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Pleural pressure, or Ppl, is the pressure surrounding the lung, within the pleural space. During quiet breathing, the pleural pressure is negative; that is, it is below atmospheric pressure. The pleura is a thin membrane which invests the lungs and lines the walls of the thoracic cavity.
Intrapleural pressure depends on the ventilation phase, atmospheric pressure, and the volume of the intrapleural cavity. [2] At rest, there is a negative intrapleural pressure. This provides a transpulmonary pressure, causing the lungs to expand.
24 Φεβ 2023 · Although it fluctuates during inspiration and expiration, intrapleural pressure remains approximately –4 mm Hg throughout the breathing cycle. Competing forces within the thorax cause the formation of the negative intrapleural pressure.
28 Αυγ 2023 · Pleurisy - pleura inflammation, causing sharp pain with breathing; most commonly caused by a viral infection. Pleural effusion - excess fluid in the pleural space; commonly from congestive heart failure or malignancy.
Another study of 57 patients identified 9 with post-thoracentesis pneumothorax. 58 In those with pneumothorax, the most negative pleural pressure during thoracentesis was −10.8 cm H 2 O in patients with an expandable lung and −17.3 cm H 2 O in those with a nonexpandable lung.
23 Αυγ 2021 · Intrapleural pressure becomes more negative, typically to -8cmH2O. When P pl > P el, the lungs expands. Alveolar pressure (P A) becomes sub-atmospheric, and inspiration occurs. At end inspiration: P pl = P el. P A = P atmospheric. Expiration. Muscular relaxation causes the chest wall to passively return to their resting position.
18 Σεπ 2016 · Any theory for pleural pressure needs to explain certain crucial facts, including that the lung and chest walls exert an equal and opposite recoil pressure . It would need to explain the negative values for pleural pressure, and why apical pleural pressure is more negative than at the base.
