Tonsillectomy is a surgical procedure in which both palatine tonsils (hereafter called "tonsils") are removed from a recess in the side of the pharynx called the tonsillar fossa. The procedure is performed in response to repeated occurrence of acute tonsillitis, sleep surgery for obstructive sleep apnea, nasal airway obstruction, diphtheria carrier state, snoring, or peritonsillar abscess. For children, tonsillectomy is usually combined with an adenoidectomy, which is the removal of the adenoid (also known as the "pharyngeal tonsil" or "nasopharyngeal tonsil"). The combination of these two procedures is called an "adenotonsillectomy" or "T&A". Adenoidectomy is uncommon in adults in whom the adenoid is much smaller than in children and rarely causes problems. Although tonsillectomy is nowadays performed much less frequently than in the 1950s through 1970s, it remains a common surgical procedure in children in the United States and many other western countries. However, tonsillectomy is still a controversial surgery as its benefits seem to be only modest and temporary in most cases, there are recognised hazards associated with the operation and there are several indications that tonsillectomy may compromise the immune system in the long run, especially when performed at a young age.
Video Tonsillectomy
History
Tonsillectomies have been practiced for over 2,000 years, with varying popularity over the centuries. The procedure is claimed in some books as "Hindu medicine" about 1000 BCE (non-evidence based literature). Others refer to it as cleaning of tonsil using the nail of the index finger. Roughly a millennium later the Roman aristocrat Aulus Cornelius Celsus (25 BCE - 50 CE) described a procedure whereby using the finger (or a blunt hook if necessary), the tonsil was separated from the neighboring tissue before being cut out. Galen (121-200 CE) was the first to advocate the use of the surgical instrument known as the snare, a practice that was to become common until Aetius (490 CE) recommended partial removal of the tonsil, writing "Those who extirpate the entire tonsil remove, at the same time, structures that are perfectly healthy, and, in this way, give rise to serious Hæmorrhage". In the 7th century Paulus Aegineta (625-690) described a detailed procedure for tonsillectomy, including dealing with the inevitable post-operative bleeding. 1,200 years pass before the procedure is described again with such precision and detail.
The Middle Ages saw tonsillectomy fall into disfavor; Ambroise Pare (1509) wrote it to be "a bad operation" and suggested a procedure that involved gradual strangulation with a ligature. This method was not popular with the patients due to the immense pain it caused and the infection that usually followed. Scottish physician Peter Lowe in 1600 summarized the three methods in use at the time, including the snare, the ligature, and the excision. At the time, the function of the tonsils was thought to be absorption of secretions from the nose; it was assumed that removal of large amounts of tonsillar tissue would interfere with the ability to remove these secretions, causing them to accumulate in the larynx, resulting in hoarseness. For this reason, physicians like Dionis (1672) and Lorenz Heister censured the procedure.
In 1828, physician Philip Syng Physick modified an existing instrument originally designed by Benjamin Bell for removing the uvula; the instrument, known as the tonsil guillotine (and later as a tonsillotome), became the standard instrument for tonsil removal for over 80 years. By 1897, it became more common to perform complete rather than partial removal of the tonsil after American physician Ballenger noted that partial removal failed to completely alleviate symptoms in a majority of cases. His results using a technique involving removal of the tonsil with a scalpel and forceps were much better than partial removal; tonsillectomy using the guillotine eventually fell out of favor in America.
Maps Tonsillectomy
Medical uses
Tonsillectomy may be indicated when the patient experiences recurrent infections of acute tonsillitis. As the size of tonsils reaches its maximum at 3 years of age and then regresses gradually, tonsillectomy is usually delayed unless the frequency of infection necessitates it absolutely. The number prompting tonsillectomy varies with the severity of the episodes. One case, even severe, is generally not enough for most surgeons to decide tonsillectomy is necessary. Paradise in 1983 defined recurrent tonsillitis warranting surgery by the attack frequency standard as
Seven or more in a year, five or more per year for two years, or three or more per year for three years. These are the absolute indications for tonsillectomy.
According to the 2012 guidelines of the American Academy of Otolaryngology & Head and Neck Surgery (AAO-HNS), tonsillectomy is indicated as follows:
Clinicians may recommend tonsillectomy for recurrent throat infection with a frequency of at least 7 episodes in the past year or at least 5 episodes per year for 2 years or at least 3 episodes per year for 3 years with documentation in the medical record for each episode of sore throat and one or more of the following: temperature >38.3 °C, cervical adenopathy, tonsillar exudates, or positive test for Group A Beta- hemolytic strep.
Tonsillectomy is also sometimes performed on those who suffer chronically from tonsilloliths.
Most recently, the American Academy of Otolaryngology-Head and Neck Surgery Foundation has published clinical practice guidelines. The panel made a strong recommendation for the following:
- Watchful waiting for recurrent throat infection if there have been fewer than 7 episodes in the past year or fewer than 5 episodes per year in the past 2 years or fewer than 3 episodes per year in the past 3 years;
- Assessing the child with recurrent throat infection who does not meet criteria in statement 2 for modifying factors that may nonetheless favor tonsillectomy, which may include but are not limited to multiple antibiotic allergy/intolerance, periodic fever, aphthous stomatitis, pharyngitis and adenitis, or history of peritonsillar abscess;
- Asking caregivers of children with sleep-disordered breathing and tonsil hypertrophy about comorbid conditions that might improve after tonsillectomy, including growth retardation, poor school performance, enuresis, and behavioral problems;
- Counseling caregivers about tonsillectomy as a means to improve health in children with abnormal polysomnography who also have tonsil hypertrophy and sleep-disordered breathing;
- Counseling caregivers that sleep-disordered breathing may persist or recur after tonsillectomy and may require further management;
- Advocating for pain management after tonsillectomy and educating caregivers about the importance of managing and reassessing pain; and
- Clinicians who perform tonsillectomy should determine their rate of primary and secondary post-tonsillectomy hemorrhage at least annually.
Effectiveness
The scientific evidence indicates that tonsillectomy is only modestly effective at reducing the frequency and severity of sore throats, and does not get rid of sore throats altogether, probably because most sore throats are not caused by infected tonsils. Benefits also appear to only last for one or two years after surgery as children usually outgrow tonsil related diseases (which is why children are sometimes removed from the waiting list), making surgery seem more effective than it really is. Some patients do experience long term results, although more information and studies need to be done to portray the full picture on the matter. Most parents and patients are satisfied with the results of tonsillectomy, but it should be kept in mind that their views are prone to bias.
This raises questions about which children benefit enough to justify undertaking the operation. Even in children who meet strict criteria indicating that they are severely affected by sore throats, the evidence indicates that there is only a short term benefit. Without tonsillectomy a child who meets these strict criteria will probably have 6 sore throats in the next two years and one who has surgery will probably have 3 sore throats in the next two years. After two years there is little difference in the frequency of sore throats whether or not the child has surgery. Children with undocumented sore throats or sore throats that are not as severe do not appear to suffer from as many sore throats in subsequent years and therefore tonsillectomy is not worthwhile.
The strict criteria are that children should have experienced: - 7 documented sore throats in the previous year, - or 5 each year in the two previous years, - or 3 each year in the three previous years and that sore throats should include documented evidence of enlarged lymph glands, or raised temperature, or positive throat swabs (demonstrating Streptococcal infection) or pus seen on the tonsils.
The term "sore throat" is preferred to "throat infection" or "tonsillitis" because without undertaking throat swabs, doctors cannot reliably distinguish between sore throats caused by infection and those due to other causes. Furthermore the same patient may be described as suffering from "tonsillitis" or "sore throat" by another, therefore the use of one term rather than the other is as dependent on the doctor as well as the patient, making it an unreliable reason for undertaking surgery.
Many tonsillectomies are also undertaken for sleep apnea but for this there is insufficient evidence to say if this is more effective than no surgery. Because the effectiveness of tonsillectomy for breathing related problems is not known there are ongoing clinical trials to investigate whether it is effective.
Overtreatment with tonsillectomy
There are significant differences in tonsillectomy rates, both between and within countries, indicating that many tonsillectomies may in fact be done without sufficient medical justification. (The Dartmouth Atlas of Health Care. Tonsillectomies per 1000 children.) In 2015, tonsillectomy rates in Belgium, Finland and Norway were twice those in the UK but rates in Spain, Italy and Poland were at least a quarter lower. (Eurostat) Childhood tonsillectomy rates are three times higher in the USA than England and are among the highest rates in the world.
A 2010 study found that, between 2000 and 2005, the highest regional annual tonsillectomy rate in England was 754 per 100.000, which was more than twice the average of 304 per 100.000 and seven times as high as the lowest one of 102 per 100.000. In 2006, Chief Medical Officer Liam Donaldson revealed that unnecessary tonsillectomies and unnecessary hysterectomies combined cost the British National Health Service 21 million Pounds a year.
The reasons why ENT surgeons remove tonsils are complex and include clinician and patient beliefs about effectiveness. Financial incentives and parental pressure are also believed to play a role. But there is insufficient scientific evidence from randomised controlled trials to support the use of tonsillectomy for obstructive sleep apnea for recurrent sore throat unless it meets the criteria specified above. There is evidence that tonsillectomy imposes both short term and long term risks on the patient. There is evidence in the United Kingdom, which has a moderately high tonsillectomy rate (lower rates than the US, Germany, Norway, Belgium, higher than Spain or Italy) that most children undergoing tonsillectomy did not benefit from the procedure. And even if children do benefit, then it is still questionable whether the benefits justify both the short and long term risks associated with tonsillectomy.
Many people believe that enlarged tonsils are inflamed (and should therefore be removed), but this is not necessarily the case as the tonsils reach their maximum size between the ages of 5 and 7 and shrink afterwards. Also, enlarged tonsils may very well be the result of disease rather than its cause. Therefore, enlargement is nowadays only considered by surgeons a valid reason for surgery if the tonsils are so large that they are causing airway obstruction.
In the past decades however, tonsillectomies have become less frequent because of awareness that watchful waiting is often preferable to surgery as complaints often spontaneously resolve with age. Furthermore a growing number of doctors believe that the tonsils play an important, if not very important role in the human immune system as the first line of defence. It is generally agreed that even when complaints are severe, not performing surgery will not cause serious complications.
Surgical procedure
For the past 50 years at least, tonsillectomy has been performed by dissecting the tonsil from its surrounding fascia, a so-called total, or extra-capsular tonsillectomy. Problems including pain and bleeding led to a recent resurgence in interest in sub-total tonsillectomy or tonsillotomy, which was popular 60-100 years ago, in an effort to reduce these complications. The generally accepted procedure for 'total' tonsillectomy uses a scalpel and blunt dissection or electrocautery, although harmonic scalpels or lasers have also been used. Bleeding is stopped with electrocautery, ligation by sutures, and the topical use of thrombin, a protein that induces blood clotting.
The main question of importance becomes whether or not the benefits of subtotal tonsillectomy in obstructive sleep apnea are enduring. There have been no randomised controlled trials of long term effectiveness of tonsillectomy for sleep apnea.
Methods
The scalpel is the preferred surgical instrument of many ear, nose, and throat specialists. However, there are other techniques and a brief review of each follows:
- Dissection and snare method: Removal of the tonsils by use of a forceps and scissors with a wire loop called a snare was formerly the most common method practiced by otolaryngologists, but has been largely replaced in favor of other techniques. The procedure requires the patient to undergo general anesthesia; the tonsils are completely removed and the remaining tissue surface is cauterized. The patient will leave with minimal post-operative bleeding.
- Electrocautery: Electrocautery uses electrical energy to separate the tonsillar tissue and assists in reducing blood loss through cauterization. Research has shown that the heat of electrocautery (400 °C) may result in thermal injury to surrounding tissue. This may result in more discomfort during the postoperative period.
- Radiofrequency ablation: Monopolar radiofrequency thermal ablation transfers radiofrequency energy to the tonsil tissue through probes inserted in the tonsil. The procedure can be performed in an office (outpatient) setting under light sedation or local anesthesia. After the treatment is performed, scarring occurs within the tonsil causing it to decrease in size over a period of several weeks. The treatment can be performed several times. The advantages of this technique are minimal discomfort, ease of operations, and immediate return to work or school. Tonsillar tissue remains after the procedure but is less prominent. This procedure is recommended for treating enlarged tonsils and not chronic or recurrent tonsillitis.
- Coblation tonsillectomy: This surgical procedure is performed using plasma to remove the tonsils. Coblation technology combines radiofrequency energy and saline to create a plasma field. The plasma field is able to dissociate molecular bonds of target tissue while remaining relatively cool (40-70 °C), which results in minimal or no damage to surrounding healthy tissue. A Coblation tonsillectomy is carried out in an operating room setting, with the patient under general anesthesia. Tonsillectomies are generally performed for two main reasons: tonsillar hypertrophy (enlarged tonsils) and recurrent tonsillitis. It has been claimed that this technique results in less pain, faster healing, and less post operative care. However, review of 21 studies gives conflicting results about levels of pain, and its comparative safety has yet to be confirmed. This technique has been criticized for a higher than expected rate of bleeding presumably due to the low temperature which may be insufficient to seal the divided blood vessels but several papers offer conflicting (some positive, some negative) results. More recent studies of coblation tonsillectomy indicate reduced pain and ostalgia; less intraoperative or postoperative complications; lesser incidence of delayed hemorrhage, more significantly in pediatric populations, less postoperative pain and early return to daily activities, fewer secondary infections of the tonsil bed and significantly lower rates of secondary hemorrhage. Unlike the electrosurgery procedure, Coblation Tonsillectomy generates significantly lower temperatures on contacted tissue. Long term studies seem to show that surgeons experienced with the technique have very few complications.
- Harmonic scalpel: This medical device uses ultrasonic energy to vibrate its blade at 55kHz. Invisible to the naked eye, the vibration transfers energy to the tissue, providing simultaneous cutting and coagulation. The temperature of the surrounding tissue reaches 80 °C. Proponents of this procedure assert that the end result is precise cutting with minimal thermal damage.
- Thermal Welding: A new technology which uses pure thermal energy to seal and divide the tissue. The absence of thermal spread means that the temperature of surrounding tissue is only 2-3 °C higher than normal body temperature. Clinical papers show patients with minimal post-operative pain (no requirement for narcotic pain-killers), zero edema (swelling) plus almost no incidence of bleeding. Hospitals in the US are advertising this procedure as "Painless Tonsillectomy". Also known as Tissue Welding.
- Carbon dioxide laser: When a laser is used to perform tonsillectomy, it can be under local anaesthetic with anaesthetic spray only, called tonsillotomy (or tonsil resurfacing), or it can be performed under general anaesthetic when it is called intra-capsular tonsillectomy, using an operating microscope for magnification. The carbon dioxide laser in scanning mode is an excellent vapouriser of tissue, and in conjunction with a computerised pattern generator and operating microscope with micromanipulator, it can result in near total removal of tonsil tissue whilst preserving the capsule of the tonsil. This leads to a significantly reduced bleeding and pain rate (Mehta et al www.academia.edu/8734771). The local anaesthetic technique takes around 10 minutes, the general around 20 minutes depending on the size of the tonsils - the bigger they are, the longer it takes. The general anaesthetic operation has a revision rate of 1:50, the local anaesthetic tonsillotomy 1:4.5. This is different from procedures where a laser is used to reduce or resurface the tonsils (e.g. laser cryptolysis). Providing the absence of certain contra-indications such as sensitive gag reflex, LAST can be performed under local anesthetic as an outpatient procedure. A carbon dioxide laser is commonly used, and is swept over each tonsil 8-10 times. The smoke is aspirated out of the mouth to prevent smoke inhalation. Often, more than one procedure is required, each lasting about 20 minutes. Due to the frequent requirement for multiple sessions, this treatment may work out more expensive than a single session tonsillectomy. A degree of patient compliance is required, making it unsuitable for young children and anxious persons, who risk harm if they move during the procedure.
- Microdebrider: The microdebrider is a powered rotary shaving device with continuous suction often used during sinus surgery. It is made up of a cannula or tube, connected to a hand piece, which in turn is connected to a motor with foot control and a suction device. The endoscopic microdebrider is used in performing a partial tonsillectomy, by partially shaving the tonsils. This procedure entails eliminating the obstructive portion of the tonsil while preserving the tonsillar capsule. A natural biologic dressing is left in place over the pharyngeal muscles, preventing injury, inflammation, and infection. The procedure results in less post-operative pain, a more rapid recovery, and perhaps fewer delayed complications. However, the partial tonsillectomy is suggested for enlarged tonsils--not those that incur repeated infections.
Post-operative care
A sore throat will persist approximately two weeks following surgery while pain following the procedure is significant and may necessitate a hospital stay. Recovery can take from 7 to 10 days and proper hydration is very important during this time, since dehydration can increase throat pain, leading to a vicious circle of poor fluid intake.
At some point, most commonly 7-11 days after the surgery (but occasionally as long as two weeks (14 days) after), bleeding can occur when scabs begin sloughing off from the surgical sites. The overall risk of bleeding is approximately 1-2%. It is higher in adults, especially males over age 70 and three quarters of bleeding incidents occur on the same day as the surgery. Approximately 3% of adult patients develop significant bleeding at this time which may sometimes require surgical intervention.
Post-operative pain relief is subject to change. Traditionally, pain relief has been provided by relatively mild narcotic analgesics such as Acetaminophen with codeine, for milder pain, and stronger narcotic analgesics for more severe pain. Recently (January 2011), the FDA reduced the recommended total 24-hour dose because of concern about liver toxicity from the Acetominophen component. An alternative is the use of non-steroidal anti-inflammatory agents, themselves giving rise to concerns that their effect on platelets might increase the risk of post-operative bleeding. In turn, this has renewed interest in techniques other than traditional 'extra-capsular excision' in the hope that post-operative pain might be reduced.
Tonsillectomy appears to be more painful in adults than children, although there will be individual variations in response.
Complications
Although tonsillectomy is a relatively safe surgery, serious complications (especially hemorrhage, dehydration and infection) and death do sometimes occur. Minor complications include voice change and taste disturbance. Because tonsillectomy takes place under general anaesthesia, there is a small risk of brain damage. The morbidity rate associated with tonsillectomy s 2% to 4% due to post-operative bleeding; in the US 3.6% of children are readmitted to hospital following tonsillectomy, mainly because of dehydration or bleeding. The mortality rate is 1 in 15,000, due to bleeding, airway obstruction, or anesthesia complications.
A single dose of the corticosteroid drug dexamethasone may be given during surgery to prevent post-operative vomiting. A systematic review found that a dose of dexamethasone during surgery can prevent vomiting in one out of every five children who receives the drug. The review also found that these children return to a normal diet more quickly and have less post-operative pain.
A recent study states that tonsillectomies in young children (0 to 7 years) are correlated with weight gain in the years following surgery. However, no causal effect has been established.
Impact on immune system
It remains controversial whether tonsillectomy negatively affects the immune system. However, multiple studies have confirmed correlation between a previous history of tonsillectomy and a wide range of diseases, such as the following:
Moreover, other studies have found that tonsillectomy may lead to the following:
- a decrease in levels of serum immunoglobulin
- a permanent decrease in levels of secretory immunoglobulin A
- a permanent decrease in levels of immunoglobulin G3
- an increased risk of autoimmune disease
- a 50% increase in mortality between the age of 18 and 44 (if performed before the age of 7)
- a nine fold increased risk of chronic disease
- an increase in overall cancer risk
- a two to three fold increased risk of respiratory diseases (which means that for every five tonsillectomies, one extra case of respiratory disease will be caused)
- an increased risk of infectious diseases
- an increased risk of allergies
Image gallery
See also
- Tonsillolith (tonsil stones)
References
Further reading
External links
- Tonsillectomy Procedures
- ENT Matters: Tonsillectomy
- drtbalu otolaryngology on line
- History of tonsillectomy
- Tonsillectomy new vistas
- Laser Tonsillectomy Procedure
- Study: Tonsil and adenoid removal associated with respiratory diseases, allergies and infections
- Having tonsils out as a child increases risk of infections and lung complaints for life, finds study
Source of article : Wikipedia
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