Objective To analyse pulse transit time variability (PTTV) in frequency domain and to study the physiological interpretation of PTTV. Methods Pulse transit time (PTT) was obtained by ECG and PPG (photoplethysmography) from 187 subjects.

• 目的分析脉搏波传导时间变异性(pulse transit time variability,PTTV),研究PTTV的生理意义。