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Errors in pneumotachography with intermittent positive pressure ventilation.

N Abrahams, G C Fisk, A E Churches

Anaesthesia and Intensive Care

|November 1, 1975

Summary

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Pneumotachography errors during mechanical ventilation are common. This study reveals inaccuracies in specific differential pressure transducers, questioning prior research using this method.

Area of Science:

Respiratory physiology
Medical instrumentation

Background:

Pneumotachography is widely used for measuring airflow during mechanical ventilation.
Previous studies have identified instrument errors associated with pneumotachography during Intermittent Positive Pressure Ventilation (IPPV).

Purpose of the Study:

To investigate and identify sources of inaccuracy in pneumotachography systems used with IPPV.
To evaluate the performance of different differential pressure transducers in IPPV settings.

Main Methods:

A sine-wave pump delivered constant tidal volume to a lung simulator.
Tidal volume was measured using a pneumotachograph with Grass, Statham, and Devices differential pressure transducers.
Pneumatic polarity was manipulated to assess its effect on volume measurements.

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Main Results:

Differential pressure transducers from Grass, Statham, and Devices showed consistent overestimation of exhaled volume compared to inhaled volume.
Changing transducer pneumatic polarity caused significant volume measurement discrepancies, sometimes exceeding the measured volume.
Sanborn 270 and Greer micromanometer transducers exhibited no such artifacts.

Conclusions:

The design of certain differential pressure transducers introduces significant errors in pneumotachography during IPPV.
Published studies utilizing these specific transducers during IPPV may be unreliable.
Further research is needed to validate accurate airflow measurement techniques in IPPV.