Evaluation of two processed EEG analyzers for assessment of sedation after coronary artery bypass grafting.

Abstract:

OBJECTIVES:Processed EEG monitoring has been suggested for sedation depth evaluation in intensive care unit (ICU) patients. The present study investigated the efficacy of two processed EEG monitors using SEF90% or SEF95% and BIS to differentiate between conscious (Ramsay score 4) and unconscious sedation (Ramsay score 6). DESIGN AND SETTING:Prospective, randomized trial in a surgical ICU of a university teaching hospital. PATIENTS:Patients recovering from elective coronary bypass grafting. INTERVENTION:One of two EEG analyzers was installed (A: Aspect A-1000 measuring SEF95% and BIS; D: Drager pEEG measuring SEF90%). At ICU admission unconscious sedation (Ramsay score 6), and at three 30-min intervals conscious sedation (Ramsay score 4) were investigated. MEASUREMENTS AND RESULTS:Fourteen patients were monitored by A and 14 by D. The interindividual variability (coefficient of variation 32-69 %) was large for all three processed EEG methods. SEF90% of analyzer D and BIS of analyzer A showed a statistically significant difference between unconscious and conscious sedation (11 +/- 3 and 17 +/- 6 Hz, p = 0.005; 74 +/- 10 and 83 +/- 10, p = 0.02). Positive and negative predictive values for SEF90% of analyzer D (0.57, 95% CI 0.34-0.77; and 0.92, 95% CI 0.64-0.99) and BIS of analyzer A (0.55, 95 % CI 0.32-0.76; and 0.87, 95 % CI 0.60-0.98) were too low for discrimination between conscious and unconscious sedation. CONCLUSIONS:The use of processed EEG monitoring cannot be recommended for assessing sedation depth after cardiac surgery.

journal_name

Intensive Care Med

journal_title

Intensive care medicine

authors

Walder B,Suter PM,Romand JA

doi

10.1007/s001340000761

keywords:

subject

Has Abstract

pub_date

2001-01-01 00:00:00

pages

107-14

issue

1

eissn

0342-4642

issn

1432-1238

journal_volume

27

pub_type

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