Errors in Procedural Sedation & Analgesia

Procedural sedation is its own high-risk ED procedure, and the complication that matters most is hypoventilation. Safe PSA hinges on preparation, early recognition of respiratory decline, and choosing short-acting agents that match the pace of emergency care.

Procedural Sedation Safety

• Hypoventilation as core hazard: PSA failures are usually respiratory, not procedural; hypoventilation from upper-airway obstruction or central apnea can be easy to miss when attention shifts to the reduction or repair.
• Preparation before first drug: A checklist-based setup matters more than any sedative choice: airway equipment, suction, monitoring, and full intubation capability including a paralytic should be at the bedside.
• Risk stratification upfront: Pulmonary comorbidity, difficult-airway features, and overall anesthetic risk should decide whether ED sedation is appropriate or whether delay, anesthesia support, or another strategy is safer.
• Oxygenation during PSA: Preoxygenation and continuous oxygen delivery are standard, with capnography layered into nasal cannula use and higher-level support considered for the highest-risk patients. We get into the setup nuances in the episode.
• Single-provider backup plan: If a second physician is not available, PSA still needs a dedicated in-room monitor; an additional RN focused on ventilation can catch respiratory decline before the pulse oximeter does.

Recognizing and Treating Hypoventilation

• Early respiratory clues: Capnography and bedside observation matter because pulse oximetry can stay falsely reassuring during rising CO2, especially when supplemental oxygen is already on board.
• First rescue maneuvers: The safest first response is to stop sedatives, realign the head and neck, elevate the head of bed when possible, and perform a firm jaw thrust to reopen the airway.
• Bag-mask ventilation caution: Bag-mask ventilation is a rescue skill, but in PSA it also raises regurgitation risk, so simple airway maneuvers and positioning should be optimized before squeezing the bag.
• Readiness to intubate: Any PSA team must be prepared to convert immediately to definitive airway management if ventilation cannot be restored quickly. That threshold is worth hearing in the chapter.

Medication Choices for PSA

• Retiring classic combinations: Fentanyl plus midazolam remains common, but its slower onset and longer duration make delayed hypoventilation more likely after the procedure seems finished.
• Faster on faster off: Propofol and ketamine fit ED procedural sedation better because they have rapid onset and shorter clinical duration, giving the operator tighter control over sedation depth.
• Conscious sedation misnomer: Moderate or conscious sedation implies responsiveness to voice or light touch, but PSA often requires a deeper level tailored to the procedure rather than the label.
• Fasting before ED PSA: ACEP does not recommend delaying emergency department PSA for fasting status alone, a practice point that still surprises many clinicians.

References:

1. Godwin SA, Burton JH, Gerardo CJ, et al. Clinical policy: procedural sedation and analgesia in the emergency department [published correction appears in Ann Emerg Med. 2017 Nov;70(5):758]. Ann Emerg Med. 2014;63(2):247-58.e18. PMID: 24438649.
2. Witting MD, Hsu S, Granja CA. The sensitivity of room-air pulse oximetry in the detection of hypercapnia. Am J Emerg Med. 2005;23(4):497-500. PMID: 16032619