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Combining Volumetric Capnography And Barometric Plethysmography To Measure The Lung Structure-function Relationship

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Comparison of pleural pressure measuring instruments.

Hans J Lee¹, Lonny Yarmus¹, David Kidd¹

¹The Division Pulmonary/Critical Care, Johns Hopkins University, Baltimore, MD.

|May 24, 2014

Summary

A handheld digital manometer (DM) is a valid tool for measuring pleural pressure (Ppl) during thoracentesis, showing strong correlation with electronic transducers. U-tube manometers were less accurate.

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Area of Science:

Pulmonology
Medical Devices
Diagnostic Procedures

Background:

Accurate pleural pressure (Ppl) measurement is crucial during thoracentesis.
Traditional methods like U-tube (UT) manometers may have limitations.
Electronic transducers (ET) are considered a reference standard.

Purpose of the Study:

To compare the accuracy of a handheld digital manometer (DM) against a U-tube (UT) manometer and an electronic transducer (ET) for Ppl measurement during thoracentesis.

Main Methods:

Thirty-three patients undergoing thoracentesis were enrolled.
Pleural pressure (Ppl) was measured using a handheld DM, UT manometer, and ET.
Measurements were taken at various stages, including after fluid aspiration.

Main Results:

A strong linear correlation was found between the DM and ET for elastance (r = 0.9582).
The correlation between the UT manometer and ET was poor (r = 0.0448).
DM and ET measurements showed low correlation in patients experiencing cough (R2 = 0.104).

Conclusions:

The handheld DM is a valid and user-friendly method for measuring Ppl during thoracentesis.
Further research is needed to explore its utility in predicting clinical outcomes.