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Related Concept Videos

Gross Anatomy of the Lungs01:17

Gross Anatomy of the Lungs

The lungs are a pair of vital organs connected to the trachea via the left and right bronchi. The base of these organs meets the dome-shaped muscle known as the diaphragm. Encased by the pleurae, the lungs contact the mediastinum. The right lung is shorter yet wider, and has a larger volume than the left lung. The left lung has an indentation known as the cardiac notch. The superior region of the lungs is referred to as the apex, whereas the base is the lower region near the diaphragm. The...
Lung Capacity01:47

Lung Capacity

The air in the lungs is measured in volumes and capacities. Lung volume measures reflect the amount of air taken in, released, or left over after a lung function, like a single inhalation. Lung capacity measures are sums of two or more lung volume measures.
Anatomy of Respiratory System II: Lower Respiratory Tract01:31

Anatomy of Respiratory System II: Lower Respiratory Tract

The lower respiratory tract is anatomically composed of several vital structures, including the larynx, trachea, bronchial tree, alveoli, lungs, and pleurae. Each component has a specific function, and all are intricately connected to ensure efficient respiration.
The Larynx
It is located between the pharynx and the trachea, acts as a passageway for air, and hosts several critical structures, such as the epiglottis, vocal cords, and glottis. The epiglottis acts as a gateway, guiding food to the...
Pulmonary Function Tests01:25

Pulmonary Function Tests

Pulmonary Function Tests (PFTs)
Pulmonary Function Tests are crucial diagnostic tools for assessing respiratory function, particularly in patients with chronic respiratory disorders. They comprehensively evaluate lung volumes, ventilatory function, breathing mechanics, diffusion, and gas exchange. These tests help diagnose pulmonary diseases and play a significant role in monitoring disease progression, evaluating disability, and assessing response to therapy.
PFTs involve using a spirometer, a...
Pleura of the Lungs01:13

Pleura of the Lungs

The lungs are nestled in a cavity, shielded by the pleura. The pleura, a form of serous membrane, wraps around each lung. This membrane arrangement consists of two layers: the visceral and parietal pleurae. The visceral pleura lines the surface of the lungIn contrast, the parietal pleura is the outer layer and contacts to the thoracic wall, the mediastinum, and the diaphragm. The hilum is the point of connection between the visceral and parietal layers. The space between the parietal and...
The Respiratory System01:16

The Respiratory System

The respiratory system is comprised of the organs that enable breathing. Air enters the nostrils and mouth, followed by the pharynx (throat) and larynx (voice box), which lead to the trachea (windpipe). In the thoracic cavity, the trachea splits into two bronchi that allow air to enter the lungs. The bronchi split into progressively smaller bronchioles and terminate in small groups of tiny sacs in the lungs called alveoli, where gas exchange occurs.

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Related Experiment Video

Updated: Jun 20, 2026

Point-of-Care Lung Ultrasound in Adults: Image Acquisition
09:17

Point-of-Care Lung Ultrasound in Adults: Image Acquisition

Published on: March 3, 2023

[Lung function].

S Sorichter1

  • 1Abteilung Pneumologie, Universitätsklinikum Freiburg, Killianstr. 5, 79106 Freiburg. stephan.sorichter@uniklinik-freiburg.de

Der Radiologe
|August 21, 2009
PubMed
Summary
This summary is machine-generated.

Comprehensive lung function testing, including spirometry and body plethysmography, aids in diagnosing ventilatory defects. Advanced methods like CO transfer factor and blood gas analysis refine diagnosis and treatment strategies for lung disorders.

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Area of Science:

  • Pulmonary Medicine
  • Respiratory Physiology

Background:

  • Lung function assessment traditionally focuses on spirometry (volume-time curves).
  • Broader lung function evaluation encompasses lung volumes, airway resistance, and gas exchange.
  • Accurate diagnosis of respiratory conditions requires a comprehensive approach beyond basic spirometry.

Purpose of the Study:

  • To outline a comprehensive approach to lung function testing.
  • To highlight the diagnostic utility of various pulmonary function tests (PFTs).
  • To emphasize the role of PFTs in classifying and managing ventilatory disorders.

Main Methods:

  • Spirometry for lung volumes and flow-volume curves.
  • Body plethysmography for residual volume, FRC, TLC, and airway resistance.
  • CO single breath transfer factor (T(LCO)) with He dilution for ventilated lung volume.
  • Inspiratory mouth pressures (PI(max), P(0.1)) for respiratory muscle strength.
  • Arterial blood gases (rest and exercise) and ergospirometry for ventilation-perfusion assessment.

Main Results:

  • Body plethysmography enables precise measurement of lung volumes and airway resistance.
  • T(LCO) combined with He dilution differentiates obstructive, restrictive, and mixed ventilatory defects, including trapped air.
  • Reversibility, provocation tests, and inspiratory pressures aid in disorder classification and treatment planning.
  • Arterial blood gases and ergospirometry provide further diagnostic insights into ventilation, diffusion, and perfusion.

Conclusions:

  • A multi-faceted approach to lung function testing is crucial for accurate diagnosis.
  • Integrating spirometry, plethysmography, gas exchange, and blood gas analysis enhances diagnostic capabilities.
  • Comprehensive PFTs are essential for effective management and treatment strategy development in respiratory diseases.