“Airway management”的意思、由来-开放百科全书

Airway management includes a set of maneuvers and medical procedures performed to prevent and relieve airway obstruction. This ensures an open pathway for gas exchange between a patient's lungs and the atmosphere.^[1] This is accomplished by either clearing a previously obstructed airway; or by preventing airway obstruction in cases such as anaphylaxis, the obtunded patient, or medical sedation. Airway obstruction can be caused by the tongue, foreign objects, the tissues of the airway itself, and bodily fluids such as blood and gastric contents (aspiration).

Basic techniques are generally non-invasive and do not require specialized medical equipment or advanced training. These include head and neck maneuvers to optimize ventilation, abdominal thrusts, and back blows.

Advanced techniques require specialized medical training and equipment, and are further categorized anatomically into supraglottic devices (such as oropharyngeal and nasopharyngeal airways), infraglottic techniques (such as tracheal intubation), and surgical methods (such as cricothyrotomy, and tracheotomy).^[2]

Airway management is a primary consideration in the fields of cardiopulmonary resuscitation, anaesthesia, emergency medicine, intensive care medicine, and first aid. The "A" in the ABC treatment mnemonic is for airway.^[3]

Basic airway management

Basic airway management involves maneuvers that do not require specialized medical equipment (in contrast to advanced airway management). It is mainly used in first aid since it is non-invasive, quick, and relatively simple to perform. The simplest way to determine if the airway is obstructed is by assessing whether the patient is able to speak.^[4] Basic airway management can be divided into treatment and prevention of an obstruction in the airway.

Treatment

Treatment includes different maneuvers that aim to remove the foreign body that is obstructing the airway. This type of obstruction most often occurs when someone is eating or drinking. Most modern protocols, including those of the American Heart Association, American Red Cross and the European Resuscitation Council,^[4] recommend several stages, designed to apply increasingly more pressure. Most protocols recommend first encouraging the victim to cough, and allowing them an opportunity to spontaneously clear the foreign body if they are coughing forcefully. If the person's airway continues to be blocked, more forceful maneuvers such as hard back slaps and abdominal thrusts (Heimlich maneuver) can be performed. Some guidelines recommend alternating between abdominal thrusts and back slaps while others recommend starting with back slaps first.^[4] Having the person lean forward reduces the chances of the foreign body going back down the airway when coming up.^[5]

Performing abdominal thrusts on someone else involves standing behind them, and providing and inward and upward force in the upper abdomen. Abdominal thrusts can also be performed on oneself with the help of certain objects, such as by leaning over a chair. In adults, there is limited evidence that the head down position can be used for self-treatment of suffocation and appears to be an option only if other maneuvers do not work.^[6] In contrast, in children under 1 it is recommended that the child be placed in a head down position as this appears to help increase the effectiveness of back slaps and abdominal thrusts.^[7]

The American Medical Association and Australian Resuscitation Council advocate sweeping the fingers across the back of the throat to attempt to dislodge airway obstructions, once the choking victim becomes unconscious.^[8]^[9] However, many modern protocols and literature recommend against the use of the finger sweep.^[10] If the person is conscious, they should be able to remove the foreign object themselves, and if they are unconscious, a finger sweep can cause more harm. A finger sweep can push the foreign body further down the airway, making it harder to remove, or cause aspiration by inducing the person to vomit. Additionally, there is the potential for harm to the rescuer if they are unable to clearly see the oral cavity (for example, cutting a finger on jagged teeth).

Prevention

Prevention techniques focus on preventing airway obstruction by the tongue and reducing the likelihood of aspiration of stomach contents or blood. The head-tilt/chin-lift and jaw-thrust maneuvers are useful for the former while the recovery position is useful for the latter. If head-tilt/chin-lift and jaw-thrust maneuvers are performed with any objects in the airways it may dislodge them further down the airways and thereby cause more blockage and harder removal.{{citation needed|date=September 2016}}

The head-tilt/chin-lift is the primary maneuver used in any patient in whom cervical spine injury is not a concern. This maneuver involves flexion of the neck and extension of the head at Atlanto-occipital joint (also called the sniffing position), which opens up the airway by lifting the tongue away from the back of the throat. Placing a folded towel behind the head accomplishes the same result.^[4]

The jaw-thrust maneuver is an effective airway technique, particularly in the patient in whom cervical spine injury is a concern. It is easiest when the patient is positioned supine. The practitioner places their index and middle fingers behind the angle of the mandible to physically push the posterior aspects of the mandible upwards while their thumbs push down on the chin to open the mouth. When the mandible is displaced forward, it pulls the tongue forward and prevents it from occluding the entrance to the trachea.^[11]

The recovery position is an important prevention technique for an unconscious person that is breathing casually. This position entails having the person lie in a stable position on their side with the head in a dependent position so fluids do not drain down the airway, reducing the risk of aspiration.^[5]

Most airway maneuvers are associated with some movement of the cervical spine.^[12]^[13] When there is a possibility of cervical injury, collars are used to help hold the head in-line. Most of these airway maneuvers are associated with some movement of the cervical spine. Even though cervical collars can cause problems maintaining an airway and maintaining a blood pressure,^[14] it is not recommended to remove the collar without adequate personnel to manually hold the head in place.^[15]

Advanced airway management

In contrast to basic airway management maneuvers such as head-tilt or jaw-thrust, advanced airway management relies on the use of medical equipment. Advanced airway management can be performed "blindly" or with visualization of the glottis by using a laryngoscope. Advanced airway management is frequently performed in the critically injured, those with extensive pulmonary disease, or anesthetized patients to facilitate oxygenation and mechanical ventilation. Additionally, implementation of a cuffing system is used to prevent the possibility of asphyxiation or airway obstruction.^[16]

Many methods are used in Advanced airway management. Examples in increasing order of invasiveness include the use of supraglottic devices such as oropharyngeal or nasopharyngeal airways, infraglottic techniques such as tracheal intubation and finally surgical methods.^[21]^[17]

Removal of foreign objects

The ingestion and aspiration of foreign objects poses a common and dangerous problem in young children. It remains one of the leading cause of death in children under the age of 5.^[18] Common food items (baby carrots, peanuts, etc.) and household objects (coins, metals, etc.) may lodge in various levels of the airway tract and cause significant obstruction of the airway. Complete obstruction of the airway represents a medical emergency. During such crisis, caretakers may attempt back blows, abdominal thrust, or the Heimlich maneuver to dislodge the inhaled object and reestablish airflow into the lungs.^[19]

In the hospital setting, healthcare practitioners will make the diagnosis of foreign body aspiration from the medical history and physical exam findings. In some cases, providers will order chest radiographs, which may show signs of air-trapping in the affected lung. In advanced airway management, the inhaled foreign objects, however, are either removed by using a simple plastic suction device (such as a Yankauer suction tip) or under direct inspection of the airway with a laryngoscope or bronchoscope. If removal is not possible, other surgical methods should be considered.^[20]

Supraglottic techniques

Supraglottic techniques use devices that are designed to have the distal tip resting above the level of the glottis when in its final seated position. Supraglottic devices ensure patency of the upper respiratory tract without entry into the trachea by bridging the oral and pharyngeal spaces.^[16] There are many methods of subcategorizing this family of devices including route of insertion, absence or presence of a cuff, and anatomic location of the device's distal end. The most commonly used devices are laryngeal masks and supraglottic tubes, such as oropharyngeal (OPA) and nasopharyngeal airways (NPA).^[16] In general, features of an ideal supraglottic airway include the ability to bypass the upper airway, produce low airway resistance, allow both positive pressure as well as spontaneous ventilation, protect the respiratory tract from gastric and nasal secretions, be easily inserted by even a nonspecialist, produce high first-time insertion rate, remain in place once in seated position, minimize risk of aspiration, and produce minimal side effects.^[16]

A nasopharyngeal airway is a soft rubber or plastic tube that is passed through the nose and into the posterior pharynx. Nasopharyngeal airways are produced in various lengths and diameters to accommodate for gender and anatomical variations. Functionally, the device is gently inserted through a patient's nose after careful lubrication with a viscous lidocaine gel. Successful placement will facilitate spontaneous ventilation, masked ventilation, or machine assisted ventilation with a modified nasopharyngeal airway designed with special attachments at the proximal end. Patients generally tolerate NPAs very well. NPAs are preferred over OPAs when the patient's jaw is clenched or if the patient is semiconscious and cannot tolerate an OPA.^[21] NPAs, however, are generally not recommended if there is suspicion of a fracture to the base of the skull. In these circumstances, insertion of the NPA can cause neurological damage by entering the cranium during placement.^[21] There is no consensus, however, regarding the risk of neurological damage secondary to a basilar skull fracture compared to hypoxia due to insufficient airway management.^[22]^[23] Other complications of Nasopharyngeal airways use includes laryngospasm, epistaxis, vomiting, and tissue necrosis with prolonged use.^[16]

Infraglottic techniques

In contrast to supraglottic devices, infraglottic devices create a conduit between the mouth, passing through the glottis, and into the trachea. There are many infraglottic methods available and the chosen technique is reliant on the accessibility of medical equipment, competence of the clinician and the patient's injury or disease. Tracheal intubation, often simply referred to as intubation, is the placement of a flexible plastic or rubber tube into the trachea to maintain an open airway or to serve as a conduit through which to administer certain drugs.^[29] The most widely used route is orotracheal, in which an endotracheal tube is passed through the mouth and vocal apparatus into the trachea. In a nasotracheal procedure, an endotracheal tube is passed through the nose and vocal apparatus into the trachea. Alternatives to standard endotracheal tubes include laryngeal tube and combitube.

Surgical methods

Surgical methods for airway management rely on making a surgical incision below the glottis in order to achieve direct access to the lower respiratory tract, bypassing the upper respiratory tract. Surgical airway management is often performed as a last resort in cases where orotracheal and nasotracheal intubation are impossible or contraindicated. Surgical airway management is also used when a person will need a mechanical ventilator for a longer period. Surgical methods for airway management include cricothyrotomy and tracheostomy.{{citation needed|date=September 2016}}

A cricothyrotomy is an emergency surgical procedure in which an incision is made through the cricothyroid membrane to establish a patent airway during certain life-threatening situations, such as airway obstruction by a foreign body, angioedema, or massive facial trauma.^[30] Cricothyrotomy is much easier and quicker to perform than tracheotomy, does not require manipulation of the cervical spine and is associated with fewer immediate complications.^[31] Some complications of cricothyrotomy include bleeding, infection, and injury to surrounding skin and soft tissue structures.

A tracheotomy is a surgical procedure in which a surgeon makes incision in the neck and a breathing tube is inserted directly into the trachea.^[32] A common reason for performing a tracheotomy includes requiring to be put on a mechanical ventilator for a longer period.^[32] The advantages of a tracheotomy include less risk of infection and damage to the trachea during the immediate post-surgical period.^[32] Although rare, some long term complications of tracheotomies include tracheal stenosis and tracheoinnominate fistulas.^[33]

Airway management in specific situations

Cardiopulmonary resuscitation

The optimal method of airway management during CPR is not well established at this time given that the majority of studies on the topic are observational in nature. These studies, however, guide recommendations until prospective, randomized controlled trials are conducted.

Current evidence suggests that for out-of-hospital cardiac arrest, basic airway interventions (head-tilt–chin-lift maneuvers, bag-valve-masking or mouth-to-mouth ventilations, nasopharyngeal and/or oropharyngeal airways) resulted in greater short-term and long-term survival, as well as improved neurological outcomes in comparison to advanced airway interventions (endotracheal intubation, laryngeal mask airway, all types of supraglottic airways (SGA), and trans-tracheal or trans-cricothyroid membrane airways).^[34]^[35] Given that these are observational studies, caution must be given to the possibility of confounding by indication. That is, patients requiring an advanced airway may have had a poorer prognosis in relation to those requiring basic interventions to begin with.

For the management of in-hospital cardiac arrest however, studies currently support the establishment of an advanced airway. It is well documented that quality chest compressions with minimal interruption result in improved survival.^[36] This is suggested to be due, in part, to decreased no-flow-time in which vital organs, including the heart are not adequately perfused. Establishment of an advanced airway (endotracheal tube, laryngeal mask airway) allows for asynchronous ventilation, reducing the no-flow ratio, as compared to the basic airway (bag-valve mask) for which compressions must be paused to adequately ventilate the patient.^[37]

Bystanders without medical training who see an individual suddenly collapse should call for help and begin chest compressions immediately. The American Heart Association currently supports "Hands-only"™ CPR, which advocates chest compressions without rescue breaths for teens or adults.^[38] This is to minimize the reluctance to start CPR due to concern for having to provide mouth-to-mouth resuscitation.

Trauma

Management of the airway in trauma can be particularly complicated, and is dependent on the mechanism, location, and severity of injury to the airway and its surrounding tissues. Injuries to the cervical spine, traumatic disruption of the airway itself, edema in the setting of caustic or thermal trauma, and the combative patient are examples of scenarios a provider may need to take into account in assessing the urgency of securing an airway and the means of doing so.^[39]^[40]

The pre-hospital setting provides unique challenges to management of the airway including tight spaces, neck immobilization, poor lighting, and often the added complexity of attempting procedures during transport. When possible, basic airway management should be prioritized including head-tilt-chin-lift maneuvers, and bag-valve masking. If ineffective, a supraglottic airway can be utilized to aid in oxygenation and maintenance of a patent airway. An oropharyngeal airway is acceptable, however nasopharyngeal airways should be avoided in trauma, particularly if a basilar skull fracture is suspected.^[41] Endotracheal intubation carries with it many risks, particularly when paralytics are used, as maintenance of the airway becomes a challenge if intubation fails. It should therefore be attempted by experienced personnel, only when less invasive methods fail or when it is deemed necessary for safe transport of the patient, to reduce risk of failure and the associated increase in morbidity and mortality due to hypoxia.^[42]^[43]

Management of the airway in the emergency department is optimal given the presence of trained personnel from multiple specialties, as well as access to "difficult airway equipment" (videolaryngoscopy, eschmann tracheal tube introducer, fiberoptic bronchoscopy, surgical methods, etc.).^[44] Of primary concern is the condition and patency of the maxillofacial structures, larynx, trachea, and bronchi as these are all components of the respiratory tract and failure anywhere along this path may impede ventilation. Excessive facial hair, severe burns, and maxillofacial trauma may prevent acquisition of a good mask seal, rendering bag-valve mask ventilation difficult. Edema of the airway can make laryngoscopy difficult, and therefore in those with suspected thermal burns, intubation is recommended in attempts to quickly secure an airway prior to progression of the swelling.^[45] Furthermore, blood and vomitus in the airway may prove visualization of the vocal cords difficult rendering direct and video laryngoscopy, as well as fiberoptic bronchoscopy challenging.^[46] Establishment of a surgical airway is challenging in the setting of restricted neck extension (such as in a c-collar), laryngotracheal disruption, or distortion of the anatomy by a penetrating force or hematoma. Tracheotomy in the operating room by trained professionals is recommended over cricothyroidotomy in the case of complete laryngotracheal disruption or children under the age of 12.^[47]

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