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Related Concept Videos

Ventilatory Modes01:14

Ventilatory Modes

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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...
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Mechanical Ventilation I: Indication and Settings01:29

Mechanical Ventilation I: Indication and Settings

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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...
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Mechanical Ventilation II: Invasive Ventilation01:23

Mechanical Ventilation II: Invasive Ventilation

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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...
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Mechanical Ventilation III: Noninvasive Ventilation01:23

Mechanical Ventilation III: Noninvasive Ventilation

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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...
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Pressure Relationships in Thoracic Cavity01:24

Pressure Relationships in Thoracic Cavity

3.0K
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...
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Factors Affecting Pulmonary Ventilation01:19

Factors Affecting Pulmonary Ventilation

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Besides the pressure difference between the external environment and the lungs, the airflow rate and ease of pulmonary ventilation are also influenced by three other factors: surface tension of the fluid in the alveoli, compliance of the lungs, and airway resistance.
Alveolar Surface Tension
The alveolar fluid lines the luminal surface of the alveoli and exerts a force called surface tension. This force is caused by the polar water molecules in the liquid being more strongly attracted to each...
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Related Experiment Video

Updated: Aug 31, 2025

Ex Vivo Porcine Experimental Model for Studying and Teaching Lung Mechanics
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Mechanical Power Differs Between Pressure-Controlled Ventilation and Different Volume-Controlled Ventilation Modes.

Petra J Rietveld1, Jacob W M Snoep1, Marjolein Lamping1

  • 1All authors: Department of Intensive Care, Leiden University Medical Centre, Leiden, The Netherlands.

Critical Care Explorations
|August 19, 2022
PubMed
Summary
This summary is machine-generated.

Volume-controlled ventilation without pause time delivered the least mechanical power (MP) to patients, while VCV with a 10% pause time delivered the most. These findings compare MP across different ventilation modes in critically ill patients.

Keywords:
mechanical powermechanical ventilationpressure-controlled ventilationstress and strain of the lungventilator-induced lung injuryvolume-controlled ventilation

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Area of Science:

  • Critical Care Medicine
  • Respiratory Physiology
  • Mechanical Ventilation

Background:

  • Mechanical power (MP) quantifies energy transfer from ventilators to patients.
  • Estimating MP differs between volume-controlled ventilation (VCV) and pressure-controlled ventilation (PCV) due to distinct pressure-volume loop characteristics.
  • Understanding MP variations across modes is crucial for optimizing ventilator settings.

Purpose of the Study:

  • To compare the mechanical power delivered by VCV with zero pause time (VCV-0), VCV with 10% pause time (VCV-10), and PCV.
  • To analyze these comparisons across patient categories stratified by lung injury severity.

Main Methods:

  • A proof-of-concept study included 46 mechanically ventilated patients without spontaneous breathing.
  • Measurements were performed in PCV mode initially, followed by VCV-0 and VCV-10, maintaining consistent tidal volume and settings.
  • Comparisons focused on the MP calculated from pressure-volume loops.

Main Results:

  • Mean MP values were 19.30 J/min for VCV-0, 21.80 J/min for VCV-10, and 20.87 J/min for PCV (p < 0.05 for all).
  • Transpulmonary MP values were 6.75 J/min for VCV-0, 8.60 J/min for VCV-10, and 7.99 J/min for PCV (p < 0.05 for all).

Conclusions:

  • In controlled ventilation modes, VCV-0 resulted in the lowest MP, followed by PCV.
  • VCV-10 demonstrated the highest MP among the tested modes.
  • Ventilator settings significantly influence the mechanical power delivered to patients.