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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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Assessment of blood pressure in brachial artery(two-step method)01:23

Assessment of blood pressure in brachial artery(two-step method)

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Measuring blood pressure is a fundamental skill in healthcare that aids in diagnosing and monitoring hypertension and other cardiovascular conditions. An aneroid sphygmomanometer, commonly used in clinical settings, offers a manual and precise method for blood pressure measurement. The technique for using this instrument involves specific steps that must be carefully executed to ensure accuracy. The following detailed description outlines a two-step technique for assessing blood pressure using...
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Assessing Blood pressure using a doppler ultrasound01:19

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To obtain accurate blood pressure measurements in clinical settings, especially when traditional methods are insufficient, healthcare professionals utilize the Doppler ultrasound technique. This method uses high-frequency sound waves to detect blood flow within the arteries, which is crucial for patients with conditions that complicate circulatory system assessment.
Pre-Procedural Guidelines for Doppler Ultrasound Blood Pressure Assessment:
Preparation of Equipment:
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Related Experiment Video

Updated: Jun 11, 2025

Experimental Investigation of Secondary Flow Structures Downstream of a Model Type IV Stent Failure in a 180&#176; Curved Artery Test Section
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Denoising method for colonic pressure signals based on improved wavelet threshold.

Liu Cui1, Zhisen Si1, Kai Zhao2

  • 1Department of Computer Science and Information Engineering, Shanghai Institute of Technology, Shanghai 201418, People's Republic of China.

Biomedical Physics & Engineering Express
|October 1, 2024
PubMed
Summary
This summary is machine-generated.

This study introduces an improved wavelet denoising method to accurately analyze colonic peristaltic pressure signals. The new technique effectively filters noise, enhancing diagnosis of intestinal diseases.

Keywords:
colonic pressure signalshierarchical thresholdingthreshold functionwavelet denoising

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Area of Science:

  • Biomedical Engineering
  • Signal Processing

Background:

  • Colonic peristaltic pressure signals are crucial for diagnosing intestinal diseases.
  • Signal interference complicates accurate assessment of colonic peristalsis.

Purpose of the Study:

  • To develop an improved wavelet threshold denoising method for colonic peristaltic pressure signals.
  • To enhance the extraction of genuine signals and filter out noise.

Main Methods:

  • Proposed an improved wavelet threshold denoising algorithm based on discrete wavelet transform.
  • Constructed a flexible threshold function with three shape adjustment factors.
  • Designed a threshold calculation method considering different decomposition levels and hierarchical thresholding.

Main Results:

  • The method effectively denoises colonic pressure signals, improving signal extraction.
  • Experimental analysis confirmed reliability and stability with non-stationary signals.
  • Outperformed other methods in denoising and extracting colonic peristaltic pressure signals.

Conclusions:

  • The proposed method accurately extracts colonic peristaltic pressure signals by effectively filtering noise.
  • This technique aids in the improved identification and treatment of colonic peristalsis disorders.