open access

Vol 49, No 1 (2017)
Original and clinical articles
Published online: 2017-03-31
Submitted: 2016-06-30
Accepted: 2016-12-04
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Comparison of anaesthetic gas consumption and stability of anaesthesia using automatic and manual control over the course of anaesthesia

Tomasz Skalec, Agnieszka Górecka-Dolny, Stanisław Zieliński, Mirosław Gibek, Łukasz Stróżecki, Andrzej Kübler
DOI: 10.5603/AIT.2017.0008
·
Anaesthesiol Intensive Ther 2017;49(1):34-39.

open access

Vol 49, No 1 (2017)
Original and clinical articles
Published online: 2017-03-31
Submitted: 2016-06-30
Accepted: 2016-12-04

Abstract

BACKGROUND: The automatic control module of end-tidal volatile agents (EtC) was designed to reduce the consumption of anaesthetic gases, increase the stability of general anaesthesia and reduce the need for adjustments in the settings of the anaesthesia machine. The aim of this study was to verify these hypotheses.

METHODS: The course of general anaesthesia with the use of the EtC module was analysed for haemodynamic stability, depth of anaesthesia, end-expiratory concentration of anaesthetic, number of ventilator key presses, fentanyl supply, consumption of volatile agents and anaesthesia and operation times. These data were compared with the data obtained during general anaesthesia controlled manually and were processed with statistical tests.

RESULTS: Seventy-four patients underwent general anaesthesia for scheduled operations. Group AUTO-ET (n = 35) was anaesthetized with EtC, and group MANUAL-ET (n = 39) was controlled manually. Both populations presented similar anaesthesia stability. No differences were noted in the time of anaesthesia, saturation up to MAC 1.0 or awakening. Data revealed no differences in mean EtAA or the fentanyl dose. The AUTO-ET group exhibited fewer key presses per minute, 0.0603 min-1, whereas the MANUAL-ET exhibited a value of 0.0842 min-1; P = 0.001. The automatic group consumed more anaesthetic and oxygen per minute (sevoflurane 0.1171 mL min-1; IQR: 0.0503; oxygen 1.8286 mL min-1, IQR: 1,3751) than MANUAL-ET (sevoflurane 0.0824 mL min-1, IQR: 0.0305; oxygen 1,288 mL min-1, IQR: 0,6517) (P = 0.0028 and P = 0.0171, respectively).

CONCLUSION: Both methods are equally stable and safe for patients. The consumption of volatile agents was significantly increased in the AUTO-ET group. EtC considerably reduces the number of key presses.

Abstract

BACKGROUND: The automatic control module of end-tidal volatile agents (EtC) was designed to reduce the consumption of anaesthetic gases, increase the stability of general anaesthesia and reduce the need for adjustments in the settings of the anaesthesia machine. The aim of this study was to verify these hypotheses.

METHODS: The course of general anaesthesia with the use of the EtC module was analysed for haemodynamic stability, depth of anaesthesia, end-expiratory concentration of anaesthetic, number of ventilator key presses, fentanyl supply, consumption of volatile agents and anaesthesia and operation times. These data were compared with the data obtained during general anaesthesia controlled manually and were processed with statistical tests.

RESULTS: Seventy-four patients underwent general anaesthesia for scheduled operations. Group AUTO-ET (n = 35) was anaesthetized with EtC, and group MANUAL-ET (n = 39) was controlled manually. Both populations presented similar anaesthesia stability. No differences were noted in the time of anaesthesia, saturation up to MAC 1.0 or awakening. Data revealed no differences in mean EtAA or the fentanyl dose. The AUTO-ET group exhibited fewer key presses per minute, 0.0603 min-1, whereas the MANUAL-ET exhibited a value of 0.0842 min-1; P = 0.001. The automatic group consumed more anaesthetic and oxygen per minute (sevoflurane 0.1171 mL min-1; IQR: 0.0503; oxygen 1.8286 mL min-1, IQR: 1,3751) than MANUAL-ET (sevoflurane 0.0824 mL min-1, IQR: 0.0305; oxygen 1,288 mL min-1, IQR: 0,6517) (P = 0.0028 and P = 0.0171, respectively).

CONCLUSION: Both methods are equally stable and safe for patients. The consumption of volatile agents was significantly increased in the AUTO-ET group. EtC considerably reduces the number of key presses.

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Keywords

anaesthesia, general; anaesthetic, volatile, sevoflurane; automatic control

About this article
Title

Comparison of anaesthetic gas consumption and stability of anaesthesia using automatic and manual control over the course of anaesthesia

Journal

Anaesthesiology Intensive Therapy

Issue

Vol 49, No 1 (2017)

Pages

34-39

Published online

2017-03-31

DOI

10.5603/AIT.2017.0008

Bibliographic record

Anaesthesiol Intensive Ther 2017;49(1):34-39.

Keywords

anaesthesia
general
anaesthetic
volatile
sevoflurane
automatic control

Authors

Tomasz Skalec
Agnieszka Górecka-Dolny
Stanisław Zieliński
Mirosław Gibek
Łukasz Stróżecki
Andrzej Kübler

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