Data/hora: 13/06/2024 16:09:28

Provedor de dados: | 48
País: | Chile
Título: | Regional differences in veins wall viscosity, compliance. energetics and damping: analysis of the pressure-diameter relationship during cyclical overloads
Autores: | ZÓCALO,YANINA; BIA,DANIEL; LLUBERAS,SEBASTIÁN; ARMENTANO,RICARDO L.
Data: | 2008-01-01
Ano: | 2008
Palavras-chave: | Compliance; Damping; Energetic; Vascular physiology; Venous wall; Viscosity.
Resumo: | Background: The characterization of the dynamic process of veins walls is essential to understand venous functioning under normal and pathological conditions. However, little work has been done on dynamic venous properties. Aim: To characterize vein compliance (C), viscosity (&amp;#951;), peak-strain (W St) and dissipated (W D) energy, damping (&amp;#958;), and their regional differences in order to evalúate their role in venous functioning during volume-pressure overloads. Methods: In a mock circulation, pressure (P) and diameter (D) of different veins (anterior cava, jugular and femoral; from 7 sheep), were registered during cyclical volume-pressure pulses. From the P-D relationship, C, W St and &amp;#958; (at low and high P-D leveis), &amp;#951; and W D were calculated. Resulls: For each vein there were P-dependent differences in biomechanical, energetics, and damping capability. There were regional-differences in C, &amp;#951;), W St and W D (p&lt;0.05), but not in &amp;#958;. Conclusión: The regional-dependent differences in dynamics and energetics, and regional-similitude in damping could be important to ensure venous functioning during acute overloads. The lower C and higher W St and W D found in back-limb veins (femoral), commonly submitted to high volume-pressure loads (i.e. during walking), could be considered relevant to ensure adequate venous system functionality and venous wall protection simultaneously.
Tipo: | Journal article
Idioma: | Inglês
Identificador: | http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602008000200012
Editor: | Sociedad de Biología de Chile
Formato: | text/html
Fonte: | Biological Research  v.41 n.2 2008