Simple Airway Adjuncts
Two simple airway adjuncts are commonly available:
This device is designed to be inserted via the nostril into the back of the mouth, with the aim of creating a patent passage behind the tongue. Traditional teaching about sizing this device include choosing a size similar to that of the patient’s little finger, and similar in length to the distance from the tragus to the tip of the nose. These teachings have somewhat fallen out of favour and rather the device should rather be compared with the patient’s nostril to find an appropriate size.
The device should be inspected to ensure it is patent. It should have a large flange to prevent aspiration. If there is not a suitably large flange, then a safety pin should be inserted through the end of the airway. Care should be taken to ensure that a suction catheter could still be passed down the lumen of the device. Lubrication with a water base gel should be applied to the outside of the device. Traditionally it is taught that it is easier to insert the device through the right nostril. This is based on the fact that a majority of the population have a septum which deviates to the left.
Many rugby players will have previously sustained nasal trauma and therefore the nose should be inspected to determine which nostril is most likely to allow passage of this airway.
The nasopharyngeal airway should be lubricated with a water based gel. If not available use the player’s own saliva. Ensure the flange of the airway is large enough to prevent aspiration u the nostril. If it is not insert a safety pin to prevent this.
The nasopharyngeal airway is then inserted along the floor of the nose (i.e. at approximately 90 degrees to the face) – Note it should not be inserted “up” the nose. Mild resistance may be felt – This will be the nasal turbinates and is easily overcome by gently rotating the airway. Once inserted, the airway should be reassessed. Care should be taken when inserting this device as it can cause epistaxis, which can worsen the airway problem.
Insertion of a nasopharyngeal airway
Oropharyngeal airway (OPA)
The oropharyngeal airway is designed to be inserted via the mouth, with the rigid plastic passing beyond the tongue with the effect of lifting it forward, creating a patent airway.
There are several ways to size an oropharyngeal airway. These techniques are all acceptable and all achieve the same end point which is to choose a device which is long enough to successfully create a passage behind the tongue, without be so long that it causes laryngospasm.
Sizing of OPA: incisors to the angle of the mandible
Traditional teaching is that in the adult population the device is carefully inserted “upside down” and then rotated through 180 degrees. Newer teaching is that the device is inserted under direct vision the “right way up”, using a tongue depressor or laryngoscope blade to lift the tongue forward. The device should be inserted with great care since it is easy to inadvertently cause trauma to the soft and hard palates. Once inserted, the airway must be reassessed.
OPA insertion inverted technique
OPA insertion direct technique with tongue depression
Naso or Oropharyngeal airway?
To tolerate an orophayrngeal airway, the player must be deeply unconscious. If this is not the case, there is a significant risk of the patient vomiting, compounding any airway problems. A nasopharyngeal airway is much better tolerated but may not be as successful at opening the airway. A decision must be reached in each case about which device should be used.
If a patient does not tolerate a jaw thrust it is most unlikely they will tolerate an oropharyngeal airway. In this case a nasopharyngal would be more appropriate.