Closed-Loop Target Controlled Infusion in Laparoscopic Cholecystectomy (CLTCI)

Guangzhou General Hospital of Guangzhou Military Command

Status and phase: Unknown; Phase 4

Conditions: Cholecystolithiasis

Treatments: Device: Opened-loop TCI; Device: Closed-loop TCI

Study type: Interventional

Funder types: Other

Identifiers

NCT02114437

Closed-Loop

Details and patient eligibility

About

Laparoscopic Cholecystectomy applied to Artificial pneumoperitoneum and the extent of Surgical stimulation cause the wave of hemodynamics increase vigorously, which make it difficult to judge the depth of anesthesia according to traditional hemodynamics index such as heart rate and blood pressure.In case of this, the investigators design this research to study the Closed-Loop Target Controlled Infusion to anaesthesia of individualization guided by a Narcotrend index monitor in Laparoscopic Cholecystectomy.

Full description

Anesthetics alter electrocortical activity in a dose-dependent manner,and it is suggested that electroencephalographic(EEG)activity can provide a reliable basis for a surrogate measurement of hypnosis.An EEG monitor,the Narcotrend Index(NI),has proven useful to titrate hypnotic drugs.Because it is a single composite measure monitored continuously,it has been used in controlled studies to automatically guide propofol administration.Conversely,automated delivery systems for opioids have seldom been described using EEG activity There are no specific measures to quantify analgesia directly.Nevertheless,in the interaction between opioid-hypnotic synergy and loss of consciousness,when the dose of analgesic administered is sufficient to inhibit autonomic response to noxious stimuli,then the required hypnotic concentration is only that needed to achieve loss of consciousness.Moreover,a noxious stimulus such as laryngoscopy or periosteal pressure to the tibia may cause electrocortical activation with an increase in Narcotrend index,which indirectly reflects the analgesic state or the level of antinociception.Finally,an excitatory EEG arousal reaction resulting from nociceptive stimulation can provide a rational basis for analgesia administration.It can then be hypothesized that Narcotrend index could also be the controlled variable for opioid administration.

Enrollment: 38 estimated patients

Sex: All

Ages: 18 to 90 years old

Volunteers: Accepts Healthy Volunteers

Inclusion criteria

1. require general anesthesia
2. expected to last>30 minutes
3. 18~90 years
4. ASA Ⅰ~Ⅳ level

Exclusion criteria

1. psychiatric illness
2. supraspinal neurological disorders
3. cranial neurosurgical procedures
4. patients equipped with a pacemaker

Trial design

Primary purpose: Supportive Care

Allocation: Randomized

Interventional model: Single Group Assignment

Masking: None (Open label)

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38 participants in 2 patient groups, including a placebo group

Closed-loop TCI

Experimental group

Description:

the controller in the current study measures and calculates the error(NI error),which is the difference between the set point(NI=36)and the measured NI.If the NI error is different from 0,the controller determines a new propoflo and/or remifentanil concentration.

Treatment:

Device: Closed-loop TCI

Opened-loop TCI

Placebo Comparator group

Description:

the investigator modified the effect-site target concentrations of both drugs without minimum or maximum concentration limits to maintain NI at approximately 36 within a range of 26 to 46 to the extent possible.

Treatment:

Device: Opened-loop TCI