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Mechanical Ventilation II: Invasive Ventilation01:23

Mechanical Ventilation II: Invasive Ventilation

Ventilators are essential medical equipment used to aid patients with respiratory difficulties. Their primary function is to assist or replace spontaneous breathing by providing mechanical ventilation. There are two general classes of mechanical ventilators: negative-pressure and positive-pressure ventilators.
Negative-Pressure Ventilators
Negative-pressure ventilators create a vacuum around the chest or body to draw air into the lungs, simulating breathing. This method does not require an...
Mechanical Ventilation I: Indication and Settings01:29

Mechanical Ventilation I: Indication and Settings

Mechanical ventilation is a life-saving technique for managing acute respiratory failure and other respiratory complications. The process involves using a machine known as a ventilator to supply oxygen to the lungs and assist in removing carbon dioxide. It serves as a bridge to long-term mechanical ventilation or a temporary measure until ventilatory support is discontinued. The ventilator can maintain this function for a prolonged period, providing critical support for patients until they can...
Ventilatory Modes01:14

Ventilatory Modes

Mechanical ventilators are life-saving devices that support or replace spontaneous breathing. They deliver breaths to patients through varying methods known as ventilator modes. Understanding these modes is critical for healthcare providers managing patients with respiratory failure.
There are three ventilatory modes: full support, partial support, and spontaneous. These are described below.
Full Support Modes
Full support modes include controlled mechanical ventilation, continuous mandatory...
Mechanical Ventilation III: Noninvasive Ventilation01:23

Mechanical Ventilation III: Noninvasive Ventilation

Noninvasive positive-pressure ventilation (NIPPV), continuous positive airway pressure (CPAP), and bilevel positive airway pressure (BiPAP) are essential methods in respiratory care. These ventilation techniques offer unique benefits for patients with various respiratory conditions, providing adequate support without requiring intubation. Let's explore how each method is crucial in improving patient outcomes and enhancing respiratory therapy.
Noninvasive Positive-Pressure Ventilation (NIPPV)
Alterations in Respiration II01:30

Alterations in Respiration II

There are numerous types of normal and abnormal respiration. Based on ventilatory movements, breathing patterns are classified as regular, deep, or shallow. Examples include Biot's breathing, Cheyne-Stokes respiration, Kussmaul's breathing, hyperventilation, and hypoventilation. Each pattern is clinically significant and aids in evaluating patients.
In Biot's breathing, the respiratory rate and depth are irregular, alternating between periods of deep gasping and apnea. Common causes include...
Atelectasis II: Pathophysiology01:10

Atelectasis II: Pathophysiology

Atelectasis develops when alveoli lose their air and collapse inward. Because lung tissue is naturally elastic, these air sacs shrink rather than remaining open. Collapsed alveoli are no longer ventilated, reducing their role in gas exchange. Blood flow may continue in these regions, creating a ventilation–perfusion mismatch. Clinical findings include decreased breath sounds, dullness to percussion, reduced chest expansion, and decreased tactile fremitus as sound transmission through collapsed...

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Related Experiment Video

Updated: Jun 17, 2026

3D Cine Magnetic Resonance Imaging of Respiratory Motion in Mechanically Ventilated Mice and Rats
08:22

3D Cine Magnetic Resonance Imaging of Respiratory Motion in Mechanically Ventilated Mice and Rats

Published on: September 19, 2025

Prolonged mechanical ventilation alters diaphragmatic structure and function.

Scott K Powers1, Andreas N Kavazis, Sanford Levine

  • 1Department of Applied Physiology and Kinesiology, University of Florida, Gainesville, FL, USA. spowers@hhp.ufl.edu

Critical Care Medicine
|January 5, 2010
PubMed
Summary

Prolonged mechanical ventilation causes diaphragmatic atrophy and dysfunction, beginning within 18 hours. Understanding the molecular mechanisms driving this weakness is crucial for developing future therapies to preserve diaphragm health.

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Area of Science:

  • Critical care medicine
  • Respiratory physiology
  • Muscle biology

Background:

  • Mechanical ventilation is essential for respiratory support but can negatively impact the diaphragm.
  • Diaphragmatic dysfunction is a significant concern in critically ill patients requiring prolonged ventilator support.

Purpose of the Study:

  • To synthesize current scientific understanding of how extended mechanical ventilation affects diaphragm function and biological processes.
  • To identify key molecular pathways involved in ventilator-induced diaphragmatic dysfunction.

Main Methods:

  • Systematic review of existing scientific literature.

Main Results:

  • Mechanical ventilation, even for as short as 18 hours, induces diaphragmatic atrophy and contractile dysfunction in animal models and humans.
  • Ventilator-induced diaphragmatic atrophy results from increased protein breakdown and reduced protein synthesis.
  • Key proteases like calpain, caspase-3, and the ubiquitin-proteasome system are implicated in muscle protein degradation.

Conclusions:

  • Prolonged mechanical ventilation leads to significant diaphragmatic atrophy and impaired function.
  • Identifying the signaling pathways that activate proteases and inhibit protein synthesis is a critical future research direction.
  • Future research into these mechanisms will inform the development of interventions to protect diaphragm mass and function during mechanical ventilation.