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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.
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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.
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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

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Sound Intensity00:58

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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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Epilepsy is primarily characterized by unpredictable seizures, either provoked by an identifiable factor, such as injury or illness, or unprovoked, occurring spontaneously without apparent cause.
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Related Experiment Video

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Presynaptically Silent Synapses Studied with Light Microscopy
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Detecting silent seizures by their sound.

Josef Parvizi1, Kapil Gururangan2, Babak Razavi1

  • 1Department of Neurology and Neurological Sciences, Stanford University Medical Center, Stanford, CA, USA.

Epilepsia
|March 21, 2018
PubMed
Summary

Non-experts can detect seizures by listening to electroencephalograms (EEGs) converted into sound. This novel sonification method offers a practical tool for rapid seizure assessment, especially when specialists are unavailable.

Keywords:
EEG sonificationnonconvulsive status epilepticusrhythmic periodic patternsubclinical seizure

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Area of Science:

  • Neuroscience
  • Medical Technology
  • Signal Processing

Background:

  • Traditional electroencephalogram (EEG) interpretation requires specialized physician training.
  • Visual EEG analysis is challenging in critical care settings lacking immediate expert access.
  • Subclinical seizures, like nonconvulsive status epilepticus, necessitate rapid diagnosis.

Purpose of the Study:

  • To evaluate the efficacy of sonified EEG in enabling non-experts to detect seizures.
  • To compare the diagnostic performance of non-experts using sonified EEG versus visual EEG review.
  • To assess the potential of real-time EEG sonification as a triage tool.

Main Methods:

  • EEG data were converted into audible sound in real-time.
  • 84 EEG samples (seizures, seizure-like, non-rhythmic activity) were used.
  • Medical students and nurses, after brief training, listened to 15-second sonified EEG clips and classified them as "seizure" or "nonseizure."
  • Performance was compared to neurologists and students visually interpreting the same EEGs.

Main Results:

  • Non-experts using sonified EEG achieved high sensitivity in detecting seizures (students: 98%, nurses: 95%).
  • Specificity for identifying seizures or seizure-like activity was also high with sonified EEG (students: 85%, nurses: 82%).
  • Performance with sonified EEG surpassed that of non-experts and approached that of experts reviewing visual EEGs.

Conclusions:

  • Individuals without EEG training can effectively detect seizures by listening to sonified EEG.
  • EEG sonification serves as a valuable tool for rapid assessment of suspected subclinical seizures.
  • While not replacing traditional interpretation, sonification aids in preliminary EEG triage.