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Airway management for all doctors
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Dr. Ashraf Ibrahim MBBCh, MD
Specialist in Anesthesia,Al Bukariya general hospital
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Expert airway management is an essential skill to be mastered by everyone
For successful management Anatomy of airway Evaluation of airway Proper equipments Adequate skills
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Nose PharynxLarynxTrachea
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Normal airway begins functionally at naresNose warms & humidifies inspired gasNasal breathing offers 1/3 of total airway
resistanceDuring exercise, mouth breathing employed
as resistance is lessResistance through nose is twice that of
mouth breathing
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Extends from posterior aspect of nose down to cricoid cartilage where it continues as oesophagus
Upper nasopharynx separated by uvula from lower oropharynx
Oropharynx obstruction occurs by relaxation of genioglossus & tongue falling back on posterior pharyngeal wall
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Lies at C 3 → C 6 vertebraServes as organ of phonation & valve to
protect lower airwaysLarynx has cartilages:
3 paired : Corniculate, Cuneiform, Arytenoids3 unpaired : Thyroid, Cricoid, Epiglottis
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Glottic opening is space between vocal cords< than 10 years children - narrowest
segment is cricoid ring> than 10 years glottic opening is narrowest
segment in airway
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Due to reduction of space between pharyngeal wall & base of tongue
This occurs due to relaxation of tongue (genioglossus) & jaw
Rx by preventing mandible from falling backBy placing forefinger & second finger behind
angle of mandiblePatient’s neck slightly extendedUse of oropharyngeal / nasopharyngeal
airways
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•11Patent airway Soft tissue obstruction
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The airway is inserted with the concave side facing the upper lip
When junction of bite portion & curved section is near the incisors, the airway is rotated 180* & slipped behind the tongue into final position
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Nasal airways Nasal airways
For children the size is the same as the endotracheal tubes
For adult males = 7.0 – 7.5 mmFor adult females = 6.5 – 7.0 mm
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Nasal airway should be lubricated wellNose should be examined for patencyNasal decongestant should be appliedAirway is inserted perpendicularly in line
with the nasal passages
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Initial interventions to assure a patent airway in spontaneously breathing patient without possible cervical head injury include “ Triple airway maneuver ”Slight neck extensionElevation of the mandibleMouth opening
If cervical spine injury is suspected, neck extension is only eliminated
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•Slight neck extension
•Elevation of the mandible
•Mouth opening
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Indications :If patient is apneicIf spontaneous tidal volumes are inadequateIf hypoxemia is associated with poor
spontaneous ventilation
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•25Little finger lifting the angle of mandible
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Supraglottic airway:LMACombitube
Glottic airway:Endotracheal intubation
Oral Nasal
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Emergency situations or Elective situationsBag & mask ventilationLMACombitubeEndotracheal intubationSurgical emergency airway
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Available 2.5 size to 9.0 size Size corresponds to the internal diameter in
millimeters Made of poly-vinyl chloride & transparent Has low pressure high volume cuff French unit is product of ID and 3 Bevel end if tube has Murphy’s eye to allow
passage of gas if bevel is occluded Sterilized by gamma radiation & disposable Radio – opaque line runs all along the tube Distance from tip is marked in centimeters
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Cuffed tube Uncuffed tubes
< than 6 years = ( Age / 3 ) + 3.5> than 6 years = ( Age / 4 ) + 4.5Tube size = (16 + age) divided by 4Adult female = 7 cuff tubeAdult male = 8 cuff tube For Nasal intubation # 1 size lesser than
correct oral tube is used
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12 + half the age in centimeters
The idea is to keep the tube in mid-trachea
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Laryngoscope with all size blades (0-4)StilletteSuction apparatus with catheter Bag & maskTape for securing tube
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Sizes available to suit the face0 to 5 sizesScented pediatric masks available tooTransparent mask:
Can observe vomitingCan observe cyanosisCan observe condensation of water vapor
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4 3 2 1
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Consists of detachable blade with bulb connecting to battery housed in handle
One handle will fit all the various blades very quickly
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Most popular scope all over the worldHas 4 blades , size 1,2,3,4Size 1 for small childrenSize 2 for bigger childrenSize 3 for all adultsSize 4 for difficult intubations
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Uses:To guide endotracheal tube in nasal
intubationTo guide Ryle’s tube into oesophagusTo pick up loose tooth from the pharynxTo swab the oral cavity of vomitus
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Rigid implement made of flexible metalInserted inside endotracheal tube to maintain
chosen shapeIt is bent over the tube to prevent protrusion
beyond the endotracheal tube & cause injuryFacilitates intubation when glottis
visualization is minimal / absent & a semi-blind or blind insertion is attempted
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Cloth adhesive tape used as it resists wetting by secretions
Securing by two tapes on the tube is safeBearded patients needs bandage cloth to
anchor the tube securely
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Described by Sellick in 1961 The cricoid cartilage is identified & pressed with
thumb & index finger by a trained assistant The larynx is pressed by the oesophagus on the
hard vertebral bodies The force needed is 30 to 40 Newtons or 8-9
pounds weight Prevents passive regurgitation from oesophagus Pressure released once the airway is secured & cuff
inflated
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Anesthesiologist must determine whether mask ventilation & intubation will be possible if patient is anesthetized & paralyzed
Pre Oxygenation by face mask for 3 minutes or 4 vital capacity 100% breaths
Rapid-Sequence-Intubation (RSI) Cricoid pressure – Sellick’s maneuver Intravenous Induction / Gaseous induction Followed by Suxamethonium (depolarizing muscle
relaxant) Laryngoscopy & visualization of larynx Insertion of endotracheal tube Inflation of the cuff Ventilation started Auscultation for breath sound in 5 areas
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1. Right infra- clavicular
3. Right infra- mammary
5. Gastric
2. Left infra- clavicular
4. Left infra-mammary
EtCO2 on the monitorCondensation of water vapor inside the tube Chest movement on ventilation Auscultation of breath sounds
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One assistant fixes the head
Another assistant provides Cricoid pressure
1. Pre-oxygenate all patients including children to whatever extent possible. This provides a buffer to tolerate an inability to ventilate / intubate for additional minutes.
2. Evaluate every airway carefully from history, physical examination. Keep in mind many small abnormalities add up to difficult airway.
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3. Have a back up plan formulated before the problem occurs.
4. Unless Suxamethonium is contra-indicated, consider using it.
5. Gain confidence & skill with variety of approaches to conscious (Awake) intubations, so it can be applied properly when needed.
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“The airway is your responsibility, and you, the patient and the patient’s loved ones suffer the consequences of misjudgments ”
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