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Can Bispectral Index aid laryngeal mask placement in children?
Soo Im Lim1, Neil A Chambers, Nicola S Somerville
1Department of Anaesthesia, Princess Margaret Hospital for Children, Perth, Australia.
Insights
The Bispectral Index Score (BIS) does not reliably predict complications during pediatric laryngeal mask airway (LMA) placement. Anesthetist experience and recent upper respiratory infections are better indicators of potential issues.
Area of Science:
- Anesthesiology
- Pediatric Anesthesia
- Airway Management
Background:
- Laryngeal mask airway (LMA) placement necessitates sufficient anesthesia depth to avoid patient movement and airway responses.
- Complications like hypoxia and injury can arise from adverse events during LMA insertion.
- The Bispectral Index Score (BIS) is a novel tool with unestablished utility in pediatric anesthesia.
Purpose of the Study:
- To evaluate the Bispectral Index Score (BIS) as a predictor of successful laryngeal mask airway (LMA) placement in children.
- To determine if BIS values correlate with airway complications during LMA insertion in pediatric patients.
Main Methods:
- A prospective, blinded observational study involving 116 children (1-16 years) undergoing LMA placement.
- Analysis of LMA placement success and complications in relation to BIS values at insertion.
- Consideration of other clinical variables, including anesthetist experience and patient history.
Main Results:
- A minimal difference in BIS values was observed between complicated and successful LMA placements.
- BIS was found to be an unreliable predictor for LMA placement outcomes.
- Anesthetist inexperience and recent upper respiratory tract infection (URTI) were identified as potential predictors of complications.
Conclusions:
- The Bispectral Index Score (BIS) is not a useful tool for predicting or reducing airway complications during pediatric LMA placement.
- Alternative clinical markers may offer better prediction of adverse airway events in this context.
Background:
Laryngeal mask airway (LMA) placement requires an adequate depth of anesthesia to prevent patient movement and adverse airway responses. Patient movement, coughing, stridor or laryngospasm at LMA placement may result in transient hypoxia, injury to the patient and prolong time spent in the anesthetic room. The Bispectral Index Score (BIS) is a relatively new tool that has not yet established its place in routine clinical pediatric anesthesia practice. One potential use may be to predict an adequate depth of anesthesia for successful intraoperative interventions such as LMA placement in children.
Methods:
A total of 116 children aged between 1 and 16 years due to have an LMA placed under general anesthesia were enrolled into this prospective, blinded observational study. Complication or success of LMA placement was then analyzed in relation to the BIS value at the time of placement. Other clinical variables were also considered.
Results:
The difference in BIS values in children with complicated compared with successful LMA placement was small and BIS therefore appears not to be a reliable predictor for either. Inexperience of the anesthetist and a history of recent upper respiratory tract infection (URTI) may be better indicators for complications.
Conclusions:
Bispectral Index Score appears, from this study, not to be a useful tool to help predict complications of LMA placement or to help reduce airway complications during LMA placement. Other markers may be more useful predictors of adverse airway events.
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