open access

Vol 46, No 1 (2014 Jan-Mar)
Original and clinical articles
Submitted: 2014-03-11
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Intraoperative awareness during general anaesthesia: results of the observational survey

Katarzyna M. Szostakiewicz, Dariusz Tomaszewski, Zbigniew Rybicki, Anna Rychlik
DOI: 10.5603/AIT.2014.0005
·
Anaesthesiol Intensive Ther 2014;46(1):23-28.

open access

Vol 46, No 1 (2014 Jan-Mar)
Original and clinical articles
Submitted: 2014-03-11

Abstract

Background: Intraoperative awareness is a rare but extremely unfavourable phenomenon affecting 0.1–0.2% of patients who undergo surgery under general anaesthesia. The event exposes patients to stress and its remote, severe outcomes. The aim of the present study was to determine the incidence of intraoperative awareness in patients undergoing general anaesthesia.

Methods: The observational questionnaire-based study was carried out in patients treated in one centre during a period of 8 months. Anaesthesia depth was monitored clinically using measurements of end-tidal concentration of volatile anaesthetic agent. After anaesthesia, accounts of patients regarding possible intraoperative awareness were analysed. Awareness was defined as recall events are confirmed or have a high likelihood of occuring in the intraoperative period.

Results: Data from 199 patients were analysed. None of them experienced awareness during general anaesthesia (category A). Possible intraoperative awareness was observed in one patient (0.5%) (category B), and 17 patients (8.5%) experienced intraoperative dreaming.

Conclusion: The incidence of intraoperative awareness in our study was low. The intraoperative monitoring including clinical analysis of anaesthetized patient as well as measurement of end-tidal concentration of volatile anaesthetic agent seems to be sufficient for prevention of episodes of awareness during general anaesthesia.

Abstract

Background: Intraoperative awareness is a rare but extremely unfavourable phenomenon affecting 0.1–0.2% of patients who undergo surgery under general anaesthesia. The event exposes patients to stress and its remote, severe outcomes. The aim of the present study was to determine the incidence of intraoperative awareness in patients undergoing general anaesthesia.

Methods: The observational questionnaire-based study was carried out in patients treated in one centre during a period of 8 months. Anaesthesia depth was monitored clinically using measurements of end-tidal concentration of volatile anaesthetic agent. After anaesthesia, accounts of patients regarding possible intraoperative awareness were analysed. Awareness was defined as recall events are confirmed or have a high likelihood of occuring in the intraoperative period.

Results: Data from 199 patients were analysed. None of them experienced awareness during general anaesthesia (category A). Possible intraoperative awareness was observed in one patient (0.5%) (category B), and 17 patients (8.5%) experienced intraoperative dreaming.

Conclusion: The incidence of intraoperative awareness in our study was low. The intraoperative monitoring including clinical analysis of anaesthetized patient as well as measurement of end-tidal concentration of volatile anaesthetic agent seems to be sufficient for prevention of episodes of awareness during general anaesthesia.

Get Citation

Keywords

anaesthesia, general, intraoperative awareness; anaesthesia, general, depth monitoring

About this article
Title

Intraoperative awareness during general anaesthesia: results of the observational survey

Journal

Anaesthesiology Intensive Therapy

Issue

Vol 46, No 1 (2014 Jan-Mar)

Pages

23-28

DOI

10.5603/AIT.2014.0005

Bibliographic record

Anaesthesiol Intensive Ther 2014;46(1):23-28.

Keywords

anaesthesia
general
intraoperative awareness
anaesthesia
general
depth monitoring

Authors

Katarzyna M. Szostakiewicz
Dariusz Tomaszewski
Zbigniew Rybicki
Anna Rychlik

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