作者在以前曾报导能在临床上成功地应用氙—133廓清法来对皮肤和皮瓣的局部血流量作出定量的估价。近五年来,作者应用氙—133廓清法对延迟的各种类型三角胸瓣的三角肌区的远端部份的局部血流量作了测定。本文在有关皮瓣转移的最佳时间和发生坏死的危险性的关系方面对延迟现象下的血流动力学进行了研究。材料和方法: 将氙—133廓清率作为三角肌区延迟术 The authors previously reported the successful clinical application of xenon-133 clearance to make a quantitative estimate of the local blood flow to the skin and flap. In the past five years, the authors applied the xenon-133 clearance method to determine the delayed flow of the distal part of the deltoid region of various types of triangular thorax. This article has studied the hemodynamics of delayed phenomena in relation to the optimal timing of flap transfer and the risk of developing necrosis. MATERIALS AND METHODS: The xenon-133 clearance rate was used as a delay in the deltoid region