The Effect on the Older's Cognition of Dual-loop Target Controlled Infusion Guided by Narcotrend Index

Guangzhou General Hospital of Guangzhou Military Command60 enrolled

Overview

To investigate the effect on older's cognition of the application of closed target-controlled infusion(TCI) of propofol and remifentanil guided by Narcotrend index .

Two hundreds of patients scheduled for surgery under general anesthesia were randomly divided into two groups:closed-loop (group A,n=100) and open-loop group(group B,n=100).The procedure during induction of anesthesia was same in two groups.In group A,if Narcotrend index(NI) fall down to 46 and keep more than 30 seconds,propofol and remifentanil were intravenously infused as feedback automatically to achieve the target NI of 26-46.However,the NI in group B was controlled manually.Taking an exam of MMSE before and after the surgery which measures if the older's cognition changed. Furthermore.we will measure the levels of protein S100beta and NSE.

Study Type

INTERVENTIONAL

Allocation

RANDOMIZED

Purpose

TREATMENT

Masking

NONE

Enrollment

Conditions

Anesthesia

Interventions

Dual-Loop TCIDEVICE

the investigator modified the effect-site target concentrations by NI.If NI fall down to 46 and keep 46 more than 30 seconds,propofol and remifentanil were infused as feedback automatically to achieve the target NI of 26-46

Open-Loop TCIDEVICE

the investigator modified the effect-site target concentrations of both drugs without minimum or maximum concentration limits without using the Narcotrend monitor only depend on the experience of anesthesiologist.

Eligibility

Sex: ALLMin age: 60 YearsMax age: 80 YearsHealthy volunteers:

Medical Language ↔ Plain English

Inclusion Criteria: 1. ASA Ⅰ \~ Ⅱ women undergoing Laparoscopic surgery. 2. Written informed consent from the patient or the relatives of the participating patient. 3. BMI:18.0～25 kg/m2 Exclusion Criteria: 1. Mental illness can not match 2. epidural anesthesia contraindicated 3. People who have Slow-type arrhythmias 4. Chronic renal failure 5. Alcohol or drug abuse 6. Already taking gabapentin, pregabalin, benzodiazepin or antidepression dru

Locations (1)

Guangzhou Military Region General Hospital, Department of Anesthesiology

Guangzhou, Guangdong, China

Outcomes

Primary Outcomes

MMSE scores

The Mini-Mental State Examination (MMSE) or Folstein test is a 30-point questionnaire that is used extensively in clinical and research settings to measure cognitive impairment.It is commonly used in medicine and allied health to screen for dementia. It is also used to estimate the severity and progression of cognitive impairment and to follow the course of cognitive changes in an individual over time; thus making it an effective way to document an individual's response to treatment. The MMSE's purpose has been not, on its own, to provide a diagnosis for any particular nosological entity.We measure the patient before the operation and the first/third/seventh day after the operation.

Time frame: up to 1 week

Secondary Outcomes

protein s100beta

The calcium-binding protein S100b is enriched in astroglial cells and can cross the blood-brain barrier after hypoxic damage of the central nervous system. Its routine measurement is simple and relatively inexpensive. S100b is filtrated by the kidney and has an estimated half-life of 2 h . Its serum level increases after CA, and its prognostic value has been studied . Because of mitigated results, its routine use has been, up to now, not recommended. S100bata is normally 0.2μg/L in serum or more smaller.We decide to take the blood sample before the operation and after the operation when the patient is awake.

Time frame: up to 24 hours

Data from ClinicalTrials.gov

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