bohr's method for measuring physiologic dead space

Monitoring carbon dioxide tension and arterial oxygen saturation using TOSCA monitoring in general respiratory ward Source: Annual Congress 2011 - Acute respiratory failure 38, 531sĬomparison between the transcutaneous carbon dioxide tension at the infraclavicular site with the arterial carbon dioxide tension 48, 524sĪrterial to end-tidal carbon dioxide measurements in neonates with respiratory disorders

Quantification of hypoventilation by carbon dioxide tension measurement during flexible bronchoscopy Source: International Congress 2017 – Discussion of techniques and technologies in lung function Related content which might interest you: A novel device for the measurement of carbon dioxide during tidal breathing in COPD It is concluded that the expired carbon dioxide versus tidal volume curve is a useful tool for research and clinical work, because it permits the noninvasive and accurate measurement of Bohr's dead space and mean alveolar carbon dioxide tension accurately during spontaneous breathing. It is shown that: 1) PA,CO2 is similar to Pa,CO2 in normal subjects, whilst it is significantly lower than Pa,CO2 in COPD patients 2) PA,CO2 is significantly higher than PET,CO2 in all subjects, especially in COPD patients 3) VD,Bohr/VT is increased in COPD patients as compared to normal subjects and 4) VD,Bohr/VT is lower than the ''physiological'' dead space ratio (VD,phys/VT) in COPD patients. This curve was analysed in 21 normal, healthy subjects and 35 chronic obstructive pulmonary disease (COPD) patients breathing tidally through a mouthpiece apparatus in the sitting position. The method used is a new, simple and noninvasive technique, based on the analysis of the expired CO2 volume per breath (VCO2) versus the exhaled VT. The present study measured the mean PA,CO2 and Bohr's dead space ratio (Bohr's dead space/tidal volume (VD,Bohr/VT)) during tidal breathing. AbstractThe lack of methodology for measuring the alveolar carbon dioxide tension (PA,CO2) has forced investigators to make several assumptions, such as that PA,CO2 is equal to end-tidal (PET,CO2) and arterial CO2 tension (Pa,CO2).

Bohr's method for measuring physiologic dead space