Firas M. Salih, Omar Abdallah, Qasem Qananwah, and Armin Bolz
cardiovascular, vascular aging, area under the catacrotic phase of the photoplethysmogram pulse, arterial stiffness
Detection of the vascular aging is very important; because it gives indication of the associated increased risk of cardiovascular diseases at a stage when therapeutic intervention may be of benefit. The arterial aging is related to the arterial stiffness. To develop an inexpensive and easy method for general screening technique to avoid the future cardiovascular complexes due to the rising of the vascular aging a proposed algorithm depending on photoplethysmography was used. The aim of this study was to determine the association between the vascular aging and the normalized area under catacrotic phase of the photoplethysmogram pulse. The photoplethysmogram signal was acquired and then processed in MATLAB. The signals were filtered, peaks and valleys were detected, baseline wandering was removed, and normalization of the signal was achieved. The area under the catacrotic phase of the normalized photoplethysmogram pulse was calculated using trapezoidal algorithm. The data were collected from 46 volunteers with ages between 19-59 years. The correlation significance between the age and the normalized area under the catacrotic phase was noticed (r=-0.41, p=0.004); as the age increases the normalized area under the catacrotic phase decreases. It is concluded that the normalized area under the catacrotic phase of the photoplthysmogram can give indication of the vascular aging.
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