LETTER TO EDITOR
Year : 2014 | Volume
| Issue : 3 | Page : 445-446
Yet another way to clear water drops from ETCO 2 sampling line
Akshaya N Shetti
Department of Anesthesiology and Critical Care, Mahatma Gandhi Medical College and Research Institute, Pondicherry, India
Dr. Akshaya N Shetti
Department of Anesthesiology and Critical Care, Mahatma Gandhi Medical College and Research Institute, Pondicherry
Source of Support: None, Conflict of Interest: None
|Date of Web Publication||11-Jul-2014|
|How to cite this article:|
Shetti AN. Yet another way to clear water drops from ETCO 2 sampling line. Saudi J Anaesth 2014;8:445-6
It is very common to see the alarm in monitor, "sample line obstruction" especially in prolonged surgeries. It is always wise to check for a kinking of sampling line first and solve other common problem like obstruction due to water droplets. There are different ways to overcome such problem viz, using auxillary oxygen  or compressed air to clean sampling line, prophylactically putting HME filters. 
The most common thing anesthesiologist does is changing the sampling line. Many a times additional sampling line is not available. In such situation cleaning the sampling line is done by using auxiliary oxygen supply with added disadvantage of diluting anesthetic gases. Even though this method is effective, many anesthesia workstations are not having facility of auxiliary oxygen supply. In such condition, this method will help to clear water droplets.
In this method, the angle connector with side port is attached to common gas outlet as shown in [Figure 1]. The proximal end of sampling line is connected to side port simultaneously obstructing the open end of angle connector. The switch is turned from circle system to the open system. The fresh gas flow is increased to a total of 6-7 L/min to clear water droplets. Once cleared, the proximal end of sampling line is attached to ETCO 2 module; by switching the knob to circle system the fresh gas flow is reduced to initial setting. This method helps during head and neck surgeries also where the distal end of sampling line is not approachable. One should not forget to switch back to the circle system at the end of cleaning sampling line.
|Figure 1: Attachment of angle connector and sampling line to common gas outlet|
Click here to view
Sampling line can be cleaned using this method effectively at the end of the case by oxygen flush instead of fresh gas flow.
| References|| |
|1.||Chhabra S, Taxak S. An easy solution to obstructed sampling line: Auxillary oxygen flowmeter. Saudi J Anaesth 2012;6:312-3. |
|2.||Srinivasan NM. Use of heat and moisture exchanger in intubated patients reduces the blockage in gas sampling tube of the mass spectrometer. Saudi J Anaesth 2011;5:112-3. |