DIFFICULT AIRWAY IN THE ICU Dr Anitha Shenoy Professor and Head of Anaesthesiology Kasturba Medical College, Manipal.

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Presentation transcript:

DIFFICULT AIRWAY IN THE ICU Dr Anitha Shenoy Professor and Head of Anaesthesiology Kasturba Medical College, Manipal

Difficult Airway In The ICU Hypoxic patient Cardiac arrest Equipment unavailability Insufficient training

Definitions Ref: ASA Taskforce Anesthesiology 2003; 98:1269–77

Difficult airway A clinical situation in which a conventionally trained anaesthesiologist experiences difficulty with face mask ventilation, tracheal intubation or both.

Difficult face mask ventilation It is not possible for the anesthesiologist to provide adequate face mask ventilation due to :  inadequate mask seal  excessive gas leak or  excessive resistance to the ingress or egress of gas.

Signs of inadequate face mask ventilation include:  Absent or inadequate chest movement / breath sounds  Auscultatory signs of severe obstruction  Gastric air entry or dilatation  Decreasing or inadequate SpO 2  Absent or inadequate exhaled CO 2 and  Haemodynamic changes associated with hypoxaemia or hypercarbia (e.g., hypertension, tachycardia, arrhythmia).

Difficult laryngoscopy It is not possible to visualize any portion of the vocal cords after multiple attempts at conventional laryngoscopy. Difficult tracheal intubation Tracheal intubation requires multiple attempts, in the presence or absence of tracheal pathology. Failed intubation Placement of the endotracheal tube fails after multiple intubation attempts.

Assessment

ASSESSMENT OF AIRWAY History and Physical examination: To detect medical, surgical and anaesthetic factors hinting a difficult airway. Previous anesthetic records The test: One finger into the temporomandibular joint Two-finger breadths’ distance between the upper and lower incisors Three-finger breadths’ distance from the chin to the thyroid cartilage.

Modified Mallampati Classification of the airway

These classes roughly correlate with the following grades of laryngoscopic views. Difficult intubation is anticipated with Mallampati Class III and IV. Modified Cormack and Lehane grading of laryngoscopic view

Neck movements Goniometer

Full range of neck movements > 90° - Normal ° - Slight restriction < 80° - Severe restriction

Neck Extension Grade I : > 35° Normal Grade II : 22°-34° Grade III : 12°-21° Grade IV : < 12°

Anticipated Difficult mask ventilation

Anticipated Difficult Intubation

Anticipated difficult intubation

Anticipated difficult intubation - Awake

Anticipated difficult intubation

Anticipated difficult intubation - Awake Choices for intubation  Flexible fibreoptic intubation  Blind nasal intubation  Retrograde intubation  Tracheostomy (Take consent in advance)

Unanticipated difficult intubation - A naesthetised Can ventilate, difficult to intubate Essentially Same as Before !!!

Plan D Plan C Plan BPlan A

Anticipated difficult intubation - A naesthetised

Plan A Initial tracheal intubation plan Direct Laryngoscopy Tracheal intubation Succeed Failed intubation Plan B Variety of laryngoscopes, endotracheal tube guides, lighted stylets Anticipated difficult intubation - A naesthetised

Direct Rigid laryngoscopes CLM Laryngoscope

Direct Rigid laryngoscopes Glidescope

Indirect Rigid laryngoscopes Bullard Laryngoscope Upsher Laryngoscope

Endotracheal tube guides Gum Elastic Bougie Frova Introducer Aintree Introducer Cook Airway Exchange Flextip Catheter

Lighted stylets Trachlight Bonfils Shikani Optical Stylet (SOS)

Plan B Secondary tracheal intubation plan ILMA, LMA Confirm, FOB guided tracheal intubation Succeed Failed oxygenation Plan C Variety of supraglottic airways Anticipated difficult intubation - A naesthetised

Supraglottic airway devices Intubating Laryngeal Mask Airway (ILMA) ProSeal Laryngeal Mask Airway (PLMA)

Supraglottic airway devices Ambu Laryngeal Mask Airway

Supraglottic airway devices Combitube®

Supraglottic airway devices Laryngeal Tube Pharyngotracheal Lumen Airway (PLA)

Plan C Maintenance of oxygenation, ventilation, postponement of surgery and awakening Revert to face mask, oxygenate and ventilate Postpone surgery Failed oxygenation Succeed Plan D Variety of supraglottic airways Anticipated difficult intubation - A naesthetised

Plan D Rescue techniques for ‘can’t intubate, can’t ventilate’ situation LMA Awaken patient Improved oxygenation Increasing hypoxaemiaCricothyroidotomy Variety of infraglottic airways Anticipated difficult intubation - A naesthetised

Unanticipated difficult intubation - A naesthetised Cannot ventilate, cannot intubate

Failed intubation and difficult ventilation Face mask Oxygenate and ventilate Maximum head extension Maximum jaw thrust Assistance with mask seal Oral  6 mm nasal airway Reduce cricoid force – If necessary Call for help !!! Unanticipated difficult intubation - A naesthetised Cannot ventilate, cannot intubate Failed oxygenation with face mask ? (SpO 2 > 90%) with FIO 2 = 1

Cannot intubate, cannot ventilate … ILMA, LMA Oxygenate and ventilate patient Maximum 2 attempts at insertion Reduce any cricoid force during insertion Succeed Oxygenation satisfactory and stable: Maintain oxygenation and awaken patient Cannot intubate, Cannot ventilate Plan D

Plan D: Rescue techniques for ‘cannot intubate, cannot ventilate’ situation Cricothyroidotomy  Needle  Cannula  Surgical Increasing hypoxaemia Variety of infraglottic airways Cannot intubate, cannot ventilate …

Infraglottic airway devices Enk Oxygen Flow Modulator

Infraglottic airway devices Melker Cricothyrotomy Cannula Arndt’s Cricothyrotomy set

Infraglottic airway devices Quicktrach

Unanticipated difficult intubation – A naesthetised and full stomach

Plan A Initial tracheal intubation plan Direct Laryngoscopy Failed intubation Tracheal intubation Succeed Plan C (Face mask) Maintenance of oxygenation, ventilation, postponement of surgery and awakening No Plan B ProSeal LMA ?

Unanticipated difficult intubation – A naesthetised and full stomach Plan D Rescue techniques Increasing hypoxaemiaCricothyroidotomy Variety of infraglottic airways LMA Improved oxygenation Awaken patient

Oxygenate Visualisation Ventilation Intubation Oxygenation Chain of survival for the airway VIVO

Infraglottic airway obstruction ??

Approach to Difficult Airway

Difficult Airway Equipment  Direct laryngoscopes  Indirect laryngoscopes  Endotracheal tube guides  Lighted stylets  Supraglottic airway devices  Infraglottic airway devices

Difficult airway cart

Pulse oximetry Capnography

Difficult airway trainers Sheep trachea Critical Airway Management Trainer

Medic Alert !!!