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Article Abstract
Background: Monitoring oxygen delivery to the oxygenator of a heart lung machine (HLM) is typically accomplished with an O analyzer connected to the gas inflow line. It is assumed when the FiO is greater than 21% that oxygen is being delivered to the oxygenator. However, this assumption is imperfect because the connection of the inflow line to the oxygenator is downstream from the O analyzer. FiO monitoring will not alert the perfusionist if the inflow line is not actually connected to the oxygenator. Measuring the fraction of expired oxygen (FEO) is a more reliable way of monitoring O delivery.
Methods: An O analyzer was placed on the scavenging line that is attached to the exhaust port of oxygenator (FEO).
Results: Whenever the FiO is greater than 21%, and the inflow line is properly connected, the FEO exiting the oxygenator is greater than 21%. The FEO falls to 21% when the inflow line is not functioning.
Conclusion: Monitoring the FEO is a more reliable way to verify O delivery to an oxygenator. An alarm can be set on the FEO monitor to alert the perfusionist if the FEO falls below a predetermined threshold so any issue with O delivery will always be recognized.
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| http://dx.doi.org/10.1177/02676591211001594 | DOI Listing |
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