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Related Concept Videos

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...
Acute Respiratory Failure-III01:30

Acute Respiratory Failure-III

Hypercapnic respiratory failure, also known as Type 2 or ventilatory respiratory failure, is a severe condition characterized by the body's inability to effectively remove carbon dioxide (CO2) from the bloodstream. It leads to an arterial CO2 pressure (PaCO2) exceeding 45 mmHg and a blood pH above 7.35. This situation indicates that the body's ventilatory demand, or the ventilation needed to maintain normal PaCO2 levels, surpasses its supply or the maximum gas flow achievable without causing...
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...
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...
Acute Respiratory Failure-II01:21

Acute Respiratory Failure-II

Type I Respiratory Failure, or hypoxemic respiratory failure, occurs when the partial pressure of oxygen (PaO2) in arterial blood falls below 60 mmHg while breathing room air without a corresponding increase in arterial carbon dioxide levels (PaCO2). This condition highlights a significant impairment in the lungs' capacity to oxygenate the blood.
The underlying physiological abnormalities that contribute to hypoxemic respiratory failure include:
Pulmonary Cycle: Exhalation01:17

Pulmonary Cycle: Exhalation

In terms of human respiration, the act of expelling air, known as exhalation (or expiration), operates on the principle of pressure gradients. During expiration, the pressure within the lungs exceeds that of the surrounding atmosphere. Under normal conditions, quiet breathing involves passive exhalation and is free of muscular contractions. This is because the exhalation process is driven by the natural elastic recoil of the lungs and chest wall, both of which have an inherent tendency to...

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Updated: May 9, 2026

Measuring Diaphragm Thickness and Function Using Point-of-Care Ultrasound
05:51

Measuring Diaphragm Thickness and Function Using Point-of-Care Ultrasound

Published on: November 3, 2023

Ventilator-induced diaphragm dysfunction: cause and effect.

Scott K Powers1, Michael P Wiggs, Kurt J Sollanek

  • 1Department of Applied Physiology and Kinesiology, University of Florida, Gainesville, Florida 32611, USA. spowers@hhp.ufl.edu

American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
|July 12, 2013
PubMed
Summary
This summary is machine-generated.

Mechanical ventilation (MV) can cause ventilator-induced diaphragm dysfunction (VIDD) in just 18–24 hours. Understanding VIDD’s molecular mechanisms is key to preventing diaphragm atrophy and improving patient weaning outcomes.

Keywords:
atrophymechanical ventilationmuscle wastingrespiratory muscleweaning

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Area of Science:

  • Critical Care Medicine
  • Respiratory Physiology
  • Molecular Biology

Background:

  • Mechanical ventilation (MV) is crucial for patients needing respiratory support.
  • Prolonged MV can lead to ventilator-induced diaphragm dysfunction (VIDD), causing atrophy and contractile issues.
  • VIDD complicates ventilator weaning, increasing morbidity, mortality, and healthcare costs.

Purpose of the Study:

  • To summarize the current understanding of ventilator-induced diaphragm dysfunction (VIDD).
  • To highlight the rapid onset and molecular mechanisms of VIDD.
  • To identify future research directions for preventing VIDD.

Main Methods:

  • Review of existing research on mechanical ventilation and diaphragm function.
  • Analysis of studies investigating protein breakdown and synthesis in the diaphragm during MV.
  • Identification of key proteases and signaling pathways implicated in VIDD.

Main Results:

  • VIDD can develop within 18–24 hours of MV initiation in animal models and humans.
  • MV-induced diaphragmatic atrophy results from increased protein breakdown and decreased synthesis.
  • Proteases like calpain, caspase-3, and systems including autophagy and ubiquitin-proteasome are involved in diaphragmatic proteolysis.

Conclusions:

  • VIDD is a significant complication of mechanical ventilation, occurring rapidly.
  • Understanding the molecular signaling pathways driving VIDD is essential.
  • Future research focusing on these pathways may lead to pharmacological interventions to prevent VIDD and facilitate ventilator weaning.