pediatric airway emergencies - university of … airway emergencies the university of texas medical...
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Pediatric Airway Emergencies
The University of Texas Medical Branch Department of Otolaryngology,
Grand Rounds Presentation November 23, 2005
Steven T. Wright, M.D. Faculty Advisor: Seckin Ulualp, M.D.
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ASA Task Force on Management of the Difficult Airway - Definitions: difficult airway = the clinical situation in which a conventionally
trained anesthesiologist experiences difficulty with mask ventilation, difficulty with tracheal intubation, or both.
difficult mask ventilation = (1) inability of unassisted anesthesiologist to maintain SpO2 > 90% using 100% oxygen and positive pressure mask ventilation in a patient whose SpO2 was 90% before anesthetic intervention; or (2) inability of the unassisted anesthesiologist to prevent or reverse signs of inadequate ventilation during positive pressure mask ventilation.
difficult laryngoscopy = not being able to see any part of the vocal cords with conventional laryngoscopy
difficult intubation = proper insertion with conventional laryngoscopy requires either (1) more than three attempts or (2) more than ten minutes
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Pediatric PeriOperative Cardiac Arrest (POCA) Registry
Collects data from 63 large institutions to correlate perioperative pediatric deaths and anesthesia
The majority are medication related cardiac deaths
1998-2003: Respiratory events increased from 20 percent to 27 percent.
The most common event leading to cardiac arrest in this category was laryngospasm, followed by airway obstruction, inadequate oxygenation, inadvertent extubation, difficult intubation and bronchospasm.
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Pediatric Airway Emergencies
Infrequently encountered Stridor History and Physical Examination Multiple Etiologies
Congenital Inflammatory Iatrogenic Neoplastic Traumatic
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Urgency
Must assess the urgency of the situation Full and frank discussion of the risks with
the parents (and child if appropriate) including tracheostomy and failure to secure the airway
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Anatomy Infant larynx:
-More superior in neck -Epiglottis shorter, angled more over glottis -Vocal cords slanted: anterior commissure more inferior - Vocal process 50% of length
-Larynx cone-shaped: narrowest at subglottic cricoid ring -Softer, more pliable: may be gently flexed or rotated anteriorly
Infant tongue is larger Head is naturally flexed
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History
Assess the urgency of the situation Simultaneous History and Physical
Choking Aggravating factors
• Feeding, sleeping, positioning Throat or neck pain Birth history
• Prenatal
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Signs of impending respiratory failure Increased respiratory rate Nasal flaring Use of accessory muscles Cyanosis
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Physical Examination Stridor
Stertor Bulky oropharyngeal noise Inspiratory, expiratory, or both
Supraglottic Inspiratory
Glottic Inspiratory progressing to biphasic
Subglottic Inspiratory progressing to biphasic
Tracheal Expiratory
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Flexible Laryngoscopy:
Proper Equipment Assess
nares/choanae Assess adenoid and
lingual tonsil Assess TVC mobility Assess laryngeal
structures
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Radiology:
Plain films: Chest and airway AP and
lateral Expiratory films
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Airway Flouroscopy
Quick, noninvasive, and dynamic study Supraglottic: 33% Glottic: 17% Subglottic: 80% Tracheal: 73% Bronchial: 80%
Far superior to plain films Disadv: radiation exposure
10 rads (0.1Gy) per 1 minute
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MRI/CT
Usually not useful in an acute setting More reliable for evaluating neck masses
and congenital anomalies of the lower airway and vascular system
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Treatment Options
Heliox Oral Airways Intubation
Endotracheal Laryngeal Mask
Tracheostomy EXIT procedure
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Heliox Graham’s Law: flow rate
is inversely proportional to the square root of its density
Helium 7x less dense than Nitrogen
Shown to be effective in upper airway obstruction, viral croup, postextubation stridor
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Heliox
Gosz et al: Immediate positive response in 73% of
patients Average duration of treatment 15min to 384
hours (overall mean of 29.1hrs) Laryngotracheobronchitis were more likely to
respond than other causes. (other causes were upper airway obstruction, postextubation stridor, congenital heart disease)
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Endotracheal Intubation
Multicenter study 156 out of 1288 total ED intubations
Rapid Sequence Intubation (81%) Without medications (16%) Sedation without neuromuscular blockade (6%)
Overall successful intubations RSI 99% Non RSI 97%
Only 1 out of 156 required surgical intervention
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Rapid Sequence Intubation
Recommended for every emergency intubation involving a child with intact upper airway reflexes by the Pediatric Emergency Medicine Committee of the American College of Emergency Physicians
Simultaneous administration of a neuromuscular blockade agent and a sedative
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Intubation Rule of 4’s: Age+4/4 = ETT size
Mucosal injury at 25cm of pressure. Therefore, always check for leak.
Spontaneous ventilation: allows for a limited examination of the dynamics of
vocal cord motion. Apneic technique:
Turn to FiO2 100% prior to extubation. 6L O2/min flow via laryngoscope General rule to work apneic in a proportional
amount of time as reoxygenation.
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Laryngeal Mask Airway
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Tracheotomy Cricothyroidotomy is
difficult b/c of small membrane and flexibility
Early complications Pneumothorax, bleeding,
decannulation, obstruction, infections
Late complications Granuloma, decannulation,
SGS, tracheocutaneous fistula
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EXIT Procedure (ex utero intrapartum treatment)
Prenatal diagnosis is crucial Flattened diaphragms,
polyhydramnios The head, neck,
thorax, and one arm are delivered.
Uteroplacental circulation can be maintained for 45-60 minutes
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Specific Etiologies of Airway Emergencies
Congenital Neck Masses Congenital anomalies Syndromic patients Inflammatory Foreign Bodies
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Congenital Neck Masses
Dermoid cysts Mesoderm/ectoderm
Teratoid cysts and teratomas All 3 layers 20% incidence of
maternal polyhydramnios
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Congenital Neck Masses
Lymphangiomas Capillary, cavernous,
cystic types More airway
obstructive when found in the anterior triangle
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CHAOS (congenital high airway obstruction syndrome)
Emergent airway management at the time of delivery is key for survival
Prenatally Flattened diaphragms, polyhydramnios, cervical mass
TEAM Members Maternal-fetal specialist Neonatalogist Anesthesiologist Otolaryngologist Patient
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Laryngotracheobronchitis (Croup)
Parainfluenza type 1 Generalized mucosal
edema of the larynx, trachea, bronchi
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Laryngotracheobronchitis Treatment
Humidification No scientific data to support May worsen the situation
Racemic Epinephrine Reduces mucosal edema/bronchial relaxation
Steroids Systemic vs. Inhaled
Intubation
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Bacterial Tracheitis Complication of viral
laryngotracheobronchitis
Fever, white count, respiratory distress following a complicated course of croup
Staphylococcus aureus
Endoscopy and Intubation
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Acute Supraglottitis Mild URI that
progresses over a few hours to severe throat pain, drooling, and fever
H. influenza, parainfluenza
Treatment Intubation Empiric Abx
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Congenital Syndromes
Close embryological development of the airways and the craniofacial structures
Early complications are usually more profound
Late complications may be more subtle
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Congenital Syndromes and Airway Emergencies
Syndromes of facial anomalies Pierre Robin Sequence Treacher Collins Goldenhar/Hemifacial microsomia
Deformities of skull shape Crouzon’s/Apert’s Pfieffer
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Pierre Robin Sequence Micrognathia, relative
macroglossia with or without cleft palate
Intubation via the lateral tongue approach
Tracheotomy Glossopexy Subperiosteal release
of mandible
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Treacher Collins Hypoplastic cheeks,
zygomatic arches, and mandible;
Microtia with possible hearing loss;
High arched or cleft palate; Macrostomia (abnormally
large mouth); Colobomas; Increased anterior facial
height; Malocclusion (anterior open
bite); Small oral cavity and airway
with a normal-sized tongue;
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Goldenhar & Hemifacial Microsomia
Oculoauricular dysplasia Limited atlanto-occipital extension
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Klippel-Feil
Congential fusion of any 2 of the 7 cervical vertebrae
Short, immobile neck
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Crouzon’s/ Apert’s Abnormal closure of the
cranial sutures Nasal cavity
Nasophayrngeal stenosis- leads to OSA
Associated anomalies SGS Tracheal sleeves
Treatment Nasal decongestants/
stents Selective
adenoid/tonsillectomy Tracheostomy Midface advancement
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Mucopolysaccharidoses
Hunter’s, Hurler’s, Marateaux-Lamy
Progressive infiltration of MPS within the airway structures
Treatment Tracheostomy Death by age 10-15
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Down’s Syndrome Midface hypoplasia, macroglossia, narrow
nasopharynx, and shortened palate. Immature immune system Tendency towards obesity GERD is very prominent Equals a very difficult patient to sedate and still
maintain an airway Longer lifespan of these patients leads to an
increase in the incidence of CHF and pulmonary hypertension secondary to OSA
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Down’s Syndrome Mitchell et al. 23 Downs Patients
48% OSA 43% Laryngomalacia
Systemic comorbidities 61% GERD
Cause of Upper airway obstruction is age related <2yrs old: laryngomalacia is most common cause
• Age dependent progression to OSA >2yrs old: OSA is most common cause
• Delay in diagnosis is common because symptoms overlap
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Down’s Syndrome Jacobs et al. 55 of 71 patients underwent upper airway surgery (all had DL/B at
the same time) 44 T&A with pillar plication, 4 UPPP
Overall: 76% had significant or complete relief 24% had moderate or severe residual symptoms
Failures: Greater number of obstructive sites
• Laryngotracheal stenosis (23% of failures) • Tongue base
More severe UAO Recommendations:
Comprehensive preoperative airway evaluation Tailor the surgical procedure for the site of obstruction Close follow up for failures
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Choanal Atresia Failure of the breakdown
of the buccopharyngel membrane
McGovern Nipple and nasogastric feeding
CHARGE association Colobomas Heart abnormalities Renal anomalies Genital abnormalities Ear abnormalities
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Foreign Bodies
2-4year olds Acute episode of choking/gagging Triad of acute wheeze, cough and
unilateral diminished sounds only in 50% 5-40% of patients manifest no obvious
signs
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Foreign Bodies Severity is determined by
complete vs partial obstruction
Peanuts are most common
Right mainstem Larger diameter More airflow than left Narrow angle of divergence Carina sits on the left side
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Foreign Bodies
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Foreign Bodies
Plain radiography: 25% of bronchial lesions and >50% of
tracheal lesions do not show up Airway Flouroscopy:
Above the carina: 32-40% Below the carina: 80-90%
DL/B: Gold Standard
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Airway Foreign Bodies