More evidences indicate that the increased blood pressure variability(BPV)has some relations with arteriosclerosis and development of plaques, also it will lead to the cardiovascular disease [1].Blood pressure variability is usually assessed in the time domain.Standard deviation(SD), coefficient of variability(CV), average real variability(ARV)are the most used BPV indices.However, the prognostic significance of the BPV indices in frequency domain was less reported.Therefore, in this study, we will investigate whether beat-to-beat BPV in frequency domain can evaluate the occurrence of carotid plaques in the early stage.
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