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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...
Pressure Relationships in Thoracic Cavity01:24

Pressure Relationships in Thoracic Cavity

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 during...
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...
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...
Breathing01:05

Breathing

The process of breathing, inhaling and exhaling, involves the coordinated movement of the chest wall, the lungs, and the muscles that move them. Two muscle groups with important roles in breathing are the diaphragm, located directly below the lungs, and the intercostal muscles, which lie between the ribs. When the diaphragm contracts, it moves downward, increasing the volume of the thoracic cavity and creating more room for the lungs to expand. When the intercostal muscles contract, the ribs...
Pulmonary Ventilation: Inhalation01:24

Pulmonary Ventilation: Inhalation

Pulmonary ventilation is a vital process that ensures the exchange of oxygen and carbon dioxide in the lungs. It refers to the movement of air into and out of the lungs, enabling the body to obtain oxygen and remove waste carbon dioxide. In this article, we will explore the intricacies of pulmonary ventilation, including its underlying principles, mechanisms, and the interplay of pressures within the respiratory system.
Boyle's law becomes particularly pertinent when examining respiratory...

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Rapid Viscoelastic Characterization of Airway Mucus Using a Benchtop Rheometer
08:47

Rapid Viscoelastic Characterization of Airway Mucus Using a Benchtop Rheometer

Published on: April 21, 2022

Ventilation patterns influence airway secretion movement.

Marcia S Volpe1, Alexander B Adams, Marcelo B P Amato

  • 1Respiratory Intensive Care Unit, University of São Paulo School of Medicine, Brazil.

Respiratory Care
|September 25, 2008
PubMed
Summary
This summary is machine-generated.

Mechanical ventilation settings can impact airway secretion movement. Flow bias and lung impedance influence whether mucus is cleared or retained in the lungs, affecting patient outcomes.

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Area of Science:

  • Biomedical Engineering
  • Respiratory Physiology

Background:

  • Airway secretion retention is a significant challenge for patients on mechanical ventilation.
  • Current methods for managing secretions offer only short-term benefits.

Purpose of the Study:

  • To investigate how ventilator settings and lung impedance affect the retention and expulsion of airway secretions.
  • To understand the mechanisms of mucus movement within the airways during mechanical ventilation.

Main Methods:

  • Laboratory experiments using a test-lung system with a mucus simulant.
  • Varying ventilator parameters such as flow rates, pressure, and waveforms.
  • Measuring mucus simulant movement using photodensitometry and image analysis.

Main Results:

  • Ventilator settings creating expiratory flow bias with intrinsic positive end-expiratory pressure (PEEP) promoted mucus clearance.
  • Intrinsic PEEP from increased airway resistance led to mucus retention.
  • Rapid mucus transfer occurred between lungs with differing compliances, favoring movement from low to high compliance.

Conclusions:

  • Ventilation patterns and lung impedance critically influence mucus movement during mechanical ventilation.
  • Adjusting ventilator settings to create specific flow biases may be a strategy to manage airway secretions.