OSIET journal of Communication & Electronics, May 2012
DICROTIC NOTCH DETECTION AND ANALYSIS OF ARTERIAL
PULSE BY USING DISCRETE WAVELET
J.Bethanney Janney,Sai Sruthi.P
Department of Biomedical Engineering
Sathyabama University, Chennai-119, India.
[email protected], [email protected]
Arterial pulse wave shows physical characteristics of heart, mean reports of a pulse and
pressure changes when blood spouted from heart. The dicrotic notch (fall on the downward
slope) indicates the cessation of systole and represents closure of the aortic valve and subsequent
retrograde flow. The location of the dicrotic notch varies according to the timing of aortic closure
in the cardiac cycle. Dicrotic notch plays a significant role in diagnosing sclerosis, occlusion,
stenosis, arterial spasm anderythromelalgia. Hence we have used Discrete Wavelet transform to
Detect and analyze the dicrotic notch in arterial pulse wave form. The arterial pulse data is
recorded using a data acquisition system (PHYSIOPACK) which comprises of multi channel
recording equipment with sensors and a PC to store the data for further analysis. The
homogeneous age group of 15 subjects was tested using two different wavelet tr namely Haar
and Daubuchies4 (db4). The peripheral pulse has a steep rise and a notch on falling slope in the
younger subjects, with older subjects a more gradual rise and fall and no pronounced dicrotic
notch were observed. The results obtained are compared between the two methods and found
that the Haar wavelet approximately matches with the ideal results.
Index Terms: Discrete Wavelet Transform (DWT), Dicrotic Notch, and Differentiation.