Conditions: Target Controlled Infusion (TCI) Thoracic Epidural Anesthesia Block Level Gastrointestinal Surgery
Keywords: effect-site concentration propofol thoracic epidural anesthesia
Allocation: RANDOMIZED | Intervention model: PARALLEL
Enrollment: 45
Healthy volunteers: no

Brief summary:
It is a prospective, randomized, placebo-controlled study to investigate the effect of TEA with different block level on propofol concentration during general anesthesia induction.

Detailed description:

Arms:
arm 1: epidural anesthesia with 1% lidocaine 10ml before propofol TCI arm 2: epidural anesthesia with 2% lidocaine 5ml before propofol TCI arm 3: epidural anesthesia with 0.9% normal saline 5ml before propofol TCI

Interventions: intervention 1: 1% lidocaine intervention 2: 2% lidocaine intervention 3: 0.9% normal saline
Intervention descriptions: intervention 1: epidural anesthesia with 1% lidocaine 10ml before propofol TCI intervention 2: epidural anesthesia with 2% lidocaine 5ml before propofol TCI intervention 3: epidural anesthesia with 0.9% normal saline 5ml before propofol TCI

Protocol document: