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Related Concept Videos

Pneumothorax II: Pathophysiology01:08

Pneumothorax II: Pathophysiology

Pneumothorax means the presence of air in the pleural space — the thin potential gap between the visceral and parietal pleura. This condition disrupts the normal pressure balance that keeps the lungs inflated, leading to partial or complete collapse of the affected lung.Normal physiologyUnder normal conditions, the pleural space maintains a slightly negative intrapleural pressure, which keeps the lungs expanded against the chest wall. This negative pressure creates a delicate balance between...
Pneumothorax-I01:26

Pneumothorax-I

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.
Pneumothorax can be even further classified as spontaneous, traumatic, and tension pneumothorax.
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...
Pneumothorax-II01:27

Pneumothorax-II

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.
Clinical Manifestations:
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...
Respiratory System Abnormal Finding I: Inspection and Percussion01:30

Respiratory System Abnormal Finding I: Inspection and Percussion

Respiratory system abnormalities are a significant concern in healthcare due to their potential to indicate underlying severe conditions like Chronic Obstructive Pulmonary Disease (COPD), asthma, and pneumonia. These abnormalities can often be detected through physical examination methods like inspection and percussion.
Inspection Findings
During an inspection, several findings may suggest the presence of respiratory distress or disease. Pursed-lip breathing, where exhalation is slowed by...

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Related Experiment Video

Updated: Jun 23, 2026

Functional and Morphological Assessment of Diaphragm Innervation by Phrenic Motor Neurons
09:43

Functional and Morphological Assessment of Diaphragm Innervation by Phrenic Motor Neurons

Published on: May 25, 2015

Diaphragm paralysis.

Asher Qureshi1

  • 1Department of Medicine, St. Francis Hospital and Medical Center, Hartford, Connecticut 06105, USA. aqureshi@stfranciscare.org

Seminars in Respiratory and Critical Care Medicine
|May 20, 2009
PubMed
Summary
This summary is machine-generated.

Diaphragm paralysis, though underdiagnosed, causes breathing problems and affects lung function. Symptoms worsen when lying down, and diagnosis involves imaging and specific tests.

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Area of Science:

  • Pulmonology
  • Neurology

Background:

  • The diaphragm is crucial for breathing; its paralysis impairs ventilatory function.
  • Diaphragmatic paralysis can be unilateral or bilateral, with bilateral cases presenting more severe symptoms like dyspnea and ventilatory failure.
  • It is an underdiagnosed cause of respiratory distress, often presenting with a restrictive pattern on pulmonary function tests.

Purpose of the Study:

  • To review the clinical presentation, diagnostic methods, and management strategies for diaphragm paralysis.
  • To highlight the underdiagnosed nature of this condition and its impact on respiratory health.

Main Methods:

  • Review of clinical symptoms, pulmonary function tests, and diagnostic imaging (chest X-ray).
  • Confirmation through functional tests like the sniff test or electrophysiological studies (phrenic nerve stimulation/diaphragm EMG).

Main Results:

  • Symptoms, oxygenation, and vital capacity typically worsen in the supine position.
  • Unilateral paralysis often requires no treatment unless underlying lung disease is present.
  • Bilateral paralysis or ventilatory failure necessitates interventions like positive airway pressure, mechanical ventilation, or tracheostomy.

Conclusions:

  • Prognosis is generally good for unilateral diaphragm paralysis, particularly without comorbidities.
  • Prognosis is poorer for bilateral paralysis, especially with advanced lung disease or chronic demyelinating conditions.
  • Early diagnosis and appropriate management are key to improving outcomes in diaphragm paralysis.