Anesthesia & Analgesia study to the Operation Theater ICU

Summary

ACKGROUND: The Anesthetic Conserving Device—AnaConDa® (ACD)—has been compared with a conventional vaporizer. However, the accuracy of the administered concentration of volatile anesthetics was not examined. In the present study we measured the accuracy of the ACD when used as a portable vaporizer.

METHODS: This prospective study included 30 ASA I–III patients scheduled for elective surgery under general anesthesia. The patients were randomly organized into 3 groups of 10 patients per group. In each group, the sevoflurane infusion rate was adjusted to deliver 1.0 vol%, 1.5 vol%, and 2.0 vol% alveolar concentration. Hemodynamic data, bispectral index, and end-tidal sevoflurane concentrations were recorded every 2 minutes.

RESULTS: We analyzed 801 data points from 30 patients. The mean difference between the end-tidal sevoflurane concentration and the target concentration was −11.0 ± 9.3% of the target when the target was 1.0 vol%, −5.4 ± 6.4% when the target was 1.5 vol%, and −4.0 ± 7.4% when the target was 2.0 vol%. No significant differences were found in the error at the different target concentrations.

CONCLUSIONS: We found that the ACD may be a valid alternative to the conventional vaporizer. The ACD is very simple to use, delivery rate needs to be adjusted only once per hour, and the anesthetic savings are independent of the circuit characteristics and fresh gas flow rate.

For detailed information se instruction for use.

The AnaConDa is an anaesthetic agent delivery and re-cycling system, developed for isoflurane and sevoflurane.

The Anaconda is a small device that is inserted between the ET-tube and the Y-piece, of the ventilator circuit.

The simplicity of AnaConDa is made possible by the unique high capacity miniature vaporizer and a high efficiency conserving medium.

The unique function of the AnaConDa makes the CO2 absorber and one way valves normally included in an anaesthesia machine unnecessary.

It also makes it possible to deliver anaesthetic agents in an easy and safe way with a standard ventilator.

Clinical set-up

AnaConDa is easy to use. A syringe pump, a gas monitor and a standard ventilator are needed. To fill the AnaConDa Syringe special adaptors with valves are available. We recommend connecting the gas monitor exhaust and ventilator exhaust to a scavenging system although approximately 90% of the agent delivered will be recycled.

Cross section of the AnaConDa

Start of expiration

At the start of expiration the air way contains air/oxygen, CO2 and anaesthetic agents.

Expiration

Air/oxygen and CO2 passes the active carbon out into the ventilator circuit and out through the ventilator exhaust. The anaesthetic agent is adsorbed to the active carbon.

Inspiration

During inspiration the anaesthetic agent is desorbed and transported with the air/oxygen to the patient, together with agent evaporated from the evaporator.

Abstract in A&A: The Accuracy of the Anesthetic Conserving Device (Anaconda) as an Alternative to the Classical Vaporizer in Anesthesia

Product page: The AnaConDa ..

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