Comparison of Oxidative Stress Changes in Different Ventilation Strategies During Gynecologic Laparoscopic Surgery

July 30, 2015 updated by: Chang Gung Memorial Hospital

Ischemia-reperfusion injury resulted from pneumoperitoneum during laparoscopic surgery have been reported in some literatures. There are no studies investigating the time course of changes in oxidative stress markers in volume-controlled ventilation (VCV) and pressure-controlled ventilation (PCV) modes. The aim of this study is to compare the alterations in oxidative stress in two different ventilation strategies during gynecologic laparoscopic surgery.

Methods:

Fifty-two patients of ASA physical status I or II were randomly assigned to receive either VCV or PCV during laparoscopic gynecologic surgery. Blood gas analysis and ventilation variables were recorded 1 minute before (T1) and 1 hour after (T2) pneumoperitoneum. Blood samples for malondialdehyde (MDA) measurement were collected at seven points: 1 minute before (T1) and 1 hour after (T2) pneumoperitoneum; 30 minutes, 60 minutes, 90 minutes, and 120 minutes after deflation (T3~T6); and 24 hours after deflation (T7).

Study Overview

Status

Status

Indicates the current recruitment status or the expanded access status.
Completed

Conditions

Conditions

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Intervention / Treatment

Intervention / Treatment

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Detailed Description

Pneumoperitoneum during laparoscopic procedures greatly impairs splanchnic blood flow due to compression. Increased intra-abdominal pressure may elevate the diaphragm, increase intra-thoracic pressure, reduce functional residual capacity, and thus lead to atelectasis. In a collapsed lung, blood flow is decreased and reperfusion injury may subsequently occur during re-expansion of the lung. This ischemia-reperfusion injury results from the formation of reactive oxygen species (ROS), which are highly reactive intermediates of the oxygen metabolism. When there is an imbalance between ROS generation and removal by antioxidative mechanisms, oxidative stress occurs and eventually causes cellular and organ damage. Oxidative stress mediates tissue injury and may represent an important link between laparoscopy and clinical side effects. Malondialdehyde (MDA) is considered the most reliable marker of oxidative stress in the clinical setting. It is a breakdown product of lipid peroxidation in tissues. An elevated concentration of MDA reflects the level of lipid peroxidation.

Although there is abundant data comparing the effects of VCV and PCV during laparoscopic surgery, the time course of changes in oxidative stress in these two modes has not been elucidated. Therefore, the aim of this study was to compare the alterations of oxidative stress in two different ventilation modes, VCV and PCV, during gynecologic laparoscopic surgery. To this end, the investigators established a prospective randomized clinical study and measured the plasma levels of a lipid peroxidation marker at different stages.

Fifty-two patients of ASA physical status I or II were randomly assigned to receive either VCV or PCV during laparoscopic gynecologic surgery. During the operation, blood gas analysis and ventilation variables were recorded 1 minute before (T1) and 1 hour after (T2) the establishment of CO2 pneumoperitoneum in both groups. Blood samples for MDA measurement were collected at seven points: 1 minute before (T1) and 1 hour after (T2) pneumoperitoneum; at intervals of 30 minutes for 2 hours after the deflation of CO2 (T3~T6); and 24 hours after the deflation of CO2 (T7). The samples were immediately centrifuged (1000g, 10 minutes) and the supernatants were stored at -800C until further analysis, which took place within 1 week. The investigators assessed the quality of recovery from anesthesia using a nine-item quality of recovery score (QoR Score) before operation and 24 hours after the deflation of CO2.

Study Type

Study Type

Describes the nature of a clinical study. Study types include interventional studies (also called clinical trials), observational studies (including patient registries), and expanded access.
Interventional

Enrollment (Actual)

Enrollment

The number of participants in a clinical study. The "anticipated" enrollment is the target number of participants that the researchers need for the study.
52

Phase

Phase

The stage of a clinical trial studying a drug or biological product, based on definitions developed by the U.S. Food and Drug Administration (FDA). The phase is based on the study's objective, the number of participants, and other characteristics. There are five phases: Early Phase 1 (formerly listed as Phase 0), Phase 1, Phase 2, Phase 3, and Phase 4. Not Applicable is used to describe trials without FDA-defined phases, including trials of devices or behavioral interventions.
  • Not Applicable

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • Taiwan
      • Taoyuan, Taiwan, 333
        • Department of Anesthesiology, Chang Gung Memorial Hospital

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Eligibility Criteria

The key requirements that people who want to participate in a clinical study must meet or the characteristics they must have. Eligibility criteria consist of both inclusion criteria (which are required for a person to participate in the study) and exclusion criteria (which prevent a person from participating). Types of eligibility criteria include whether a study accepts healthy volunteers, has age or age group requirements, or is limited by sex.

Ages Eligible for Study

20 years to 70 years (Adult, Older Adult)

Accepts Healthy Volunteers

Yes

Genders Eligible for Study

Female

Description

Inclusion Criteria:

  • aged between 20 and 70 years with a BMI < 30 kg/m2 scheduled for laparoscopic gynecologic surgery requiring at least 1 hour of pneumoperitoneum

Exclusion Criteria:

  • cardiopulmonary disease and a history of sepsis or shock, findings suspicious of malignant disease, previous major abdominal operation, smoking, and recent antioxidant use (i.e. vitamins A, C and E).

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Prevention
  • Allocation: Randomized
  • Interventional Model: Parallel Assignment
  • Masking: Single

Arms and Interventions

Participant Group / Arm

Participant Group / Arm

A group or subgroup of participants in a clinical trial that receives a specific intervention/treatment, or no intervention, according to the trial's protocol.
Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.
Active Comparator: Volume-controlled ventilation
Volume-controlled ventilation throughout the surgery
Procedure: Volume-controlled ventilation
a tidal volume of 8 ml/kg
Active Comparator: Pressure-controlled ventilation
Pressure-controlled ventilation throughout the surgery
Procedure: Pressure-controlled ventilation
a peak airway pressure to maintain a tidal volume of 8 ml/kg

What is the study measuring?

Primary Outcome Measures

Primary Outcome Measures

In a clinical study's protocol, the planned outcome measure that is the most important for evaluating the effect of an intervention/treatment. Most clinical studies have one primary outcome measure, but some have more than one.
Outcome Measure
Measure Description
Time Frame
peak airway pressure
Time Frame: 1 hour after the establishment of CO2 pneumoperitoneum
During surgery, CO2 pneumoperitoneum was induced with an intraabdominal pressure of 15 mmHg. After one hour of pneumoperitoneum, ventilation variables were recorded.
1 hour after the establishment of CO2 pneumoperitoneum

Secondary Outcome Measures

Secondary Outcome Measures

In a clinical study's protocol, a planned outcome measure that is not as important as the primary outcome measure for evaluating the effect of an intervention but is still of interest. Most clinical studies have more than one secondary outcome measure.
Outcome Measure
Time Frame
plasma MDA concentration
Time Frame: 1 minute before (T1) and 1 hour after (T2) pneumoperitoneum; at intervals of 30 minutes for 2 hours after the deflation of CO2 (T3~T6); and 24 hours after the deflation of CO2 (T7)
1 minute before (T1) and 1 hour after (T2) pneumoperitoneum; at intervals of 30 minutes for 2 hours after the deflation of CO2 (T3~T6); and 24 hours after the deflation of CO2 (T7)

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Sponsor

The organization or person who initiates the study and who has authority and control over the study.
Chang Gung Memorial Hospital

Investigators

Investigators

A researcher involved in a clinical study. Related terms include site principal investigator, site sub-investigator, study chair, study director, and study principal investigator.
  • Principal Investigator: Chia-Chih Liao, MD, Chang Gung Memorial Hospital

Publications and helpful links

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General Publications

Study record dates

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Study Major Dates

Study Start

Study Start

The actual date on which the first participant was enrolled in a clinical study. The "anticipated" study start date is the date that the researchers think will be the study start date.
May 1, 2013

Primary Completion (Actual)

Primary Completion

The date on which the last participant in a clinical study was examined or received an intervention to collect final data for the primary outcome measure. Whether the clinical study ended according to the protocol or was terminated does not affect this date. For clinical studies with more than one primary outcome measure with different completion dates, this term refers to the date on which data collection is completed for all the primary outcome measures. The "anticipated" primary completion date is the date that the researchers think will be the primary completion date for the study.
August 1, 2013

Study Completion (Actual)

Study Completion

The date on which the last participant in a clinical study was examined or received an intervention/treatment to collect final data for the primary outcome measures, secondary outcome measures, and adverse events (that is, the last participant's last visit). The "anticipated" study completion date is the date that the researchers think will be the study completion date.
July 1, 2014

Study Registration Dates

First Submitted

First Submitted

The date on which the study sponsor or investigator first submitted a study record to ClinicalTrials.gov. There is typically a delay of a few days between the first submitted date and the record's availability on ClinicalTrials.gov (the first posted date).
July 6, 2015

First Submitted That Met QC Criteria

First Submitted That Met QC Criteria

The date on which the study sponsor or investigator first submits a study record that is consistent with National Library of Medicine (NLM) quality control (QC) review criteria. The sponsor or investigator may need to revise and submit a study record one or more times before NLM's QC review criteria are met. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
July 30, 2015

First Posted (Estimate)

First Posted

The date on which the study record was first available on ClinicalTrials.gov after National Library of Medicine (NLM) quality control (QC) review has concluded. There is typically a delay of a few days between the date the study sponsor or investigator submitted the study record and the first posted date.
July 31, 2015

Study Record Updates

Last Update Posted (Estimate)

Last Update Posted

The most recent date on which changes to a study record were made available on ClinicalTrials.gov. There may be a delay between when the changes were submitted to ClinicalTrials.gov by the study's sponsor or investigator (the last update submitted date) and the last update posted date.
July 31, 2015

Last Update Submitted That Met QC Criteria

Last Update Submitted That Met QC Criteria

The most recent date on which the study sponsor or investigator submitted changes to a study record that are consistent with National Library of Medicine (NLM) quality control (QC) review criteria. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
July 30, 2015

Last Verified

Last Verified

The most recent date on which the study sponsor or investigator confirmed the information about a clinical study on ClinicalTrials.gov as accurate and current. If a study with a recruitment status of recruiting; not yet recruiting; or active, not recruiting has not been confirmed within the past 2 years, the study's recruitment status is shown as unknown.
July 1, 2015

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

Other Study ID Numbers

Identifiers or ID numbers other than the NCT number that are assigned to a clinical study by the study's sponsor, funders, or others. These numbers may include unique identifiers from other trial registries and National Institutes of Health grant numbers.
  • CGMH-IRB-102-0112A3

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