Comparison of heart rate variability with pulse transit time during general anesthesia

Abstract

The relation between stiffness of the blood vessel and ANS(autonomic nervous system) is observed by comparing the distribution of the PSD and the change of the PTT appeared the stiffness of the blood vessel at the pre-anaesthesia, sevoflurane anaesthesia and intubation after states. In this paper, PSD of the HRV well-known of the index of the ANS activity reflected the ANS activity according to anesthesia stages. Effect of LF during the anesthesia is similar to PTT changes. This means that PTT analysis is useful index reflecting the body state because of well appearing the ANS activity during svoflurane anestheisa. And this analysis is useful because the calculating method is simple and time is short compare with the method of HRV PSD.