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Closed-loop Control of Anesthesia: Controlled Delivery of Remifentanil and Propofol (iControl-RP)

This study has been completed.
Sponsor:
ClinicalTrials.gov Identifier:
NCT01771263
First Posted: January 18, 2013
Last Update Posted: August 24, 2016
The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details.
Information provided by (Responsible Party):
Fraser Health
  Purpose

In closed-loop controlled anesthesia, feedback from a measure of the clinical effect is used to continuously adjust drug infusion rates. Anesthetic drugs are delivered at a variable rate that is personalized to the individual patient. The aim is to provide greater hemodynamic and respiratory stability, more stable depth of anesthesia, the ability to predict recovery and to administer a lower total dose of drug. Previous work in closed-loop control of intravenous anesthesia has focused on the titration of propofol in response to a depth of hypnosis (DOH) measure derived from the electroencephalogram (EEG).

The purpose of this pilot study is to evaluate iControl-RP, a system, which performs controlled delivery of both remifentanil and propofol infusions. iControl-RP allows either drug to be operated in any of 3 modes: closed-loop control based on feedback from an EEG measure supplied by NeuroSENSE (1); target-controlled infusion (TCI), based on previously-described pharmacokinetic (PK) and pharmacodynamic (PD) models; and conventional manual infusion, which require a weight-based dose setting.

A pilot two-phase study will be undertaken in a group of adult patients under the direct and immediate supervision of an experienced anesthesiologist. In Phase 1 (involving 50 study subjects), propofol will be administered in closed-loop mode and a remifentanil infusion will be administered based on a TCI. The data collected in this phase will be used to tune the controller parameters, which are initially based on previously published PKPD data. The controller performance will then be evaluated in phase 2 (involving 100 study subjects), in which both propofol and remifentanil will be administered in closed loop mode. In both phases, cases will be selected from those receiving propofol and remifentanil as anesthetic agents for routine surgical procedures.

The investigators aim to demonstrate that closed-loop control of anesthesia and analgesia based on EEG feedback is clinically feasible. This pilot study will help us take a significant step towards a controlled trial in which the clinical benefit of this method of closed-loop control of anesthesia can be assessed.


Condition Intervention
Anesthesia Device: iControl-RP

Study Type: Interventional
Study Design: Intervention Model: Single Group Assignment
Masking: None (Open Label)
Primary Purpose: Treatment
Official Title: Closed-loop Control of Anesthesia: Controlled Delivery of Remifentanil and Propofol

Resource links provided by NLM:


Further study details as provided by Fraser Health:

Primary Outcome Measures:
  • Depth of Hypnosis (WAVcns) [ Time Frame: Continually assessed throughout anesthesia ]
    Depth of hypnosis measurements will be used among other parameters to assess the feasibility of the system for delivery of propofol and remifentanil for anesthesia


Secondary Outcome Measures:
  • Time until induction complete (Tind) [ Time Frame: Beginning of anesthesia ]
    Time interval between propofol infusion commencing and the depth of hypnosis remaining below 60 WAVcns units for more than 30 seconds


Enrollment: 150
Study Start Date: February 2013
Study Completion Date: December 2015
Primary Completion Date: December 2015 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
iControl-RP
iControl-RP is a system which performs controlled delivery of both remifentanil and propofol infusions.
Device: iControl-RP

  Hide Detailed Description

Detailed Description:

Purpose:

The purpose of this pilot study is to demonstrate that controlled delivery of remifentanil and propofol is clinically feasible and to collect a sample of clinical data to optimise the control functions. That is,

to demonstrate that the iControl remifentanil-propofol control system (iControl-RP) can be used to provide safe and effective administration of anesthesia (while maintaining the requirement for intervention by the anaesthesiologist when necessary) to collect a sample of clinical data that will allow the ECEM engineers to optimise the parameters of the iControl-RP control system

Justification:

Closed-loop control provides an opportunity to deliver anesthetic drugs at variable rate that is personalized to the individual patient. This suggests that it may provide greater hemodynamic and respiratory stability, more stable depth of anesthesia, the ability to predict recovery and to administer a lower total dose of drug.

Much development work is still required to mesh closed-loop control technology with anesthetic practice. The results of this initial study will feed into a subsequent larger study wherein the clinical, operational and economic benefits of closed-loop control of anesthesia will be submitted to a controlled trial.

Objectives:

The primary objective of this pilot study is to demonstrate the feasibility of closed-loop control of the delivery of both propofol and remifentanil using DOH feedback from the NeuroSENSE and show that it is a safe and effective mechanism for the administration of anesthesia and analgesia in adult patients undergoing routine elective surgical procedures. The secondary objective of this pilot study is to collect a sample of clinical data to optimise the tuning parameters for this system.

Research Method:

A pilot two-phase study will be undertaken in a group of adult patients under the direct and immediate supervision of an experienced anesthesiologist:

Phase 1: tuning controller parameters Propofol infusion will be closed-loop controlled; remifentanil will run as a target-controlled infusion (TCI); this system is comparable to the system evaluated in adult patients at the Hôpital Foch, Franc. The goal of this phase is to collect data to validate the mid-ranging controller design, which is based on population-based PKPD models.

Phase 2: evaluating controller performance The mid-ranging control system will be evaluated; both propofol and remifentanil infusion rates will be closed-loop controlled.

In both phases, cases will be selected from among patients who would be receiving propofol and remifentanil as the anesthetic agents for the planned procedure.

Research procedures will be similar in the two study phases. The anesthesiologist will closely monitor the patient as per routine practice and have the ability, at any time, to modify the anesthetic/analgesic drugs being administered. That is, he/she will be able to adjust the target DOH effect; adjust the target effect site concentration for remifentanil; immediately switch to manual control of either infusion; administer a bolus dose or immediately stop the infusion of either drug.

Investigational device iControl-RP has been developed for this study by the ECEM group at UBC headed by Prof. Dumont. iControl-RP is a control system developed for automatic closed-loop drug delivery in anesthesia. In this study remifentanil will be used as the fast actuator (control of analgesia) and propofol will be use as the slow actuator (control of hypnosis). Remifentanil is used to counteract disturbances in the measured DOH related to insufficient analgesia and propofol is used to maintain a stable baseline DOH. iControl-RP is connected to the NeuroSENSE, 2 infusion pumps for separately-controlled propofol and remifentanil administration, and the operating room (OR) patient monitor. It has a user interface, which displays the WAVCNS, infusion rates and effect site concentrations for both propofol and remifentanil. The user interface allows the anesthesiologist to set the target WAVCNS, to switch between modes of operation (manual, TCI, closed-loop) and set manual infusion rates or target effect-site concentrations for either drug, as required.

The system has been extensively tested in the laboratory for usability, reliability and repeatability. The vital signs collected from the OR patient monitor provide information for safety alerts.

Health Canada Investigational approval is being sought and will be received before commencement of study.

How the system works iControl-RP controls the infusion rates of a propofol infusion pump (Alaris TIVA) and a remifentanil infusion pump (Graseby 3400). The system allows either drug infusion to be operated in any of 3 modes: closed-loop control, which relies on WAVCNS feedback from the NeuroSENSE; TCI, which is based on PKPD models; and manual, which requires a weight-based dose setting (.e.g in mcg/kg/min).

  Eligibility

Information from the National Library of Medicine

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Ages Eligible for Study:   19 Years and older   (Adult, Senior)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No
Criteria

Inclusion Criteria:

  • 19 years of age or older
  • ASA I-III
  • Elective surgical procedures performed in the operating room at Royal Columbian Hospital requiring TIVA
  • Ability to provide informed consent

Exclusion Criteria:

  • Contra-indications to the administration of propofol and/or remifentanil:

propofol is contraindicated in patients with allergies to eggs, egg products, soybeans or soy products; remifentanil is contraindicated in patients with known hypersensitivity to fentanyl analogs.

  • Known or suspected neurological disease
  • Known abnormality in any previous EEG examination
  • Chronic opioid analgesic (more than 10 doses in previous one month) or other sedative drug therapy
  • Body Mass Index (BMI) < 15 or BMI > 45
  • Premedication other than metoclopramide and/or ranitidine required
  • Currently enrolled in another drug or device clinical trial
  Contacts and Locations
Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT01771263


Locations
Canada, British Columbia
Royal Columbian Hospital
New Westminster, British Columbia, Canada, V3L 3W7
Sponsors and Collaborators
Fraser Health
Investigators
Principal Investigator: Richard Merchant Royal Columbian Hospital and University of British Columbia
  More Information

Additional Information:
Responsible Party: Fraser Health
ClinicalTrials.gov Identifier: NCT01771263     History of Changes
Other Study ID Numbers: FHREB 2012-056
First Submitted: January 15, 2013
First Posted: January 18, 2013
Last Update Posted: August 24, 2016
Last Verified: August 2014

Keywords provided by Fraser Health:
Anesthesia
Propofol
Remifentanil
NeuroSENSE

Additional relevant MeSH terms:
Anesthetics
Propofol
Remifentanil
Central Nervous System Depressants
Physiological Effects of Drugs
Hypnotics and Sedatives
Anesthetics, Intravenous
Anesthetics, General
Analgesics, Opioid
Narcotics
Analgesics
Sensory System Agents
Peripheral Nervous System Agents