Pulmonary Ventilators as Monitoring Instruments: Measurements and Common Issues

Sergio Silvestri
Università “Campus Bio-Medico” di Roma, Rome, Italy

Series: Medical Procedures, Testing and Technology
BISAC: MED108000

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Volume 10

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Special issue: Resilience in breaking the cycle of children’s environmental health disparities
Edited by I Leslie Rubin, Robert J Geller, Abby Mutic, Benjamin A Gitterman, Nathan Mutic, Wayne Garfinkel, Claire D Coles, Kurt Martinuzzi, and Joav Merrick

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From an analysis of recent literature, mechanical, pneumatic, fluid-dynamic and thermo-hygrometric phenomena taking place in the system connecting the patient to the pulmonary ventilator (breathing circuit) seem to influence, and in a not always repeatable way, the pneumatic parameter values actually applied to the patient, the thermo-hygrometric state of the gas mixture, the response time to patient’s inspiration effort and the measurement of patient respiratory parameters. Probably, in order to better understand the reliability and clinical significance of monitoring results, it is necessary to address the study of pulmonary ventilation by considering the system ventilator-circuit-patient as a whole.

This work, which is intended to represent a food for though for the clinician and researcher dealing with pulmonary ventilation, has the aim to briefly address some causes of possible misleading information which can be obtained from these complex though fascinating machines for vital support. (Imprint: Nova)

Preface

Abstract

Introduction

The Patient – Pulmonary Ventilator System

The Estimation of Airway Pressure

Respiratory Parameters Evaluation Performed by the Ventilator

Volumetric Flow Rate, Mass Flow Rate or Volume Variation?

Corrections due to Gas Temperature and Humidity

Measurements Obtained from Ventilatory Loops

Conclusion

References

Index

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