Auscultation System for Acquisition of Vascular Sounds - Towards Sound-Based Monitoring of the Carotid Artery.

Autor:	Sühn T; INKA - Innovation Laboratory for Image Guided Therapy, Medizinische Fakultät, Otto-Von-Guericke-Universität, Magdeburg, Sachsen-Anhalt, Germany., Spiller M; INKA - Innovation Laboratory for Image Guided Therapy, Medizinische Fakultät, Otto-Von-Guericke-Universität, Magdeburg, Sachsen-Anhalt, Germany., Salvi R; IDTM GmbH, Castrop-Rauxel, Nordrhein-Westfalen, Germany., Hellwig S; IDTM GmbH, Castrop-Rauxel, Nordrhein-Westfalen, Germany., Boese A; INKA - Innovation Laboratory for Image Guided Therapy, Medizinische Fakultät, Otto-Von-Guericke-Universität, Magdeburg, Sachsen-Anhalt, Germany., Illanes A; INKA - Innovation Laboratory for Image Guided Therapy, Medizinische Fakultät, Otto-Von-Guericke-Universität, Magdeburg, Sachsen-Anhalt, Germany., Friebe M; INKA - Innovation Laboratory for Image Guided Therapy, Medizinische Fakultät, Otto-Von-Guericke-Universität, Magdeburg, Sachsen-Anhalt, Germany.
Jazyk:	angličtina
Zdroj:	Medical devices (Auckland, N.Z.) [Med Devices (Auckl)] 2020 Oct 30; Vol. 13, pp. 349-364. Date of Electronic Publication: 2020 Oct 30 (Print Publication: 2020).
DOI:	10.2147/MDER.S268057
Abstrakt:	Introduction: Atherosclerotic diseases of the carotid are a primary cause of cerebrovascular events such as stroke. For the diagnosis and monitoring angiography, ultrasound- or magnetic resonance-based imaging is used which requires costly hardware. In contrast, the auscultation of carotid sounds and screening for bruits - audible patterns related to turbulent blood flow - is a simple examination with comparably little technical demands. It can indicate atherosclerotic diseases and justify further diagnostics but is currently subjective and examiner dependent. Methods: We propose an easy-to-use computer-assisted auscultation system for a stable and reproducible acquisition of vascular sounds of the carotid. A dedicated skin-transducer-interface was incorporated into a handheld device. The interface comprises two bell-shaped structures, one with additional acoustic membrane, to ensure defined skin contact and a stable propagation path of the sound. The device is connected wirelessly to a desktop application allowing real-time visualization, assessment of signal quality and input of supplementary information along with storage of recordings in a database. An experimental study with 5 healthy subjects was conducted to evaluate usability and stability of the device. Five recordings per carotid served as data basis for a wavelet-based analysis of the stability of spectral characteristics of the recordings. Results: The energy distribution of the wavelet-based stationary spectra proved stable for measurements of a particular carotid with the majority of the energy located between 3 and 40 Hz. Different spectral properties of the carotids of one individual indicate the presence of sound characteristics linked to the particular vessel. User-dependent parameters such as variations of the applied contact pressure appeared to have minor influence on the general stability. Conclusion: The system provides a platform for reproducible carotid auscultation and the creation of a database of pathological vascular sounds, which is a prerequisite to investigate sound-based vascular monitoring. Competing Interests: TS, AB, AI and MF report a patent “MEDICAL ACOUSTIC SENSOR SYSTEM” (US 62/756487) pending. Stefan Hellwig reports a patent, Bloxton US-Patent pending. Rutuja Salvi and Stefan Hellwig are employees of IDTM GmbH. The authors report no other potential conflicts of interest in this work. (© 2020 Sühn et al.)
Databáze:	MEDLINE
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