Monitor-Guided Analgesia During General Anesthesia - Part I (MOGADA)

Investigation of the Effect of Opioid Titration Guided by Analgesia Indices During General Anesthesia

This prospective randomized clinical trial evaluates the effects of a monitor-guided opioid analgesia during general anesthesia. To date no standard-monitoring device exists to specifically reflect the analgesic component of general anesthesia. Quality and safety of general anesthesia are of major clinical importance and should be improved by limiting the opioid analgesic's dosage to the minimum amount needed. The study compares the effects of monitoring nociception during general anesthesia with different innovative techniques in comparison to routine clinical practice.

Study Overview

• Status: Completed
• Conditions: Pain; Pain, Postoperative; Analgesia; Opioid Use; Nociceptive Pain
• Intervention / Treatment: Procedure: Opioid administration in intervention groups; Procedure: Opioid administration in control group

Detailed Description

This prospective randomized clinical study aims to investigate the effects of a monitor-guided opioid analgesia during general anesthesia by different monitoring systems in comparison to routine clinical practice. Many surgical procedures require general anesthesia. The main components of general anesthesia are hypnosis and analgesia, and anesthesiologists usually combine a hypnotic drug with an opioid analgesic.

Until today, however, there is no standard-monitoring of nociception to specifically reflect the analgesic component of general anesthesia. In clinical practice the opioid dosage is chosen by clinical judgment of the attending anesthesiologist based upon changes of heart rate, blood pressure, pupil size, lacrimation and sweating of the patient.

On the one hand, underdosage of opioids can cause nociception leading to an increased sympathetic tone, increase of plasma levels of stress hormones, nociceptive movements as well as increase postoperative pain. On the other hand, overdosage of opioids can lead to drug side effects such as nausea and vomiting, hemodynamic instability, an increase in recovery times, immunosuppression and an increase in postoperative pain by opioid-induced-hyperalgesia. Quality and safety of general anesthesia are of major clinical importance and can be improved by limiting the administration of opioid analgesics to the optimal individual dose needed. In the last years, different analgesia monitoring devices have been developed for monitoring nociception. The present study evaluates the effects of the administration of opioids during general anesthesia guided by three different monitoring systems in comparison to routine clinical practice. After institutional approval by the Ethics committee of the Medical Board of the City of Hamburg, Germany and obtaining patients' written informed consent the investigators randomize elective patients with major abdominal surgery for open radical prostatectomy into one of four treatment groups.

• Study Type: Interventional
• Enrollment (Actual): 48
• Phase: Not Applicable

Contacts and Locations

Study Locations

• Germany
  • Hamburg, Germany, 20257
    • Department of Anesthesiology; Center of Anesthesiology and Intensive Care Medicine, Hamburg Eppendorf University Medical Center

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 18 years and older (ADULT, OLDER_ADULT)
• Accepts Healthy Volunteers: No
• Genders Eligible for Study: Male

Description

Inclusion Criteria:

• Radical open abdominal prostatectomy scheduled in the operation theater where the study is conducted
• > 18 years

Exclusion Criteria:

• Chronic pain therapy, e.g. out-of-hospital opioid therapy
• Beta blocker and digitalis therapy
• Eye disease with affection of pupil reactivity
• Pacemaker therapy
• Higher degrees of cardiac arrhythmias, e.g. atrial fibrillation
• Pre-operative medication with steroids

Study Plan

How is the study designed?

Design Details

• Primary Purpose: TREATMENT
• Allocation: RANDOMIZED
• Interventional Model: PARALLEL
• Masking: DOUBLE

Number of Arms

4

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
EXPERIMENTAL: PPI (Pain Pupillary Index); Opioid administration guided by Pain Pupillary Index (PPI) derived from Videopupillometry performed with the device AlgiScan manufactured by IDMed, Marseille, France. The device measures the degree of pupillary reflex dilation (PRD) following an electric nociceptive stimulation. It automatically increases the intensity of the electric stimulation from 10 to 60 milliampere depending on the degree of PRD and afterwards displays the PPI. The numerical index ranges from 0 to 10. A low PPI score indicates a deep analgesia, a high PPI score indicates an insufficient or light analgesia. A PPI score of 2 or 3 is supposed to represent an optimal level of analgesia according to the manufacturer. 5 µg sufentanil will be administered every 5 minutes if PPI score is calculated more than 3.	Procedure: Opioid administration in intervention groups; Elective surgery in radical open abdominal prostatectomy. Opioid titration is guided by analgesia indices during general anesthesia in the experimental arms.
EXPERIMENTAL: SPI (Surgical Pleth Index); Opioid administration (sufentanil) guided by by Surgical Pleth Index (SPI) derived from photoplethysmography performed by the device CARESCAPE B650 Patient Monitor from the manufacturer GE (General Electrics) Healthcare, Helsinki, Finland. Included in the monitoring system is a software that continuously calculates the SPI from normalized heart rate and pulse wave amplitude derived from finger plethysmography. The numerical index ranges between 0 (low sympathetic tone) and 100 (high sympathetic tone). A SPI score between 20 and 50 has been proposed as the target range to guide analgesics (15 - 17). 5 µg Sufentanil will be administered every 5 minutes if SPI score is calculated more than 50.	Procedure: Opioid administration in intervention groups; Elective surgery in radical open abdominal prostatectomy. Opioid titration is guided by analgesia indices during general anesthesia in the experimental arms.
EXPERIMENTAL: NOL (Nociception Level); Opioid administration (sufentanil) guided by Nociception Level (NOL) derived from finger photoplethysmography performed with the analgesia monitoring device PMD200 manufactured by Medasense, Ramat Gan, Israel. The device continuously calculates the NOL with a multi-parametric approach from pulse rate, pulse rate variability, pulse wave amplitude, skin conductance level, skin conductance fluctuations, skin temperature and finger motion. The composite algorithm of the device analyses the data and the numerical index NOL is presented on a scale from 0 (no pain) to 100 (extreme pain) (18). A NOL score between 10 and 25 has been proposed as the target range to guide analgesics. 5 µg Sufentanil will be administered every 5 minutes if NOL score is calculated more than 25.	Procedure: Opioid administration in intervention groups; Elective surgery in radical open abdominal prostatectomy. Opioid titration is guided by analgesia indices during general anesthesia in the experimental arms.
ACTIVE_COMPARATOR: Control; Opioid administration (sufentanil) guided according to standard clinical practice of the attending anesthesiologist based upon changes of heart rate, blood pressure, lacrimation and sweating of the patient.	Procedure: Opioid administration in control group; Elective surgery in radical open abdominal prostatectomy. Opioid titration is guided by clinical signs in the control group.

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Intraoperative opioid consumption	Compares the amount of intraoperative opioid administration (sufentanil) per minute of general anesthesia and per kg bodyweight between groups.	1 day

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Time to extubation	Postoperative recovery time: Time interval between end of operation and tracheal extubation of the patient.	1 day
Postoperative pain level	Postoperative pain level measured with the highest score in numeric pain rating scale (NRS).	1 day
Postoperative opioid administration	Amount of postoperative opioid administration (piritramid) in the postanesthesia care unit (PACU). Piritramid is given if NRS score is > 3.	1 day
Patient satisfaction	Patient satisfaction with the general anesthesia and pain management evaluated by a numeric rating scale.	2-21 days
Release of stress hormones	Amount of perioperative plasma level of cortisol and ACTH.	1 day
Time to fit-for-discharge	Postoperative recovery time: Time interval between postoperative tracheal extubation and the patient reaching fit-for-discharge criteria from the PACU to the ward.	1 day

Collaborators and Investigators

• Sponsor: Universitätsklinikum Hamburg-Eppendorf
• Investigators: Principal Investigator: Rainer Nitzschke, MD, Department of Anesthesiology; Center of Anesthesiology and Intensive Care Medicine, Hamburg Eppendorf University Medical Center; Principal Investigator: Sandra Funcke, MD, Department of Anesthesiology; Center of Anesthesiology and Intensive Care Medicine, Hamburg Eppendorf University Medical Center

Study record dates

Study Major Dates

• Study Start (ACTUAL): October 16, 2017
• Primary Completion (ACTUAL): December 5, 2017
• Study Completion (ACTUAL): January 26, 2018

Study Registration Dates

• First Submitted: August 28, 2017
• First Submitted That Met QC Criteria: October 2, 2017
• First Posted (ACTUAL): October 6, 2017

Study Record Updates

• Last Update Posted (ACTUAL): April 25, 2018
• Last Update Submitted That Met QC Criteria: April 24, 2018
• Last Verified: April 1, 2018

More Information

Terms related to this study

• Keywords: Analgesia, Monitoring, Opioid, Sufentanil, Sevoflurane
• Additional Relevant MeSH Terms: Pathologic Processes; Postoperative Complications; Pain; Neurologic Manifestations; Pain, Postoperative; Nociceptive Pain; Physiological Effects of Drugs; Central Nervous System Depressants; Peripheral Nervous System Agents; Analgesics; Sensory System Agents; Narcotics; Analgesics, Opioid
• Other Study ID Numbers: 20170824

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: NO
• IPD Plan Description: All data will be anonymized before publication.

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: No
• Studies a U.S. FDA-regulated device product: No