NCT00434382

Neuronal Mechanisms of Sensory Processing During General Anesthesia

Neuronale Mechanismen Der Sensorischen Reizverarbeitung in Der Narkose

• Status: Unknown
• Phase: N/A
• Study type: Interventional
• Enrollment: 768 (planned)
• Sponsor: Ludwig-Maximilians - University of Munich · Academic / Other
• Sex: All
• Age: 18 Years – 65 Years
• Healthy volunteers: Not accepted

Summary

The ability of Mid Latency Auditory Evoked Potentials for a routine monitoring of sensory suppression should be evaluated during a wide spectrum of clinically common forms general anesthesia.

Detailed description

Up to now there is no fully functional and precise technique for accurate assessment for monitoring the degree of unconsciousness during general anaesthesia. Previous studies and results obtained during the project regarding the effect of anaesthetics on single neurons and small neuronal networks indicate that it would be most promising to use a method directly correlating to the integrity of the relevant functional systems. As one goal of the project it was formulated to develop and test a new system for recording and analysis of mid latency auditory evoked potentials (MLAEP), suitable to be used in the clinical surrounding of an operation theatre. Step by step an investigational system was developed, that after obtaining legal approvement was functional in a broad spectrum of cases. In a multicenter study the including 4 clinical centres and 426 patients the reliability of the system was proved. Even under the hard conditions of the OR the apparatus was able to record the signals with sufficient reliability and precision. A clear correlation of MLAEP parameters with clinically defined states of consciousness could be identified. Differences in the effect of the used combinations of general anaesthetics and opioids were identified. An algorithm for automatic analysis of the signals was developed, to allow users with limited knowledge of interpretation of MLAEP signals to use them for monitoring anaesthesia.

Conditions

• General Anesthesia

Interventions

Type	Name	Description
DRUG	Sevoflurane
DRUG	Isoflurane
DRUG	Desflurane
DRUG	Propofol
DRUG	Fentanyl
DRUG	Sufentanil
DRUG	Alfentanil
DRUG	Remifentanil
DEVICE	Midlatency auditory evoked potentials

Timeline

• Start date: 2002-10-01
• Completion: 2003-12-01
• First posted: 2007-02-13
• Last updated: 2010-07-30

Locations

4 sites across 1 country: Germany