Document Detail

Does patient position influence the reading of the bispectral index monitor?
MedLine Citation:
PMID:  19923512     Owner:  NLM     Status:  MEDLINE    
BACKGROUND: Bispectral index (BIS) was developed to monitor patients' level of consciousness under general anesthesia. Several factors have been found to alter BIS readings without affecting the depth of anesthesia. We conducted a study to assess the impact of changing patients' position on BIS readings. METHODS: General anesthesia was administered to 40 patients undergoing minor surgeries. Patients were kept in neutral position (supine) for 15 min and BIS readings, mean arterial blood pressure, heart rate, end-tidal carbon dioxide, and end-tidal isoflurane were recorded. Patients were then shifted to head-down position (30 degrees), neutral position, and lastly head-up position (30 degrees) each of 15-min duration and the data were recorded. RESULTS: There was a significant increase in BIS values in head-down position (median 47 vs 40) compared with neutral position, whereas head-up position significantly decreased BIS (39 vs 41) compared with neutral position (P < 0.05). CONCLUSION: Changing a patient's position significantly affects the BIS values, which might affect the interpretation of anesthetic depth.
Abdullah M Kaki; Waleed A Almarakbi
Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  Anesthesia and analgesia     Volume:  109     ISSN:  1526-7598     ISO Abbreviation:  Anesth. Analg.     Publication Date:  2009 Dec 
Date Detail:
Created Date:  2009-11-20     Completed Date:  2009-12-03     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  1310650     Medline TA:  Anesth Analg     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1843-6     Citation Subset:  AIM; IM    
Department of Anesthesia, Faculty of Medicine, King Abdulaziz University Hospital, PO Box 2907, Jeddah 21461, Saudi Arabia.
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MeSH Terms
Anesthesia, General*
Blood Gas Analysis
Blood Pressure
Blood Pressure Determination
Blood Pressure Monitors
Consciousness Monitors
Electroencephalography* / instrumentation
Head-Down Tilt
Heart Rate
Middle Aged
Monitoring, Intraoperative / instrumentation,  methods*
Predictive Value of Tests
Prospective Studies
Signal Processing, Computer-Assisted
Supine Position
Surgical Procedures, Elective
Time Factors
Young Adult

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