airway management devices
DESCRIPTION
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AIRWAY MANAGEMENT establishing, maintaining & removing artificial airway with complications.
Dr. Poonam Patel
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AIRWAY MANAGEMENT
Assessment Mallampati score, mouth opening, thyromental distance Securing & maintenance airway devicesArtificial airway
Supraglottic airway devices
Tracheal tube
Devices for difficult airway
Management of complications -
AIRWAY ASSESSMENT
Cervical spine movementT-M joint movementMouth openingModified Mallampati gradingThyromental distance -
ARTIFICIAL AIRWAY
Purpose of an airway lift the tongue and epiglottis away from the posterior pharyngeal wall.
Advantage of an airway
Cervical spine movement does not occur when airway is inserted.Decreased work of breathing during spontaneous respiration using a face mask.TypesOropharyngeal airway
Nasopharyngeal airway
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AIRWAY ANATOMY
NormalObstructed airway -
OROPHARYNGEAL AIRWAY
Guedel airway
Parts flange, bite portion, air channel -
OROPHARYNGEAL AIRWAY (contd.)
Sizes availableColour codingSizesLength (mm)00030004005016027038049051006110 -
OROPHARYNGEAL AIRWAYS (contd.)
UsesTo maintain open airway
Prevent endotracheal tube occlusion
Prevent tongue bite
Facilitate suction
Conduit for passing devices into oropharynx
Obtain a better mask fit
ContraindicationsIntact gag reflex
Oropharyngeal growth
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OROPHARYNGEAL AIRWAY (contd.)
Pre requisite for insertionSize estimationMethods of insertionDisadvantages - Due to incorrect sizeLaryngospasm in awake patientAdvantages -1) Simple to use, cheap.
2) Not associated with sore throat
3) Does not cause bacteremia
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NASOPHARYNGEAL AIRWAY
Parts flange, airway channel, bevel.Size - inside diameter in millimeters.Size determination Method of insertion Contraindications1) Anticoagulation
2) Basilar skull fracture
3) Nasal pathology, sepsis, or deformity of the nose or nasopharynx
4) History of epistaxis requiring medical treatment.
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NASOPHARYNGEAL AIRWAY (contd.)
Uses of nasopharyngeal airwayTo maintain airway in patients with intact gag reflex
To facilitate suctioning
As a guide for a fiberscope or nasogastric tube
To apply continuous positive airway pressure (CPAP)
To dilate the nasal passages in preparation for nasotracheal intubation
To maintain the airway and administer anesthesia during dental surgery.
To maintain ventilation during oral fiberoptic endoscopy.
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NASOPHARYNGEAL AIRWAY (contd.)
Advantages-1) Nasal airway is better tolerated than an oral airway if the patient has intact airway reflexes.
2) Loose or poor dentition.
3) Trauma or pathology of the oral cavity.
4) It can be used when the mouth cannot be opened.
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COMPLICATIONS OF ARTIFICIAL AIRWAY
Airway Obstruction
Trauma
Tissue Edema
Ulceration and Necrosis
Central Nervous System Trauma
Dental Damage
Laryngospasm and Coughing
Retention, Aspiration, or Swallowing
Devices Caught in Airway
Equipment Failure
Latex Allergy
Gastric Distention
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SUPRAGLOTTIC AIRWAY DEVICES
Supraglottic devices fill a niche between the face mask and tracheal tube in terms of both anatomical position and degree of invasiveness. These devices sit outside the trachea but provide a handsfree means of achieving a gas-tight airway. -
SUPRAGLOTTIC AIRWAY DEVICES
Laryngeal Mask Airway Family
LMA ClassicLMA UniqueLMA FlexibleLMA FastrachLMA CTrachLMA Proseal2) Other supraglottic airways similar to laryngeal mask
Soft seal laryngeal maskAmbu laryngeal maskIntubating laryngeal airway3) Other supraglottic airway devices
Laryngeal tube airwayPerilaryngeal airwayStreamlined pharynx airway liner -
LARYNGEAL MASK AIRWAY FAMILY
LMA-Classic (standard LMA, Classic LMA, LMA-C, cLMA) PARTSCurved tube (shaft)
Elliptical spoon-shaped mask
Two flexible vertical bars.
An inflatable cuff.
An inflation tube
Self-sealing pilot balloon.
15-mm connector .
- cLMA size Patient size1Neonates/infants up to 5 kg 1.5Infants between 5 and 10 kg 2 Infants/children between 10 and 20 kg 2.5Children between 20 and 30 kg3Children 30 to 50 kg4Adults 50 to 70 kg 5Adults 70 to 100 kg 6Adults over 100 kg.
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LMA CLASSIC
Insertion methodsStandard Technique
180-degree Technique
Partial Inflation Technique
Thumb Insertion Technique
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LMA-UNIQUE
Disposable laryngeal mask airway, DLMA). It is made of polyvinylchloride The dimensions are identical to the standard LMA, the tube is stiffer and the cuff less compliant. Sizes It may be a better choice for out-of-hospital or ward use.Insertion and placement of the LMA-Unique is similar to the LMA-Classic. The intracuff pressure increases significantly less in the LMA-Unique when nitrous oxide is used. -
LMA-FLEXIBLE
The LMA-Flexible (wire-reinforced, reinforced LMA, RLMA, FLMA, flexible LMA) has a flexible, wire-reinforced tube. The tube is longer and narrower. Not available in sizes 1 and 1.5Useful for head and neck surgeriesInsertion method Disadvantages -1) The wire reinforcement does not prevent obstruction from biting.
2) The spiral reinforcing wire may become disrupted.
3) Only small sizes of tracheal tube or bronchoscope can pass through it.
4) Not preferred prolonged spontaneous ventilation.
5) Unsuitable for MRI scanning
6) Malposition is less easily diagnosed.
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LMA-FASTRACH
The LMA-Fastrach (intubating LMA, ILMA, ILM, intubating laryngeal mask airway) designed for tracheal intubation.Parts1) A short, curved stainless steel shaft with a standard 15-mm connector.
2) Single, movable epiglottic elevator bar
3) A V-shaped guiding ramp built into the floor of the mask.
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LMA-FASTRACH
Insertion technique UsesTo facilitate tracheal intubation
It can also be used as a primary airway device.
Tracheal Intubation using LMA FastrachBlind,
Blind nasal
Fiberscopic guided
Light guided
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LMA-FASTRACH
DisadvantagesPharyngeal pathology or limited mouth opening may make intubation difficult.
Cannot be used for intubation in patients below 30 kg.
The LMA-Fastrach tracheal tube is expensive & prolonged use is to be avoided.
The tracheal tube may be displaced downward or dislodged.
It should not be used in the prone position
Unsuitable for use in the MRI unit.
Increased incidence of sore throat and difficulty swallowing .
In patients with immobilized cervical spine, exerts pressure on the cervical spine.
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LMA-CTrach
It has two built-in fiberoptic channels with a monitor.Sizes - 3, 4, and 5Insertion techniqueAdvantagesHigh first intubation attempt success rate with minimal neck movement.
2) Can be used during awake intubation in the presence of an unstable cervical spine.
Disadvantages1) Poor image quality
2) The view may be obstructed by secretions, lubricant, or blood.
3) Cannot be used easily in the patient with a limited mouth opening.
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Parts - cuff, inflation line with pilot balloon, airway tube, and drain (gastric access) tube.Function of second dorsal cuffInsertion techniques introducer, guided, digital methodsConfirmation of proper placement
LMA-ProSeal -
LMA-ProSeal
LMA Size Weight (kg) Max Cuff Inflation Volume (mL) Max. Fiberoptic Scope Size (mm) Max. gastric Tube Size (Fr)Length of Drain Tube (cm)Largest Tracheal Tube (ID in mm) 1.55 to 10 7-1018.2 4.0 uncuffed 210 to 20 10-1019.0 4.0 uncuffed2.520 to 30 14-1423.0 4.5 uncuffed330 to 50 20-1626.5 5.0 uncuffed450 to 70 3041627.5 5.0 uncuffed570 to 100 4051828.5 6.0 cuffed -
LMA-ProSeal
UsesCan be used for both spontaneous and controlled ventilation.
Preferred in situations where higher airway pressures are required, better airway protection is desirable, and for surgical procedures in which intraoperative gastric drainage or decompression is needed
Useful in cases where it is important to avoid airway trauma.
Safe for use in an MRI unit
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LMA-ProSeal
Disadvantages -
1) The LMA-ProSeal is less suitable as an intubation device.
2) Higher resistance in spontaneously breathing patients than other devices.
3) Requires a greater depth of anesthesia for insertion.
4) Airway obstruction after insertion.
5) Gastric insufflation
6) The LMA-ProSeal has a shorter life span.
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LARYNGEAL TUBE AIRWAY
PartsThe airway tube is wide, curved, color coded on the connector.
single lumen that is closed at the tip.
Small (esophageal, distal) cuff near the blind distal tip
Large (oropharyngeal, pharyngeal) cuff near the middle of the tube
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LARYNGEAL TUBE AIRWAY (Cont.)
5) One inflation tube to inflate both light blue cuffs.
6) Two anterior-facing, oval-shaped openings (ventilation holes)
7) Side holes lateral to the top of the distal opening.
8) A ramp leads from the posterior wall toward the main ventilatory outlet
Reusable silicone or single-use versions made of polyvinylchloride. -
LARYNGEAL TUBE AIRWAY (Cont.)
Size Patientweight (kg)Color of ConnectorMaximum Cuff Volume (mL)0neonate< 6Transparent151infant6 - 15white402child15 - 30green603Small adult30 - 60yellow1204Medium adult50 90red1305Large adult> 90violet150 -
LARYNGEAL TUBE AIRWAY (Cont.)
Insertion technique Advantages -1) The LT is relatively easy to insert
2) It is well tolerated during emergence
3) Because the distal cuff fits over the esophageal inlet, the risk of gastric inflation is low
4) Can be used with both spontaneous and controlled ventilation
5) High ventilation pressures can be used.
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Laryngeal Tube Airway (Cont.)
6) This device may be especially useful for resuscitation (cannot intubate, cannot ventilate situation , obstetrics after failed intubation, edentulous patients).
7) The incidence of complications such as sore throat, mouth pain, or dysphagia is low.
8) Regurgitated liquid is less likely to be aspirated with the LT
DisadvantageFailure to ventilate if tube enters trachea contrast combitube
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ENDOTRACHEAL TUBE
The tracheal tube (endotracheal tube, intratracheal tube, tracheal catheter) is a device that is inserted through the larynx into the trachea to convey gases and vapors to and from the lungs.PartsThe machine (proximal) end
The patient (tracheal or distal) end
Bevel.
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ENDOTRACHEAL TUBE
4) Murphy eye
5) A radiopaque marker
6) Cuff Systems - consists of the cuff plus an inflation system, which includes an inflation tube, a pilot balloon, and an inflation valve.
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ENDOTRACHEAL TUBE
Latex coated red rubber tubesPVC tubesReused multiple times DisposableNot transparentTransparentHarden and become sticky with age, poor resistance to kinking, become clogged by dried secretionsLess likely to kink than rubber tubes. They are stiff enough for intubation at room temperature but soften at body temperature, so they tend to conform to the patient's upper airway. Latex allergy in susceptible patientsNo latex allergy -
ENDOTRACHEAL TUBE
Oral intubation
Direct Laryngoscopy
Blind Oral Intubation
Digital Technique
Fiberoptic guided
Retrograde intubation
Nasal intubation
Direct Laryngoscopy
Flexible Fiberoptic Laryngoscopy
Blind Nasal Intubation
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EXTUBATION
The tracheal tube (extubation) is removed when it is no longer needed for airway protection. Extubation may be performed at different depths of anesthesia - awake, light, and deep Preparation for ExtubationInitial Plan
Patient position plan
Bite block in place
Throat pack removed
Preoxygenation
Secretions aspirated from the pharynx (the trachea also if indicated)
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EXTUBATION
Complications at ExtubationHypoventilation (residual effect of anesthetic drugs and neuromuscular blockade)
Upper airway obstruction
Laryngospasm and bronchospasm
Coughing (wound disruption)
Impaired laryngeal competence and pulmonary aspiration
Hypertension, tachycardia, dysrhythmias, myocardial ischemia
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FLEXIBLE FIBEROPTIC BRONCHOSCOPY
IndicationsDifficult intubation predicted
Congenital airway abnormalities
Acquired airway abnormalities
Trauma
Contraindications-
Lack of time
Blood & secretions in oral cavity
Edema of pharynx or tongue
Technique oral or nasal (awake or GA) -
COMBITUBE
Device for difficult airwayPARTS1) Two separate lumens (pharyngeal & tracheoesophageal) that are fused longitudinally
2) Two inflatable cuffs.
3) Each lumen is linked by a short tube to a standard 15-mm connector at the breathing system end.
4) Pharyngeal lumen - occluded distal end and eight oval-shaped perforations (ventilating eyes) between the cuffs, coloured blue.
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COMBITUBE
5) Tracheoesophageal lumen - patent distal end and a clear tube.
6) The smaller distal cuff serves to seal either the esophagus or trachea, depending on its placement.
7) The larger (pharyngeal) cuff (balloon) is above the perforations.
8) The pilot balloon for the pharyngeal cuff is colored blue.
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COMBITUBE
Sizes:Regular (41 [Fr])
SA (37 Fr)
Recommended for patients with a height greater than 5 feet (152 cm). Not recommended for patients younger than 12 years of age.METHOD OF INSERTION -
COMBITUBE
IndicationsAirway management in the difficult-to-intubate patient
Massive airway bleeding or regurgitation.
Limited access to the airway and limited mouth opening
Cervical spine injury.
Useful in entertainers in whom it is important to avoid vocal cord damage.
In cardiopulmonary resuscitation in both prehospital and in-hospital settings.
Cannot ventilate, cannot intubate situation.
Can be used during percutaneous dilatational tracheostomy or tracheotomy
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COMBITUBE
ContraindicationsActive pharyngeal or laryngeal reflexesOesophageal trauma or pathologyingestion of corrosive agentsOropharyngeal, pharyngeal, or hypopharyngeal mass. -
COMBITUBE
AdvantagesTime needed for insertion is short and less skill is required
Can be inserted in presence of blood or secretions in the oropharynx.
Provides comparable ventilation and improved oxygenation to that of tracheal intubation
It can be used by an anesthesia provider having limited use of the left arm .
It is well tolerated by the patient during emergence from anesthesia.
Its use is not associated with high levels of trace gases.
Decreased risk of accidental extubation.
The Combitube provides good but not complete protection from aspiration
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COMBITUBE
DisadvantagesTracheal suctioning or fiberoptic bronchoscopy is not possible through the Combitube in the esophageal position
High airflow resistance
Insertion and removal of the Combitube is associated with a higher stress response
Trauma to the airway and esophagus
Sore throat and dysphagia.
Unsuitable for use in a patient with latex allergy .
The Combitube is expensive compared to other single use devices.
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RETROGRADE INTUBATION
Retrograde (translaryngeal-guided, guided blind) intubation is an elective or emergency technique for securing a difficult airway, either alone or in conjunction with other techniques. Retrograde intubation is a useful option in patients who cannot be intubated by using traditional techniques. Procedure can be expected to take 5 minutes or more for completion. -
Retrograde intubation set
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RETROGRADE INTUBATION
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RETROGRADE INTUBATION
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RETROGRADE INTUBATION
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RETROGRADE INTUBATION
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Indications
RETROGRADE INTUBATIONDifficult intubations
Airway trauma
Oro - Pharyngeal bleed
Cervical spine injury
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RETROGRADE INTUBATION
ComplicationsSore throat
Trauma
Barotrauma
Pretracheal abscess
The tracheal tube may inadvertently slip out as it is advanced
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CRICOTHYROTOMY
Placing a device through the cricothyroid membrane to gain control of the airway. It is part of the ASA and Difficult Airway Society difficult airway algorithms. Anatomical considerations TechniquesNeedle Cricothyrotomy
Percutaneous Dilatational Cricothyrotomy
Surgical Cricothyrotomy
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NEEDLE CRICOTHYROTOMY
Ventilation Techniques - Jet VentilationDevicesA number of jet ventilation devices are commercially available.
Automatic Ventilator
Manual Jet Ventilation Device
Flowmeter
Oxygen Flush
Anesthesia Breathing System
Manual Resuscitation Bag
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Percutaneous Dilatational Cricothyrotomy
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IndicationsUpper Airway Obstruction with Inability to Ventilate or Intubate
Anticipated Difficult Intubation - Cricothyrotomy may be used as an adjunct to fiberoptic or other intubation techniques where it is anticipated that intubation may be difficult to perform.
Procedures Involving the Airway
Cervical Spine Injury
CRICOTHYROTOMY
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CRICOTHYROTOMY
ContraindicationsIntrathoracic Airway Obstruction
Inability to Locate the Cricothyroid Membrane
Complete Airway Obstruction
Paediatric patients
Laryngeal pathology
Decreased compliance
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CRICOTHYROTOMY
AdvantagesSimple, quick, easy to perform
Prevents tracheal collapse
Disadvantage-Does not provide definitive airway
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CRICOTHYROTOMY
ComplicationsBarotrauma
Trauma
Subcutaneous / mediastinal emphysema
Tracheal stoma granulation
Persistent stoma
Tracheal stenosis
Dysphonia
Vocal cord paresis
Wound infection
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American Society of Anesthesiologists Difficult Airway Algorithm.
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REFERENCES
Understanding anesthesia equipments Dorsch, 5th editionMillers text book of anesthesia 7th editionClinical anesthesia MorganCME Airway- MAMCAirway management Rashid Khan