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KEY CONCEPTS

KEY CONCEPTS

  • image The anesthetic goals for laryngeal endoscopy include an immobile surgical field and adequate masseter muscle relaxation for the introduction of the suspension laryngoscope (typically profound muscle paralysis will be sought), adequate oxygenation and ventilation, and cardiovascular stability despite periods of rapidly varying procedural stimulation.

  • image During jet ventilation, chest wall motion must be monitored and sufficient exhalation time allowed to avoid air trapping and barotrauma.

  • image The greatest concern of laser airway surgery is an airway fire. This risk can be moderated by minimizing the fraction of inspired oxygen (FiO2 <30% if tolerated by the patient) and can be eliminated when there is no combustible material (eg, flammable endotracheal tube, catheter, or dry cotton pledget) in the airway.

  • image Techniques to minimize intraoperative blood loss include topical vasoconstriction with cocaine or an epinephrine-containing local anesthetic for vasoconstriction, maintaining a slightly head-up position, and providing a mild degree of controlled hypotension.

  • image If there is serious preoperative concern regarding potential airway problems, intravenous induction may be avoided in favor of awake direct or fiberoptic laryngoscopy (cooperative patient) or direct or fiberoptic intubation following an inhalational induction, maintaining spontaneous ventilation (uncooperative patient). In any case, the appropriate equipment and qualified personnel required for emergency tracheostomy must be immediately available.

  • image The surgeon may request the omission of neuromuscular blockade during neck dissection, thyroidectomy, or parotidectomy to allow nerve identification (eg, spinal accessory, facial nerves) by direct nerve stimulation and thereby facilitate their preservation.

  • image Manipulation of the carotid sinus and stellate ganglion during radical neck dissection has been associated with wide swings in blood pressure, bradycardia, arrhythmias, sinus arrest, and prolonged QT intervals. Infiltration of the carotid sheath with local anesthetic will usually moderate these problems. Bilateral neck dissection may result in postoperative hypertension and loss of hypoxic drive due to denervation of the carotid sinuses and bodies.

  • image Patients undergoing maxillofacial reconstruction or orthognathic surgical procedures often pose airway challenges. If there are any anticipated signs of problems with mask ventilation or tracheal intubation, the airway should be secured prior to induction of general anesthesia.

  • image If there is a risk of postoperative edema involving structures that could obstruct the airway (eg, tongue, pharynx), the patient should be closely observed and perhaps kept intubated.

  • image Nitrous oxide is either entirely avoided during tympanoplasty or discontinued prior to graft placement.

Cooperation and communication between surgeon and anesthesia provider are critical for all surgery within or near the airway. Establishing, maintaining, and protecting the airway in the face of abnormal anatomy during a procedural intervention are demanding tasks. An understanding of airway anatomy (see Chapter 19) and an appreciation of common otorhinolaryngologic and maxillofacial procedures are invaluable in handling these anesthetic challenges successfully.

ENDOSCOPY

Endoscopy includes diagnostic and operative laryngoscopy and microlaryngoscopy (laryngoscopy aided by an operating microscope), esophagoscopy, and bronchoscopy (discussed in Chapter 25). Endoscopic procedures may be accompanied by laser surgery.

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