The Viscoelastic Properties of a Decompressive Craniectomy Site toward Clinical Application
Background: Decompressive craniectomy (DC) is a neurosurgical procedure in which part of the skull is removed to rescue from acute brain edema.We often palpate the stiffness of a cranial defect in a patient with DC due to prospect the brain stiffness.Object: This study aims to evaluate viscoelastic property of a DC site in bed-side by using a tactile resonance sensor with a stress–strain function.We would like to discuss the relationship between viscoelastic properties and tissue elastance of a DC site.Method: Seven participants were measured the viscoelastic properties of a DC site under stable conditions.This sensor had the push-pull motor automatically and measured simultaneously both pressure (Pr) and change in frequency (dF) for a measured depth.This handheld device was adjusted to come in contact with skin surface for clinical application of a palpation-like usage.Results: We plotted the average scatter graphs of Pr and dF for the depth.So we calculated the shear elastic modulus (G) by using the Lee & Radok’s correspondence principle under the assumption of an isotropic,small deformation of a spherical indentation.The exponential curve fitting was presumed as the viscoelastic model with 1 spring and 3 dumpers.The Poisson’ ratio (v) was 0.447 from G-value and Young’s modulus.The tissue elastance (=ΔP/ΔV) was evaluated as elastance = Ge*0.00246 at depth 3.0mm.Conclusions: The measurement of viscoelastic properties of a decompressive site yielded the following values under the stable conditions: Ge = 1.714 ± 0.75 and v=0.447.This technique was no adverse effect.The G-value of a decompressive site was reflected to the tissue elastance at the max depth.The stiffness of a decompressive site might be close to brain stiffness.
brain decompressive craniectomy elastance human
H. Nagai D. Takada M. Kanbara T. Yoshigane S. Hagiwara M. Daisu K. Sugimoto T. Miyazaki Y. Akiyama
Department of Neurosurgery, Shimane University Faculty of Medicine, Izumo City, Japan
国际会议
World Congress on Medical Physics and Biomedical Engineering (2012年医学物理及生物医学工程国际会议(IFMBE))
北京
英文
256-259
2012-05-26（万方平台首次上网日期，不代表论文的发表时间）