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Endoscopic Procedures II: Colonoscopy

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The colon, or large intestine, is the final segment of the digestive system. Its primary functions include absorbing water and vitamins produced by gut bacteria and transforming waste from liquid to solid to form stool. In adults, the large intestine is approximately 5 feet long and consists of four main sections:
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Imaging Studies III: Gastrointestinal Motility Studies and Virtual Colonoscopy01:26

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This lesson explores three gastrointestinal imaging techniques: radionuclide testing, colonic transit studies, and virtual colonoscopy.
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The principle of virtual work states that if a body is in static and dynamic equilibrium, then the sum of all the virtual work done by all external forces and couple moments for any given virtual displacement must be zero.
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Continuous Renal Replacement Therapy, also known as CRRT, is a procedural treatment for acute kidney injury (AKI) that gradually removes uremic toxins and fluids while maintaining acid-base balance and stabilizing electrolytes. It is particularly useful for hemodynamically unstable patients. Unlike intermittent hemodialysis, which is faster, CRRT provides a gentler approach over 24 hours, closely mimicking the function of natural kidneys. However, CRRT is not ideal for patients with...
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The principle of virtual work is an essential concept in the field of mechanics and engineering. This is used to solve problems related to the equilibrium of a structure or system. It is based on the assumption that if a system is in equilibrium, the work done by all the forces during a virtual displacement is zero. This principle is applied by considering virtual displacements of the system and the corresponding work done by internal and external forces.
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Virtual work is a powerful method used to solve problems involving several connected rigid bodies. When the system is in equilibrium, virtual work is zero. This allows the calculation of the resulting forces when a system undergoes a virtual displacement. When attempting to analyze such a system, first, use a free-body diagram, where an independent coordinate represents the configuration of the links, and mark its deflected position resulting from the positive virtual displacement.
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Updated: Feb 12, 2026

Fecal Microbiota Transplantation via Colonoscopy for Recurrent C. difficile Infection
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Is the Virtual Colonoscopy a Replacement for Optical Colonoscopy?

Andrew Guinigundo

    Seminars in Oncology Nursing
    |April 4, 2018
    PubMed
    Summary

    Computed tomography colonography, or virtual colonoscopy, offers an accurate and viable colon cancer screening option for patients unable or unwilling to undergo traditional colonoscopy.

    Area of Science:

    • Medical Imaging
    • Gastroenterology
    • Oncology

    Background:

    • Colon cancer screening is crucial for early detection and improved patient outcomes.
    • Traditional colonoscopy is the standard but may not be suitable for all patients.
    • Alternative screening methods are needed to increase participation in colon cancer detection.

    Purpose of the Study:

    • To evaluate the accuracy and viability of computed tomography colonography (CTC) as a colon cancer screening tool.
    • To assess CTC as an alternative for patients who cannot undergo or decline optical colonoscopy.

    Main Methods:

    • Review of clinical guidelines and published medical research on computed tomography colonography.
    • Analysis of studies assessing the diagnostic performance of virtual colonoscopy for colorectal neoplasia.
    Keywords:
    colon cancerpolypscreeningvirtual colonoscopy

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    Main Results:

    • Computed tomography colonography demonstrates accuracy comparable to traditional colonoscopy in detecting colorectal polyps and cancers.
    • Virtual colonoscopy is a viable option for individuals who are unwilling or unable to undergo optical colonoscopy.

    Conclusions:

    • Virtual colonoscopy is an accurate and viable screening tool for colon cancer under specific circumstances.
    • It provides an important alternative for expanding colon cancer screening participation.
    • Healthcare providers, including nurses, should be knowledgeable about CTC and counsel patients on its benefits and limitations.