Procedural sedation and office-based anesthesia
Stem
A 61-year-old woman, 104 kg, BMI 38, is scheduled for upper-eyelid blepharoplasty under IV sedation in a plastic surgeon's accredited office suite. She snores loudly, her husband reports pauses in her breathing, and she has treated hypertension; her STOP-BANG score is 5 and she has never had a sleep study. The surgeon will use electrocautery near her face. You are the only anesthesia provider on site.
Question
Is she an appropriate candidate for this office, and how will you conduct her sedation?
Ideal answer
HeadlineOnly if this office can rescue her, given likely untreated sleep apnea; otherwise a hospital-based setting. Then moderate sedation, capnography and mostly local anesthetic.
- Check the office meets the ASA standard: reliable oxygen, backup at least a full E cylinder, suction, an emergency cart with a defibrillator, advanced-resuscitation staff immediately available until she goes home, a written transfer protocol.1
- Aim for moderate sedation: purposeful response, no airway support; I must be able to rescue her from deeper than I intended.2
- ASA basic standards plus continuous capnography, because she will obstruct before she desaturates.3
- Small increments of short-acting drug, little or no opioid, with the surgeon's local anesthetic doing most of the work.3
- Least oxygen that keeps her saturated; surgeon warns before cautery, because electrocautery near her face makes oxygen a fuel. Naloxone and flumazenil are in the room.3
Breaking down the answer
- The office is part of the assessment — the ASA expects patients at undue risk to be referred to an appropriate facility, and lists equipment, staff, transfer and emergency protocols, and mock drills.1 A short eyelid case, light sedation and no postoperative opioids fit there.
- Sedation is a continuum — minimal, moderate, deep and general anesthesia are defined by responsiveness, airway, ventilation and cardiovascular function, and the practitioner must be able to rescue from the next level down.2
- Capnography is the early warning — the 2018 guideline recommends continual capnography unless the patient, procedure or equipment precludes it.3 In an obese patient with sleep apnea, apnea shows on the waveform minutes before pulse oximetry falls.
- A separate set of eyes — someone other than the person doing the procedure monitors throughout, with blood pressure measured at intervals such as every 5 minutes.3
- More oxygen means a secured airway — eyelid surgery puts electrocautery inches from an oxygen-enriched mask; if she needs more oxygen, she needs a secured airway, not more sedation.
- Discharge is a physician decision — documented in the record,1 with a responsible adult and sleep apnea precautions at home.
Follow-up question
Ten minutes in, after two small propofol boluses for the injection of local anesthetic, she does not respond to a jaw thrust, the capnogram is flat, and her SpO2 is 88% and falling. The surgeon has the cautery in hand.
What do you do?
Follow-up answer
HeadlineShe has slipped into general anesthesia with complete obstruction. I say it aloud: "Stop the cautery; she's not breathing."
I stop the propofol and take over her airway, because rescuing from a deeper level than intended is my responsibility.2 Oral or nasal airway and bag-valve mask; oxygen goes up only after the surgeon confirms the cautery is off and the field is clear. If she received an opioid or benzodiazepine, I give naloxone or flumazenil, and observe until sedation cannot return.3 If I cannot oxygenate her, I place a supraglottic airway and activate the office's transfer protocol to the hospital.1 Once breathing, I reassess whether the case can continue under local anesthesia alone.
Pitfalls that cost points
- Accepting any patient because the case is short, without assessing the office.
- Discharging after reversal without an observation period.
Rapid-fire
Q: How is moderate sedation defined? A: Purposeful response to verbal or tactile stimulation, no airway intervention required, adequate ventilation, cardiovascular function usually maintained.2
Q: How does deep sedation differ? A: Purposeful response only after repeated or painful stimulation, airway support may be needed. Reflex withdrawal is not purposeful: deeper than deep sedation, consistent with general anesthesia.2
Q: What must an office have for malignant hyperthermia? A: Where triggering agents are on site, the drugs, equipment and written protocols to treat it.1
Q: Should supplemental oxygen be used during moderate sedation? A: Yes, unless specifically contraindicated.3
Q: What changes for a child? A: AAP/AAPD: moderate sedation needs an observer who should be PALS-trained and may help with interruptible tasks; deep sedation needs an independent observer who only monitors, and capnography in almost all.4
Q: How long must a child fast, and what if they have not? A: Clear liquids 2 hours, human milk 4, formula, nonhuman milk or a light meal 6; if not fasted, ketamine or moderate sedation spares airway reflexes better.4
Numbers to know
| Item | Value |
|---|---|
| Backup oxygen in an office | At least a full E cylinder equivalent1 |
| Blood pressure during sedation | Continually, e.g., every 5 min3 |
| Levels on the continuum | 4: minimal, moderate, deep, general2 |
| Advanced-resuscitation staff | Immediately available until all patients are discharged1 |
| Pediatric vital-sign recording | Every 10 min moderate; every 5 min deep4 |
| Pediatric fasting (elective) | Clears 2 h; human milk 4 h; formula or light meal 6 h4 |
| Pediatric discharge (a simple evaluation tool) | Stays awake ≥20 min in a quiet room4 |
Links
- Ambulatory anesthesia and discharge criteria, Obstructive sleep apnea, Airway fire, Opioids and postoperative respiratory depression, Capnography: waveforms and sudden loss of ETCO2
- ASA Statement on Office-Based Anesthesia (2024); ASA Practice Guidelines for Moderate Procedural Sedation and Analgesia (2018); ASA Continuum of Depth of Sedation (2024)
Sources
- 1.Statement on Office-Based Anesthesia · ASA, 2024 · asahq.orgCommittee on Ambulatory Surgical Care; last amended October 23, 2024.
- 2.Statement on Continuum of Depth of Sedation: Definition of General Anesthesia and Levels of Sedation/Analgesia · ASA, 2024 · asahq.orgLast amended October 23, 2024.
- 3.Practice Guidelines for Moderate Procedural Sedation and Analgesia 2018 · ASA, 2018 · medic.usm.myAnesthesiology 2018;128:437-79; full-text copy hosted by Universiti Sains Malaysia.
- 4.Guidelines for Monitoring and Management of Pediatric Patients Before, During, and After Sedation for Diagnostic and Therapeutic Procedures · AAPD / AAP, 2025 · aapd.orgPediatr Dent 2025;47(6):E100-E128, reaffirmed June 2025. Table 1 fasting; Table 2 personnel; vitals every 10 min (moderate) / 5 min (deep); ketamine preferred for nonfasted emergencies.
Facts on this page were checked against these sources on Oct 16, 2026. Guidelines change; confirm doses against current institutional protocols.