ANTHONY MELENDEZ, BLAKE ATKINSON, JAKE CRAWFORD, & LORENZO WALTON.
Pediatric Airway Emergencies Elliot Melendez, MD Pediatric Emergency Medicine and Critical Care...
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Transcript of Pediatric Airway Emergencies Elliot Melendez, MD Pediatric Emergency Medicine and Critical Care...
Pediatric Airway Emergencies
Elliot Melendez, MDPediatric Emergency Medicine and Critical CareChildren’s Hospital, Boston
Disclosures
No financial disclosures
No conflict of interest
Outline
Discussion of stridor
Challenges of pediatric airway
Rapid assessment for difficult airway
Critical airway management strategies
Highest Acuity Patients
Precipitating Conditions
Respiratory Circulatory Sudden Cardiac
Resp. Distress
Respiratory failure
Shock
Cardiopulmonary Failure
Cardiac Arrest
Highest Acuity Patients
Precipitating Conditions
Respiratory Circulatory Sudden Cardiac
Resp. Distress
Respiratory failure
Shock
Cardiopulmonary Failure
Cardiac Arrest
Highest Acuity Patients
Precipitating Conditions
Respiratory Circulatory Sudden Cardiac
Resp. Distress
Respiratory failure
Shock
Cardiopulmonary Failure
Cardiac Arrest
Survival Data
Highest Acuity Patients
Precipitating Conditions
Respiratory Circulatory Sudden Cardiac
Resp. Distress
Respiratory failure
Shock
Cardiopulmonary Failure
Cardiac Arrest
Survival rates for resuscitation from: Resp arrest: 43 – 82% Cardiac arrest 4 – 14
%
Early recognition and treatment of respiratory compromise can improve outcome.
Case
6 month boy p/w fever and cough x 5 days
Cough is described as barky, and non-productive
Normal behavior, not irritable, decreased po’s
Case
VS: T 40.3, HR 150, RR 44, SaO2 95% on RA
Chest: coarse breath sounds, but no wheezing. Inspiratory stridor at rest without increased work of breathing
Remainder of exam unremarkable
Case
Decadron IM and racemic epinephrine neb were given with minimal improvement.
While in ED, biphasic stridor at rest with severe retractions, becomes toxic appearing. Some mild improvement to repeat racemic
epinephrine nebs Admitted to floor for observation
Case
Croup 6 mo to 6 years URI sxs Stridor +/- fever
Could there be an alternative diagnosis?
Stridor is the hallmark symptom associated with upper airway
disease
Rapid AssessmentHow Bad is it?
If distress is severe Ie. stridor at rest, cyanosis, severe retractions,
toxic appearing quickly examine and intervene
If stridor is mild: Then obtain a more complete and accurate
history develop a plan based on the differential
diagnosis
Stridor
Croup Clinical diagnosis Routine radiographs of neck or chest not indicated Dexamethasone therapy of choice for airway
edema If no stridor at rest, can send home
Who do you need to work-up?
Croup
When stridor is atypical for croup: Fixed stridor or isolated exhalatory stridor. Poor/No response to inhaled racemic
epinephrine and/or steroids
Extremes of age Greater than age 6, less than 6 month
Toxic appearing Persistently high fever. No viral prodrome, sudden onset
Work-up Atypical Stridor
Not all atypical stridor needs a work-up Admit and observe Physical Exam maneuvers Lateral and AP Neck CXR ENT consult
Physical Exam Maneuvers
Lay the infant Laryngomalacia worse with laying flat
Pass nasal catheter to determine the patency
Place in sniffing position and/or jaw thrust If the stridor lessens, obstruction may be at the
level of the larynx or higher
Atypical Stridor
Heavy drooling High fever Refusing to move
neck
Retropharyngeal Abscess
Typical presents 6-36 months
Look at prevertebral space
Complications include: Mediastinitis,
pericarditis, airway obstruction
Tip: Retropharyngeal swelling For C1-2
should be < ½ width of vertebral body
For C3-7 should be < width of
vertebral body False positives and
negatives: False (+): Flexion,
crying, +/- expiration False (-):
Parapharyngeal collection
Radiographs in Atypical StridorOther Findings
Steeple’s sign Thumb sign Radio-opaque foreign
bodies Mediastinal masses Congenital
anomalies
Steepling Analogies: Wine Bottles
BurgundyBordeaux
Steepling Analogies: NYC Buildings
Chrysler BuildingEmpire State Building
Steepling Analogies: NYC Buildings
Chrysler Building
Empire State Building
Radiographs in StridorOther Findings
Steeple’s sign Thumb sign
Epiglottitis Radio-opaque foreign
bodies Mediastinal masses Congenital
anomalies
Radiographs in StridorOther Findings
Steeple’s sign Thumb sign Radio-opaque foreign
bodies Mediastinal masses Congenital
anomalies
Radiographs in StridorOther Findings
Steeple’s sign Thumb sign Radio-opaque foreign
bodies Mediastinal masses Congenital
anomalies
Radiographs in StridorOther Findings
Steeple’s sign Thumb sign Radio-opaque foreign
bodies Mediastinal masses Congenital
anomalies
Radiographs in StridorOther Findings
• Steeple’s sign• Thumb sign• Radio-opaque
foreign bodies• Mediastinal
masses• Congenital
anomalies
Right Sided Aortic Arch Aberrant left
subclavian artery gives rise to ductus arterious and compresses trachea
Surgery involves clipping of ligamentous arterious
Case
Worsened distress in AM Taken to the OR and DL performed.
Pus seen in trachea, intubated Culture grew Staph Aureus
Started on Unasyn (pre-MRSA) and improved
Bacterial Tracheitis
Pathology H. influenzae B was most common prior to
1992 or in unimmunized immigrants Staph Aureus most common, usually
superinfection. Other: GAS, pneumococcus, mycoplasma
AP neck x-ray: may show “thumb print” sign subtle
Patient Has Resp Compromise
You decide airway needs to be secured…..
Preparation? Equipment - SOAP ME Personnel
Prepare Equipment
S: Suction Catheters (6 - 16 french) and Yankauer tips (two sizes)
O: Oxygen and how to deliver Nasal cannula, oxygen flow, masks and appropriate bag
A: Airway Appropriate ETT, oral/nasal airway, stylets, laryngoscopes
P: Pharmacology RSI meds
ME: Monitoring equipment EtCO2 detector, stethescope, monitors
Artificial Airway Oral
Tip of mouth to corner of mandible
Artificial Airway
Nasal Nostril to tragus
Appropriate Size is Key
Correct size Incorrect size
(Atlas of Airway Management, 2007)
Endotracheal Tubes
Age Size (Inner Diameter, mm)
Premature 2.5
Term to 3 mo 3.0
3 to 7 mo 3.5
7 to 15 mo 4.0
15 to 24 mo 4.5
2 to 15 yr
Internal diameter = [16 + age (yr)]/4 (round to the nearest 0.5 mm)(maximum 8.0)
Depth = ETT x 3 (lip)
Cuffed vs. Uncuffed?Prospective observational studies
No difference in the incidence of post-extubation stridor between 95 children intubated with uncuffed and 93 with cuffed ET tubes Deakers, TW, Reynolds, G, Stretton, M, et al. Cuffed
endotracheal tubes in pediatric intensive care. J Pediatr 1994;125:57.
No difference in use racemic epi for post-extubation subglottic edema between 387 children intubated with uncuffed and 210 with cuffed ET tubes Newth, CJ, Rachman, B, Patel, N, Hammer, J. The use of cuffed
versus uncuffed endotracheal tubes in pediatric intensive care. J Pediatr 2004; 144:333.
Cuffed vs. Uncuffed?Khine HH, et al - Anesthesiology 1997
Full-term newborns through 8 yr (n = 488) Cuffed tube sized by a new formula = (age/4) + 3 Uncuffed tube modified Cole's formula = (age/4)
+ 4
Conclusion Formula for cuffed tube selection is appropriate Advantages of cuffed endotracheal tubes Avoidance of repeated laryngoscopy Cuffed tubes may be used routinely during controlled
ventilation in full-term newborns & children for anesthesia
Cuffed vs. Uncuffed?
Cuffed ET tubes may be placed by experienced intubators Except neonatal Size should be 0.5 – 1 mm smaller
Cuffed ET tube preferred for those with: Severe lung disease High ventilator pressures Bronchospasm or chronic lung disease Preferred by critical care physicians
Equipment: Blade and Tube Size
Age Blade/SizeInfant Miller 1
2 years old Miller 2
12 years old Miller/Mac 3
“Switch to a 2 at 2”
Prepare Personnel
Respiratory therapy, nurses, pharmacy
Assignment of roles Watch monitor Administer meds Sellick maneuver, Pull lip Pass ETT, aAttaching EtCO2
What are the particular issues in pediatrics which can effect airway management?
Pediatric Airway Issues
Airway management has it challenges…. Anatomic Physiologic Relatively less experience One size does not fit all
Anatomy
Occiput Relatively larger occiput causes passive flexion of c-
spine. Interferes with attempts to align the oral,
pharyngeal, and tracheal axes for visualization
Anatomy
Alignment Oral axis Pharyngeal axis Laryngeal axis
Anatomy
Marx: Rosen's Emergency Medicine: Concepts and Clinical Practice, 6th ed., Copyright © 2006 Mosby, Inc.
Anatomy
Position of larynx In infants and children is
more anterior and superior than adults
More acute angle between the epiglottis and the glottic opening
Anatomy
Tongue Large compared to the
size of the oral cavity
Epiglottis Relatively large and
floppy in infants Epiglottis covers more
of the glottic aperture
Physiologic: Edema Effects
Poiseuille’s lawPoiseuille’s law
Physiologic ConsiderationsMore rapid cardiopulmonary decline
Increased risk of upper airway obstruction Prone to bradycardia
Laryngeal stimulation and hypoxia Higher oxygen consumption Lower functional residual capacity
Less oxygen reserve
Physiologic differences:Clinical evidence
(Patel et al., Can J Anaesth, 1994)
Relatively Less Experience
Adult Emergency Department Levitan, Acad Emerg Med, 2001 50,000 patients per year 500 airways/year
Pediatric Emergency Department Children’s Hospital, Boston data 50,000 patients per year 50 airways/year
Evaluating for the Difficult Airway
Case
11 mo brought to ED after dad was feeding child with edamame
Case
Mother heard coughing and gagging on child monitor
EMS called
Evaluation and Management
Evaluation Sudden onset Inspiratory stridor at
rest No fever Clear lungs High suspicion for
airway F.B.
Management LEAVE HIM ALONE!
No IV placement Remained in mother’s
lap ENT called stat
Recognition of Difficult Airway
Suspected/Known Craniofacial anomolies Croup/Epiglottis Vascular malformations Foreign body Mediastinal mass Cervical/Thoracic
abnormalities Facial/Oral Trauma
Recognition of Difficult Airway
Predictors - LEMON Look
Short neck, large tongue, micrognathia Evaluate 3-3-2
3 finger breadths of mouth opening 3 finger breadths submental to hyoid 2 finger breadths hyoid to thyroid
Mallampati Obstruction Neck mobility
Predict 100% success in AdultsNot validated in pediatrics
Predictors - LEMON Look
Short neck, large tongue, micrognathia
Evaluate 3-3-2 3 finger breadths of mouth opening 2 finger breadths submental to
hyoid (potential displacement area) 2 finger breadths hyoid to thyroid
Mallampati Obstruction Neck mobility
Historical Factors
Small jaws Congenital myopathies Pierre-Robin sequence, Crouzon
Large tongues Beckwith-Weiderman syndrome Infiltrative d/o’s – mucopolysaccharidosis Trisomy 21
Risk of malignant hyperthermia Duchene’s MD 25% Noonan’s syndrome >50%
Historical Factors
Small jaws Congenital myopathies Pierre-Robin sequence, Crouzon
Large tongues Beckwith-Weiderman syndrome Infiltrative d/o’s –
mucopolysaccharidosis Trisomy 21
Risk of malignant hyperthermia Duchene’s MD 25% Noonan’s syndrome >50%
Historical Factors
Small jaws Congenital myopathies Pierre-Robin sequence, Crouzon
Large tongues Beckwith-Weiderman syndrome Infiltrative d/o’s – mucopolysaccharidosis Trisomy 21
Risk of malignant hyperthermia Duchene’s MD 25% Noonan’s syndrome >50%
Known/Suspect Difficult AirwayManagement
Easy! Call for help
The difficult pediatric airway is best NOT managed by heroic or uncommonly used techniques
Carefully assess and plan Children with chronic/congenital issues has typically
been intubated in past check anesthesia records if time permits
Anticipate difficulties and prepare suitable back-up plan Call ahead, or know how to reach quickly, the
anesthesiologists and surgeon on-call
Case Scenario
Called to transport full term newborn with respiratory distress
Intubated at OSH with 3.0 uncuffed ETT
On team arrival, poor chest movement on high vent settings and audible air leak Decision to change ETT to 3.5 uncuffed
Clinical Decision Making
Options: Sedate, muscle relax Increase vent settings Direct laryngoscopy for tube position
Reintubate with larger tube, and/or cuffed tube
Goals of Larynoscopy What we want to see is this
Goals of Laryngoscopy The problem is…
…but we are here.
Cords are here…
Goals of Laryngoscopy
The problem is…
The aim is… To “see around the
corner”
• The goal of DL…• To get rid of the corner• To create straight line of
sight
Goal: Visualizing the CordsAligning the 3 Axes
Oral axis
Pharyngeal axis
Tracheal axis
Oral
Pharyngeal
Tracheal
Goal: Visualizing the CordsAligning the 3 Axes
Oral axis
Pharyngeal axis
Tracheal axis
Case Course
Under DL, visualized ETT through vocal cords, and removed.
3.5 uncuffed ETT passed easily through vocal cords
Bag-ETT performed with no chest rise, and immediate desaturation Recurs x4
In between, easy bag-mask with chest rise
Unrecognized Difficult AirwayManagement
Are you able to mask ventilate and oxygenate?
Difficult Intubation
Interventions Upgrade intubator Bag mask until advanced airway
interventions can be instituted Alternative modes
Difficult Airway
Difficult Mask Ventilation: inability to maintain SpO2 > 90% using 100%
oxygen and BMV
High risk Not only loss of airway, but risk of loss of vital
signs
Difficult Mask
Difficult Mask after failed intubation Move quickly to
alternative Immediate best
intubator Immediate to
alternative modes Fiberoptic, surgical
airways time consumption Rarely done Technically difficult in
peds
Alternative:Laryngeal Mask Airway
1981 - Dr. Archie Brain Royal London Hospital
Initially developed as a rescue tool
Laryngeal Mask Airway
LMA Size Patient Size
1 Neonate / Infants < 5 kg
1 ½ Infants 5-10 kg
2 Infants / Children 10-20 kg
2 ½ Children 20-30 kg
3 Children/Small adults 30-50 kg
4 Adults 50-70 kg
5 Large adult >70 kg
LMA: Insertion
Figure 42-10 Insertion of the laryngeal mask airway (LMA). A, The tip of the cuff is pressed upward against the hard palate by the index finger while the middle finger opens the mouth. B, The LMA is pressed backward in a smooth movement. Notice that the nondominant hand is used to extend the head. C, The LMA is advanced until definite resistance is felt. D, Before the index finger is removed, the nondominant hand presses down on the LMA to prevent dislodgment during removal of the index finger. The cuff is subsequently inflated, and outward movement of the tube is often observed during this inflation. (Courtesy of LMA North America, Inc., San Diego, CA.)
Mgmt of the Critical Airway
Can’t ventilate Can’t intubate
LMA contraindication (massive orofacial trauma) or not working
Cricothyrotomy < 5 years old
Needle cricothyrotomy and bag ventilation 5 to 10 years old
Needle cricothyrotomy and bag ventilation If oxygen saturation is inadequate: transtracheal
jet ventilation regulated to low PSI > 10 years
Operator preference Needle cricothyrotomy with TTJV or Surgical
cricothyrotomy
Percutaneous Transtracheal Ventilation
Beneficial for children who cannot be “ventilated” by other route
Experience level with this procedure is minimal
Percutaneous Transtracheal Ventilation
3-5cc syringe: 1-2cc saline OR 12- or 14-gauge IV
Summary
Pediatric airway emergencies are common
Stridor is the hallmark of an upper airway obstruction, thus emergency
Potential for difficult airway is high in pediatrics Identify resources, anticipate problems Familarize yourself with alternative techniques
Thank You!!!
Questions??