Flow‐pressure characteristics of a <scp>GE</scp> Healthcare Aisys <scp>CS</scp><sup>2</sup><scp>APL</scp> valve

Thomas, Jörg; Weiß, Markus

doi:10.1111/anae.13860

Anaesthesia

2017

DOI: 10.1111/anae.13860

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Flow‐pressure characteristics of a GE Healthcare Aisys CS²APL valve

Jörg Thomas

Markus Weiß

Abstract: manually ventilating a patient with a fixed APL valve position, and a full reservoir bag at end-expiration. However, this discrepancy diminishes as the APL valve was closed; fully screwed down, the airway pressures were 60 AE 5 cm H 2 O at all flow rates tested. We suspect that the same APL valve may form part of Intersugical's other breathing systems.

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2023

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The importance of post marketing quality control

Buehler¹,

Weiß²,

Wendel-Garcia³

et al. 2023

European Journal of Anaesthesiology Intensive Care

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BACKGROUND A previously published study reported on the nonlinear behaviour for airway pressure and tidal volume of the adjustable pressure-limiting (APL) valve of the Aisys CS2 anaesthesia machine (GE Healthcare, Madison, Wisconsin, USA) during manual bag ventilation. In co-operation with the manufacturer, an adapted APL valve was developed. OBJECTIVE To test and characterise the performance of an adapted APL valve and assess its clinical usability. DESIGN Two-stage study, consisting of an in-vitro testing of an adapted APL valve in a baby and adolescent lung model, followed by a clinical experience survey of anaesthesia personnel after the official implementation of the new APL valve into clinical routine. SETTING Anaesthesia Department at the University Children's Hospital Zurich. MAIN OUTCOME MEASURES Airway pressures and inspiratory tidal volumes during opening and closure of the APL valve at different settings. Likert scale assessment of performance expectance, effort expectance, behavioural intention and safety of the APL valve during clinical use. RESULTS In contrast to the original APL valve of the GE Aisys CS2, the adapted APL valve showed a nearly linear increase in airway pressures as well as in the tidal volumes measured. Most importantly, the measured pressures never exceeded the set pressures. Based on the experimental findings, all original APL valves of the GE Aisys CS2 were replaced by the adapted APL valve. Two months later, an anonymised and standardised questionnaire was handed out to all employees working with the adapted APL valve. Analysis of the questionnaire indicated that the adapted APL valve is easier and more precise to handle in the daily routine than the original one. CONCLUSION The newly adapted APL valve for the GE Aisys CS2 has considerably improved its linearity at lower pressures and supports our institution's bag mask ventilation practices.

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The importance of post marketing quality control

Buehler¹,

Weiß²,

Wendel-Garcia³

et al. 2023

European Journal of Anaesthesiology Intensive Care

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show abstract

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Flow‐pressure characteristics of a GE Healthcare Aisys CS²APL valve

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References 3 publications

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Flow‐pressure characteristics of a GE Healthcare Aisys CS2APL valve

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Flow‐pressure characteristics of a GE Healthcare Aisys CS²APL valve