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Pulmonary Cycle: Exhalation01:17

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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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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.
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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.
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A pneumothorax is a condition where air builds up in the space between the lung and the chest wall, causing the lung to collapse. This condition arises when air enters the space between the parietal and visceral pleura, disrupting the negative pressure essential for lung inflation. This can lead to a partial or complete collapse of the lung.
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Pulmonary embolism (PE) occurs when a thrombus, fat or air embolus, amniotic fluid, or tumor tissue blocks one or more pulmonary arteries. These blockages originate in the venous system or the right side of the heart.EtiologyPE primarily arises from deep vein thrombosis (DVT) and other hypercoagulable states, such as inherited thrombophilias. Additional etiological factors include venous stasis, commonly seen in obesity, and endothelial injury from surgery and trauma. Less common causes include...
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Pneumothorax is a medical condition defined by the buildup of air in the pleural space between the lungs and the chest wall. This accumulation of air can lead to partial or complete lung collapse, resulting in a range of clinical manifestations. Understanding the clinical presentation and effective management strategies is crucial for healthcare professionals in providing timely and appropriate care to individuals with pneumothorax.
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Normothermic Negative Pressure Ventilation Ex Situ Lung Perfusion: Evaluation of Lung Function and Metabolism
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Negative-Pressure Pulmonary Edema.

Mallar Bhattacharya1, Richard H Kallet1, Lorraine B Ware2

  • 1Departments of Medicine, Anesthesia, and Respiratory Care, University of California, San Francisco, San Francisco, CA.

Chest
|April 12, 2016
PubMed
Summary
This summary is machine-generated.

Negative-pressure pulmonary edema (NPPE) is acute respiratory failure caused by intense airway pressure. Treatment involves relieving obstruction and supportive ventilation for rapid recovery.

Keywords:
acute lung injurypulmonary edema

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Area of Science:

  • Medicine
  • Pulmonology
  • Critical Care

Background:

  • Negative-pressure pulmonary edema (NPPE), also known as postobstructive pulmonary edema, is a recognized cause of acute respiratory failure.
  • It arises from strenuous inspiratory efforts against an obstructed airway, commonly due to infections, tumors, or laryngospasm.

Purpose of the Study:

  • To review the clinical presentation, pathophysiology, and management of NPPE.
  • To elucidate the mechanisms driving NPPE and outline effective therapeutic strategies.

Main Methods:

  • This is a review article, synthesizing existing literature on NPPE.
  • Key aspects discussed include the generation of negative intrathoracic pressures and their impact on fluid dynamics.

Main Results:

  • Intense negative airway pressures significantly increase transvascular fluid filtration, leading to interstitial and alveolar edema.
  • Pulmonary edema fluid in NPPE typically shows low protein concentration, indicating hydrostatic forces as the primary driver.
  • Alveolar fluid clearance mechanisms remain functional, contributing to rapid edema resolution.

Conclusions:

  • NPPE is a distinct syndrome of acute respiratory failure.
  • Management focuses on immediate airway obstruction relief, lung-protective ventilation, and diuresis when appropriate.
  • Prompt intervention facilitates rapid resolution of pulmonary edema.