Endotracheal intubation is the placement of a tube into the trachea (windpipe) in order to maintain an open airway in patients who are unconscious or unable to breathe on their own. Oxygen, anesthetics, or other gaseous medications can be delivered through the tube.
Specifically, endotracheal intubation is used for the following conditions:
- respiratory arrest
- respiratory failure
- airway obstruction
- need for prolonged ventilatory support
- Class III or IV hemorrhage with poor perfusion
- severe flail chest or pulmonary contusion
- multiple trauma, head injury and abnormal mental status
- inhalation injury with erythema/edema of the vocal cords
- protection from aspiration
To begin the procedure, an anesthesiologist opens the patient's mouth by separating the lips and pulling on the upper jaw with the index finger. Holding a laryngoscope in the left hand, he or she inserts it into the mouth of the patient with the blade directed to the right tonsil. Once the right tonsil is reached, the laryngoscope is swept to the midline, keeping the tongue on the left to bring the epiglottis into view. The laryngoscope blade is then advanced until it reaches the angle between the base of the tongue and the epiglottis. Next, the laryngoscope is lifted upwards towards the chest and away from the nose to bring the vocal cords into view. Often an assistant has to press on the trachea to provide a direct view of the larynx. The anesthesiologist then takes the endotracheal tube, made of flexible plastic, in the right hand and starts inserting it through the mouth opening. The tube is inserted through the cords to the point that the cuff rests just below the cords. Finally, the cuff is inflated to provide a minimal leak when the bag is squeezed. Using a stethoscope, the anesthesiologist listens for breathing sounds to ensure correct placement of the tube.
For endotracheal intubation, the patient is placed on the operating table lying on the back with a pillow under the head. The anesthesiologist wears gloves, a gown and goggles. General anesthesia is administered to the patient before starting intubation.
The anesthesiologist should evaluate and follow the patient for potential complications that may include edema; bleeding; tracheal and esophageal perforation; pneumothorax (collapsed lung); and aspiration. The patient should be advised of the potential signs and symptoms associated with life-threatening complications of airway problems. These signs and symptoms include but are not limited to sore throat, pain or swelling of the face and neck, chest pain, subcutaneous emphysema, and difficulty swallowing.
The endotracheal tube inserted during the procedure maintains an open passage through the upper airway and allows air to pass freely to and from the lungs in order to ventilate them.
Alternatives to endotracheal intubation include:
- Esophageal tracheal combitube (ETC). The ETC is a double-lumen tube, combining the function of an esophageal obturator airway and a conventional endotracheal airway. The esophageal lumen has an open upper end, perforations at the pharyngeal level, and a closed distal end. The tracheal lumen has open ends. The lumens are separated by a wall and each is linked via a short tube with a connector. An oropharyngeal balloon serves to seal the oral and nasal cavities after
insertion. At the lower end, a second cuff serves to seal either the trachea or esophagus.
- Laryngeal mask airway (LMA). The LMA consists of an inflatable silicone ring attached diagonally to a flexible tube. The ring forms an oval cushion that fills the space around and behind the larynx. It achieves a low-pressure seal between the tube and the trachea without insertion into the larynx.
- Tracheostomy. A tracheostomy is a surgically created opening in the neck that allows direct access to the trachea. It is kept open with a tracheostomy tube. A tracheostomy is performed when it is not possible to intubate the patient.
See also Anesthesia evaluation.
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American Society of Anesthesiologists. 520 N. Northwest Highway, Park Ridge, IL 60068-2573. (847) 825-5586. <http://www.asahq.org/>.
"Endotracheal intubation." Health_encyclopedia. <http://www.austin360.com/search/healthfd/shared/health/adam/ency/article/003449.html>.
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Monique Laberge, Ph.D.