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A new method for performing continuous manometry during pleural effusion drainage.

Matthew Salamonsen1, Robert Ware, David Fielding

  • 1Department of Thoracic Medicine, The Royal Brisbane and Women's Hospital, Brisbane, Qld., Australia.

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A new continuous pleural manometry technique using an epidural catheter accurately measures pleural pressure during thoracentesis. This method allows for real-time pleural elastance (PEL) calculation, improving trapped lung assessment.

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Area of Science:

  • Pulmonology
  • Medical Devices
  • Thoracic Surgery

Background:

  • Pleural manometry is crucial for identifying trapped lung and guiding thoracentesis.
  • Current methods require intermittent cessation of fluid drainage for pressure readings.
  • This limitation hinders continuous monitoring during the procedure.

Purpose of the Study:

  • To develop and validate a continuous pleural manometry technique.
  • To utilize an epidural catheter inserted through a drainage tube for real-time pressure transduction.
  • To enable uninterrupted pleural pressure monitoring during thoracentesis.

Main Methods:

  • Simultaneous intermittent and continuous pleural manometry were performed on 10 patients undergoing large-volume thoracentesis.
  • Pleural pressures were recorded after sequential 100 ml fluid drainage increments.
  • Pleural elastance (PEL) curves and confidence intervals were compared between the two techniques.

Main Results:

  • No significant difference in PEL was found between intermittent and continuous methods (p > 0.1).
  • A trend towards narrower confidence intervals for the continuous method was observed (p = 0.08).
  • Automated measurement and real-time PEL display were achieved using a urodynamics machine.

Conclusions:

  • Continuous pleural manometry is feasible using an epidural catheter placed within the pleural space via a drainage tube.
  • This technique provides continuous pleural pressure recording throughout thoracentesis.
  • Automated, real-time calculation and display of pleural pressure and PEL are possible with computer integration.