BEH Airway Flashcards
Define airway management
The provision of a free and clear passage for airflow. An obstruction may be PARTIAL or COMPLETE and may occur at any level from the nose to the trachea.
Name the 3 sections of the pharynx and describe their position.
Nasopharynx: located behind the nasal cavity and above the soft palate.
Oropharynx: between the soft palate and the epiglottis
Laryngopharynx (Hypopharynx): from the upper border of the epiglottis to the lower border of the cricoid cartilage
What are the upper airway differences between adults and paeds?
The paediatric airway is generally smaller, therefore there is a greater risk of obstruction.
The airway is also funnel shaped (compared to a cylinder in adults).
Trachea is softer and can more easily collapse (kink)
What is the purpose of a gag reflex?
- A gag reflex helps prevent the lower airway from aspiration,
- entry of solids or fluids into the trachea, bronchi and lungs by expelling objects from the upper airway.
- An intact gag, therefore, is essential to protecting the airway from obstructions and aspiration.
What happens when a patient’s conscious level decreases?
A decrease in conscious level causes the muscles of the tongue to become lax causing the tongue to fall posteriorly and obstruct the oropharynx, or the epiglottis tofall posterio-inferiorly and obstruct the glottic opening.
The gag reflex deteriorates blow GCS 9, where the patient can choke on foreign objects. An absent gag reflex can also cause vomiting into the upper airway and aspiration into the lungs.
What are the 3 components of the TRIPLE AIRWAY MANOEUVER
Head tilt
Chin lift
Jaw thrust
Why is hyperextending the neck in the triple airway manoeuver not advised?
It can flatten or kink the airways making future ventilation difficult.
It is also potentially damaging for suspected neck injuries.
What is the appropriate head positioning for adults, children and infants?
Adults: The preferred head placement option for adults has the occiput elevated on a folded towel to a height of 2-5 cm from surface. This is preferred even in spinal injury and is considered natural neutral anatomical position.
Children (1 - 14): The child aged 1 to 14 is likely best managed supine with the head in the same surface plane as the body. Therefore, padding may not be required.
Infant: Infants are best managed with a small towel (2cm) underneath their shoulders. This is opposite to adult patient management.
INfants are primarily nose breathers
What is the purpose of placing a patient in the lateral position?
After the pt’s airway has been assessed and patency has been assured, the pt can be moved into a stable side position to protect airway. Pt’s with a potential spinal cord injury must at all times be managed supine, unless deemed necessary to clear airway (i.e. blood, vomitus, submersion). Gravity assists in clearing the airway.
By placing pt in a stable side position, there is less potential for the tongue to obstruct oropharynx, and thereby impede oxygen delivery to lungs.
What is the purpose of an Oropharyngeal airway (OPA)?
Their use is to simply block the tongue from falling backwards and occluding the oropharynx.
aka “glorified tongue depressor”
What are the advantages and disadvantages of an OPA?
- *Advantages**
- Prevents tongue from falling backwards and occluding the oropharynx.
- Hard plastic helps to prevent teeth clenching.
- Larger diameter to allow for better oxygenation.
- *Disadvantages**
- OPA must be measured correctly to avoid either not working effectively if too small (don’t work as they are intended to) or damaging the soft posterior structures if too big.
What are the indications for and OPA?
The OPA is only indicated in unconscious pts; otherwise it is likely to initiate gagging and vomiting.
As a bite block to support an endotracheal tube (to prevent pt biting of the ETT and occluding this soft tube)
What are the contraindications for an OPA?
Pt’s with an intact gag reflex (even a weak one – it should be removed). Gag responses increase ICP which impact on CPP
** Remember: CPP = MAP – ICP **
Pt’s that have trismus (clenched jaws).
How do you select the correct size for an OPA?
Select the correct sized OPA by measuring the distance from the pt’s lips to the angle of their jaw.
How is an OPA inserted?
- Suction oropharynx if required.
- Open the pt’s mouth and remove dentures if loosley fitted. If firmly adhered to gums, leave in-situ.
- Hold the OPA with the curve facing upwards.
- Advance the OPA towards the hard palate and into the rear of the oropharynx.
- Rotate the OPA 180 degrees over the base of the tongue and into the oropharynx.
- Recheck the size and position of OPA.
- Verify patency of airway.
Paeds dont require to turn the OPA 180 degrees, because you may damage their soft palate.
What are the advantages of using a nasopharyngeal airway (NPA)?
- Better tolerated than the OPA in the semi-conscious pt and is less likely to induce vomiting in pts with an intact gag reflex.
- Able to be used in pts with trismus (clenched jaws) or dental trauma.
- Rapidly inserted.
- No pre-set age, but length of NPA protruding from nostril should not be excessive as to be kinked by the application of the rigid facemask.
What are the disadvantages of using a nasopharyngeal airway (NPA)?
- May cause epistaxis (nosebleed).
- Smaller internal diameter than OPA.
- May be difficult to suction through.
- Does not isolate trachea.
- May obstruct post insertion.
- Difficult to insert in the presence of nasal trauma, or established nasal deformity.
What are the indications of using a NPA?
The patient in an altered conscious state in the presence of trismus.
What are the contraindications of using a NPA?
Middle third facial fracture
Possibility of introducing the NPA into the brain!
Also risk of infection – keep NPA as clean as possible.
Significant nasal trauma.
– Difficult insertion and Likelihood of making the injury worse.
- *Traumatic brain injury and neurological event where airway is patent and tidal volume is adequate despite trismus.**
- Likelihood of eliciting a gag response and subsequently increasing ICP.
What are some of the precautions for NPA?
- Base of skull fractures and Facial Fractures.
- Cerebrospinal fluid (CSF) from nares or ears.
- Strong possibility of compromised skull integrity therefore there is a risk of inserting NPA into brain. Proper insertion technique however will reduce chances.
- May require removal if view in intubation attempts are affected.
How is the NPA measured?
- The NPA is measured from the tip of the nose to the ear lobe.
- Therefore it does not automatically go ALL the way up the nostril up to the flange.
- However, choose an appropriate sized NPA which when measured will not result in the flange being too distant from the nare as this may cause complications with ventilation later on.
Why are OPA contraindicated in OPAs?
Stimulation of the gag reflex can cause gagging and vomiting. Both actions increase intra-cranial pressure (ICP), and, in the unconscious pt vomiting severely threatens the patency of the airway.
An increase in ICP can have detrimental effects in pts with a traumatic brain injury or neurological event (i.e. stroke) as it can increase damage to the brain as a result of the increased pressure.
How do you correctly apply the BVM?
How long should suction be applied?
- Recommended that each suction procedure should last no longer than 5 secs and the suction should be applied continuously rather than intermittently.
- Recommended to pre-oxygenate pt for at least 30 sec prior and after suctioning.
