends on arterial viscoelastic and geometric properties. Vasoactive factors produced in the adventitia modulate arterial tone. However, it is still not known whether the adventitia is involved in determining the magnitude of the dynamic af...
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| Lenguaje: | Spanish |
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| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_03008932_v60_n5_p501_Bia |
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todo:paper_03008932_v60_n5_p501_Bia2023-10-03T15:17:55Z The adventitia reduces left ventricular dynamic afterload via smooth muscle activation-dependent machanisms Bia, D. Zócalo, Y. Armentano, R.L. Camus, J. de Forteza, E. Cabrera-Fischer, E. Adventitia Arterial impedance Basic research Dynamic afterload Hemodynamics Physiology Smooth muscle Vascular biology adventitia animal tissue arterial pressure artery blood flow artery compliance artery diameter artery tone article brachiocephalic trunk controlled study heart afterload hemodynamic parameters impedance in vitro study in vivo study mathematical analysis muscle contractility muscle tone nonhuman pulse wave sheep smooth muscle viscoelasticity animal connective tissue female heart left ventricle function physiology vascular smooth muscle Animals Brachiocephalic Trunk Connective Tissue Female Muscle, Smooth, Vascular Sheep Ventricular Function, Left Introduction and objectives. Ventricular dynamic afterload depends on arterial viscoelastic and geometric properties. Vasoactive factors produced in the adventitia modulate arterial tone. However, it is still not known whether the adventitia is involved in determining the magnitude of the dynamic afterload. The aim of this study was to investigate the role played by the adventitia, via smooth muscle-dependent mechanisms, in determining dynamic afterload. Methods. The diameter, pressure and flow in brachiocephalic trunks from sheep were measured before and after removal of the adventitia, both in vivo with muscular reactivity preserved (n=8) and in vitro with muscular reactivity abolished (n=8). All studies were performed under similar hemodynamic conditions. Dynamic afterload was determined from elastic and viscous arterial responses, elastic and viscous work, arterial characteristic impedance, and pulse wave velocity. Comparison of in vivo and in vitro findings enabled smooth muscle-dependent changes to be evaluated. Results. Only in vivo, did removal of the adventitia lead to a reduction in vessel diameter (17.32 [2.02] vs 15.46 [1.28] mm) and to increases in elastic (7.21 [1.39] vs 15.59 [3.00] × 10 6 dyn.cm -2) and viscous (5.16 [2.04] vs 9.87 [2.00] × 10 5 dyn.s.cm -2) arterial responses, elastic (6.15 [1.08] vs 9.20 [0.76] × 10 -2 J/m 2 ) and viscous work (11.61 [2.25] vs 15.20 [2.37] × 10 -3 J/m 2), impedance (223.97 [136.11] vs 396.33 [182.27] dyn · s · cm -3), and pulse wave velocity (397.70 [31.21] vs 598.78 [28.04] cm.s -1) (P<.05). The reduction in diameter and the increases in elastic and viscous responses are evidence of muscular activation. Conclusions. The adventitia may contribute to the control of ventricular dynamic afterload by means of mechanisms dependent on muscular tone. JOUR Spanish info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_03008932_v60_n5_p501_Bia |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| language |
Spanish |
| orig_language_str_mv |
Spanish |
| topic |
Adventitia Arterial impedance Basic research Dynamic afterload Hemodynamics Physiology Smooth muscle Vascular biology adventitia animal tissue arterial pressure artery blood flow artery compliance artery diameter artery tone article brachiocephalic trunk controlled study heart afterload hemodynamic parameters impedance in vitro study in vivo study mathematical analysis muscle contractility muscle tone nonhuman pulse wave sheep smooth muscle viscoelasticity animal connective tissue female heart left ventricle function physiology vascular smooth muscle Animals Brachiocephalic Trunk Connective Tissue Female Muscle, Smooth, Vascular Sheep Ventricular Function, Left |
| spellingShingle |
Adventitia Arterial impedance Basic research Dynamic afterload Hemodynamics Physiology Smooth muscle Vascular biology adventitia animal tissue arterial pressure artery blood flow artery compliance artery diameter artery tone article brachiocephalic trunk controlled study heart afterload hemodynamic parameters impedance in vitro study in vivo study mathematical analysis muscle contractility muscle tone nonhuman pulse wave sheep smooth muscle viscoelasticity animal connective tissue female heart left ventricle function physiology vascular smooth muscle Animals Brachiocephalic Trunk Connective Tissue Female Muscle, Smooth, Vascular Sheep Ventricular Function, Left Bia, D. Zócalo, Y. Armentano, R.L. Camus, J. de Forteza, E. Cabrera-Fischer, E. The adventitia reduces left ventricular dynamic afterload via smooth muscle activation-dependent machanisms |
| topic_facet |
Adventitia Arterial impedance Basic research Dynamic afterload Hemodynamics Physiology Smooth muscle Vascular biology adventitia animal tissue arterial pressure artery blood flow artery compliance artery diameter artery tone article brachiocephalic trunk controlled study heart afterload hemodynamic parameters impedance in vitro study in vivo study mathematical analysis muscle contractility muscle tone nonhuman pulse wave sheep smooth muscle viscoelasticity animal connective tissue female heart left ventricle function physiology vascular smooth muscle Animals Brachiocephalic Trunk Connective Tissue Female Muscle, Smooth, Vascular Sheep Ventricular Function, Left |
| description |
Introduction and objectives. Ventricular dynamic afterload depends on arterial viscoelastic and geometric properties. Vasoactive factors produced in the adventitia modulate arterial tone. However, it is still not known whether the adventitia is involved in determining the magnitude of the dynamic afterload. The aim of this study was to investigate the role played by the adventitia, via smooth muscle-dependent mechanisms, in determining dynamic afterload. Methods. The diameter, pressure and flow in brachiocephalic trunks from sheep were measured before and after removal of the adventitia, both in vivo with muscular reactivity preserved (n=8) and in vitro with muscular reactivity abolished (n=8). All studies were performed under similar hemodynamic conditions. Dynamic afterload was determined from elastic and viscous arterial responses, elastic and viscous work, arterial characteristic impedance, and pulse wave velocity. Comparison of in vivo and in vitro findings enabled smooth muscle-dependent changes to be evaluated. Results. Only in vivo, did removal of the adventitia lead to a reduction in vessel diameter (17.32 [2.02] vs 15.46 [1.28] mm) and to increases in elastic (7.21 [1.39] vs 15.59 [3.00] × 10 6 dyn.cm -2) and viscous (5.16 [2.04] vs 9.87 [2.00] × 10 5 dyn.s.cm -2) arterial responses, elastic (6.15 [1.08] vs 9.20 [0.76] × 10 -2 J/m 2 ) and viscous work (11.61 [2.25] vs 15.20 [2.37] × 10 -3 J/m 2), impedance (223.97 [136.11] vs 396.33 [182.27] dyn · s · cm -3), and pulse wave velocity (397.70 [31.21] vs 598.78 [28.04] cm.s -1) (P<.05). The reduction in diameter and the increases in elastic and viscous responses are evidence of muscular activation. Conclusions. The adventitia may contribute to the control of ventricular dynamic afterload by means of mechanisms dependent on muscular tone. |
| format |
JOUR |
| author |
Bia, D. Zócalo, Y. Armentano, R.L. Camus, J. de Forteza, E. Cabrera-Fischer, E. |
| author_facet |
Bia, D. Zócalo, Y. Armentano, R.L. Camus, J. de Forteza, E. Cabrera-Fischer, E. |
| author_sort |
Bia, D. |
| title |
The adventitia reduces left ventricular dynamic afterload via smooth muscle activation-dependent machanisms |
| title_short |
The adventitia reduces left ventricular dynamic afterload via smooth muscle activation-dependent machanisms |
| title_full |
The adventitia reduces left ventricular dynamic afterload via smooth muscle activation-dependent machanisms |
| title_fullStr |
The adventitia reduces left ventricular dynamic afterload via smooth muscle activation-dependent machanisms |
| title_full_unstemmed |
The adventitia reduces left ventricular dynamic afterload via smooth muscle activation-dependent machanisms |
| title_sort |
adventitia reduces left ventricular dynamic afterload via smooth muscle activation-dependent machanisms |
| url |
http://hdl.handle.net/20.500.12110/paper_03008932_v60_n5_p501_Bia |
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