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9 Ιαν 2023 · The direct measurement of pleural pressures during thoracentesis is known as pleural manometry. The indications, technique, and interpretation of pleural pressures during pleural fluid manometry will be reviewed here.
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.
3 Σεπ 2017 · Subatmospheric pleural pressure (Ppl), which is approximately −3 to −5 cmH2O at functional residual capacity (FRC) makes pleura a unique organ in the human body. The negative Ppl is critical for maintaining the lungs in a properly inflated state and for proper blood circulation within the thorax.
This condition creates excessively negative pressure in the pleural space as the chest wall moves outward during inspiration; during inspiration, the trapped lung resists deformation. Thus, for any given expansion of the chest wall and lung during inspiration, the pleural pressure is more negative.
29 Ιουλ 2021 · A unique feature of the pleural cavity is the negative, sub-atmospheric, pressure within this space, ranging between −3 and −5 cmH 2 O at functional residual capacity (FRC) and −6 to −10 cmH 2 O during the inspiratory phase of quiet breathing [1•, 2].
Pleural pressure is usually measured at the beginning of the thoracentesis (opening pressure), after removal of 240 cc of fluid, and at the end of the thoracentesis (closing pressure). To our knowledge, no published studies document the negative pressure that occurs during the actual drainage.
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.
