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Related Concept Videos

Hypoxia01:23

Hypoxia

Hypoxia is a medical condition characterized by an inadequate oxygen supply to body tissues. It typically manifests as a bluish discoloration of the skin and mucosae, especially in fair-skinned individuals, when hemoglobin (Hb) saturation drops below 75%.
Types of Hypoxia
There are four primary types of hypoxia, each resulting from a different cause:
1. Anemic hypoxia: This type occurs due to insufficient oxygen delivery caused by a lack of red blood cells (RBCs) or RBCs with abnormal or...
Acute Respiratory Failure-II01:21

Acute Respiratory Failure-II

Type I Respiratory Failure, or hypoxemic respiratory failure, occurs when the partial pressure of oxygen (PaO2) in arterial blood falls below 60 mmHg while breathing room air without a corresponding increase in arterial carbon dioxide levels (PaCO2). This condition highlights a significant impairment in the lungs' capacity to oxygenate the blood.
The underlying physiological abnormalities that contribute to hypoxemic respiratory failure include:
Assessment of Diffusion and Perfusion01:17

Assessment of Diffusion and Perfusion

Understanding and evaluating diffusion and perfusion is critical in assessing a patient's respiratory and circulatory health. These processes play key roles in maintaining the body's internal environment, ensuring that tissues receive adequate oxygen while waste products are efficiently removed.
The Role of Diffusion in Respiration
Diffusion is the process by which molecules move from an area of higher concentration to an area of lower concentration. In the respiratory system, this principle...
External and Internal Respiration01:24

External and Internal Respiration

External respiration occurs in the lungs, and it is the first step in the journey of oxygen inside the body. When we inhale, oxygen enters our lungs and diffuses across the thin alveolar membrane. The alveoli are tiny, air-filled sacs that provide a vast surface area for gas exchange. Oxygen in the alveoli has a higher partial pressure (105 mmHg) than in the adjacent pulmonary capillaries (40 mmHg), establishing a pressure gradient. As a result, oxygen molecules move from the alveoli into the...
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...
Chronic Obstructive Pulmonary Disease-IV: Assessement and Diagnostic Studies01:27

Chronic Obstructive Pulmonary Disease-IV: Assessement and Diagnostic Studies

Assessing and diagnosing Chronic Obstructive Pulmonary Disease (COPD) involves a detailed approach that includes a comprehensive review of medical history, physical examination, and a variety of diagnostic tests. This thorough evaluation is essential to ensure an accurate diagnosis and guide effective management strategies.
Medical History

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Related Experiment Video

Updated: Jun 3, 2026

Dual Test Gas Pulmonary Diffusing Capacity Measurement During Exercise in Humans Using the Single-Breath Method
08:44

Dual Test Gas Pulmonary Diffusing Capacity Measurement During Exercise in Humans Using the Single-Breath Method

Published on: February 2, 2024

Conditions associated with severe carbon monoxide diffusion coefficient reduction.

Lize Kiakouama1, Vincent Cottin, Jean-Charles Glerant

  • 1Hôpital Louis Pradel, Service de Pneumologie - Centre de Référence des Maladies Rares Pulmonaires, France. kiaslili@yahoo.fr

Respiratory Medicine
|April 2, 2011
PubMed
Summary
This summary is machine-generated.

Severe reduction in carbon monoxide transfer coefficient (Kco) often indicates pulmonary hypertension, particularly with emphysema or interstitial lung disease. Echocardiography is recommended for patients with significantly low Kco.

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Phenotyping Mouse Pulmonary Function In Vivo with the Lung Diffusing Capacity
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Phenotyping Mouse Pulmonary Function In Vivo with the Lung Diffusing Capacity

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Last Updated: Jun 3, 2026

Dual Test Gas Pulmonary Diffusing Capacity Measurement During Exercise in Humans Using the Single-Breath Method
08:44

Dual Test Gas Pulmonary Diffusing Capacity Measurement During Exercise in Humans Using the Single-Breath Method

Published on: February 2, 2024

Phenotyping Mouse Pulmonary Function In Vivo with the Lung Diffusing Capacity
07:13

Phenotyping Mouse Pulmonary Function In Vivo with the Lung Diffusing Capacity

Published on: January 6, 2015

Area of Science:

  • Pulmonary Medicine
  • Cardiopulmonary Physiology

Background:

  • Reduced carbon monoxide transfer coefficient (Kco) is a key indicator of lung disease severity.
  • Identifying underlying conditions associated with severe Kco reduction is crucial for effective patient management.

Purpose of the Study:

  • To determine the prevalence and types of conditions linked to a severely reduced Kco (< 40% of predicted values).
  • To investigate the association between severe Kco reduction and pulmonary hypertension.

Main Methods:

  • Retrospective analysis of pulmonary function tests, including Kco measurements, from a university hospital over six years.
  • Inclusion criteria: patients with at least one Kco < 40% of predicted values, with detailed follow-up pulmonary function tests and clinical data.

Main Results:

  • Out of 9061 Kco measurements in 5576 patients, 195 (3.5%) had severe Kco reduction (mean 29 ± 9%).
  • Leading causes included emphysema (46%), interstitial lung disease (28%), combined pulmonary fibrosis and emphysema (16%), and pulmonary hypertension (8%).
  • Pulmonary hypertension was frequently observed, particularly in patients with emphysema, interstitial lung disease, and combined conditions, often disproportionate to parenchymal disease.

Conclusions:

  • Severe Kco reduction is strongly associated with pulmonary hypertension, especially in the presence of emphysema and/or interstitial lung disease.
  • Systematic echocardiography is advised for all patients presenting with significantly diminished Kco to screen for pulmonary hypertension.