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Effect of beach chair position on bispectral index values during arthroscopic shoulder surgery.

Lee SW, Choi SE, Han JH, Park SW, Kang WJ, Choi YK - Korean J Anesthesiol (2014)

Bottom Line: Bispectral index (BIS) monitoring reduces the cases of intraoperative awareness.After 15 minutes, data were recorded.A significant decrease in BIS values (P < 0.01) associated with a position change from neutral position to beach chair position was evident.

View Article: PubMed Central - PubMed

Affiliation: Department of Anesthesiology and Pain Medicine, Kyung Hee University Medical Center, Seoul, Korea.

ABSTRACT

Background: Bispectral index (BIS) monitoring reduces the cases of intraoperative awareness. Several factors can alter BIS readings without affecting the depth of anesthesia. We conducted a study to assess the impact of beach chair position (sitting position) on BIS readings.

Methods: General anesthesia was administered to 30 patients undergoing arthroscopic shoulder surgery. Patients were kept in neutral position (supine) for 10 minutes and BIS readings, mean arterial blood pressure, heart rate, end-tidal carbon dioxide, and end-tidal sevoflurane were recorded. Patients were then shifted to beach chair position. After 15 minutes, data were recorded.

Results: A significant decrease in BIS values (P < 0.01) associated with a position change from neutral position to beach chair position was evident.

Conclusions: BIS values are significantly decreased in the beach chair position compared with the neutral position and might affect interpretation of the depth of anesthesia.

No MeSH data available.


Related in: MedlinePlus

The relationship between mean arterial pressure (MAP) and bispectral index (BIS). Pearson correlation coefficient is 0.696. BIS = -5.463 + 0.492 × MAP, R2 = 0.48, P < 0.01.
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Figure 2: The relationship between mean arterial pressure (MAP) and bispectral index (BIS). Pearson correlation coefficient is 0.696. BIS = -5.463 + 0.492 × MAP, R2 = 0.48, P < 0.01.

Mentions: Thirty patients (15 males, 15 females) were included in the study. Patients' characteristics are summarized in Table 1. There was a statistically significant decrease in BIS values in the beach chair position compared with supine position (P < 0.01) (Fig. 1 and Table 2). The beach chair position also induced a significant decrease in MAP (P < 0.01). Additionally, the correlations between MAP and BIS values were statistically significant (Pearson correlation coefficient: 0.696, P < 0.01) and regression analysis revealed that increased MAP significantly raised BIS value (R2 = 0.48, P < 0.01) (Fig. 2). There were no significant changes in HR (P = 0.18), SpO2 (P = 0.23), ETCO2 (P = 0.11), or Etsevo (P = 0.25) (Table 2). There were no significant correlations between BIS values and HR, SpO2, ETCO2, and Etsevo. All values are expressed as mean ± standard deviation (SD).


Effect of beach chair position on bispectral index values during arthroscopic shoulder surgery.

Lee SW, Choi SE, Han JH, Park SW, Kang WJ, Choi YK - Korean J Anesthesiol (2014)

The relationship between mean arterial pressure (MAP) and bispectral index (BIS). Pearson correlation coefficient is 0.696. BIS = -5.463 + 0.492 × MAP, R2 = 0.48, P < 0.01.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4216784&req=5

Figure 2: The relationship between mean arterial pressure (MAP) and bispectral index (BIS). Pearson correlation coefficient is 0.696. BIS = -5.463 + 0.492 × MAP, R2 = 0.48, P < 0.01.
Mentions: Thirty patients (15 males, 15 females) were included in the study. Patients' characteristics are summarized in Table 1. There was a statistically significant decrease in BIS values in the beach chair position compared with supine position (P < 0.01) (Fig. 1 and Table 2). The beach chair position also induced a significant decrease in MAP (P < 0.01). Additionally, the correlations between MAP and BIS values were statistically significant (Pearson correlation coefficient: 0.696, P < 0.01) and regression analysis revealed that increased MAP significantly raised BIS value (R2 = 0.48, P < 0.01) (Fig. 2). There were no significant changes in HR (P = 0.18), SpO2 (P = 0.23), ETCO2 (P = 0.11), or Etsevo (P = 0.25) (Table 2). There were no significant correlations between BIS values and HR, SpO2, ETCO2, and Etsevo. All values are expressed as mean ± standard deviation (SD).

Bottom Line: Bispectral index (BIS) monitoring reduces the cases of intraoperative awareness.After 15 minutes, data were recorded.A significant decrease in BIS values (P < 0.01) associated with a position change from neutral position to beach chair position was evident.

View Article: PubMed Central - PubMed

Affiliation: Department of Anesthesiology and Pain Medicine, Kyung Hee University Medical Center, Seoul, Korea.

ABSTRACT

Background: Bispectral index (BIS) monitoring reduces the cases of intraoperative awareness. Several factors can alter BIS readings without affecting the depth of anesthesia. We conducted a study to assess the impact of beach chair position (sitting position) on BIS readings.

Methods: General anesthesia was administered to 30 patients undergoing arthroscopic shoulder surgery. Patients were kept in neutral position (supine) for 10 minutes and BIS readings, mean arterial blood pressure, heart rate, end-tidal carbon dioxide, and end-tidal sevoflurane were recorded. Patients were then shifted to beach chair position. After 15 minutes, data were recorded.

Results: A significant decrease in BIS values (P < 0.01) associated with a position change from neutral position to beach chair position was evident.

Conclusions: BIS values are significantly decreased in the beach chair position compared with the neutral position and might affect interpretation of the depth of anesthesia.

No MeSH data available.


Related in: MedlinePlus