完整马白线的体内生物动力学特性。

C A Kirker-Head, P J Kerwin, R R Steckel, C T Rubin
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引用次数: 14

摘要

在8匹马的完整白线(LA)的三个位置手术植入液态金属应变片(LMSG)。记录全麻、麻醉恢复、站立、发声、直肠触诊、步行、小跑和跑步时的LA应变、应变率、应变和应力变化。采用体外张力法定量测定LA应力。应力-应变响应随位置的不同而有显著差异(P < 0.05),但在粘弹性组织中均表现出特征关系。麻醉恢复过程中出现最大峰值应力、峰值应变和应变变化。应变速率最大值出现在中心。腹部绷带没有提供一致的应变大小变化。尾侧LA比颅骨LA承受更大的应力和应变。LA应变随节奏周期性变化。综上所述:LMSGs是一种适合记录LA生物动力学的技术;LA的动态特性在整个长度上是不均匀的;LA适合适应剧烈活动带来的快速加速/减速力,否则可能会对腹部脏器造成伤害;LA合成应变随步幅相位变化显著。这意味着通过减少运动和术后直肠触诊可以减少切口开裂的可能性。这些数据将为今后的实验室研究提供更准确的生理条件表征。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The in vivo biodynamic properties of the intact equine linea alba.

Liquid metal strain gauges (LMSG) were implanted surgically at three locations on the intact linea alba (LA) in eight horses. LA strain, strain rate, change in strain and stress were recorded during general anaesthesia, recovery from anaesthesia, standing, vocalisation, rectal palpation and at the walk, trot and canter. LA stress was quantitated using an in vitro tensiometric technique. Stress-strain responses differed significantly (P < 0.05) with location, but each described a characteristic relationship for viscoelastic tissues. Maximum peak stress, peak strain and change in strain occurred during anaesthetic recovery. Maximum strain rate occurred at the canter. An abdominal bandage provided no consistent change in strain magnitude. The caudal LA experienced greater stress and strain than the cranial LA. LA strain varied cyclically with cadence. It was concluded that: LMSGs provide a suitable technique for recording LA biodynamics; the dynamic properties of the LA are not homogenous throughout its length; the LA is suited to accommodate the rapid acceleration/deceleration forces associated with strenuous activity which might otherwise cause injury to abdominal viscera; and LA resultant strain alters significantly with phase of stride. It was implied that the likelihood of incisional dehiscence is reduced by minimising exercise and rectal palpation post operatively. The data will permit a more accurate representation of physiological conditions for future laboratory studies.

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