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Related Concept Videos

Heart Sounds01:15

Heart Sounds

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) valves at the...
Sound Waves: Interference00:53

Sound Waves: Interference

Sound waves can be modeled either as longitudinal waves, wherein the molecules of the medium oscillate around an equilibrium position, or as pressure waves. When two identical waves from the same source superimpose on each other, the combination of two crests or two troughs results in amplitude reinforcement known as constructive interference. If two identical waves, that are initially in phase, become out of phase because of different path lengths, the combination of crests with troughs...
Cardiovascular System Abnormal Findings II: Auscultation01:25

Cardiovascular System Abnormal Findings II: Auscultation

Auscultation, an essential part of a heart examination, is done using a stethoscope. It provides crucial information about heart function and possible heart problems. Due to heart problems, abnormal sounds can be heard during systole or diastole. These sounds include S3 and S4 gallops, opening snaps, systolic clicks, and murmurs.
Abnormal Heart Sounds
Gallops:
Physical Assessment of the Respiratory Tract IV: Auscultation01:28

Physical Assessment of the Respiratory Tract IV: Auscultation

Auscultation is a crucial component of the physical assessment of the respiratory tract. It offers valuable insights into airflow through the bronchial tree and potential lung obstructions. This process involves careful listening to breath, voice, and adventitious sounds, which can reveal a wealth of information about a patient's respiratory health.
Breath Sounds
Breath sounds are categorized into vesicular, bronchovesicular, and bronchial.
Assessment of the Cardiovascular System IV: Auscultation01:25

Assessment of the Cardiovascular System IV: Auscultation

Cardiac auscultation is a clinical skill used to assess heart function and detect abnormalities. It involves listening to heart sounds at specific anatomical locations through a stethoscope.
Normal Heart Sounds
S1 (First Heart Sound)-
S1 is made by the closure of the mitral and tricuspid valves (atrioventricular valves), marking the beginning of systole.
S2 (Second Heart Sound)-
S2 is made by the closure of the aortic and pulmonic valves (semilunar valves), marking the end of the systole.
Assessment of Respiration01:23

Assessment of Respiration

The respiratory system's basic structures and primary functions lay the foundation for nurses' comprehensive respiratory assessments. This assessment includes subjective and objective data to gauge the patient's respiratory health.
Subjective Assessment: Nurses interview the patient to gather information directly during the subjective assessment. It includes questions about the individual's medical history, medications, and symptoms, focusing on past respiratory conditions like asthma or COPD,...

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Related Experiment Video

Updated: Jul 10, 2026

Point-of-Care Lung Ultrasound in Adults: Image Acquisition
09:17

Point-of-Care Lung Ultrasound in Adults: Image Acquisition

Published on: March 3, 2023

Heart sounds interference cancellation in lung sounds.

S Charleston-Villalobos1, L F Dominguez-Robert, R Gonzalez-Camarena

  • 1Electr. Eng. Dept., Univ. Autonoma Metropolitana-Iztapalapa, Mexico City, Mexico. schv@xanum.uam.mx

Conference Proceedings : ... Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual Conference
|October 20, 2007
PubMed
Summary

This study presents a novel method to remove heart sounds from lung sound recordings. This technique improves the accuracy of quantitative lung sound analysis for medical diagnosis.

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Protocol and Guidelines for Point-of-Care Lung Ultrasound in Diagnosing Neonatal Pulmonary Diseases Based on International Expert Consensus
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Protocol and Guidelines for Point-of-Care Lung Ultrasound in Diagnosing Neonatal Pulmonary Diseases Based on International Expert Consensus

Published on: March 6, 2019

Related Experiment Videos

Last Updated: Jul 10, 2026

Point-of-Care Lung Ultrasound in Adults: Image Acquisition
09:17

Point-of-Care Lung Ultrasound in Adults: Image Acquisition

Published on: March 3, 2023

Protocol and Guidelines for Point-of-Care Lung Ultrasound in Diagnosing Neonatal Pulmonary Diseases Based on International Expert Consensus
06:15

Protocol and Guidelines for Point-of-Care Lung Ultrasound in Diagnosing Neonatal Pulmonary Diseases Based on International Expert Consensus

Published on: March 6, 2019

Area of Science:

  • Medical Acoustics
  • Respiratory Physiology
  • Signal Processing

Background:

  • Quantitative analysis of lung sounds aids in understanding their origin and diagnosing pathologies.
  • Previous methods used non-simultaneous acquisition and lacked effective interference removal.
  • Heart sounds (HS) are significant interferences in lung sound (LS) acquisition.

Purpose of the Study:

  • To propose a novel Heart Sound (HS) cancellation scheme for quantitative lung sound analysis.
  • To improve the accuracy of lung sound feature extraction by removing confounding signals.
  • To enhance medical diagnosis through clearer lung sound data.

Main Methods:

  • Utilized Empirical Mode Decomposition (EMD) for signal analysis.
  • Implemented a combination of time warping and linear adaptive FIR filtering.
  • Evaluated the proposed HS cancellation scheme using simulated signals under controlled conditions.

Main Results:

  • The proposed scheme effectively cancels heart sound interference from lung sound signals.
  • Simulated data demonstrated the performance of the HS cancellation technique.
  • The method provides a foundation for more accurate quantitative lung sound analysis.

Conclusions:

  • The developed HS cancellation scheme is a viable extension for improving lung sound analysis.
  • Accurate lung sound analysis is crucial for reliable medical diagnosis of respiratory conditions.
  • Further research can build upon this method for real-world clinical applications.