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Related Concept Videos

Factors Affecting Pulmonary Ventilation01:19

Factors Affecting Pulmonary Ventilation

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...
Assessment of Ventilation I: Respiratory Rate01:20

Assessment of Ventilation I: Respiratory Rate

Assessment of Ventilation
A Ventilation assessment is critical for monitoring a patient's health status. Respiration, one of the most accessible vital signs, provides insights into the function of numerous body systems and can indicate serious health issues, such as brainstem injuries from head trauma.
Critical Guidelines for Assessing Ventilation:
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...
Physiological Control of Respiration01:23

Physiological Control of Respiration

Introduction
Breathing, a seemingly passive process, is regulated by the respiratory center in the brainstem. This center coordinates the involuntary control of respirations, which means it occurs without conscious effort, ensuring a smooth and uninterrupted pattern.
Regulation of Ventilation
The body maintains ventilation by monitoring levels of carbon dioxide (CO2), oxygen (O2), and hydrogen ion concentration (pH) in the arterial blood. Among these factors, the level of CO2 plays a crucial...
Assessment of Ventilation II: Respiratory Depth and Rhythm01:29

Assessment of Ventilation II: Respiratory Depth and Rhythm

Respiratory Depth
Respiratory depth measures the volume of air inhaled or exhaled during a breath. It can vary from shallow to deep and typically remains consistent when a person is at rest or asleep. Occasionally, individuals will automatically inhale deeply, known as sighing, which inflates the lungs with more air than normal breathing.
To assess respiratory depth, observe the degree of chest excursion or movement:

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Related Experiment Video

Updated: Jun 14, 2026

Quantitative Mapping of Specific Ventilation in the Human Lung using Proton Magnetic Resonance Imaging and Oxygen as a Contrast Agent
08:26

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Published on: June 5, 2019

Can heterogeneity in ventilation be good?

Eduardo L V Costa1, Marcelo B P Amato

  • 1Research and Education Institute, Hospital Sírio Libanês, Rua Cel, Nicolau dos Santos, São Paulo, SP, Brazil. eduardoleitecosta@gmail.com

Critical Care (London, England)
|April 3, 2010
PubMed
Summary
This summary is machine-generated.

Selecting the best positive end-expiratory pressure (PEEP) is debated. Electrical impedance tomography may mislead in patients with normal lungs, despite its promise for lung injury.

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Last Updated: Jun 14, 2026

Quantitative Mapping of Specific Ventilation in the Human Lung using Proton Magnetic Resonance Imaging and Oxygen as a Contrast Agent
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Area of Science:

  • Critical care medicine
  • Respiratory physiology
  • Medical device technology

Background:

  • Optimal positive end-expiratory pressure (PEEP) selection is crucial for mechanical ventilation to prevent lung injury.
  • Current PEEP selection methods lack a universally accepted gold standard.
  • Electrical impedance tomography (EIT) offers a novel approach to assess ventilation distribution.

Discussion:

  • Zhao and colleagues utilized EIT to identify PEEP levels minimizing ventilation inhomogeneities.
  • EIT-based PEEP selection shows potential in scenarios with alveolar collapse and overdistension.
  • The study highlights a limitation of EIT in patients with healthy lungs, where it may provide misleading guidance.

Key Insights:

  • EIT can guide PEEP selection by visualizing lung ventilation patterns.
  • The efficacy of EIT for PEEP optimization is context-dependent, varying with lung condition.
  • Careful interpretation of EIT data is necessary, especially in mechanically ventilated patients with normal lung parenchyma.

Outlook:

  • Further research is needed to refine EIT applications for PEEP titration.
  • Developing EIT-based algorithms for diverse patient populations is a future direction.
  • Integrating EIT with other monitoring tools could enhance personalized mechanical ventilation strategies.