title: Pulse pressure waveform estimation using distension profiling with contactless optical probe.
abstract: The pulse pressure waveform has, for long, been known as a fundamental biomedical signal and its analysis is recognized as a non-invasive, simple, and resourceful technique for the assessment of arterial vessels condition observed in several diseases. In the current paper, waveforms from non-invasive optical probe that measures carotid artery distension profiles are compared with the waveforms of the pulse pressure acquired by intra-arterial catheter invasive measurement in the ascending aorta. Measurements were performed in a study population of 16 patients who had undergone cardiac catheterization. The hemodynamic parameters: area under the curve (AUC), the area during systole (AS) and the area during diastole (AD), their ratio (AD/AS) and the ejection time index (ETI), from invasive and non-invasive measurements were compared. The results show that the pressure waveforms obtained by the two methods are similar, with 13% of mean value of the root mean square error (RMSE). Moreover, the correlation coefficient demonstrates the strong correlation. The comparison between the AUCs allows the assessment of the differences between the phases of the cardiac cycle. In the systolic period the waveforms are almost equal, evidencing greatest clinical relevance during this period. Slight differences are found in diastole, probably due to the structural arterial differences. The optical probe has lower variability than the invasive system (13% vs 16%). This study validates the capability of acquiring the arterial pulse waveform with a non-invasive method, using a non-contact optical probe at the carotid site with residual differences from the aortic invasive measurements.
authors.affiliation: Instrumentation Center, Physics Department, University of Coimbra, Coimbra, Portugal. Electronic address: taniapereira@lei.fis.uc.pt.
authors.forename: Tânia
authors.initials: T
authors.lastname: Pereira
authors.affiliation: Instrumentation Center, Physics Department, University of Coimbra, Coimbra, Portugal.
authors.forename: Inês
authors.initials: I
authors.lastname: Santos
authors.affiliation: Instrumentation Center, Physics Department, University of Coimbra, Coimbra, Portugal.
authors.forename: Tatiana
authors.initials: T
authors.lastname: Oliveira
authors.affiliation: Instrumentation Center, Physics Department, University of Coimbra, Coimbra, Portugal.
authors.forename: Pedro
authors.initials: P
authors.lastname: Vaz
authors.affiliation: Coimbra College of Health Technology, Coimbra, Portugal.
authors.forename: Telmo
authors.initials: T
authors.lastname: Pereira
authors.affiliation: Coimbra College of Health Technology, Coimbra, Portugal.
authors.forename: Helder
authors.initials: H
authors.lastname: Santos
authors.affiliation: Instrumentation Center, Physics Department, University of Coimbra, Coimbra, Portugal; ISA-Intelligent Sensing Anywhere, Coimbra, Portugal.
authors.forename: Helena
authors.initials: H
authors.lastname: Pereira
authors.affiliation: Instrumentation Center, Physics Department, University of Coimbra, Coimbra, Portugal.
authors.forename: Carlos
authors.initials: C
authors.lastname: Correia
authors.affiliation: Instrumentation Center, Physics Department, University of Coimbra, Coimbra, Portugal.
authors.forename: João
authors.initials: J
authors.lastname: Cardoso
mesh_terms: D000368:Aged; D019540:Area Under Curve; D001794:Blood Pressure; D005260:Female; D006801:Humans; D008297:Male; D055096:Optical Devices; D011673:Pulsatile Flow
keywords: Arterial pulse pressure waveform; Cardiac catheterization; Distension profile; Non-invasive measurement; Optical probe; Pulse wave analysis