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Article type: Research Article
Authors: Martini, Romeoa; * | Bagno, Andreab
Affiliations: [a] Department of Cardio-Thorax and Vascular Sciences, Unit of Angiology, Azienda Ospedaliera Universitaria di Padova, Italy | [b] Department of Industrial Engineering, Università di Padova, Italy
Correspondence: [*] Corresponding author: Romeo Martini, Department of Cardio-Thorax and Vascular Sciences, Unit of Angiology, Azienda Ospedaliera Universitaria di Padova, Italy. E-mail: [email protected].
Abstract: The wavelet analysis has been applied to the Laser Doppler Fluxmetry for assessing the frequency spectrum of the flowmotion to study the microvascular function waves. Although the application of wavelet analysis has allowed a detailed evaluation of the microvascular function, its use does not seem to be yet widespread over the last two decades. Aiming to improve the diffusion of this methodology, we herein present a systematic review of the literature about the application of the wavelet analysis to the laser Doppler fluxmetry signal. A computer research has been performed on PubMed and Scopus databases from January 1990 to December 2017. The used terms for the investigation have been “wavelet analysis”, “wavelet transform analysis”, “Morlet wavelet transform” along with the terms “laser Doppler”, “laserdoppler” and/or “flowmetry” or “fluxmetry”. One hundred and eighteen studies have been found. After the scrutiny, 97 studies reporting data on humans have been selected. Fifty-three studies, 54.0% (95% CI 44.2–63.6) pooled rate, have been performed on 892 healthy subjects and 44, 45,9 % (95% CI 36.3–55.7%) pooled rate have been performed on 1679 patients. No significant difference has been found between the two groups (p 0,81). On average, the number of studies published each year was 4.8 (95% CI 3.4–6.2). The trend of studies production has increased significantly from 1998 to 2017, (p 0.0006). But only the studies on patients have shown a significant increase trend along the years (p 0.0003), than the studies on healthy subjects (p 0.09). In conclusion, this review highlights that despite being a promising and interesting methodology for the study of the microcirculatory function, the wavelet analysis has remained still neglected.
Keywords: Wavelet analysis, laser Doppler fluxmetry, microvascular function
DOI: 10.3233/CH-189903
Journal: Clinical Hemorheology and Microcirculation, vol. 70, no. 2, pp. 213-229, 2018
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