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Thoraco-abdominal Volume Variations During Anesthesia Studied by OEP.

This study has been completed.
Politecnico di Milano
Information provided by (Responsible Party):
Peter Kostic, Uppsala University Hospital Identifier:
First received: November 8, 2011
Last updated: December 5, 2014
Last verified: December 2014
The aim of this study is to examine chest wall volume changes monitored by opto-electronic plethysmography during recovery from anesthesia and early postoperative period.

Condition Intervention
Mechanical Ventilation
Procedure: lung recruitment maneuver

Study Type: Interventional
Study Design: Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Single Blind (Participant)
Primary Purpose: Prevention
Official Title: Thoraco-abdominal Volume Variation During Recovery From Total Intravenous Anesthesia Studied by Opto-electronic Plethysmography (OEP).

Resource links provided by NLM:

Further study details as provided by Uppsala University Hospital:

Primary Outcome Measures:
  • Opto-electronic plethysmography (OEP) [ Time Frame: 1. 5 min after each of these steps: the onset of the mechanical ventilation, the randomization, the end of the surgery 2. continuously during recovery 3. one hour after extubation ]
    Respiratory movements and thoracic and abdominal volume changes is recorded continuously using OEP (OEP system, BTS,Milan, Italy) by analysing the movements of retro-reflective markers using six video cameras connected to an automatic optoelectronic motion analyser.

Secondary Outcome Measures:
  • Functional residual capacity (FRC) [ Time Frame: 5 min after each of these steps: the onset of mechanical ventilation, the randomization, the end of the sergery ]
  • Oxygenation (paO2) [ Time Frame: 5 min after each of these steps: the onset of mechanical ventilation, the randomization, the end of the surgery, extubation ]
    Arterial blood gas measurement.

Enrollment: 18
Study Start Date: November 2011
Study Completion Date: November 2012
Primary Completion Date: June 2012 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Active Comparator: open lung
The lung recruitment maneuver (RM) immediately after intubation using pressure controlled ventilation, increase in peak inspiratory pressure up to 30 cm H2O during tidal ventilation, respiratory rate 4/min and positive end expiratory pressure (PEEP) 15 cm H20. PEEP 7 cm H2O until extubation. Inspiratory oxygen concentration (FiO2) 40% during recovery from anesthesia.
Procedure: lung recruitment maneuver
RM: peak inspiratory pressure 30 cmH2O, PEEP 15 cm H20 FiO2 0,4 (from end of surgery till extubation)
No Intervention: control
No recruitment maneuver is performed. PEEP 0 cm H2O. Inspiratory oxygen concentration (FiO2) 100 % during recovery from anesthesia.

Detailed Description:

This is prospective, randomized clinical trial in subjects undergoing elective surgery requiring general anesthesia.

Opto-electronic plethysmography (OEP) has been developed as a non-invasive method for the analysis of chest wall motion, allowing highly accurate measurements of chest wall volume changes of different respiratory compartments in various conditions.

The investigators set out to use this technology to study chest wall volume changes during recovery from total intravenous anesthesia (from discontinuing the anesthetic agent till extubation) and early postoperative period.

The study protocol compares two different approaches:

  1. The group receiving recruitment maneuver (RM) immediately after intubation and positive end expiratory pressure (PEEP) 7 cm H20 until extubation. Inspiratory oxygen concentration 40% during recovery from anesthesia.
  2. The group not receiving RM, PEEP 0 cm H2O and inspiratory oxygen concentration 100% during recovery from anesthesia.

The volume changes of the chest wall is monitored continuously by OEP, functional residual capacity (FRC) and arterial oxygenation are measured at the defined points in the protocol.


Ages Eligible for Study:   18 Years to 80 Years   (Adult, Senior)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • age > 18 years
  • ASA classification I-II, scheduled for elective surgery requiring general anesthesia
  • signed informed consent

Exclusion Criteria:

  • BMI > 35
  • co-existing respiratory disease (COPD, asthma )
  • patient refusal
  • pregnancy
  • deformities of the thorax
  Contacts and Locations
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Please refer to this study by its identifier: NCT01474850

Uppsala University Hospital, Anesthesia and Intensive care dep.
Uppsala, Sweden, 751 85
Sponsors and Collaborators
Uppsala University Hospital
Politecnico di Milano
Principal Investigator: Peter Frykholm Uppsala University Hospital
  More Information

Responsible Party: Peter Kostic, Staff anesthesiologist, Uppsala University Hospital Identifier: NCT01474850     History of Changes
Other Study ID Numbers: Uppsala 2011 - 190
Study First Received: November 8, 2011
Last Updated: December 5, 2014

Keywords provided by Uppsala University Hospital:
mechanical ventilation
pressure control ventilation
lung recruitment
positive end expiratory pressure
opto-electronic plethysmography
chest wall volume variation
intravenous anesthesia

Additional relevant MeSH terms:
Central Nervous System Depressants
Physiological Effects of Drugs processed this record on May 22, 2017