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Related Concept Videos

Sound as Pressure Waves01:17

Sound as Pressure Waves

Sound waves, which are longitudinal waves, can be modeled as the displacement amplitude varying as a function of the spatial and temporal coordinates. As a column of the medium is displaced, its successive columns are also displaced. As the successive displacements differ relatively, a pressure difference with the surrounding pressure is created. The gauge pressure varies across the medium.
The pressure fluctuation depends on the difference in displacements between the successive points in the...
Pressure Variation in a Fluid at Rest01:11

Pressure Variation in a Fluid at Rest

In a fluid at rest, the pressure at any point beneath the fluid surface depends solely on the depth, not on the container's shape or size. This principle, known as hydrostatic pressure, arises because, in stationary fluids, there is no acceleration, meaning the forces within the fluid balance out. Only vertical forces, caused by the weight of the fluid above, contribute to pressure changes with depth.
When measuring pressure at two different levels within the fluid, the difference in pressure...
Pressure Relationships in Thoracic Cavity01:24

Pressure Relationships in Thoracic Cavity

Breathing, otherwise known as pulmonary ventilation, is the process of air movement into and out of the lungs. The main mechanisms propelling pulmonary ventilation are atmospheric pressure (Patm), intra-pulmonary (Ppul ) or intra-alveolar pressure (Palv) within the alveoli, and intrapleural pressure (Pip) within the pleural cavity.
Breathing Mechanisms
Both intra-alveolar and intrapleural pressures rely on specific lung properties. The ability to breathe—allowing air to enter the lungs during...
Fluid Pressure01:14

Fluid Pressure

In mechanical engineering, fluid pressure plays a critical role in designing systems that utilize liquid flow, such as hydraulic systems, pumps, and valves. When designing these systems, engineers must ensure they can withstand the forces created by fluid pressure to avoid damage or failure.
According to Pascal's law, a fluid at rest will generate equal pressure in all directions. This pressure is measured as a force per unit area, and its magnitude depends on the fluid's specific weight or...
Variation of Atmospheric Pressure01:18

Variation of Atmospheric Pressure

Change in atmospheric pressure with height is particularly interesting. The decrease in atmospheric pressure with increasing altitude is due to the decreasing gravitational force per unit area as we move away from the surface of the earth.
Assuming the air temperature is constant at a given altitude and that the ideal gas law of thermodynamics describes the atmosphere to a good approximation, one can find the variation of atmospheric pressure with height.
Let p(y) be the atmospheric pressure at...
Concept of Pressure at a Point01:15

Concept of Pressure at a Point

The concept of pressure at a point in a fluid establishes that pressure within a fluid is uniform in all directions at a specific location. This uniformity occurs because fluid molecules exert force evenly across any point due to their random motion and continuous collisions within the fluid. Pressure at a point is determined by the surrounding fluid molecules and is influenced by factors like depth and density, rather than by shape or orientation.
In a fluid at rest, pressure acts equally in...

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Related Experiment Video

Updated: Jul 5, 2026

Fabrication of Compressed Hosiery and Measurement of its Pressure Characteristic Exerted on the Lower Limbs
08:39

Fabrication of Compressed Hosiery and Measurement of its Pressure Characteristic Exerted on the Lower Limbs

Published on: May 27, 2020

Variability of pressure provided by sustained compression.

Christine Moffatt1

  • 1Centre for Research and Implementation of Clinical Practice, Wolfson Institute of Health Sciences, Thames Valley University, London, UK. christine.moffatt@tvu.ac.uk

International Wound Journal
|May 23, 2008
PubMed
Summary
This summary is machine-generated.

Delivering effective compression therapy for venous leg ulcers (VLUs) is challenging due to leg shape, bandaging skill, and system properties. Understanding these factors improves patient outcomes and treatment consistency.

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Area of Science:

  • Vascular Medicine
  • Dermatology
  • Biomedical Engineering

Background:

  • Compression therapy is essential for treating venous leg ulcers (VLUs).
  • Achieving optimal therapeutic outcomes depends on the quality of compression therapy applied.
  • Healthcare professionals face challenges in delivering precise and sustained compression.

Purpose of the Study:

  • To identify factors influencing the quality of compression therapy for VLUs.
  • To highlight the challenges in achieving graduated compression, especially with distorted leg shapes.
  • To emphasize the need for healthcare professionals to understand compression system properties and application techniques.

Main Methods:

  • Analysis of factors affecting compression therapy quality, including physical structure, elastomeric properties, leg morphology, bandaging skill, and patient activity.
  • Discussion of graduated compression principles and challenges in application.
  • Review of the impact of bandaging technique and patient tolerance on effectiveness.
  • Examination of sub-bandage pressure variations during patient activity and their relation to system properties.

Main Results:

  • Compression therapy quality is influenced by the compression system's properties, leg shape, bandaging technique, and patient activity.
  • Distorted leg shapes in VLU patients complicate the delivery of a desired pressure gradient.
  • Poor bandaging can lead to ineffective treatment or detrimental high pressures, affecting patient concordance.
  • Sub-bandage pressure increases with standing and walking, linked to the elastomeric properties of compression systems.
  • Training can reduce variability in sub-bandage pressure.

Conclusions:

  • Healthcare professionals must understand compression system properties and adjust application techniques accordingly.
  • Addressing challenges in VLU compression therapy requires a comprehensive approach considering multiple influencing factors.
  • Improved understanding and training are crucial for optimizing compression therapy and patient outcomes in VLUs.