Abstract
Objective: To evaluate a simple device which injects a constant fraction of indicator gas to the inspiratory mixture for performing multi-breath wash-out tests during controlled ventilation.Design: the technique in which the indicator gas is injected at the mouth of the patient (post-mix) is compared with the technique where the indicator gas is administered in the bellows of the ventilator (pre-mix).Setting: Surgical Intensive Care Unit of a University Hospital.Patients: 10 post-operative mechanically ventilated patients.Interventions: None.Measurements and results: 3 wash-out tests with the post-mix and 3 wash-out tests with the pre-mix method were performed within an hour on every patient. The calculated mean end expiratory lung volume (EEV) was 1.91±0.871 with the post-mix technique and 1.89±0.881 with the premix technique. There was a good agreement with a mean difference of −1.9±6.5% in the calculated EEV values by the two different techniques.Conclusion: The described injector is an affordable device, is easy to assemble and can be incorporated in most electronically regulated ventilators to perform multi-breath indicator gas wash-out tests for pulmonary monitoring at the bed side of ICU patients.
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Gültuna, I., Huygen, P.E.M., Jabaaij, C. et al. A simple device to inject indicator gas for wash-out tests during mechanical ventilation. Intensive Care Med 18, 304–308 (1992). https://doi.org/10.1007/BF01706480
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DOI: https://doi.org/10.1007/BF01706480