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Mask or nasal cannula, the choice is yours
Sentri™ is available as an adult mask and in three sizes of nasal cannula. Both permit the sampling of exhaled carbon dioxide in non-intubated patients during the administration of supplementary oxygen.

The Sentri™ Mask is an adult, medium concentration Intersurgical EcoLite™ oxygen mask with a luer lock connector enabling the connection of a monitoring line, the other end of which is connected to a capnometer. The Sentri™ mask is used for measuring end-tidal CO2 (ETCO2) in expired gases while supplying oxygen to the patient. 

Capnography is vital during sedation
The increased use of conscious sedation has created a need for a device to monitor respiratory depression. The difference between conscious sedation and general anaesthesia is sometimes very small. It is possible during conscious sedation that intravenous sedatives and narcotics administered to allay apprehension can result in the loss of consciousness and respiratory obstruction.


An updated statement from the Association of Anaesthetists of Great Britain & Ireland (AAGBI) in May 2011 states:  "Continuous capnography is recommended for all patients undergoing deep sedation or any sedation where the airway cannot be directly observed"

The American Society of Anesthesiologists (ASA) recently updated monitoring standards for ventilation: 
"During moderate or deep sedation the adequacy of ventilation shall be evaluated by continual observation or qualitative clinical signs and monitoring for the presence of exhaled carbon dioxide"

Recommendations for standards of monitoring during anaesthesia and recovery 2015. Anaesthesia 2016; 71: 85-93 states:
"Capnography monitoring is essential at all times in patients with endotracheal tubes, supraglottic airway devices and those who are deeply sedated."

In the article 'Capnography for the Nonintubated Patient in the Emergency Setting by Craig A Manifold, DO: Neil Davids, MD: Lance C. Villers, PHD: David A. Wampler, PHD. J Emerg Med. 2013:45(4):626-632 it states: 
"ETCO2 is safe, noninvasive, inexpensive and rapidly performed at the bedside. It is an essential tool for evaluating patients in the emergency setting"

Microstream® is a registered trademark of Oridion Medical 1987 Ltd.
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Sano H, Komasawa N, Konishi Y, Minami T
The American Journal of Emergency Medicine
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