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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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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| AnaConDa | Active Comparator |
|
| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| Anesthetic Conserving Device (AnaConDa ) | Device | Standard HME was replaced by AnaConDa. AnaConDa has charcoal filter, HME does not. |
|
| Measure | Description | Time Frame |
|---|---|---|
| Airway Dead Space With Devices for Heat and Moisture Exchange of Respiratory Gas. | 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. | 1 hour |
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Inclusion Criteria:
Exclusion Criteria:
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| Name | Affiliation | Role |
|---|---|---|
| Mikael Bodelsson, Professor | Division of Surgery, Department of Anaesthesia, Skane University Hospital, Lund, Sweden | Principal Investigator |
| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| University Hospital, Cardiothoracic Intensive Care | Lund | SE-221 85 | Sweden |
| PubMed Identifier | Type | Citation | Retractions |
|---|---|---|---|
| 24257381 | Result | Sturesson LW, Bodelsson M, Johansson A, Jonson B, Malmkvist G. Apparent dead space with the anesthetic conserving device, AnaConDa(R): a clinical and laboratory investigation. Anesth Analg. 2013 Dec;117(6):1319-24. doi: 10.1213/ANE.0b013e3182a7778e. |
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All recruited patients participated uneventfully.
September 2011 to January 2013, Medical Clinic
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| ID | Title | Description |
|---|---|---|
| FG000 | AnaConDa Replaces the Heat and Moisture Exchanger | The conventional Heat and Moisture Exchanger is replaced by the AnaConDa which in turn is replaced by the conventional Heat and Moisture Exchanger. |
| Title | Milestones | Reasons Not Completed | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Overall Study |
|
A total of 6 patients participated. All 6 started with HME, then AnaConDa, finally HME
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| ID | Title | Description |
|---|---|---|
| BG000 | All Study Participants | Heat and Moisture Exchanger, then AnaConDa, finally Heat and Moisture Exchanger |
| Units | Counts |
|---|---|
| Participants |
|
| Title | Description | Population Description | Parameter Type | Dispersion Type | Unit of Measure | Calculate Percentage | Denominator Units Selected | Denominators | Classes |
|---|---|---|---|---|---|---|---|---|---|
| Age, Continuous | Median |
| Type | Title | Description | Population Description | Reporting Status | Anticipated Posting Date | Parameter Type | Dispersion Type | Unit of Measure | Calculate Percentage | Time Frame | Units Analyzed | Denominator Units Selected | Arm/Group Information | Denominators | Classes | Analyses | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Primary | Airway Dead Space With Devices for Heat and Moisture Exchange of Respiratory Gas. | 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. | Posted | Median | 95% Confidence Interval | mL | 1 hour |
|
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| ID | Title | Description | Deaths (Affected) | Deaths (At Risk) | Serious Events (Affected) | Serious Events (At Risk) | Other Events (Affected) | Other Events (At Risk) |
|---|---|---|---|---|---|---|---|---|
| EG000 | AnaConDa | Anesthetic Conserving Device (AnaConDa or ACD) has a charcoal filter. |
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| Title | Organization | Phone | Extension | |
|---|---|---|---|---|
| Dr Louise Walther Sturesson | Region Skane, Lund University Hospital, Lund, Sweden | +46 46 171953 | louise.waltersturesson@skane.se |
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| years |
|
| Age, Categorical | Count of Participants | Participants |
|
| Sex: Female, Male | Count of Participants | Participants |
|
| Region of Enrollment | Number | participants |
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| 0 |
| 6 |
| 0 |
| 6 |
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