How can intrapleural pressure be measured?

Intrapleural pressure can be measured with a balloon catheter placed in the esophagus because this method provides a direct measurement of the pressure within the pleural cavity. The esophagus is in close proximity to the pleural space, and as intrapleural pressure changes during breathing, these changes can be detected via the pressure within the esophagus. This technique is often utilized in clinical settings to assess lung function and the mechanics of breathing, especially in patients with respiratory issues.

Using a stethoscope primarily allows for the assessment of breath sounds and does not provide a direct measurement of pressure. Blood tests are not used for measuring intrapleural pressure as they are designed to analyze substances within the bloodstream. Imaging the thoracic cavity, such as through X-rays or CT scans, can reveal structural aspects and issues within the lungs but does not measure the pressure dynamics in the pleural space directly.