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Edmon (BBraun, Germany) is a portable, commercially available device for measurement of propofol in exhaled air.
The study will aim at evaluating the sensitivity and specificity of such exhaled propofol values compared with plasma propofol and measures of anaesthetic and antinociceptive effect.
Elective low-back surgery patients will be induced for general intubation anesthesia with propofol and remifentanil.
After induction a 20 min period of stable propofol infusion only will be established before start of surgery. The patients will be monitored for exhaled propofol, plasma propofol (blood samples), continous frontal EEG, Bispectral Index (BIS), skin conductance, estimated (computer based) concentrations of plasma and effect site propofol, and skin conductance.
After start of surgery (with ongoing propofol and restart of remifentanil TCI) the monitoring will continue in order to explore these relationships further.
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| Edmon arm | Experimental |
|
| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| Edmon | Device | Exhaled air will be analyzed for propofol |
|
| Measure | Description | Time Frame |
|---|---|---|
| Exhaled air versus plasma concentration | per-operative |
| Measure | Description | Time Frame |
|---|---|---|
| EEG recording | EEG will be recorded and compared with plasma propofol, exhaled propofol and BIS | per-operative |
| Exhaled propofol 2 | Exhaled propofol versus dose given, estimated plasma concentration, estimated effect site concentration |
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Inclusion Criteria:
Exclusion Criteria:
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| Name | Role | Phone | Extension | |
|---|---|---|---|---|
| Johan Raeder, PhD | Contact | 004792249669 | johan.rader@medisin.uio.no | |
| Torsten Eken, PhD | Contact | 004795079939 | torsten.eken@medisin.uio.no |
| Name | Affiliation | Role |
|---|---|---|
| Kristin S Thagaard, MD | Oslo University Hospital | Study Director |
| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| Dept of Anesthesiology, Oslo University Hospital, Ullevaal | Recruiting | Oslo | 0407 | Norway |
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The intervention is to have patients in 20 min stable anaesthesia before start of surgery in order to validate the use of exhaled propofol versus pharmakokinetic modelling and measured plasma concentration
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| per-operative |
| Nociceptive stimulation | Skin conductance versus plasma and exhaled propofol concentration | per-operative |