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Related Experiment Videos

Pressure infusor devices. Do they generate the pressures indicated?

P Cox1

  • 1Department of Anaesthesia, Motala Hospital, Sweden.

Anaesthesia
|January 1, 1988
PubMed
Summary

Pressure infusor devices show significant pressure discrepancies between the manometer reading and actual fluid pressure. These inaccuracies, dependent on remaining fluid volume, can lead to critical pressure variations during infusion.

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Area of Science:

  • Medical Devices
  • Biomedical Engineering
  • Clinical Engineering

Background:

  • Pressure infusor devices are commonly used in healthcare settings to rapidly administer intravenous fluids.
  • Accurate pressure delivery is crucial for effective and safe fluid management, especially in critical care scenarios.

Purpose of the Study:

  • To evaluate the accuracy of pressure readings on three different pressure infusor devices.
  • To determine the correlation between the infusor manometer pressure and the actual pressure within the infusion system.

Main Methods:

  • Tested three distinct pressure infusor devices.
  • Measured infusion system pressure at a set infusor bag pressure (300 mmHg) while emptying fluid in 50 ml aliquots.
  • Determined the infusor bag pressure needed to maintain 300 mmHg as fluid was stepwise removed.

Main Results:

  • Significant discrepancies observed between infusor manometer readings and actual fluid pressure, unrelated to manometer error.
  • Pressure variations ranged from 170 mmHg above to 200 mmHg below the indicated 300 mmHg.
  • One device failed to maintain 300 mmHg pressure with 100 ml of fluid remaining.

Conclusions:

  • Current pressure infusor devices exhibit substantial inaccuracies in pressure delivery.
  • The amount of fluid remaining in the infusion bag significantly impacts pressure accuracy.
  • These findings highlight potential risks and necessitate careful consideration of device performance in clinical practice.

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