Comparison of heart sounds recorded with an electronic stethoscope and an accelerometer
Denmark (IMCC) - Aalborg University, Aalborg
Department of Health Science and Technology, Aalborg University, Fredrik Bajersvej 7, 9220 Aalborg, Denmark
Johannes Jan Struijk
Johannes Jan Struijk
English, Scandinavian languages
4 weeks
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Type of Research Project
- Basic science
What is the background of the project?
Cardiac auscultation using an electronic stethoscope gives the opportunity to record the audio signal and to compare it with other methods to record cardiac sound. One such alternative methods is seismocardiography, where heart sound is recorded using an accelerometer attached to the skin. At first sight, the measured signals have many similarities, although they are far from identical. A systematic comparison of the two methods has never been shown in the literature, although many claims have been made for the diagnostic performance of seismocardiography. It must be mentioned that more than 80% of the energy of the sound recorded using a stethoscope is in an inaudible range (sub 20 Hz) and that this low-frequency signal is in itself highly informative about the myocardial contraction / relaxation.
What is the aim of the project?
The objective is a qualitative comparison of heart sounds recorded with an electronic stethoscope and with an accelerometer.
What techniques and methods are used?
All recording equipment is available in our lab and can be used in the project. This includes various Littmann electronic stethoscopes and custom made seismocardiographic (accelerometer) equipment. In addition a lot of data has already been recorded. The student will record heart sounds from a few healthy volunteers under various controlled circumstances: from different positions on the chest, with different pressures exerted with the stethoscope, and both in a supine and a sitting position. Analysis of the signals will be partly done by a qualitative comparison and partly by computer analysis (support is available). One of the conclusions will focus on whether the accelerometer signals provide the same clinically relevant features in the heart sounds as the stethoscope, and whether the low frequency part of the accelerometer signal may contain clinically relevant information that is not available from the stethoscope.
What is the role of the student?
- The tasks of the student will be performed on his/her own
- The tasks will be done under supervision
What are the tasks expected to be accomplished by the student?
Work with healthy volunteers at the university and to analyse data obtained from the volunteers.The student will describe a limited protocol for the measurements, carry out those measurements on a number of volunteers and do an initial analysis of the recorded data. Custom designed computer analysis will be performed in collaboration with the supervisor. A short report of the methodology, results and a conclusion will be required. The project can thus be formed as a short but complete project from its initial definition, data acquisition, data analysis, and conclusion.
Will there be any theoretical teaching provided (preliminary readings, lectures, courses, seminars etc)
Background literature and specific literature will be made available.
What is expected from the student at the end of the research exchange? What will be the general outcome of the student?
- The student will prepare a scientific report
- No specific outcome is expected
What skills are required of the student? Is there any special knowledge or a certain level of studies needed?
Are there any legal limitations in the student’s involvement
Type of students accepted
This project accepts:
- Medical students
- Sørensen et al.; “Definition of Fiducial Points in the Normal Seismocardiogram”; In: Scientific Reports; Vol. 8; Iss. 1; 2018-12