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CVI BIS study.

- candidate number7695
- NTR NumberNTR2193
- ISRCTNISRCTN wordt niet meer aangevraagd.
- Date ISRCTN created
- date ISRCTN requested
- Date Registered NTR27-jan-2010
- Secondary IDsP09.114 Department of Anesthesiology, LUMC
- Public TitleCVI BIS study.
- Scientific TitleMeasurement of nociception and prediction of movement during combined general epidural anesthesia in ASA I-III patients undergoing major abdominal surgery using bilateral frontal EEG measurements and hemodynamic parameters .
- hypothesisWhen insufficient amounts of analgesics have been infused during anestesia, the BIS response a surgical stimulus will be larger and the BIS and EMG display increased variability (CVI).
- Healt Condition(s) or Problem(s) studiedAnesthesia, Analgesic therapy, CVI
- Inclusion criteria1. Age: 18-80 years;
2. Sex: Male or female;
3. Surgery: Elective abdominal surgery lasting at least 2 hours. This includes gynecological procedures (eg., abdominal hysterectomies), urological procedures (eg., radical prostatectomies), GI-surgery (eg., colon surgery);
4. ASA status: 1, 2 or 3.
- Exclusion criteria1. Age: < 18 or > 80 years;
2. Unable to give written informed consent;
3. Pregnancy/lactation;
4. Extreme obesity: BMI > 35;
5. Perceived difficult intubation requiring muscle relaxation.
- mec approval receivedyes
- multicenter trialno
- randomisedyes
- masking/blindingDouble
- controlActive
- groupParallel
- Type2 or more arms, randomized
- Studytypeintervention
- planned startdate 1-okt-2009
- planned closingdate1-apr-2014
- Target number of participants60
- InterventionsSixty ASA I-III patients for elective abdominal surgery will be given an epidural catheter prior to induction. After placement of the catheter, anesthesia will be started either with the epidural anesthesia/sevoflurane + fentanyl in a high dose (7mcg/kg) or with a low (2mcg/kg) dose. No muscle relaxation will be used for intubation. Anesthesia will be maintained with sevoflurane and fentanyl bolus 2-3mcg/kg (high dose) vs 0,5-1mcg/kg (low dose) as judged by the attending anesthesiologist.
- Primary outcomeWe will monitor patient movement and corresponding CVI & BIS values as a measure of adequate pain relief during surgery.
- Secondary outcomeAny change in cardiovascular variables. Cardiovascular monitoring will include: Pulse transit time (PTT), heart-rate, blood pressure and cardiac output as calculated from the arterial pressure pulse wave.
- TimepointsFrom start of induction until end of surgery.
- Trial web siteN/A
- statusopen: patient inclusion
- Sponsor/Initiator Leiden University Medical Center (LUMC), Department of Anaesthesiology
- Funding
(Source(s) of Monetary or Material Support)
Aspect Medical systems
- PublicationsN/A
- Brief summaryAnesthesia has made enormous progress in the last couple of decades making surgery a reliable and safe procedure with minimal morbidity and mortality. Despite the progress many aspects of anesthesia remain elusive. Two important items that have recently been the focus of attention are the measurement of the depth of anesthesia and the measurement of nociception (or ‘pain-related afferent input’) during anesthesia. The current study will focus on the latter of these two items: measurement of nociception during anesthesia. In order to get an indication of nociception we will make use of a recently developed index from the frontal EEG and EMG, the Composite Variability Index (CVI) by Aspect medical Systems. The CVI is based on the observations that the EEG-related variable BIS (bispectral index) rapidly responds to painful surgical stimuli during anesthesia and that the BIS waveform and EMG are more variable in case of a low analgesic load. This indicates that when insufficient amounts of analgesics have been infused the BIS response (ie increase) to a surgical stimulus will be larger but also that the BIS and EMG display increased variability.

The CVI is based on the standard deviation of BIS and EMG (sBIS and sEMG). It combines sBIS and sEMG into a single measure of variability ranging from 0 to 100. Preliminary data suggest a possible predictive effect of the initial change in CVI just prior to a patient movement.

In the current study we will measure CVI in ASA 1-3 patients during elective abdominal surgery under fentanyl/sevoflurane/epidural anesthesia. We will monitor patient movement as primary correlate to CVI and cardiovascular parameters as secondary correlates (eg, cardiac output, pulse transit time, blood pressure and heart rate).
- Main changes (audit trail)
- RECORD27-jan-2010 - 14-feb-2010

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