Related Experiment Videos
[Measurement of transdiaphragmatic pressure in pulmonary emphysema, a relevant contribution to clinical management?]
M A Schulz1, U Hindley, R Dierkesmann
1Klinik Schillerhöhe, Zentrum für Pneumologie und Thoraxchirurgie, Gerlingen/Stuttgart.
Abstract:
In 50 patients with advanced pulmonary emphysema, admitted for operative lung volume reduction, transdiaphragmatic pressure was measured by a double balloon catheter, using the sniff technique.Transdiaphragmatic pressure (pdi) is the difference between gastric pressure (pga) and esophageal pressure (pes). The mean value of pdi in the sitting position was 5,9 kPa (SD 1,6 kPa), in the lying position 5,6 kPa (SD 1,3 kPa). 94 % of the patients had a pathologic pdi (below 8,2 kPa). The reduction of diaphragm function in this patient group was quantified. No significant difference was found between sitting or lying position. There was no clear correlation between pdi and the reduction in lung function. Maybe there are other important factors, for example the influence of the deformation in the chest wall itself.
Related Concept Videos
Measurement of Blood Pressure
Pressure Relationships in Thoracic Cavity
Breathing Mechanisms
Both intra-alveolar and intrapleural pressures rely on specific lung properties. The ability to breathe—allowing air to enter the lungs during...
Pulmonary Ventilation: Inhalation
Boyle's law becomes particularly pertinent when examining respiratory...
Chronic Obstructive Pulmonary Disease II: Emphysema
Assessment of Diffusion and Perfusion
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...
Chronic Obstructive Pulmonary Disease-IV: Assessement and Diagnostic Studies
Medical History