Anatomical Differences in Children

• Proportionally larger head: Flexes neck when supine
• Larger tongue: Relative to oral cavity size
• Higher larynx: C3-C4 vs C6 in adults
• Smaller airways: Proportionally narrower at all levels
• Cricothyroid membrane: Very small in children <10-12 years
• Narrowest point: Cricoid ring (vs vocal cords in adults)

Emergency Airway Access

Cricothyroidotomy

• Adult procedure: Standard emergency surgical airway
• Pediatric limitation: Small cricothyroid membrane <10-12 years
• Anatomy: Distance between thyroid and cricoid cartilages
• Risk: High complication rate in young children

Tracheostomy in Pediatrics

• Preferred method: For children <10-12 years
• Advantages:
  • Larger surgical target
  • More familiar anatomy
  • Lower complication risk
  • Better long-term management
• Technique: Surgical exposure below cricoid cartilage
• Location: Between 2nd-4th tracheal rings

Age-Specific Recommendations

• <2 years: Tracheostomy only
• 2-8 years: Tracheostomy strongly preferred
• 8-12 years: Tracheostomy preferred, cricothyroidotomy possible
• >12 years: Either procedure acceptable, cricothyroidotomy faster

Pediatric Airway Equipment

• Bag-mask ventilation: Most important skill
• Laryngeal mask airway: Good bridge device
• Endotracheal tubes: Uncuffed <8 years traditionally
• Emergency kit: Age-appropriate sizes readily available

Catgut Sutures

• Composition: Processed animal intestine (usually sheep)
• Degradation mechanism: Enzymatic degradation by tissue enzymes
• Types:
  • Plain catgut: Resorbs in 7-10 days
  • Chromic catgut: Cross-linked with chromium, resorbs in 2-3 weeks
• Advantages: Natural, good handling
• Disadvantages: Variable absorption, inflammatory response, potential allergic reactions

Vicryl (Polyglactin 910)

• Composition: Synthetic copolymer of glycolic and lactic acid
• Degradation mechanism: Hydrolysis (broken down by water)
• Absorption time: 2-3 weeks (loses tensile strength in 2-3 weeks, completely absorbed in 60-90 days)
• Variants:
  • Vicryl: Standard braided suture
  • Vicryl Rapide: Faster absorption (7-10 days)
  • Vicryl Plus: Contains triclosan for antibacterial properties
• Advantages: Predictable absorption, minimal tissue reaction, good knot security
• Clinical uses: Soft tissue closure, periodontal surgery, buried sutures

Polydiaxone (PDS-II)

• Composition: Synthetic polymer (polydioxanone)
• Structure: Monofilament
• Degradation mechanism: Hydrolysis
• Absorption time: ~6 months with minimal tissue reaction
• Tensile strength: Retains 70% at 2 weeks, 50% at 4 weeks
• Advantages:
  • Longest absorption time among synthetic absorbables
  • Excellent biocompatibility
  • Minimal inflammatory response
  • Good for wounds requiring extended support
• Clinical uses: Deep tissue layers, slow-healing wounds, pediatric surgery

Other Synthetic Absorbable Sutures

Monocryl (Poliglecaprone 25)

• Absorption: 3-4 months
• Advantages: Low tissue reaction, good cosmetic results
• Uses: Subcuticular closure, soft tissue approximation

Biosyn (Glycomer 631)

• Absorption: 3-4 months
• Advantages: Braided with monofilament properties
• Uses: General soft tissue approximation

Common Causes in Oral Surgery

• Tongue displacement: Loss of muscle tone, posterior collapse
• Blood/debris: From surgical procedures
• Edema: Post-operative swelling, allergic reactions
• Foreign bodies: Gauze, tooth fragments, instruments
• Laryngospasm: Reflex closure of vocal cords
• Bronchospasm: Lower airway constriction

Signs of Airway Compromise

Early Signs

• Stridor: Inspiratory (upper airway), expiratory (lower airway)
• Increased respiratory effort: Accessory muscle use
• Anxiety/agitation: Hypoxemia, hypercarbia
• Voice changes: Hoarseness, muffled speech
• Cyanosis: Central (lips, tongue) vs peripheral

Late Signs (Impending Respiratory Arrest)

• Bradycardia: From severe hypoxemia
• Hypotension: Cardiovascular compromise
• Altered consciousness: Confusion, somnolence
• Paradoxical breathing: Chest-abdomen dyscoordination
• Silent chest: Absent air movement despite effort

Surgical Considerations for the Submandibular and Parotid Glands

When performing surgery on the submandibular and parotid glands, it is crucial to be aware of the anatomical structures and nerves at risk to minimize complications. Below is an overview of the key nerves and anatomical landmarks relevant to these surgical procedures.

Major Nerves at Risk During Submandibular Gland Surgery

1. Hypoglossal Nerve (CN XII):

   • This nerve is responsible for motor innervation to the muscles of the tongue. It lies deep to the submandibular gland and is at risk during surgical manipulation in this area.

2. Marginal Mandibular Nerve:

   • A branch of the facial nerve (CN VII), the marginal mandibular nerve innervates the muscles of the lower lip and chin. It runs just deep to the superficial layer of the deep cervical fascia, below the platysma muscle, making it vulnerable during submandibular gland surgery.

3. Lingual Nerve:

   • The lingual nerve provides sensory innervation to the anterior two-thirds of the tongue and carries parasympathetic fibers to the submandibular gland via the submandibular ganglion. It is located in close proximity to the submandibular gland and is at risk during dissection.

Anatomical Considerations for Parotid Gland Surgery

• Parotid Fascia:

  • The parotid gland is encased in a capsule of parotid fascia, which provides a protective layer during surgical procedures.

• Facial Nerve (CN VII):

  • The facial nerve is a critical structure to identify during parotid gland surgery to prevent injury. Key landmarks for locating the facial nerve include:
    • Tympanomastoid Suture Line: This is a reliable landmark for identifying the main trunk of the facial nerve, which lies just deep and medial to this suture.
    • Tragal Pointer: The nerve is located about 1 cm deep and inferior to the tragal pointer, although this landmark is less reliable.
    • Posterior Belly of the Digastric Muscle: This muscle provides a reference for the approximate depth of the facial nerve.
    • Peripheral Buccal Branches: While following these branches can help identify the nerve, this should not be the standard approach due to the risk of injury.

Submandibular Gland Anatomy

• Location:

  • The submandibular gland is situated in the submandibular triangle of the neck, which is bordered by the mandible and the digastric muscles.

• Mylohyoid Muscle:

  • The gland wraps around the mylohyoid muscle, which is typically retracted anteriorly during surgery to provide better exposure of the gland.

• CN XII:

  • The hypoglossal nerve lies deep to the submandibular gland, making it important to identify and protect during surgical procedures.

• Abbe flap: Used for lip reconstruction.
• Protein requirement (critically ill): 1.5 – 2 g/day.
• Alkali burns: Cause more tissue damage than acid burns.
• Fluid resuscitation (hypernatremia): Prefer 5% dextrose in water (D5W) over Ringer’s lactate.
• Torque testing: Checks osseointegration during implant uncovering.

Postoperative Airway Obstruction

Causes

• Hematoma: Expanding neck hematoma
• Edema: Laryngeal or facial swelling
• Vocal cord paralysis: Recurrent laryngeal nerve injury
• Foreign body: Gauze, blood clots

Management

• Assessment: Rapid evaluation of obstruction level
• Position: Sitting up if conscious, stable
• Suction: Remove blood/debris if visible
• Medications: Steroids for edema, epinephrine for anaphylaxis
• Definitive: Secure airway if conservative measures fail

Anaphylaxis

Recognition

• Rapid onset: Minutes after exposure
• Skin: Urticaria, angioedema
• Respiratory: Bronchospasm, laryngeal edema
• Cardiovascular: Hypotension, tachycardia

Treatment

• Epinephrine: 0.3-0.5mg IM (1:1000)
• Airway: May need emergency surgical airway
• Fluids: Aggressive IV resuscitation
• Antihistamines: H1 and H2 blockers
• Steroids: Prevent biphasic reaction

Laryngospasm

Triggers

• Stimulation: Light anesthesia, secretions
• Irritants: Blood, gastric contents
• Medications: Propofol, succinylcholine

Treatment

• Positive pressure: Gentle bag-mask ventilation
• Larson's maneuver: Pressure at laryngospasm notch
• Succinylcholine: 0.25-0.5 mg/kg if severe
• Intubation: May be necessary if persistent