摘要
采用放射性生物微球技术观察了经受40和120d尾部悬吊模拟失重大鼠冠脉血流量及冠脉阻力的变化。40及120d悬吊大鼠冠脉血流量分别较其相应对照组减少25%(P<0.01)和22%(P<0.05);而40d组和120d组的冠脉阻力与其相应配对对照组相比分别升高37%(P<0.05)和31%(P<0.05)。此外,悬吊40d与悬吊120d组大鼠左心室重量分别较其配对的对照组大鼠要减轻9%(P<0.05)及5%(P<0.01)。结果表明,长期模拟失重大鼠心脏可能处于低动力状态,从而使心肌的代谢活动减弱并可能发生萎缩。
The aim of this study was to investigate whether the enhanced ultrastructural degradation changes found previously in the myocardium of the tail-suspended rats were accompanied by an alteration in the coronary blood flow. Male Sprague-Dawley rats were either subjected to a modified tail-suspension for 40 days (n=10) or 120 days (n=9) or served as pair-fed controls.The coronary blood flow of the entire left ventricle was determined in anesthetized rats by left atrial injection of the biologic microspheres prepared by labeling the red cells of toads with NaCrO4 and then fixing it in 1% glutaraldehyde. Following 40-day or 120-day tail-suspension, the left ventricular weight was decreased by 9%(P<0.05) or 5% (P<0.01) respectively as compared with the pair-fed control animals, implicating the occurrence of the myocardial atrophy. The coronary blood flow of the entire left ventricle was decreased by 25% (P<0.01) or 22%(P<0.05), while the coronary resistance increased by 37% (P<0.05) or 31% (P<0.05) in 40-day or 120-day tail-suspended rats respectively as compared with the values of control rats.The results are in accordance with the previously observed morphologic changes and indicate an attenuated myocardial metabolic activity in hypodynamic state of the heart during the long-term simulated weightlessness.
出处
《中国应用生理学杂志》
CAS
CSCD
1994年第3期198-201,共4页
Chinese Journal of Applied Physiology
基金
国家自然科学基金
关键词
模拟失重
冠状动脉
血流量
simulated weightlessness
coronary blood flow
heart status
tail-suspended rat