Preparation of (R, R)-fenoterol and (R, R)- or (R, S)-fenoterol analogues and their use in treating congestive heart failure.

非诺特罗和（R，R）-或（R，S）-非诺特罗类似物的制备及其在治疗充血性心力衰竭中的应用。

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Objective To study structure of the unstable periodic orbits (UPOs) of R-R interval signals of heart during orthostatic standing, and to reveal the dynamic characters of heart rate variability (HRV).

目的研究立位心脏R- R间期信号的非稳定周期轨道的结构，进一步探讨心率变异（HRV）的动力学特征。

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The invention relates to a magnetic resonance imager, which can draw out coronary artery, when the heart beat (R-R) of patient changes.

本发明提供一种即使在患者的心跳（R-R）变化了的情况下也能够适当地描绘出冠状动脉的磁共振成像装置。

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