Describe Laryngoscopy & Equipment in detail.

Laryngoscopy

Laryngoscopy is the visualisation of the larynx to enable intubation. The traditional direct laryngoscope (e.g. The curved Macintosh blade, whose tip sits in the vallecula, or the straight Miller blade, which lifts the epiglottis) provides a direct line of sight to the glottis. Videolaryngoscopes use a camera at the blade tip to give an indirect view — improving the view in many difficult airways.

Cormack–Lehane grades of the laryngoscopic view: grade 1 (full glottis) to grade 4 (neither glottis nor epiglottis) — higher grades indicate a more difficult intubation.

Grading the View (cormack–lehane)

The laryngoscopic view is graded by the Cormack–Lehane classification: Grade 1 — most of the glottis visible; Grade 2 — only the posterior glottis/arytenoids; Grade 3 — only the epiglottis; Grade 4 — neither glottis nor epiglottis. Grades 3–4 indicate a difficult intubation.

Equipment

The intubation set includes: laryngoscopes (with a range of blades) and a videolaryngoscope; a range of tracheal tubes (with a checked cuff); a bougie/stylet to aid tube placement (especially with a poor view); a syringe to inflate the cuff; suction; a capnograph and monitoring; and supraglottic airways and front-of-neck equipment for rescue. All equipment is checked before induction.

Videolaryngoscopy

The widespread adoption of videolaryngoscopes has changed difficult-airway practice. By placing a camera at the blade tip, they provide a view ‘around the corner’ that does not require the oral, pharyngeal and laryngeal axes to be aligned, so they frequently convert a poor direct view (Cormack–Lehane grade 3–4) into a good indirect one and improve first-pass success in many difficult airways. They are increasingly used as a first-line device and are a key tool in the difficult-airway algorithm, though a good view on the screen does not always make tube delivery easy, and skill with a bougie or stylet remains necessary.

• Direct laryngoscopy: Macintosh (curved, vallecula) & Miller (straight, lifts epiglottis) blades; videolaryngoscopy for indirect view.
• Cormack–Lehane grade 1 (full glottis) → 4 (neither); grades 3–4 = difficult.
• Equipment: laryngoscopes, tubes + checked cuff, bougie/stylet, suction, capnograph, rescue devices.
• Bougie rescues a grade-3 view (feel tracheal clicks, railroad the tube).
• Check all airway equipment (incl. Difficult-airway kit) before induction.