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Related Concept Videos

Sites for measuring blood pressure01:21

Sites for measuring blood pressure

Blood pressure measurement is a fundamental clinical procedure, providing crucial data for assessing cardiovascular health. Among the various sites for this measurement, the brachial and popliteal arteries are predominantly utilized due to their accessibility and the reliability of their readings. This lesson delves into the anatomical significance, methodology, and considerations of measuring blood pressure at these locations.
The Brachial Artery: Primary Site for Blood Pressure Measurement
Equipments Used To Measure Blood Pressure01:30

Equipments Used To Measure Blood Pressure

Direct Method
This invasive approach involves cannulating a peripheral artery. During each cardiac contraction, pressure generates mechanical motion within the catheter, transmitted through rigid, fluid-filled tubing to a transducer. This transducer converts mechanical motion into electrical signals displayed as waveforms on a monitor. An automatic flushing system prevents blood backflow. Due to the potential risk of unexpected arterial blood loss, this method is primarily used in intensive...
Assessment of blood pressure in brachial artery(two-step method)01:23

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

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...
Measurement of Blood Pressure01:17

Measurement of Blood Pressure

Assessing blood pressure is a standard procedure executed in virtually all medical environments. The method utilized today was established over a hundred years ago by an innovative Russian doctor, Dr. Nikolai Korotkoff. The soft ticking noise, known as Korotkoff sounds, heard while taking blood pressure readings results from turbulent blood flow within the vessels. The apparatus required for this procedure includes a sphygmomanometer, a blood pressure cuff attached to a gauge, and a stethoscope.
Pressure Gauges01:20

Pressure Gauges

Most pressure gauges, like those on scuba tanks, are calibrated to read zero at atmospheric pressure. Readings from such gauges are called the gauge pressure, which is the pressure relative to atmospheric pressure. When the pressure inside the tank exceeds atmospheric pressure, the gauge reports a positive value. Some gauges are designed to measure negative pressure. For example, many physics experiments must take place in a vacuum chamber, a rigid chamber from which some of the air is pumped...
Measurement of Fluid Pressure01:16

Measurement of Fluid Pressure

Fluid pressure is commonly measured using devices called manometers, which rely on liquid columns to indicate pressure differences. The height of a liquid column in a manometer reflects the pressure exerted by the fluid, providing a simple yet effective means of measurement. Different types of manometers serve specific purposes based on their configurations and the type of fluids involved.
A basic form of manometer is the piezometer, a vertical tube open at the top and filled with the same...

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Related Experiment Video

Updated: Jun 26, 2026

A Protocol of Manual Tests to Measure Sensation and Pain in Humans
07:28

A Protocol of Manual Tests to Measure Sensation and Pain in Humans

Published on: December 19, 2016

Reliability and validity of a pressure algometer.

Ann M Kinser1, William A Sands, Michael H Stone

  • 1Performance Services, United States Olympic Training Center, Colorado Springs, Colorado, USA.

Journal of Strength and Conditioning Research
|January 9, 2009
PubMed
Summary
This summary is machine-generated.

This study validated an algometer for measuring pressure-pain thresholds. Results show high reliability and construct validity when the device is used with practice, correlating strongly with force plate measurements.

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Last Updated: Jun 26, 2026

A Protocol of Manual Tests to Measure Sensation and Pain in Humans
07:28

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Published on: December 19, 2016

Assessing Cerebral Autoregulation via Oscillatory Lower Body Negative Pressure and Projection Pursuit Regression
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Published on: December 10, 2014

Area of Science:

  • Biomedical Engineering
  • Pain Research
  • Biomechanics

Background:

  • Algometers measure pressure-pain thresholds.
  • Consistent force application is crucial for reliable pressure-pain threshold studies.
  • Previous algometer studies highlight the need for validated, reliable devices.

Purpose of the Study:

  • To assess the reliability and construct validity of a specific algometer.
  • To compare algometer force readings with a force plate.
  • To analyze the rate of force application during testing.

Main Methods:

  • An algometer (1000-Hz sampling rate) was used to apply manual pressure.
  • Force readings were compared against a force plate (500-Hz sampling rate).
  • Tests included repeated applications to 80 N and incremental forces from 20 to 110 N.

Main Results:

  • Excellent correlation (r = 0.990 to 0.999) between algometer and force plate readings.
  • Consistent force application rate observed (average slope 6.8 ± 0.932 N·s⁻¹).
  • Low standard error of estimate (SEE = 0.323 N).

Conclusions:

  • The algometer demonstrates high reliability and construct validity.
  • Familiarization and practice enhance the investigator's ability to apply force consistently.
  • The algometer is a valid tool for pressure-pain threshold research.