Quiz 1 Flashcards
(132 cards)
Pharynx
A tube connecting the nasal cavity, mouth, larynx, and esophagus
Approximately 13 cm in length (in adults)
Extends from the base of the skull to the cricoid cartilage (at level of C)
Muscular wall is composed of skeletal muscle-This means that there is voluntary control which allows us to hold our breath
Indication for Intubation
- Failure of airway maintenane or protection
- Failure of ventilation or oxygenation
- Anticipated clinical course
FAILURE OF AIRWAY MAINTENANCE AND PROTECTION
The patient who requires establishing of an airway also requires a way to protect their airway
Breathing on you own does not necessarily mean they can protect their airway
Gag Reflex
The gag reflex is a way to show that the pt. can protect their airway
However the gag reflex is ubiquitous and clinically a GCS assessment (less than 8 intubate) and the ability to both manage and swallow secretions can be more valuble
Causes of Respiratory Failure
- Hypercapneic Failure
- Hypoxemic Failure
Hypercapneic Failure
Second degree to impairment of ventilation
Type II Respiratory Failure
Generally due to: CNS dsyfunction, neuromuscular weakness, chest wall deformity, other pulmonary or metabolic conditions
Hypoxemic Failure
Type I Respiratory Failure
Most often caused through a V/Q mismatch
Diffusion surface area reduced (pulmonary edema, pneumonia, atelectasis)
Dead space ventilation (pulmonary embolism)
R -> L Shunt (airway obstruction, alveoar hypoventilation, cardiac shunt, and non pulmonary)
Goals of Intubation
Isolate Airway
Keep airway patent
Reduce risk of aspiration
Faciliate trachea suctioning
Delivery high fiO2 if needed
Provide route for administering certain drugs (NAVEL)
Ensure deliervy of an adequate tidal volume (6-8 ml/kg) to maintain adequate lung inflation and ventilation
Endotracheal Tubes-General
Inserted into the airway and sit at the distal end below the larynx and 2-5 cm above the carina (in adults)
Open at both ends
Proximal End of Endotracheal Tube
Standard 15 mm connector that can attach to the manual resuscitators or ventilators
Distal End of Endotracheal Tube
Beveled and rounded to help prevent trauma
Has the cuff attached to this end. The cuff is attached to the one-way inflating valve. The cuff seals the airway and needs to be inserted before insertion.
Endotracheal Tube-Parts
Murphy Eye-Where you can ventilate if the tube becomes blocked by secretions
E vap tube-Helps with suction
Radio-Opaque Line is used to see in x-ray to make sure that the placement is correct
Diameter is measure in mm and length is measured in cm
Laryngoscope
Used to visualize the larynx
There are many differnt kinds but they all have-handle (light source), blade (light source at distal 1/3)
There are two basic shapes-Straight (intended to pick up epiglottis) or curved (inserted to vallecula, depress hypoepiglottic ligament, and elevate epiglottis)
Average for adults is a size 3
Contradidications for Nasal Intubation
Apnea
Advantages of Oral Intubations
Faster than nasal intubation
Less likely to kink, bending of kinking of the tube will increase ETT resistance (to airflow, suction, and passage of any tube)
Disadvantages of Oral Intubation
More liekly to stimulate gag reflex
Can interfere with oral hygiene
Production of oral secretions may be stimulated (swallowing secretions difficult)
Patients may bite down on oral tube obstructing it creating more resistance to the point that they may lose the airway
Nasal Intubation Advantages
Route of choice when oral intubation is impossible
Easier insertion in pt. with impaired neck or jaw movement
pt. can not bite on nasal tube
Greater comfort-Awake intubations or long term intubations
What may make oral intubation unaccessible
Muscle Spasm, Seizures
Maxillofacial surgery or fractured mandible
Certain surgical procedures that require unobstructed oral access
Nasal Intubation Disadvantages
Soft tissue trauma and hemorrhage
Insertion may be limited by nares
Potential development for sinusitis or middle ear infection with lng term intubation
More difficult procedure for inexpienced practictioners
Oral Intubation Indications
Apnea (b/c it is quicker)
Nasal Fractures
Coagulopathy
Nasl obstruction
Deviated septum, polyps, coryza (nosebleeds), inflammed adenoids, foreign bodies, hematomas
Nasal Intubation Indications
Dyspenic patients who would worsen and can not tolerate the supine position
Oral cavity not accessible
inability to obtain sniffing position
When paralyzing agents are contradindicated (renal failure, burns)
Cartilage of Larynx
There is 9 Cartilages of the Larynx
2 Arytenoid Cartilages
2 Cuneiform Cartilages
2 Corniculate Cartilages
1 Thyroid Cartilage
1 Cricoid Cartilage
1 Epiglottis Cartilage
Trachea Measurements
Extends from the larynx to the main stem bronchi 12-15 cm in length
~2 cm in diameter
16-20 C-shaped cartilage rings
Carina Topography
Carina sits behind “angle of Louis” anteriorly and level of T4 posteriorly