Add like
Add dislike
Add to saved papers

Uncontrolled delivery of liquid volatile anaesthetic when using the anaesthetic conserving device.

During patient sedation with liquid volatile anaesthetic, some problems may occur through a process called auto-pumping, defined as an expansion of bubbles inside the syringe, which can lead to uncontrolled anaesthetic delivery. The study examined how the temperature of liquid volatile anaesthetics (sevoflurane and isoflurane) and the presence of gas bubbles in the syringe affect the occurrence of auto-pumping when using the anaesthetic conserving device (ACD, AnaConDa™, Sedana Medical, Uppsala, Sweden). Four different circumstances for each volatile anaesthetic were tested with a bench study: volatile anaesthetic at room temperature or precooled with and without the presence of gas bubbles in the syringe. Liquid volatile anaesthetic was infused into the ACD via a syringe pump at a fixed rate and heated gradually until the temperature of the syringe surface reached 50 °C. A main-stream gas monitor was used to measure the expired fraction of volatile anaesthetic (FE vol%). The occurrence of auto-pumping was observed only in the subgroups containing gas bubbles, with both anaesthetics. In these subgroups, the values of the expired anaesthetic gas fraction increased dramatically with the expansion of gas bubbles in the syringe (ΔFE ranged from +1.6 to 2.4 vol% for sevoflurane and +2.3 to 3.4 vol% for isoflurane). Furthermore, when the heat source was removed, a substantial decline in anaesthetic agent values below the baseline was observed with both anaesthetics. The presence of gas bubbles in the syringe, especially when exposed to a heat source, may provoke auto-pumping with uncontrolled excessive anaesthetic delivery. If auto-pumping is suspected, the syringe pump must be stopped and the ACD removed from the breathing circuit at once.

Full text links

We have located links that may give you full text access.
Can't access the paper?
Try logging in through your university/institutional subscription. For a smoother one-click institutional access experience, please use our mobile app.

For the best experience, use the Read mobile app

Mobile app image

Get seemless 1-tap access through your institution/university

For the best experience, use the Read mobile app

All material on this website is protected by copyright, Copyright © 1994-2024 by WebMD LLC.
This website also contains material copyrighted by 3rd parties.

By using this service, you agree to our terms of use and privacy policy.

Your Privacy Choices Toggle icon

You can now claim free CME credits for this literature searchClaim now

Get seemless 1-tap access through your institution/university

For the best experience, use the Read mobile app