Efficacy of the A‐line™ AEP monitor as a tool for predicting successful insertion of a laryngeal mask during sevoflurane anesthesia

Alpiger, S.; Helbo-Hansen, Hans S.; Vach, Werner; Ørding, Helle

doi:10.1111/j.0001-5172.2004.00425.x

Cited by 13 publications

(4 citation statements)

References 22 publications

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“…This finding is of interest since, in contrast to the present study, AAI monitoring has previously been shown to predict movement in response to painful stimulus [ 23 ]. Prediction of patient movement, however, is an as yet largely unmet demand made of exclusively EEG-based depth-of-anesthesia monitoring devices (e.g.…”

Section: Discussionmentioning

confidence: 69%

How bispectral index compares to spectral entropy of the EEG and A-line ARX index in the same patient

et al. 2018

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AbstractBackgroundBispectral index (BIS) monitoring of depth of anesthesia has pioneered the field for more recent monitoring devices like the A-line ARX Index (AAI) or the state (SE) and response entropy (RE) monitoring devices. Following an observational design the present study aimed to simultaneously compare in the same patient recorded BIS, AAI and entropy values.MethodsData from patients (n = 32) undergoing minor gynecological operations were analyzed. For all patients, standardized anesthesia was used. Before induction of anesthesia AEP electrodes, BIS and entropy sensors were simultaneously placed on the forehead and recordings were started at 3 minutes before induction and continued until patient transfer to the postanesthesia care unit. Markers were set at defined landmarks.ResultsAnesthesia reduced mean BIS, AAI and entropy values. During uneventful, and even more pronounced, during eventful anesthesia BIS/ entropy and BIS/ AAI values showed better correlation than did AAI and entropy values. The prediction probability (Pk) of AAI (0.824 ± 0.036) and RE (0.786 ± 0.040) or SE (0.781 ± 0.040) for preanesthesia awake, postanesthesia awake or anesthesia was comparable and significantly greater than that of BIS (0.705 ± 0.047). However, only 20% of BIS, AAI and entropy values simultaneously categorized the state of the patient as awake, inadequate anesthesia, optimal anesthesia or deep anesthesia.ConclusionThe prediction probability (Pk) of entropy and AAI was comparable and better than that of BIS. However, agreement between BIS, AAI and entropy measurements on patient state was poor.

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Section: Discussionmentioning

confidence: 69%

How bispectral index compares to spectral entropy of the EEG and A-line ARX index in the same patient

et al. 2018

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“…As FE 0 sevoflurane appeared to correlate more closely with LMA insertion conditions, 7 we also performed a post hoc analysis of FE 0 sevoflurane as a predictor for intubation conditions, although this was not part of the original protocol. Great care should be taken when evaluating these data as the investigator was not blinded with regard to the FE 0 sevoflurane .…”

Section: Discussionmentioning

confidence: 99%

Efficacy of A-line™ AEP Monitor as a tool for predicting acceptable tracheal intubation conditions during sevoflurane anaesthesia

Alpiger

Helbo-Hansen

Vach

et al. 2005

British Journal of Anaesthesia

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“…A laryngeal mask airway was inserted, and then the sevoflurane turned off until the end‐tidal concentration fell to 2%. The sevoflurane was then re‐instituted to maintain the end‐tidal concentration at 2% throughout the measurement period . After a further stabilisation period of 5–10 min, the second set of signal recordings took place.…”

Section: Methodsmentioning

confidence: 99%

The discriminatory value of cardiorespiratory interactions in distinguishing awake from anaesthetised states: a randomised observational study

et al. 2015

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SummaryDepth of anaesthesia monitors usually analyse cerebral function with or without other physiological signals; non‐invasive monitoring of the measured cardiorespiratory signals alone would offer a simple, practical alternative. We aimed to investigate whether such signals, analysed with novel, non‐linear dynamic methods, would distinguish between the awake and anaesthetised states. We recorded ECG, respiration, skin temperature, pulse and skin conductivity before and during general anaesthesia in 27 subjects in good cardiovascular health, randomly allocated to receive propofol or sevoflurane. Mean values, variability and dynamic interactions were determined. Respiratory rate (p = 0.0002), skin conductivity (p = 0.03) and skin temperature (p = 0.00006) changed with sevoflurane, and skin temperature (p = 0.0005) with propofol. Pulse transit time increased by 17% with sevoflurane (p = 0.02) and 11% with propofol (p = 0.007). Sevoflurane reduced the wavelet energy of heart (p = 0.0004) and respiratory (p = 0.02) rate variability at all frequencies, whereas propofol decreased only the heart rate variability below 0.021 Hz (p < 0.05). The phase coherence was reduced by both agents at frequencies below 0.145 Hz (p < 0.05), whereas the cardiorespiratory synchronisation time was increased (p < 0.05). A classification analysis based on an optimal set of discriminatory parameters distinguished with 95% success between the awake and anaesthetised states. We suggest that these results can contribute to the design of new monitors of anaesthetic depth based on cardiovascular signals alone.

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Efficacy of the A‐line™ AEP monitor as a tool for predicting successful insertion of a laryngeal mask during sevoflurane anesthesia

Abstract: AAI indicates the level of depth of anesthesia necessary for acceptable laryngeal mask insertion conditions. End-expiratory sevoflurane concentration was the better predictor.

Cited by 13 publications

References 22 publications

How bispectral index compares to spectral entropy of the EEG and A-line ARX index in the same patient

How bispectral index compares to spectral entropy of the EEG and A-line ARX index in the same patient

Efficacy of A-line™ AEP Monitor as a tool for predicting acceptable tracheal intubation conditions during sevoflurane anaesthesia

The discriminatory value of cardiorespiratory interactions in distinguishing awake from anaesthetised states: a randomised observational study

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