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Rebreathing of Carbon Dioxide With a Device Used for Giving Inhalational Anaesthesia

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. Identifier: NCT01339013
Recruitment Status : Completed
First Posted : April 20, 2011
Results First Posted : September 11, 2014
Last Update Posted : September 25, 2014
Information provided by (Responsible Party):
Region Skane

April 13, 2011
April 20, 2011
March 14, 2014
September 11, 2014
September 25, 2014
April 2011
January 2013   (Final data collection date for primary outcome measure)
Airway Dead Space With Devices for Heat and Moisture Exchange of Respiratory Gas. [ Time Frame: 1 hour ]
A conventional heat and moisture exchanger used in a respiratory circuit during anasthesia was exchanged by an AnaConDa. The AnaConDa causes re-breathing of carbon dioxide which clinically is equivalent to an increased airway dead space. The total airway dead space effect of the AnaConDa, i.e. volume of the device plus rebreathing from the charcoal filter was measured using the Single Breath Test for carbon dioxide, as was airway deadspace of the conventional Heat and Moisture Exchanger. Airway dead space differences between devices was calculated by subtraction of volumes thus achieved. Difference= Airway dead space AnaConDa - Airway dead space conventional Heat and Moisture Exchanger.
Quantification of ventilation requirements with the use of the AnaConDa rebreathing system for anesthetic gases [ Time Frame: 1 hour ]
Changes to tidal volume required to maintain constant alveolar ventilation will be assessed by continuous measurement of exhaled tidal carbon dioxide volume.
Complete list of historical versions of study NCT01339013 on Archive Site
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Rebreathing of Carbon Dioxide With a Device Used for Giving Inhalational Anaesthesia
Dead Space Effect of an Anaesthesia Gas Reflector (AnaConDa)
The anesthesia gas reflector (AnaConDa) is built on the adsorptive capacity of active carbon which also adsorbs carbon dioxide in exhaled air. Rebreathing of carbon dioxide thus occurs and must be compensated for by increased ventilation. This study aims at determining how much compensation must be given, based on the hypothesis that rebreathing depends on carbon dioxide level in blood and exhaled air.
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Intervention Model: Single Group Assignment
Masking: None (Open Label)
Primary Purpose: Basic Science
Anesthetic Ventilatory Requirements
Device: Anesthetic Conserving Device (AnaConDa )
Standard HME was replaced by AnaConDa. AnaConDa has charcoal filter, HME does not.
Active Comparator: AnaConDa
Intervention: Device: Anesthetic Conserving Device (AnaConDa )
Sturesson LW, Bodelsson M, Johansson A, Jonson B, Malmkvist G. Apparent dead space with the anesthetic conserving device, AnaConDa®: a clinical and laboratory investigation. Anesth Analg. 2013 Dec;117(6):1319-24. doi: 10.1213/ANE.0b013e3182a7778e.

*   Includes publications given by the data provider as well as publications identified by Identifier (NCT Number) in Medline.
January 2013
January 2013   (Final data collection date for primary outcome measure)

Inclusion Criteria:

  • elective coronary artery by-pass graft surgery
  • elective valve replacement surgery
  • normal left ventricular ejection fraction on preoperative echocardiography

Exclusion Criteria:

  • obstructive lung disease
  • restrictive lung disease
Sexes Eligible for Study: All
18 Years and older   (Adult, Senior)
Contact information is only displayed when the study is recruiting subjects
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Region Skane
Region Skane
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Principal Investigator: Mikael Bodelsson, Professor Division of Surgery, Department of Anaesthesia, Skane University Hospital, Lund, Sweden
Region Skane
September 2014

ICMJE     Data element required by the International Committee of Medical Journal Editors and the World Health Organization ICTRP