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Related Concept Videos

Korotkoff Sounds01:12

Korotkoff Sounds

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Korotkoff sounds are the specific sounds heard while measuring blood pressure using a sphygmomanometer, typically with a stethoscope or a Doppler device. They are named after Russian physician Nikolai Korotkov, who first described them in 1905. These sounds correspond to turbulent blood flow in the artery as the blood pressure cuff is gradually released after inflation.
During blood pressure assessment, inflating the cuff 30 millimeters of mercury above the patient's systolic blood pressure...
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Heart Sounds01:15

Heart Sounds

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Heart sounds are generated by the turbulence in blood flow due to the closing of heart valves. These sounds are best perceived slightly away from the valves, where the blood flow disseminates the sound.
Auscultation is the process of listening to these internal body sounds using a stethoscope. The heart produces four types of sounds, but only two—S1 and S2—can usually be heard with a stethoscope.
S1, also known as the "lub" sound, is caused by the closure of atrioventricular (A-V)...
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Soundness of Cement01:17

Soundness of Cement

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The soundness of cement refers to the ability of cement paste to retain its volume after setting. Unsound cement can lead to expansion and structural damage due to the presence of free lime, magnesia, and calcium sulfate. Free lime hydrates very slowly, expanding and causing unsoundness, which is difficult to detect because it intercrystallizes with other compounds. Magnesia also reacts with water, forming crystals that can disrupt the cement's structure. Calcium sulfate can create...
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Sound Waves01:01

Sound Waves

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Sound waves can be thought of as fluctuations in the pressure of a medium through which they propagate. Since the pressure also makes the medium's particles vibrate along its direction of motion, the waves can be modeled as the displacement of the medium's particles from their mean position.
Sound waves are longitudinal in most fluids because fluids cannot sustain any lateral pressure. In solids, however, shear forces help in propagating the disturbance in the lateral direction as well....
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Sound Intensity00:58

Sound Intensity

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The loudness of a sound source is related to how energetically the source is vibrating, consequently making the molecules of the propagation medium vibrate. To measure the loudness of a source, the physical quantity of interest is the intensity. This is defined as the energy emitted per unit of time per unit of area perpendicular to the sound wave's propagation direction. Since the total energy is greater if the source vibrates for a longer duration and over a larger area, dividing the...
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Speed of Sound in Gases01:08

Speed of Sound in Gases

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The speed of sound in a gaseous medium depends on various factors. Since gases constitute molecules that are free to move, they are highly compressible. Hence, sound waves travel slowly through gases. Thermodynamics helps us understand the relationship between pressure, volume, and temperature of gases, thus, the speed of sound in an ideal gas can be determined using the laws of thermodynamics. At the same time, Newton's laws of motion and the continuity equation of fluid dynamics also come...
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Author Spotlight: A Stable Phantom Material for Optical and Acoustic Imaging
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Author Spotlight: A Stable Phantom Material for Optical and Acoustic Imaging

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Sound differences between electronic and acoustic stethoscopes.

Lukasz J Nowak1, Karolina M Nowak2

  • 1Institute of Fundamental Technological Research, Polish Academy of Sciences, Pawinskiego 5B, 02-106, Warsaw, Poland. lnowak@ippt.pan.pl.

Biomedical Engineering Online
|August 5, 2018
PubMed
Summary
This summary is machine-generated.

Electronic stethoscopes may offer different diagnostic sound parameters than acoustic models. These acoustic variations could impact diagnostic accuracy, necessitating clearer guidelines for electronic stethoscope use.

Keywords:
Acoustic diagnosticsAuscultationElectronic stethoscopeStethoscope

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Area of Science:

  • Medical Diagnostics
  • Acoustic Engineering
  • Biomedical Signal Processing

Background:

  • Electronic stethoscopes are evolving from traditional acoustic stethoscopes for medical diagnostics.
  • Despite functional overlap, their operational principles and sound transmission differ significantly.
  • This raises questions about diagnostic consequences in clinical practice.

Purpose of the Study:

  • To investigate the acoustic parameter differences between electronic and acoustic stethoscopes.
  • To assess the potential impact of these differences on diagnostic quality.

Main Methods:

  • Heart auscultation signals were recorded using four electronic and one acoustic stethoscope.
  • Signals were synchronized with electrocardiogram (ECG) recordings and segmented.
  • A dedicated algorithm extracted and analyzed acoustic parameters from representative datasets.

Main Results:

  • Significant variations in acoustic characteristics were found among the tested stethoscopes.
  • The acoustic stethoscope served as a reference point for comparison.

Conclusions:

  • Differences in transmitted sound among stethoscope models can affect diagnostic quality.
  • Current terminology and application guidelines for electronic stethoscopes may be misleading and require revision.