GENERAL ANESTHESIA FOR DENTAL OFFICES CASE PRESENTATION: A 5-year-old developmentally delayed autistic boy has multiple dental cavities. The dentist consults you, a physician anesthesiologist, to do sedation or anesthesia for dental restoration. What do you do?
DISCUSSION: Children periodically die in dental offices due to complications of general anesthesia or intravenous sedation. Links to recent reports include the following:
A 3-year-old girl dies in San Ramon, CA after a dental procedure in July 2016.
A 14-month-old child, scheduled to have 2 cavities filled, dies in an Austin, TX dental office. The dentist and an anesthesiologist were both present.
A 6-year-old boy, scheduled to have teeth capped at a dental clinic, has anesthesia and dies after the breathing tube is removed.
Another 6-year-old boy, scheduled to have a tooth extracted by an oral surgeon, dies after the oral surgeon administers general anesthesia.
Pediatric dentists use a variety of tactics to keep a typical child calm during dental care. The child is encouraged to view a movie or cartoon while the dental hygienist or dentist works. The parent or parents are encouraged to sit alongside their child to provide emotional support. If a typical child requires a filling for a cavity, the dentist can utilize nitrous oxide via a nasal mask with or without local anesthesia inside the mouth.
These simple methods are not effective if the child has a developmental delay, autism, behavioral problems, or if the child is very young. Such cases sometimes present to a pediatric hospital for anesthetic care, but at times the child will be treated in a dental office. Possible anesthesia professionals include a physician anesthesiologist, a dental anesthesiologist, or an oral surgeon (who is trained in both surgery and anesthesia).
HOW WOULD A PHYSICIAN ANESTHESIOLOGIST ANESTHETIZE A CHILD IN A DENTAL OFFICE?
There are a variety of techniques an anesthesiologist might use to sedate or anesthetize a young child. The correct choice is usually the simplest technique that works. Alternative methods include intramuscular sedation, intravenous sedation, or potent inhaled anesthetics.
The first decision is how to begin the anesthetic on an uncooperative child. Options for anesthesia induction include:
- Intramuscular sedation. A typical recipe is the combination of 2 mg/kg of ketamine, 0.2 mg of midazolam, and .02 mg/kg of atropine. These three medications are drawn up in a single syringe and injected into either the deltoid muscle at the shoulder or into the muscle of the anterior thigh. Ketamine is a general anesthetic drug that induces unconsciousness and relieves pain. Midazolam is a benzodiazepine which induces sleepiness and decreases anxiety. Ketamine can cause intense dreams which may be frightening. Midazolam is given because it minimizes ketamine dreams. Atropine offsets the increased oral secretions induced by ketamine. Within minutes after the injection of these three drugs, the child will become sleepy and unresponsive, and the anesthesiologist can take the child from the parent’s arms and bring the patient into the operating room. Most anesthesiologists will insert an intravenous catheter into the patient’s arm at this point, so any further doses of ketamine, midazolam, or propofol can be administered through the IV.
- Oral sedation with a dose of 0.5-0.75 mg/kg of oral midazolam syrup (maximum dose 20 mg). If the child will tolerate drinking the oral medication, the child will become sleepy within 15- 20 minutes. At this point, the anesthesiologist can take the patient away from the parent and proceed into the operating room, where either an intravenous anesthetic or an inhaled sevoflurane anesthetic can be initiated.
MONITORING THE PATIENT:
- The patient should have all the same monitors an anesthesiologist would use in a hospital or a surgery center. This includes a pulse oximeter, an ECG, a blood pressure cuff, a monitor of the exhaled end-tidal carbon dioxide, and the ability to monitor temperature.
- The anesthesiologist is the main monitor. He or she will be vigilant to all vital signs, and to the Airway-Breathing-Circulation of the patient.
MAINTENANCE OF ANESTHESIA:
- Regardless of which anesthetic regimen is used, oxygen will be administered. Room air includes only 21% oxygen. The anesthesiologist will administer 30-50% oxygen or more as needed to keep the patient’s oxygen saturation >90%.
- Intravenous sedation: This may include any combination of IV midazolam, ketamine, propofol, or a narcotic such as fentanyl.
- Local blocks by the dentist. The dentist may inject local anesthesia at the base of the involved tooth, near the superior alveolar nerve to block all sensation to the upper teeth, or near the inferior alveolar nerve to anesthetize all sensation to the lower jaw.
- Inhaled nitrous oxide. The simplest inhaled agent is nitrous oxide, which is inexpensive and rapid acting. Used alone, nitrous oxide is not potent enough to make a patient fall asleep. Nitrous oxide can be used as an adjunct to any of the other anesthetic drugs listed in this column.
- Potent inhalation anesthesia (sevoflurane). Most dental offices will not have a machine to administer sevoflurane. (Every hospital operating room has an anesthesia machine which delivers sevoflurane vapor.) Portable anesthesia machines fitted with a sevoflurane vaporizer are available. A colleague of mine who worked full time as a roving physician anesthesiologist to multiple pediatric dental offices leased such a machine and used it for years. The advantages of sevoflurane are: i) few intravenous drugs will be necessary if the anesthesiologist uses sevo, and ii) the onset and offset of sevo is very fast—as fast as nitrous oxide. The administration of sevoflurane usually requires the use of a breathing tube, inserted into the patient’s windpipe.
- The anesthesiologist will be present during the entire anesthetic, and will not leave.
AWAKENING FROM ANESTHESIA:
- With intramuscular and/or intravenous drugs, the wake-up is dependent on the time it takes for the administered drugs to wear off or redistribute out of the blood stream. This may take 30-60 minutes or more following the conclusion of the anesthetic.
- With inhaled agents such as sevoflurane and nitrous oxide, the wake-up is dependent on the patient exhaling the anesthetic gas. The majority of the inhaled anesthetic effect is gone within 20-30 minutes after the anesthetic is discontinued.
- The patient must be observed and monitored until he or she is alert enough to be discharged from the medical facility. This can be challenging if a series of patients are to be anesthetized in a dentist’s office. The medical staff must monitor the post-operative patient and also attend to the next patient’s anesthetic care. It’s imperative that the earlier patient is awake before the anesthesiologist turns his full attention to the next patient.
THE ANESTHETIC FOR OUR CASE PRESENTATION ABOVE:
- The anesthesiologist meets the parents and the patient, and explains the anesthetic options and procedures to the parent. The parent then consents.
- The anesthesiologist prepares the dental operating room with all the necessary equipment in the mnemonic M-A-I-D-S, which stands for Monitors and Machine, Airway equipment, Intravenous line, Drugs, and Suction.
- The anesthesiologist injects the syringe of ketamine, midazolam, and atropine into the child’s deltoid muscle. The child becomes sleepy and limp within one minute, and the anesthesiologist carries the child into the operating room.
- All the vital sign monitors are placed, and oxygen is administered via a nasal cannula.
- An IV is started in the patient’s arm.
- The dentist begins the surgery. He or she may inject local anesthesia as needed to block pain.
- Additional IV sedation is administered with propofol, ketamine, midazolam, or fentanyl as deemed necessary.
- When the surgery is nearing conclusion, the anesthesiologist will stop the administration of any further anesthesia. When the surgery ends, the anesthesiologist remains with the patient until the patient is awake. The patient may be taken to a separate recovery room, but that second room must have an oxygen saturation monitor and a health care professional to monitor the patient until discharge.
CHALLENGES OF DENTAL OFFICE ANESTHESIA:
- You’re do all the anesthesia work alone. If you have an airway problem or an acute emergency, you’ll have no other anesthesia professional to assist you. Your only helpers are the dentist and the dental assistant.
- The cases are difficult, otherwise you wouldn’t be there at all. Every one of the patients will have some challenging medical issue(s).
- You have no preop clinic, so you don’t know what you’re getting into until you meet the patient. I’d recommend you telephone the parents the evening before, so you can glean the past medical and surgical histories, and so you can explain the anesthetic procedure. Nonetheless, you can’t evaluate an airway over the phone, and on the day of surgery you may encounter more challenge than you are willing to undertake.
- It’s OK to cancel a case and recommend it be done in a hospital setting if you aren’t comfortable proceeding.
- The anesthesiologist usually has to bring his or her own drugs. The narcotics and controlled substances need to be purchased and accounted for by the anesthesiologist with strict narcotic logs to prove no narcotics are being diverted for personal use. All emergency resuscitation drugs need to be on site in the dental office or brought in by the anesthesiologist.
- If a sevoflurane vaporizer is utilized, dantrolene treatment for Malignant Hyperthermia must be immediately available.
BENEFITS OF DENTAL OFFICE SEDATION AND GENERAL ANESTHESIA:
- The parents of the patients are grateful. The parents know how difficult dental care on their awake child has been, and they’re thankful to have the procedures facilitated in a dental office.
- The dentist and their staff are grateful. They don’t have a method to safely sedate such patients, and are thankful that you do.
- Most cases are not paid for by health insurance, rather they are cash pay in advance.
HOW SAFE IS ANESTHESIA AND SEDATION IN A DENTAL OFFICE?
No database can answer the question at present. In 2013 the journal Paediatric Anesthesia published a paper entitled Trends in death associated with pediatric dental sedation and general anesthesia. (1) The paper reported on children who had died in the United States following receiving anesthesia for a dental procedure between1980-2011. Most deaths occurred among 2-5 year-olds, in an office setting, and with a general or pediatric dentist (not a physician anesthesiologist or dental anesthesiologist) as the anesthesia provider. In this latter group, 17 of 25 deaths were linked with a sedation anesthetic.
Another study analyzed closed claims databases of 17 malpractice claims of adverse anesthesia events in pediatric patients in dental offices from 1992 – 2007. (2) Thirteen cases involved sedation, 3 involved local anesthesia alone, and 1 involved general anesthesia. 53% of the claims involved patient death or permanent brain damage. In these claims the average patient age was 3.6 years. Six cases involved general dentists as the anesthesia provider, and 2 involved local anesthesia alone. The adverse event occurred in the dental office in 71% of the claims. Of the 13 claims involving sedation, only 1 claim involved the use of vital sign monitoring. The study concluded that very young patients (≤ 3-years-old) were at greatest risk during administration of sedative and/or local anesthetic agents. The study concluded that some practitioners were inadequately monitoring patients during sedation procedures. Adverse events had a high chance of occurring at the dental office where care is being provided.
If general anesthesia or deep sedation are performed in a dental office, the anesthetist must practice with the same vigilance and standards of care as they would in a hospital or surgery center. Either a physician anesthesiologist, an oral surgeon (acting as both the dental surgeon and the anesthetist), or a dental anesthesiologist may perform the anesthesia. There are no data at this time to affirm that a physician anesthesiologist is the safest practitioner in this setting.
Note: This column addressed the office practice of pediatric dental anesthesia as seen from a physician anesthesiologist’s point of view.
(1) Lee HH et al, Trends in death associated with pediatric dental sedation and general anesthesia. Paediatr Anaesth. 2013 Aug;23(8):741-6.
(2) Chicka MC et al, Adverse events during pediatric dental anesthesia and sedation: a review of closed malpractice insurance claims. Pediatr Dent.2012 May-Jun;34(3):231-8.
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In this debut thriller, tragedies strike an anesthesiologist as he tries to start a new life with his son.
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Nuanced characterization and crafty details help this debut soar.
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