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Airway Management in Transport Toni Petrillo-Albarano, MD Pediatric Critical Care Medicine Children’s Healthcare of Atlanta at Egleston Children’s Hospital Objectives Overview of the differences between the pediatric and adult airway Intubation of the pediatric patient Anatomic Considerations in Pediatrics Relatively Large Occiput Large Tongue Larynx is anterior and superior Epiglottis may be floppy with acute angle Narrowest portion is cricoid cartilage The Basics The airway in any patient can be: Physiologic • maintained easily or with effort by the patient Maintainable • with some assistance/positioning Invasive Intervention • oral airway, nasal trumpet, or intubation The Basics To assist patient’s in maintaining an airway: Clear mouth Position head Consider Airway adjuncts Proper Positioning A jaw thrust or head tilt maneuver will position the tongue so that it will not obstruct the airway Remember that a child has a relatively large tongue compared to an adult In infants it is possible to hyperextend the neck too much and cause the soft tissue to obstruct the airway Nasal Trumpet A nasal trumpet can be a useful adjunct possible for the trumpet to be too long or too short Oral Airway An appropriately placed oral airway will pull the tongue forward and provide an unobstructed airway If the oral airway is too long, it will stimulate a gag. If it’s too short, it will not lift the tongue. Airway Adjuncts The use of airway adjuncts, such as the nasal trumpet and oral airway, will only provide an adequate airway. The patient must have reasonable respiratory effort. If the patient is unable to maintain adequate ventilation, he/she should be bagged or proceed to endotracheal intubation. Indications for Intubation 1. Unable to protect airway 2. Inadequate ventilation 3. Hypoxemic respiratory failure requiring positive pressure 4. Therapeutic (e.g. Hyperventilation in head injury) Difficult Airway Considerations Short, muscular neck Receding mandible Protruding incisors Uvula not visualized Limited TMJ mobility Limited C-spine mobility What do you need? Monitors -- cardiac and pulse oximetry Suction -- Yankauer or catheter Machine -- ventilator or bag/mask Airway -- Endotracheal tube Intravenous -- peripheral or central line Drugs -sedation/analgesia/paralysis/atropine Laryngoscopes Straight Curved Fiberoptic Proper visualization The laryngoscope should be used to lift “up and out”. Do not rock back on upper teeth. Curved blade tip is placed in vallecula and will lift epiglottis away from airway. Straight blade tip is used to hold the epiglottis from beneath. Proper ETT Size Newborn - 6 months 6 months - 1 year > 1 year 3.5 4.0 4 + age 4 Intubation Procedure Prepare Equipment Position patient • Table height • “Sniffing” position Pre-oxygenate • 4 max breath in 30 sec • 100% O2 for 3-5 min Induction agent • sedative/analgesic Neuromuscular blocker Intubation • Laryngoscope in L hand • Insert on R of mouth and sweep tongue to L • Advance in midline until epiglottis visualized • Advance tip of blade – into vallecula (curved blade) – beneath epiglottis (straight blade) • Lift towards feet – “up and out”, “Never Lever” Rapid Sequence Intubation Done when immediate airway stabilization is required or the patient has a “full stomach” • has eaten -- pregnancy • trauma -- abdominal mass • GER -- misc • bowel obstruction Expedited with rapid acting drugs and avoidance of bag mask ventilation Rapid Sequence Intubation Procedure • Pre-oxygenate • Rapid Induction Agents • Rapid Acting Neuromuscular Blocker • Sellick’s Maneuver • Intubate • Check breath sounds, inflate cuff (if applicable) • Release cricoid pressure Sellicks’ Maneuver Cricoid Pressure Closes esophagus against the vertebral column protects against passive regurgitation DO NOT release until airway is secure ! Intubation Medications Goals: Provide adequate intubation conditions • airway easily visualized • patient comfort (not fighting procedure) Avoid complications • hemodynamic instability • ICP in head injury Atropine Blunts vagal response that can cause bradycardia and dries oral secretions Dose = 0.02 mg/kg (min 0.1 mg) Adverse effects • • • • tachycardia mydriasis atropine flush disorientation Benzodiazepines Effective in providing anxiolysis and amnesia Onset and duration vary between midazolam, lorazepam, and diazepam Dose = 0.1 mg/kg Adverse Effects include: hypotension and myocardial depression Fentanyl Sedative/Analgesic Dose 2-5 mcg/kg Rapid Onset and short duration -- thus an excellent intubation med Virtually no CV side effects Ketamine PCP Derivative, Dissociative Hypnotic Rapid Onset and short duration Dose = 1-2 mg/kg IV or 2-4 mg/kg IM Increases HR, and BP and thus may be ideal for the patient with shock. Increases cerebral metabolic rate and ICP and thus not a good choice in head injury or seizure Thiopental (Pentothal) Dose = 2-5 mg/kg Max Effect in 60 seconds Sedative Hypnotic that decreases cerebral metabolic rate and ICP Hypotension and Myocardial Depression are possible adverse effects Etomidate Ultra short-acting non-barbiturate hypnotic rapid induction of anesthesia with minimal cardiovascular effects 0.2-0.6 mg/kg over 30-60 seconds Peak effect: 1 minute Duration of action: 3-5 minutes Can cause adrenal suppression Neuromuscular Blockers Recommend • • • • • only rapid acting agents: Succinylcholine - dose = 1 mg/kg IV Rocuronium - dose = 0.6-1.2 mg/kg IV Vecuronium - dose = 0.1-0.3 mg/kg IV Mivacurium - dose = 0.2 mg/kg IV Atracurium - dose = 0.2 mg/kg IV Recommended Intubation “Cocktails” Controlled Intubation • • • • Fentanyl & Lorazepam or Etomidate Vecuronium/Rocuronium + Atropine Head Injury • • • • Pentothal or Etomidate Lidocaine 1 mg/kg IV Vecuronium Atropine Septic Shock • Atropine • Ketamine • Rocuronium/Vecuronium Status Asthmaticus • • • • Atropine Ketamine Lorazepam Rocuronium/Vecuronium Physiologic Response to Intubation Airway Reflexes • Laryngospasm • Cough • Gag Cardiovascular Reflexes • • • • Sinus bradycardia Tachycardia Hypertension Dysrhythmias Assessing ETT placement Direct visualization ETCO2 (digital readout or color paper) Chest rise Auscultation (be certain to confirm absence of gastric breath sounds) ETT vapor (unreliable) Chest X-ray Monitoring on Transport Physical Exam EKG monitor Pulse oximeter ETCO2 Monitor Reevaluate Frequently Capnograms Normal Zero baseline Rapid, sharp up rise Alveolar plateau Well-defined end-tidal Rapid, sharp down stroke A—B B—C C—D D D—E Deadspace Dead space and alveolar gas Mostly alveolar gas End-tidal point Inhalation of CO2 free gas Capnography Sudden loss of waveform Esophageal intubation Ventilator disconnect Ventilator malfunction Obstructed / kinked ETT Capnography Decrease in waveform Sudden hypotension Massive blood loss Cardiac arrest Hypothermia PE CPB Capnography Gradual increase in waveform Increased body temp Hypoventilation Partial airway obstruction Exogenous CO2 source (w/laparoscopy/CO2 inflation) Capnography Sudden drop – not to zero Leak in system Partial disconnect of system Partial airway obstruction ETT in hypopharynx Capnography Sustained low EtCO2 Asthma PE Pneumonia Hypovolemia Hyperventilation Low ETCO2, but good plateau 40 30 Capnography Cleft in alveolar plateau Partial recovery from neuromuscular blockade 40 Capnography Transient rise in ETCO2 Injection of bicarbonate Release of limb tourniquet 40 Capnography Sudden rise in baseline Contamination of the optical bench – need to recalibrate 40 Questions 1. Which drug is not used in the intubation of a head injury patient? • • • • A. Ketamine B. Thiopental C. Lidocaine D. Etomidate Question 2.Capnograph represents A. Esophageal intubation B. Ventilator disconnect C. Obstructed / kinked ETT D. All of the above Question 3. Appropriate ETT size for a 6 year old calculated by formula is? • • • • A. 6.0 B. 4.5 C. 5.0 D. 5.5 Question 4. True or False: • Curved blade tip is placed in vallecula and will lift epiglottis away from airway Question 5. All of the following are indications for intubation except: • A. Unable to protect airway • B. Inadequate ventilation • C. Hypoxemic respiratory failure requiring positive pressure • D. GCS 10