The Adaptive Frequency Band for Blood Pressure Variability Measurement during Nonstationary ConditionsChia-Chi Chang1,2,3, Tzu-Chien Hsiao1,3,4 and Hung-Yi Hsu5*
- *Corresponding Author:
- Hung-Yi Hsu
Section of Neurology
Department of Internal Medicine
Tungs’ Taichung Metro Harbor Hospital
No. 699, Sec. 8, Taiwan Blvd, Wuci District
Taichung 435, Taiwan R.O.C
E-mail: [email protected]
Received date: November 11, 2014; Accepted date: December 15, 2014; Published date: December 18, 2014
Citation: Chang CC, Hsiao TC, Hsu HY (2014) The Adaptive Frequency Band for Blood Pressure Variability Measurement during Nonstationary Conditions. J Pulm Respir Med 5:230. doi:10.4172/2161-105X.1000230
Copyright: © 2014 Chang CC, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Background: The variation of blood pressure indicates the status of cardiovascular circulation. The spectral analysis of blood pressure variability (BPV) provides a way to quantitatively assess the variations by specific fixed frequency band. Blood pressure contains various non-stationary fluctuations and varies individually. It is hard to assess the non-stationary characteristics based on stationary method.
Method: Recently, a novel adaptive extraction method, called empirical mode decomposition (EMD), was proposed and is capable to extract the non-stationary intrinsic trends from blood pressure waveform. Results: The results showed that the non-stationary intrinsic trends extracted by EMD are high correlated to the power in conventional fixed frequency band (r>0.7).
Conclusions: This study examined the potential usage of EMD on BPV measurement and provided the reliable estimation of BPV based on adaptive frequency band. Moreover, the main frequency of the non-stationary trend can be evaluated by this method. It helps for cardiovascular studies and the optimal frequency band exploration.