PMID: 12580217Feb 13, 2003Paper

Discriminating between the effect of shunt and reduced VA/Q on arterial oxygen saturation is particularly useful in clinical practice

Journal of Clinical Monitoring and Computing
J G Jones, S E Jones

Abstract

There is an extensive literature on methods for discriminating between an increased shunt and a reduced ratio of ventilation to perfusion. In this review we prefer the terms "VA/Q" and "reduced or low VA/Q" rather than "V/Q inequality" to refer to the effects on arterial oxygenation of reducing V/Q below 0.8 to about 0.1. Almost without exception the conventional methods for measuring shunt and reduced VA/Q are invasive as well as technically complex. For most clinicians who are dealing with a hypoxemic patient the relevance of these entities is not so obvious as to justify the time and difficulty in either understanding or measuring them. However this review shows that, while an increased shunt and a decreased VA/Q both reduce arterial oxygen saturation (SaO2) at a particular inspired oxygen concentration (PIO2), the effect of shunt and reduced VA/Q have important clinical differences on the relationship between PIO2 and SaO2. The review also outlines a simple non-invasive method for measuring shunt and reduced VA/Q which illustrates the value of discriminating between them in clinical practice.

Associated Clinical Trials

Jul 7, 2020·Yasser Mamdouh Hassan Badawy

Citations

Jan 28, 2015·Anesthesia and Analgesia·Jeffrey M Feldman
Nov 26, 2015·Archives of Disease in Childhood. Fetal and Neonatal Edition·J G JonesB J Stenson
May 18, 2016·Anesthesia and Analgesia·Gerardo TusmanFernando Suarez-Sipmann
Apr 10, 2015·Physiological Measurement·Walter KarlenJ Mark Ansermino
Feb 16, 2021·The Journal of Small Animal Practice·M StabileF Staffieri

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