Final Exam Deck Flashcards
Mention the three paired Larynx cartilages
- Arytenoid
- Corniculate
- Cuneiform
Mention the three unpaired cartilages of the Larynx
- Epiglottis
- Thyroid
- Cricoid
Which nerve supplies Sensory innervation to the Larynx?
- SLN (internal branch-Vagus)
- RLN
- Glossopharyngeal
Which nerve supplies Motor innervation to the Larynx?
- RLN
- SLN (external branch)
Which structures of the Larynx are innervated by the SLN-internal branch (Vagus)?
- Laryngeal mucosa above the vocal cords
- Inferior to the epiglottis
Which structures of the Larynx are innervated by the RLN?
- Laryngeal mucosa below vocal cords
Which structures of the Larynx are innervated by the Glossopharyngeal nerve?
- Superior aspect of epiglottis
- Base of the tongue
Which muscle group of the Larynx are innervated by the RLN-Motor?
- ALL intrinsic muscles
- Except Cricothyroid muscle
Which muscle of the Larynx is innervated by the SLN-external branch Motor?
Cricothyroid muscle
Identify the structures of the image below.
What are the muscle groups of the Larynx?
- Intrinsic Muscles
- Extrinsic muscles
What is the function of the Cricothyroid muscle of the Larynx?
- Tension vocal cords
- Elongates vocal cords
What is the function of the Thyoarytenoid and Vocalis muscle of the Larynx?
- Relax the vocal cord
What is the function of the Posterior Cricoarytenoid muscle of the Larynx?
- ABduts vocal cords
What is the function of the Lateral Cricothyroid and Transverse Arytenoid muscle of the Larynx?
- ADducts vocal cords
What is the function of the Aryepiglottic muscle of the Larynx?
- Closes glottis
Identify the function of each of the Intrinsic muscles of the larynx in the image below.
Mention the Extrinsic Muscles of the Larynx.
- Sternohyoid
- Sternothyroid
- Thyrohyiod
- Thyroepiglottic
- Stylopharyngeus
- Inferior pharyngeal constrictor
Which Extrinsic muscles of the larynx are innervated by the Cervical plexus and C1, C2, and C3?
- Sternohyoid (draws hyoid bone inferiorly)
- Sternothyroid ( draws thyroid cartilage caudad)
Which Extrinsic muscles of the larynx are innervated by the Cervical plexus, Hypoglossal nerve, and C1, C2?
Thyrohyoid muscle
Pulls Hyoid Bone Inferiorly
What’s the function of the Thyrohyoid muscle?
- Pulls hyoid bone inferiorly
What’s the function of the Thyroepiglottic muscle?
- Inversion of aryepiglottic fold
What’s the function of the Stylopharyngeous muscle?
- Folds thyroid cartilage
What’s the function of the Inferior pharyngeal constrictor muscle of the larynx?
Aids swallowing
Which Extrinsic muscle of the larynx is innervated by the Glossopharyngeal nerve?
Stylopharyngeus muscle
The Thyroepiglottic muscle is innervated by:
The Recurrent Laryngeal Nerve (RLN)
Only extrinsic muscle innervated by the RLN
Fx: Inversion of Aryepiglottic fold
The Thyrohyoid is innervated by:
- Cervical plexus
- Hypoglossal nerve
- C1 and C2
Which topical anesthetic has the vasoconstrictive ability and blocks the reuptake of NE and EPI at adrenergic nerve endings?
- Cocaine 4% Sln
- Dose 3 mg/kg
What are the doses of Lidocaine as a topical anesthetic?
- 4 mg/kg plain
- 7 mg/kg with EPI 200-300mg
What are some notable features of Lidocaine?
- Rapid onset
- Suitable for all areas of the tracheobronchial tree
What are some notable features of Benzocaine?
- Short duration of action (10min)
- Produce methemoglobinemia
What is the dose of Bupivacaine and what are some notable features?
- Dose 2.5 mg/kg plain
- Slow hepatic clearance
- Long duration of action
What are the dose and notable features of Mepivacaine?
- 4 mg/kg
- Intermediate potency
- Rapid onset
What are the dose and notable features of Dyclonine?
- 300 mg maximum
- Topical spray or gargle
- Frequent use for laryngoscopy
- Absorbed through skin and mucous membranes
What are some Ester Local anesthetics drugs for ENT procedures?
- Procaine
- Chloroprocaine
- Tetracaine
- Cocaine
- Benzocaine
What are some Amide Local anesthetics drugs for ENT procedures?
- Lidocaine
- Mepivacaine
- Prilocaine
- Bupivacaine
- Ropivacaine
- Articaine
What are the characteristics of Anticholinergic drugs used during ENT procedures?
- Produce antisialogogue effects
- Useful in certain intraoral procedures requiring a dryer field.
Which Anticholinergic drug, Glycopyrrolate or Atropine, is better during ENT procedures?
- Glycopyrrolate
- Produces less tachycardia
- Does not cross the BBB
- Lacks sedative effects
What are the common agents used for Hypotensive techniques?
- Sodium nitroprusside
- Dexmedetomidine
- Esmolol
- Nitroglycerine
- Nicardipine
- Remifentanil with Propofol
- Propofol
What are the does, advantages, and disadvantages of Sodium Nitroprusside for Hypotensive techniques?
- Young adults 1-5 mcg/kg/min
- Children 6-8 mcg/kg/min
Advantages:
- Potent
- Reliable
- Rapid onset and recovery
- CO well-preserved
Disadvantages:
- Reflex tachycardia
- Rebound HTN
- Pulmonary shunting
- Cyanide toxicity
What are the doses, advantages, and disadvantages of Dexmedetomidine for Hypotensive techniques?
- 1 mcg/kg/ over 10 min
- Then 0.2-0.7 mcg/kg/min
Advantages:
- Dose-dependent sedation and analgesia.
- Hypotension
- Decreases IV and inhaled anesthetic requirements
- Smooth emergence
Disadvantages:
- Bradycardia
- Hypotension
- Heart block
What needs to be determined before the controlled hypotension technique?
- A safe MAP
- MAP not < 50-60 mmHg
- No more > a 20% decrease in baseline MAP
What must be monitored regardless of the chosen technique during permissive hypotension?
- UOP
- MAP
- CPP
- Cardiac perfusion pressure
- ABG’s
What are the two most common lasers used during an ENT procedure?
- CO2 ( 10,600nm)
- Nd: YAG (1064nm)
What are the characteristics of the CO2 laser?
- Produces beam with long wavelengths
- Absorb almost entirely the tissue-vaporizing cell water
- Burn the cornea
What are the characteristics of the Nd: YAG laser?
- A shorter beam passes through the garnet
- shorter wavelength less absorption by water and tissue
- beam light passes through the cornea
What are the appropriate color eye-protection glasses for the Nd: YAG laser?
- Green-lensed protection
What are the appropriate color protection glasses for the CO2 laser?
- Any clear glass or plastic that surrounds the face.
What are the appropriate color protection glasses for the Potassium titanyl-phosphate (KTP) laser?
Orange-red
What are the appropriate color eye-protection glasses for the Argon laser?
Orange glasses
What is the general safety protocol for Surgical lasers?
Thyroid Gland?
- Butterfly-shaped
- Composed of two lobes
The two lobes of the Thyroid gland are connected by a tissue mass named:
Thyroid Isthmus
Where is the Thyroid located?
- Anterior and Anterolateral aspect of the trachea
- inferior to the larynx
What is the largest endocrine gland in the body?
- Thyroid gland
- weights 20g in healthy adults
What is the blood supply of the thyroid gland?
Superior and inferior thyroid arteries.
branches of common carotid artery
Which nerve is associated with the motor function of the larynx that abducts, adducts, and tenses the vocal cords?
- RLN
- SLN- external branch
What is the primary PreOp goal for Thyroid surgery?
- Ensure Pt is Euthyroid
- Assess the degree of organ complication
- Determine the extent of airway involvement
Which medication regimen should be continued until the morning of surgery for a patient undergoing a thyroid procedure?
- Antithyroid medications
- Beta-blockers
Which lab values are increased or decreased in a patient with Hypothyroidism?
- T3 and T4 increased
- TSH decrease or normal
What are the oral drugs used to treat Hyperthyroidism?
- Methimazole (Tapazole)
- Propylthiouracil (TPU)
- Iodine
- SSKI
- Lugol solution
- Propranolol (Inderal)
- Atenolol (Tenormin)
- Metoprolol
Which is the drug of choice to treat Hyperthyroidism?
- Methimazole (Topazole)
- Easy dosing
- Better side effect
- 10-40mg start QD
- 5-15mg maintenance
How long in advance is Iodide added to a patient undergoing thyroid surgery?
- 1 week prior to surgery
- Continue through the day of surgery.
Which drug is used in emergency thyroid surgery for adrenergic suppression?
- Beta Blockers without intrinsic sympathomimetic activity
What is the adjunct Gold standard of visual nerve identification during thyroid and parathyroid surgery?
Intraoperative nueral monitoring (IONM)
Which monitors are used to assess RLN and Vocal cord function during thyroidectomy?
- A special ETT, Medtronic nerve integrity monitor (NIM)
- EMG endotracheal tube (NIM 3.0 ETT)
What’s the anesthesia technique of choice for thyroidectomy?
- General endotracheal anesthesia
- Standard induction and maintenance drugs are used.
What is the NMBD of choice for paralysis during thyroidectomy?
Succinylcholine because of short duration and spontaneous degradation.
The PreOp airway assessment for a patient undergoing thyroidectomy involves:
- Full visualization and palpation of the neck for thyroid goiter.
- Airway should be assessed in the supine position.
A patient with Hyperthyroidism is at higher incidence for:
- Myasthenia gravis
- Skeletal muscle weakness
- Increased sensitivity to muscle relaxants
What are the three types of Le Fort fractures?
- Le Fort I fracture
- Le Fort II fracture
- Le Fort III fracture
Le Fort I Fracture characteristics
- Horizontal fracture of the maxilla
- Extend from the floor of the nose and hard palate
- Nasal septum to pterygoid plates posteriorly