Current Techniques of Adenoidectomy


Introduction

The clinical significance of adenoid hypertrophy was not truly appreciated until the mid-19th century. This was due to the adenoids' relatively inaccessible location given the technology available at that time. Once discovered, various techniques for the removal of the adenoids were developed. Some of these basic techniques have remained with us since that time.

Although commonly known for causing chronic sinonasal symptoms or influencing chronic ear disease, enlargement of the adenoids can play a prominent role in obstructive sleep apnea.

Patient Selection

Children with signs and symptoms of obstructive sleep apnea or those with polysomnogram-proven disease should have their adenoids evaluated as part of a routine workup. This can be done in a number of ways. In very young children or older cooperative children, flexible fiber-optic nasopharyngoscopy provides the most direct means of evaluation. A camera and monitor attached to the scope can provide families with visual reinforcement. In the child who will not tolerate a flexible examination in the office, a lateral plain film of the nasopharynx can demonstrate adenoid hypertrophy and resultant compromise of the nasal air column. Although not routinely obtained to evaluate for adenoid hypertrophy, computed tomography scans and magnetic resonance imaging can also demonstrate enlargement of the adenoid pad.

Adenoid hypertrophy is classically graded on a scale of 1 to 4+, with each grade describing the percentage of the adenoid hypertrophy obstructing the nasopharynx on nasal endoscopy. Grade 1 describes the adenoid occupying less than 25% of the choanal area. Grade 2 adenoids occupy 25% to 50% of the choanal area. Grade 3 adenoids occupy 50% to 75% of the choanal area. Grade 4 adenoids occupy 75% to 100% of the choanal area. Having the patient sniff versus phonate can best show the nasopharyngeal opening based on the position of the soft palate, which is maximally open with a sniff and closed while phonating.

Adenoidectomy must be carefully considered in children with a history of cleft palate, overt or submucous, or those with a history of velopharyngeal insufficiency. A balance between relief of obstruction and the creation of velar incompetence is crucial. Families must be counseled as to the increased risk for this potentially significant complication, even if a limited procedure is performed, such as a superior adenoidectomy.

Very commonly, adenoidectomy is performed in concert with tonsillectomy as the most common surgical procedure to treat obstructive sleep apnea.

Outline of Procedures

Various options for airway management exist, and it is important for the surgical and anesthesia teams to decide on this before the procedure begins. A straight endotracheal tube, laryngeal mask airway, or oral Ring–Adair–Elwyn tube may be used. The surgeon must consider factors such as other procedures (i.e. tonsillectomy) being performed when deciding on the type of airway management.

Historically, adenoidectomy was performed with the surgeon facing the patient, who was sitting upright. Some surgeons still currently employ an orientation similar to that of endoscopic sinus surgery. Today, the Rose position is commonly used in which the patient's head and neck are extended and the surgeon sits behind the patient. A small shoulder roll may aid in this positioning. The eyes are protected, and the patient is sterilely draped. A mouth gag, such as the Crowe–Davis or McGyver, is then carefully inserted into the mouth, and the oropharynx is exposed. The mouth gag can be suspended per surgeon preference. The soft palate should then be visually inspected and palpated before mouth gag extension to ensure that a submucous cleft is not present. Visualization of the nasopharynx can be easily achieved using a defogged #5 laryngeal mirror and a headlight. Exposure can be enhanced using either one or two red rubber catheters. These are placed transnasally, retrieved from the oropharynx, and then clamped back on themselves, effectively retracting the soft palate. This retraction with red rubber catheters may aid in protecting the posterior surface of the soft palate from scarring, and hence nasopharyngeal stenosis, as well as aid in visualization of the nasopharynx.

The adenoidectomy is performed to the lateral boundary of the nasopharynx at the torus tubarius of the eustachian tube orifice. Care should be taken to avoid the eustachian tube orifice to avoid scaring and future eustachian tube dysfunction. The anterior border is defined by the posterior septum, or vomer, and the bony choana. Avoiding injury to the lateral bony choana can avoid unnecessary bleeding from branches of the sphenopalatine artery. The posterior/inferior border is defined by Passavant ridge, where the soft palate approximates for closure of the nasopharynx. Leaving a modest cuff of adenoid centrally along the inferiormost portion of the adenoid bed can protect from concerns of postoperative velopharyngeal insufficiency. Due to the curved nature of the roof of the nasopharynx, the depth of adenoidectomy can be a challenge to define. Deep to the adenoids are prevertebral muscles, which on deep cautery can lead to scarring, fibrosis, abscess, and even Grisel syndrome, defined by neck pain, stiffness, and atlantoaxial subluxation.

You're Reading a Preview

Become a Clinical Tree membership for Full access and enjoy Unlimited articles

Become membership

If you are a member. Log in here