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Related Concept Videos

Imaging Studies I: CT and MRI01:14

Imaging Studies I: CT and MRI

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Introduction: MRI and CT scans are crucial advancements in medical imaging techniques, playing a vital role in diagnosing conditions related to the gastrointestinal (GI) system. Each scan serves distinct purposes, targets specific areas, and requires unique nursing duties.
Description of the Procedures
Computed Tomography (CT) scan:
Computed Tomography (CT) scans use X-ray technology to generate detailed images of bones, organs, and tissues. During the scan, the patient lies on a moving table...
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Plastic Deformations01:19

Plastic Deformations

470
Plastic deformation represents a fundamental concept in materials science, which explains the irreversible change in the shape of a material when it experiences stress beyond its elastic capability. This phenomenon is important in structural engineering, especially in designing and analyzing cantilever beams—structures that are securely fixed at one end and bear loads at the opposite end. When these beams are subjected to loads within their elastic range, they will return to their...
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Plastic Deformations01:14

Plastic Deformations

455
It is essential to understand how structural members behave under plastic deformation when the bending stress exceeds the material's yield strength. This state of deformation permanently alters the shape of the member, in contrast to the linear elastic behavior observed before yielding. The strain at any point in the member is expressed in terms of maximum strain. Notably, the neutral axis, which coincides with the centroid during elastic bending, shifts away from the centroid under plastic...
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Temperature Dependent Deformation01:12

Temperature Dependent Deformation

408
In a nonhomogeneous rod made up of steel and brass, restrained at both ends and subjected to a temperature change, several steps are involved in calculating the stress and compressive load. Due to the problem's static indeterminacy, one end support is disconnected, allowing the rod to experience the temperature change freely. Next, an unknown force is applied at the free end, triggering deformations in the rod's steel and brass portions. These deformations are then calculated and added...
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Deformations in a Symmetric Member in Bending01:18

Deformations in a Symmetric Member in Bending

521
When analyzing the deformation of a symmetric prismatic member subjected to bending by equal and opposite couples, it becomes clear that as the member bends, the originally straight lines on its wider faces curve into circular arcs, with a constant radius centered at a point known as Point C. This phenomenon helps to understand the stress and strain distribution within the member more clearly.
When the member is segmented into tiny cubic elements, it is observed that the primary stress...
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Deformation of Member under Multiple Loadings01:11

Deformation of Member under Multiple Loadings

484
When a rod is made of different materials or has various cross-sections, it must be divided into parts that meet the necessary conditions for determining the deformation. These parts are each characterized by their internal force, cross-sectional area, length, and modulus of elasticity. These parameters are then used to compute the deformation of the entire rod.
In the case of a member with a variable cross-section, the strain is not constant but depends on the position. The deformation of an...
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Sacral Soft Tissue Deformations When Using a Prophylactic Multilayer Dressing and Positioning System: MRI Studies.

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    Summary
    This summary is machine-generated.

    Preventive devices significantly reduce tissue deformation in the sacral area, lowering the risk of pressure injuries (PIs) for bedridden patients. Combined interventions offer the most protection against sacral PI development.

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    Area of Science:

    • Biomedical Engineering
    • Clinical Nursing
    • Medical Imaging

    Background:

    • Sacral pressure injuries (PIs) are common in bedridden individuals.
    • Understanding tissue deformation is crucial for preventing PIs.

    Purpose of the Study:

    • To quantify the impact of pressure-preventive devices on sacral tissue deformation.
    • To evaluate effects on skeletal muscle, subcutaneous fat, and skin.

    Main Methods:

    • Used magnetic resonance imaging (MRI) to measure tissue thickness changes in 3 healthy adults.
    • Compared tissue deformation on a rigid surface, foam mattress, with dressing, and with dressing and positioning system.
    • Employed descriptive, comparative design with ANOVA and Tukey-Kramer tests.

    Main Results:

    • Combined interventions (mattress, dressing, positioning system) significantly reduced soft tissue deformation compared to a rigid surface (P < .05).
    • All tested devices individually and in combination showed reduced deformation levels.
    • Significant reductions observed in skin, subcutaneous fat, and muscle tissue deformation.

    Conclusions:

    • A combination of preventive measures effectively reduces sacral tissue deformation.
    • Findings suggest that multi-component pressure injury prevention strategies are beneficial.
    • This approach may lower the incidence of sacral pressure injuries.