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Is Skeletal Muscle Ventricle Chronic Stability Dependent on Wall Stress? Design Implications
Author(s) -
Gustafson Kenneth J.,
Sweeney James D.,
Gibney John,
FiebigMathine Lee Ann
Publication year - 2006
Publication title -
artificial organs
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.684
H-Index - 76
eISSN - 1525-1594
pISSN - 0160-564X
DOI - 10.1111/j.1525-1594.2006.00177.x
Subject(s) - isovolumetric contraction , limiting , ventricle , medicine , materials science , chemistry , cardiology , blood pressure , mechanical engineering , diastole , engineering
Chronic skeletal muscle ventricle (SMV) stability is essential for clinical implementation. SMVs in animal models have chronically expanded or collapsed when exposed to physiologic pressures. SMV wall stress is a more appropriate indicator than pressure or geometry to compare SMVs between studies. SMV wall tensions during conditioning were determined for SMVs that collapsed, expanded, or were isovolumetric in a previous study. Wall stresses in SMVs that expanded (2.76 ± 0.803 N/cm 2 ) were significantly greater than isovolumetric SMVs (0.89 ± 0.450) and SMVs that collapsed (0.88 ± 0.451). These data support the existence of minimum and maximum wall stresses for SMV volume stability and provide empiric estimates for SMV design. Scaling SMV designs from animal models with smaller volumes and similar pressures may result in greater wall stresses in clinical designs. Therefore, the use of volume limiting implants or an isovolumetric conditioning phase to increase the wall stress expansion threshold may be required.