Airway Management in Anesthesia

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Questions and Answers

What is the primary purpose of pre-oxygenation before the induction of general anesthesia?

  • To increase the concentration of nitrogen in the patient's lungs.
  • To decrease the patient's FRC.
  • To create a 100% concentration of oxygen in the patient’s FRC. (correct)
  • To reduce the safety margin for intubation.

What step immediately follows pre-oxygenation in standard airway management?

  • Induction of general anesthesia. (correct)
  • Insertion of a supraglottic airway.
  • Taping the patient's eyes shut.
  • Application of cricoid pressure.

What is the purpose of using a stylet when preparing an endotracheal tube (ETT)?

  • To lubricate the ETT.
  • To test the cuff on the ETT.
  • To inject the cuff with 10ml of air.
  • To shape the ETT into a "hockey stick" position for insertion. (correct)

Which of the following best describes the Sellick maneuver?

<p>Posterior displacement of the cricoid cartilage against the cervical vertebrae. (C)</p> Signup and view all the answers

Why is it important to check the ability to mask ventilate a patient after induction of general anesthesia?

<p>To ensure adequate oxygenation levels can be maintained during the induction process. (B)</p> Signup and view all the answers

What is the key difference between a Rapid Sequence Intubation (RSI) and a 'Modified' RSI?

<p>RSI does not include any mask ventilation between induction and intubation, 'Modified' RSI <em>may</em> include mask ventilation before paralytics. (B)</p> Signup and view all the answers

What is the correct position to place a patient in to optimize airway management?

<p>&quot;Sniffing&quot; position with head at level of the waist or higher. (A)</p> Signup and view all the answers

What is the role of eye protection during airway management?

<p>To prevent corneal abrasions. (B)</p> Signup and view all the answers

What is the primary purpose of a bougie during intubation?

<p>To serve as a guide for placing an ET tube when direct visualization is difficult. (A)</p> Signup and view all the answers

In what Cormack-Lehane grades is the use of a bougie typically indicated?

<p>Grades 2 and 3 (B)</p> Signup and view all the answers

What is the significance of the 'J' shape at the tip of a bougie?

<p>It aids in maneuvering around the epiglottis and through the vocal cords. (C)</p> Signup and view all the answers

What is the standard length of a bougie?

<p>60-70 cm (A)</p> Signup and view all the answers

Which of these is NOT a characteristic of video laryngoscopy?

<p>Direct alignment of axes is required. (C)</p> Signup and view all the answers

Which approach is recommended when using video laryngoscopy with a Glidescope?

<p>Approach from the side of the mouth with the stylet in view (D)</p> Signup and view all the answers

According to the information, the use of video assisted intubation improves Cormack-Lehane views from grades 3 and 4 to 1 and 2 what percentage of the time?

<p>77% (B)</p> Signup and view all the answers

What is a key benefit of using video laryngoscopy in patients who are difficult to intubate?

<p>It bypasses redundant retropharyngeal tissues to improve view. (D)</p> Signup and view all the answers

What is the recommended gauge size for an angiocath used in transtracheal jet ventilation?

<p>10-14 gauge (C)</p> Signup and view all the answers

Which of the following is a potential early complication of a cricothyrotomy?

<p>Hemorrhage (A)</p> Signup and view all the answers

What is the recommended size of ETT for a surgical cricothyrotomy?

<p>6.0 ETT (A)</p> Signup and view all the answers

What is the primary source of oxygen delivery in transtracheal jet ventilation?

<p>Venturi principle (A)</p> Signup and view all the answers

Which of the following is a component of a surgical cricothyrotomy?

<p>Making an incision through the midline of the skin (B)</p> Signup and view all the answers

What is the initial step in a percutaneous cricothyrotomy?

<p>Puncturing the cricothyroid membrane (D)</p> Signup and view all the answers

What is a potential late complication of cricothyrotomy?

<p>Tracheal stenosis (A)</p> Signup and view all the answers

What is a preferred method when performing a needle cricothyrotomy?

<p>Using a commercial cricothyrotomy needle kit (D)</p> Signup and view all the answers

What is a primary advantage of using Transtracheal Jet Ventilation (TTJV)?

<p>It is a quick and simple method for emergent oxygenation. (A)</p> Signup and view all the answers

What is a key limitation when using TTJV regarding ventilation?

<p>It cannot ventilate optimally. (D)</p> Signup and view all the answers

What is the recommended I:E ratio when using TTJV?

<p>1:3 or 1:4 (B)</p> Signup and view all the answers

Which of the following is a potential complication associated with TTJV?

<p>Esophageal puncture (B)</p> Signup and view all the answers

During TTJV, what should be continuously monitored and documented?

<p>Breath sounds and chest inflation (C)</p> Signup and view all the answers

During lightwand intubation, a well-defined glow at the sternal notch indicates passage through which structure?

<p>The mid-trachea (C)</p> Signup and view all the answers

What is the primary purpose of the ring at the proximal end of an Endotrol ET tube?

<p>To guide the distal tip anteriorly (B)</p> Signup and view all the answers

What does a B.A.A.M. whistle do?

<p>Produces a whistle near airflow (B)</p> Signup and view all the answers

Which of the following is the most common approach to a known difficult airway using a fiberoptic scope?

<p>Awake fiberoptic intubation (A)</p> Signup and view all the answers

Which of these medications is used as an antisialogogue to reduce secretions before fiberoptic intubation?

<p>Glycopyrrolate (A)</p> Signup and view all the answers

What is the function of Williams, Ovassapian and Berman airways during fiberoptic intubation?

<p>To protect the fiberoptic scope and retract the tongue (D)</p> Signup and view all the answers

When using a fiberoptic scope for intubation, how should the distal hand hold the scope?

<p>At the patient's mouth (B)</p> Signup and view all the answers

What action is often required in anesthetized patients during fiberoptic intubation to optimize conditions?

<p>Jaw thrust (C)</p> Signup and view all the answers

In the context of difficult airway management, when might a needle cricothyrotomy be necessary?

<p>When a patient is desaturating and all other airway adjuncts have been exhausted (C)</p> Signup and view all the answers

During advancement of a fiberoptic scope, what should be done if the visual field is lost?

<p>Pull the scope back until familiar structures appear (B)</p> Signup and view all the answers

What is the recommended range of pressure in Newtons for applying cricoid pressure?

<p>30-44 Newtons (A)</p> Signup and view all the answers

Which of the following is NOT a risk associated with applying cricoid pressure?

<p>Improved glottic visualization (D)</p> Signup and view all the answers

When should cricoid pressure be released during intubation?

<p>Upon successful confirmation of endotracheal tube placement. (B)</p> Signup and view all the answers

During mask ventilation, what is the purpose of the 'C' formed by the thumb and index finger?

<p>To provide a seal by holding the mask to the face. (D)</p> Signup and view all the answers

When using the 'EC' technique for mask ventilation, which fingers lift the mandible into the mask?

<p>Middle and fourth finger (C)</p> Signup and view all the answers

What is the primary function of an oral airway (OPA)?

<p>To lift the tongue from the posterior pharynx. (A)</p> Signup and view all the answers

How is the correct size of an oral airway (OPA) determined?

<p>By measuring the distance from the corner of the mouth to the angle of the mandible (C)</p> Signup and view all the answers

A nasal pharyngeal airway (NPA) is sized by measuring the distance from the nasal opening to which landmark?

<p>The tragus of the ear (C)</p> Signup and view all the answers

During direct laryngoscopy using a Mac blade, where should the blade be advanced?

<p>To the vallecula space, and lift the epiglottis. (A)</p> Signup and view all the answers

What does a Cormack-Lehane Grade III view indicate during direct laryngoscopy?

<p>The epiglottis is visible without a view of the glottic opening. (A)</p> Signup and view all the answers

During a BURP maneuver, in what direction should pressure be applied to the thyroid cartilage?

<p>Backward (posterior), upward (superior), and rightward (A)</p> Signup and view all the answers

Which of the following is NOT a step to verify the integrity of a reusable LMA before insertion?

<p>Application of lidocaine ointment to the dorsal surface. (A)</p> Signup and view all the answers

During an LMA insertion, what should be done if resistance is initially felt as the device is advanced?

<p>Withdraw the LMA and reinsert it. (C)</p> Signup and view all the answers

What does the acronym RODS stand for in reference to LMA placement?

<p>Restricted Mouth Opening, Obstruction, Distortion, Stiff Lungs (C)</p> Signup and view all the answers

What is a distinct advantage of the Fastrach LMA over the classic LMA?

<p>It can be removed with the endotracheal tube in place. (B)</p> Signup and view all the answers

Flashcards

Sniffing Position

The sniffing position helps align the pharyngeal, oral, and laryngeal axes, making intubation easier.

Pre-oxygenation

Pre-oxygenation washes out nitrogen from the lungs, increasing the time a patient can safely hold their breath before intubation.

Rapid Sequence Induction (RSI)

A rapid sequence induction (RSI) uses a specific sequence of medications to ensure a safe and rapid intubation in patients at high risk for aspiration.

Cricoid Pressure (Sellick Maneuver)

Cricoid pressure, also known as the Sellick maneuver, helps prevent regurgitation and aspiration during intubation by compressing the esophagus against the cervical vertebrae.

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Succinylcholine

Succinylcholine is a neuromuscular blocking agent used in RSI to rapidly paralyze the muscles during intubation.

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Propofol

Propofol is an anesthetic agent used in RSI for rapid induction of unconsciousness to facilitate intubation.

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Modified Rapid Sequence Induction (RSI)

Modified RSI allows for one or two breaths with a mask prior to administering the neuromuscular blocking agent to assess the airway.

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Stylet in ‘Hockey Stick’ Position

The “hockey stick” position helps guide the endotracheal tube into the trachea during intubation.

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What is a tracheal bougie?

A flexible, curved guide used to help place an endotracheal tube (ETT) into the trachea when direct visualization of the vocal cords is challenging.

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How does a tracheal bougie help with intubation?

The bougie's curved tip helps maneuver around the epiglottis and into the vocal cords, guiding the ETT.

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How does the bougie confirm correct ETT placement?

The angled tip allows the operator to feel the tracheal rings, confirming the ETT is in the right place.

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What is video laryngoscopy?

Video laryngoscopy provides an indirect view of the vocal cords, enhancing visualization.

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How does video laryngoscopy differ from direct laryngoscopy?

A midline approach similar to direct laryngoscopy, but using a video screen for visualization.

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What are the advantages of video laryngoscopy in difficult airways?

A study of multiple studies that showed video laryngoscopy often improved the view of the vocal cords in difficult airway scenarios.

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What is important to remember when using a video laryngoscope?

It's essential to use the video laryngoscope as intended, with the provided stylet, approaching from the side.

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What is the impact of the Glidescope on airway management?

The Glidescope's technology revolutionized our ability to handle difficult airways.

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Lightwand Intubation

A technique used to guide an endotracheal tube (ETT) into the trachea using a lighted stylet.

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Endotrol ET Tube

A specialized endotracheal tube with a ring at the proximal end that guides the distal tip.

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B.A.A.M Whistle

A small whistle attached to the ETT that produces a sound when near airflow.

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Fiberoptic Intubation

A technique using a flexible fiberoptic scope to visualize and guide the ETT into the trachea.

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Awake Fiberoptic Intubation (AFOI)

Approach to fiberoptic intubation performed while the patient is awake.

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Antisialogogue

A medication used to decrease saliva before intubation.

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Williams, Ovassapian, and Berman Airways

A device that retracts the tongue and protects the fiberoptic scope.

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Needle Cricothyrotomy

An emergency airway technique performed by inserting a catheter through the cricothyroid membrane.

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Tracheal Rings for Orientation

The ability to visualize the trachea's rings using a fiberoptic scope helps determine direction.

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Optimizing Fiberoptic Conditions

Optimizing fiberoptic intubation involves using suction to clear secretions and oxygen to improve visibility and anesthesia.

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Tracheal-Tracheal Jet Ventilation (TTJV)

A method of providing temporary ventilation in an emergency using a face mask and oxygen source.

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How long is TTJV effective?

TTJV is a temporary ventilation method, lasting approximately 20 minutes.

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What is the downside of TTJV?

TTJV relies on room air entrainment, meaning it mixes oxygen with room air, resulting in a lower concentration of oxygen in the patient's lungs.

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What does I:E ratio mean in TTJV?

Increasing the I:E ratio during TTJV allows for a longer exhalation time, helping the patient exhale effectively.

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What are potential risks of TTJV?

Complications of TTJV include barotrauma, subcutaneous emphysema, mediastinal emphysema, arterial perforation, and esophageal puncture.

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Cricothyrotomy

A medical procedure that creates an opening in the cricothyroid membrane to secure an airway, typically used in emergency situations when intubation is impossible or difficult.

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Transtracheal Jet Ventilation (TTJV)

A minimally invasive technique for emergent airway management that involves inserting a needle into the cricothyroid membrane and delivering oxygen via a jet ventilator.

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Surgical Cricothyrotomy

A surgical procedure performed on the cricothyroid membrane with a scalpel to create a larger opening and insert an endotracheal tube.

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Percutaneous Cricothyrotomy

A minimally invasive technique for establishing an airway that involves inserting a needle or angiocath into the cricothyroid membrane, followed by the placement of a wire and a dilator.

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Improper Tube Placement

A potential complication of cricothyrotomy that can occur due to improper technique or placement of the airway device, leading to difficulty breathing and potential for serious injury.

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Subcutaneous Emphysema

A potential complication of cricothyrotomy that can occur due to the insertion of the airway device, leading to air leakage into the surrounding tissues.

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Vocal Cord Injury

A potential complication of cricothyrotomy that can occur due to damage to the vocal cords during the procedure.

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Aspiration

A potential complication of cricothyrotomy that can occur due to inadequate oxygenation or obstruction of the airway, leading to a buildup of fluid in the lungs.

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BVM Pressure

The amount of pressure required to ventilate a patient using a bag-valve-mask (BVM). This pressure is crucial for effective ventilation.

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One-Handed Mask Ventilation (EC Technique)

A technique used to ventilate a patient using a BVM. It involves using one hand to hold the mask securely against the face and the other hand to lift the jaw, creating a clear airway.

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Difficult Mask Ventilation

A condition that makes it difficult to ventilate a patient using a BVM. This can be due to a poor mask seal, excessive gas leakage, or resistance to airflow.

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Oral Pharyngeal Airway (OPA)

A device used to prevent airway obstruction by lifting the tongue away from the back of the throat. It is often used to help with breathing during spontaneous ventilation.

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Nasal Pharyngeal Airway (NPA)

A device used to open the airway by lifting the tongue away from the back of the throat. It is often used to help with breathing during spontaneous ventilation. It is well tolerated in awake patients.

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Direct Laryngoscopy

A medical procedure that involves inserting a blade into the mouth to visualize the larynx and vocal cords. It is typically used for intubation.

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Cormack and Lehane Grading System

A system used to grade the view of the larynx during direct laryngoscopy. It helps to assess the difficulty of intubation.

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BURP Maneuver

A maneuver used during laryngoscopy to improve the view of the vocal cords by applying pressure to the thyroid cartilage.

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Laryngeal Mask Airway (LMA)

A supraglottic airway device that is inserted into the pharynx to create an airtight seal, allowing for ventilation and intubation.

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Reusable LMA Inspection

Refers to the condition of an LMA that has been used multiple times and needs to be checked for damage or wear before being used again.

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LMA Insertion

The process of inserting an LMA into the pharynx. It involves carefully sliding the device along the hard palate until it reaches the desired position.

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Fastrach (Intubating LMA)

A specific type of LMA that features a handle for single-handed insertion and can accommodate a larger endotracheal tube.

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Intubating Bougie (Eschmann Stylet)

A flexible, semi-rigid device used to guide an endotracheal tube into the trachea, particularly during difficult intubations.

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Difficult Intubation

A condition that makes it difficult to intubate a patient, such as a restricted mouth opening, airway obstruction, or distorted anatomy.

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Intubation

The process of inserting an endotracheal tube into the trachea, typically performed during direct laryngoscopy.

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Study Notes

Airway Management

  • Prepare equipment: Appropriately sized masks, oral and nasal airways, laryngoscope with extra handles and blades, adequate light source, extra ETT (endotracheal tube) often one size smaller with stylet, syringe (10ml), and suction.
  • Prepare patient: Position head at waist level or higher, "sniffing" position, ramped if needed, pre-oxygenate with 100% FiO2.
  • Pre-oxygenation: Washes out nitrogen (79% in room air), increases safety margin from 3-5 minutes to 10–12 minutes, creates 100% concentration of O2 in patient's FRC (functional residual capacity).
  • Protect patient: During induction, tape eyes shut and apply ointment to prevent corneal abrasions.
  • Mask ventilation and adjuncts: Assess ability to mask ventilate (+ETCO2). Use additional adjuncts (oral airways, nasopharyngeal airways, etc.) as needed.
  • Intubation: If intubating, give paralytic and ventilate with volatile, maintain anesthetic depth, when paralytic takes effect then intubate, if difficulty then try alternative methods/adjuncts, maintain mask ventilation between attempts. Alternative is supraglottic airway or continue mask airway management (+ETCO2).
  • Rapid Sequence Induction (RSI): RSI is used when patient is high-risk for aspiration, includes anesthesia induction with Propofol, neuromuscular blockade with Succinylcholine.
  • Laryngoscopy: Steps in performing include open mouth via "scissoring", placing blade along right side of mouth avoiding teeth, and advancing blade while sweeping tongue to the left, and if using Miller blade, advancing to epiglottis.
  • LMA (laryngeal mask airway): Hold LMA as if it were a pen, slide along hard palate to posterior pharynx, stop when resistance felt, and properly place against hypopharyngeal floor. Inflate the cuff to 60cm H2O.
  • Mask ventilation: Apply manual breath and listen for leak, 20 cmH20 with LMA classic, up to 30cmH20 with LMA Proseal, E&E states up to 40-45cmH2O. Observe for ETCO2 and breath sounds, if leak observe LMA may not be seated well or epiglottis may be downfolded.

Cricoid Pressure/Sellick Maneuver

  • Position cricoid cartilage against cervical vertebrae to prevent regurgitation and aspiration.
  • Require 6-10 lbs (30–44 Newtons) of pressure.
  • Do not release until successful intubation confirmed.

Mask Ventilation Equipment

  • Orifice: 22mm ID
  • Body: transparent for observation of exhaled mist.
  • Rim/Cushion: can inflate or deflate for a good fit (with 10cc syringe).
  • Multiple sizes for variability.

Mask Ventilation Technique

  • One-handed technique (left hand): creating "C" shape with thumb and index finger to prevent leaks and apply slight downward pressure on mask.
  • Ensure care is taken to prevent compressing soft tissue (can cause obstruction). Middle and fourth fingers are placed under mandible. Utilize 5th finger to lift jaw to open airway.

Cricoid Pressure: Risks

  • Possible vomiting,
  • airway obstruction,
  • Difficult glottic visualization
  • Decreased upper/lower esophageal sphincter tone.

Difficult Mask Ventilation Criteria

  • Inability to provide adequate ventilation due to: insufficient mask seal, excessive gas leak, or excessive resistance to gas ingress/egress.

Cormack and Lehane Grading System

  • Grade I: full view of glottic opening
  • Grade II: posterior glottic opening, no anterior commissure.
  • Grade III: epiglottis visible but no glottic opening
  • Grade IV: epiglottis not visible, view of soft palate only.

Optimizing Laryngoscopy View

  • Sniffing position and "ramping" can improve view.
  • BURP maneuver (hand on thyroid cartilage, external backward and superior pressure, with right hand) for improved vocal cords view

Supraglottic Airway Devices

  • Inspect Visual/Discoloration/Broken/Cracks/Cuff Herniation/Misshaped Tip.
  • Perform Kink test.
  • Deflate/Inflate for Leak Testing.
  • Lubricate dorsal surface just prior to use.
  • Open mouth.

Patients who shouldn't get an LMA

  • Restricted mouth opening.
  • Obstruction in airway.
  • Distortion of anatomy.
  • Stiff lungs (asthma, COPD, morbidly obese).
  • High pressures needed for ventilation.

Fastrach (Intubating LMA)

  • Improved features over classic LMA: single-handed handle, accepts larger ETT, reinforced tube, epiglottic elevating bar, increased success rate.
  • Three sizes (3, 4, 5), all accommodate #8.0 ETT.

Intubating Bougie or Eschmann Stylet

  • Flexible, semi-rigid device for difficult intubations.
  • Acts as a guide when direct visualization of cords is challenging.
  • "J" shape at the tip aids in maneuvering around epiglottis, aids in visualization
  • Allows for feeling tracheal rings (clicking).
  • "J" Shape: Manuevering around the Epiglottis and through the cords

Video Laryngoscopy

  • Improved view of vocal cords (indirect view).
  • Sharp angle around structures.
  • Midline approach

Fiberoptic Intubation

  • Indicated for early difficulty or during intubation attempt, patient might be awake.
  • Principles: Antisialogogue (decreases secretions like glycopyrrolate), topicalization (application to surface), vasoconstriction (narrowing of blood vessels).
  • Use Fog free solution on tip of fiberoptic scope.
  • Use FO airways (Williams, Ovassapian, and Berman airways).
  • Protect FO scope (basically an OPA that has a hole to pass the scope).
  • Patient positioning in right side, facing, and sitting.
  • Keep the scope straight.

Infraglottic Airway Access

  • Emergency Techniques when intubation or ventilation is not possible: Needle Cricothyroidotomy, Percutaneous Cricothyrotomy and Surgical Cricothyrotomy.

Transtracheal Jet Ventilation (TTJV)

  • Temporary oxygenation method by passing a catheter (10-14 gauge).
  • Use when complete obstruction makes using mask or other airway methods impossible.
  • Use needle kit.
  • Requires appropriate equipment (oxygen source & appropriate tubing with connectors)
  • Provides high-pressure.
  • Monitor Peak Inspiratory Pressure.
  • Monitor compliance

Lightwand & Light-guided Intubation

  • Blind placement of lighted stylet for transillumination into the neck.
  • Insertion techniques for stylet and ETT.
  • Use light glow as guide, using rocking motion.

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