Accuracy of the end-expiratory lung volume measured by the modified nitrogen washout/washin technique: a bench study.

ABSTRACT:

Background

The functional residual capacity (FRC) determines the oxygenating capacity of the lung and is heavily affected in the clinical context of the acute respiratory distress syndrome. Nitrogen-wash-in/wash-out methods have been used to measure FRC. These methods have rarely been validated against exactly known volumes. The aim of the study was to assess the accuracy and precision of the N₂ washout/washin method in measuring FRC, by comparing it with set volumes in a lung simulator.

Methods

We conducted a diagnostic bench study in the Intensive Care Unit and Radiology Department of a tertiary hospital in Switzerland. Using a fully controllable high fidelity lung simulator (TestChest®), we set the functional residual capacity at 1500 ml, 2000 ml and 2500 ml an

SUBMITTER: Berger-Estilita J 

PROVIDER: S-EPMC7815189 | biostudies-literature | 2021 Jan

REPOSITORIES: biostudies-literature