Related Experiment Video
Updated: Aug 13, 2026

Expired CO2 Measurement in Intubated or Spontaneously Breathing Patients from the Emergency Department
Published on: January 29, 2011
Arterial carbon dioxide tension and dyspnea in chronic bronchitis and pulmonary emphysema
Abstract:
The severity of dyspnea (MRC scale) was confronted to the blood carbon dioxide tension (PaCO2) in 45 patients with chronic nonspecific lung disease having moderate or severe airway obstruction (FEV1.0 of less than 1.5 liters). The patients were classified as "bronchitic", "emphysematous" and "intermediate" using a 10- criterion (clinical, roentgenologic and biological) "emphysema score". No correlation between dyspnea grade and PaCO2 was found in "bronchitic" and "intermediate" patients; in the "emphysematous" subgroup PaCO2 tended to rise as dyspnea was more severe, but the linear correlation coefficient (r= +0.37) did not reach the significance threshold, which is high (0.468) for such a limited number of observations.
More Related Videos
07:09Assessment of Pulmonary Capillary Blood Volume, Membrane Diffusing Capacity, and Intrapulmonary Arteriovenous Anastomoses During Exercise
Published on: February 20, 2017
08:44Dual Test Gas Pulmonary Diffusing Capacity Measurement During Exercise in Humans Using the Single-Breath Method
Published on: February 2, 2024
Related Concept Videos
Chronic Obstructive Pulmonary Disease
Smoking is a primary risk factor for COPD, with over 80% of patients having a history of it. Patients typically experience progressive dyspnea or labored breathing, frequent coughing, and recurrent pulmonary infections. Many eventually succumb to respiratory failure, characterized by...
Acute Respiratory Failure-III
Chronic Obstructive Pulmonary Disease-IV: Assessement and Diagnostic Studies
Medical History
Chronic Obstructive Pulmonary Disease II: Emphysema
Chronic Obstructive Pulmonary Disease III: Chronic Bronchitis Features
Chronic Obstructive Pulmonary Disease IV: Clinical Manifestations