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Correlations between heart sound components and hemodynamic variables.
Sci Rep
April 2024
Department of Anesthesiology and Pain Medicine, Asan Medical Center, Brain Korea 21 Project, University of Ulsan College of Medicine, 88, Olympic-ro 43-gil, Songpa-gu, Seoul, 05505, Korea.
Article Synopsis
- * Different drugs were administered to manipulate cardiac contractility and vascular resistance, and the correlation between heart sound changes (specifically S1 amplitude) and blood pressure metrics was analyzed.
- * The findings suggest that changes in S1 amplitude are closely linked to cardiac contractility variations, but not significantly related to vascular resistance changes, indicating the potential for non-invasive monitoring of hemodynamic conditions.
All Optical Speckle Contrast-Based Vibration Sensor for Photoacoustic Signal Detection.
Sensors (Basel)
April 2022
Faculty of Engineering and the Nanotechnology Center, Bar Ilan University, Ramat Gan 5290002, Israel.
Remote detection of photoacoustic signals is a well desired ability, enabling to perform advanced imaging in scenarios where contact is not possible. Various unique solutions have been suggested, including a camera-based speckle contrast photoacoustic detection. In this manuscript, a significant upgrade to the camera-based speckle contrast approach is presented and experimentally demonstrated.
View Article and Find Full Text PDFSource separation from single-channel abdominal phonocardiographic signals based on independent component analysis.
Biomed Eng Lett
February 2021
Electrical Engineering Department, Engineering Faculty, University of Zanjan, Zanjan, Iran.
: Continuous monitoring of fetal heart rate (FHR) is essential to diagnose heart abnormalities. Therefore, FHR measurement is considered as the most important parameter to evaluate heart function. One method of FHR extraction is done by using fetal phonocardiogram (fPCG) signal, which is obtained directly from the mother abdominal surface with a medical stethoscope.
View Article and Find Full Text PDFQuantitative Analysis of an Intraoperative Digitalized Esophageal Heart Sound Signal to Speculate on Perturbed Cardiovascular Function.
J Clin Med
May 2019
Biosignal Analysis and Perioperative Outcome Research Laboratory, Department of Anesthesiology and Pain Medicine, Asan Medical Center, University of Ulsan College of Medicine, 88, Olympic-ro 43-gil, Songpa-gu, Seoul 05505, Korea.
Although visualization of heart sounds, known as phonocardiography, provides valuable information on cardiovascular hemodynamics, its use has not been widely encouraged due to the scarcity of information on its interpretation. In the present study, using the intraoperative phonocardiogram recorded by an esophageal stethoscope, we quantitatively evaluated the time and frequency domains of modulation of the heart sounds components and their association with left ventricular contractility and systemic vascular resistance under the effects of various cardiovascular drugs. We analyzed 29 pairs of intraoperative digitalized phonocardiographic signals and their corresponding hemodynamic data before and after cardiovascular drug administration (ephedrine, esmolol, phenylephrine, and/or nicardipine) in 17 patients who underwent liver transplantation.
View Article and Find Full Text PDFDevelopment of artificial neural network-based algorithms for the classification of bileaflet mechanical heart valve sounds.
Int J Artif Organs
April 2012
Department of Industrial Engineering, University of Padua, Padua - Italy.
Objectives: As is true for all mechanical prostheses, bileaflet heart valves are prone to thrombus formation; reduced hemodynamic performance and embolic events can occur as a result. Prosthetic valve thrombosis affects the power spectra calculated from the phonocardiographic signals corresponding to prosthetic closing events. Artificial neural network-based classifiers are proposed for automatically and noninvasively assessing valve functionality and detecting thrombotic formations.
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