Post-Anesthesia Care and Recovery Management Flashcards

A patient in the PACU following IV sedation with propofol and fentanyl begins exhibiting laryngospasm. After repositioning the jaw and administering 100% O₂ via positive pressure, the spasm persists. Which pharmacological intervention is the most appropriate next step?

Answer: Succinylcholine 0.1–0.2 mg/kg IV (small "break" dose)

Persistent laryngospasm unresponsive to positive-pressure O₂ and jaw-thrust requires pharmacological relaxation of the vocal cords. A sub-paralytic ('break') dose of succinylcholine (0.1–0.2 mg/kg IV) relieves the spasm without causing full apnea in most patients. Neostigmine reverses non-depolarizing neuromuscular blockade and has no role here. Flumazenil reverses benzodiazepines but propofol is not a benzodiazepine. Naloxone addresses opioid effects but not true laryngospasm.

Emergence delirium differs from postoperative delirium in that emergence delirium characteristically occurs within the first 30 minutes of recovery and is most strongly associated with which agent?

Answer: Ketamine administration without a benzodiazepine premedication

Ketamine, a dissociative anesthetic, is the agent most classically associated with emergence delirium, manifesting as vivid dreams, hallucinations, and agitation upon awakening. Premedication with a benzodiazepine (e.g., midazolam) significantly reduces this incidence. Propofol infusions are associated with PRIS (propofol infusion syndrome), not emergence delirium. Midazolam in the elderly can cause confusion but is not the hallmark cause of emergence delirium. High-dose fentanyl may cause rigidity, not delirium.

In the post-anesthesia care unit, a patient who received neostigmine for reversal of rocuronium-induced neuromuscular blockade now presents with bradycardia (HR 38 bpm), excessive salivation, and bronchospasm. Which intervention is immediately indicated?

Answer: Atropine 0.5–1.0 mg IV to block muscarinic overstimulation

Neostigmine, an acetylcholinesterase inhibitor, increases ACh at all cholinergic synapses. When muscarinic effects are not adequately countered by the co-administered anticholinergic (typically glycopyrrolate or atropine), bradycardia, bronchospasm, and excessive secretions result — a cholinergic crisis. Atropine 0.5–1.0 mg IV rapidly antagonizes muscarinic receptors and is the correct immediate treatment. Epinephrine is used for anaphylaxis, not a pure muscarinic crisis. Glycopyrrolate is slower and less penetrant than atropine. Sugammadex reverses rocuronium but does not address the neostigmine-induced muscarinic excess.

A post-sedation patient's SpO₂ drops to 88% despite an open airway, jaw-thrust, and supplemental O₂ at 6 L/min via nasal cannula. Breath sounds are equal bilaterally and respiratory rate is 18/min. The MOST likely etiology and best next intervention is:

Answer: Diffusion hypoxia from nitrous oxide; switch to high-flow 100% O₂ via non-rebreather mask

Diffusion hypoxia occurs in the immediate post-anesthesia period when large volumes of nitrous oxide (N₂O) rapidly diffuse from blood into alveoli, diluting O₂ and CO₂. It is characteristically brief (5–10 min) and corrected by administration of 100% O₂ via a high-flow non-rebreather mask. Opioid-induced hypoventilation would present with a low respiratory rate and increased EtCO₂. Equal breath sounds argue against bronchospasm. Pulmonary embolism is possible but is not the most likely immediate post-sedation cause with intact breath sounds and normal RR.

During Phase I PACU recovery after IV sedation, a patient's Aldrete score is 8/10, with 1 point deducted each for SpO₂ requiring supplemental O₂ and mild limb weakness. According to modified Aldrete scoring criteria, the appropriate action is:

Answer: Continue Phase I monitoring; a score < 9 requires the patient to remain until criteria improve or a physician authorizes transfer

The modified Aldrete Score requires a minimum of 9–10 out of 10 for discharge from Phase I PACU to Phase II or home. A score of 8 indicates that two clinical parameters remain sub-optimal (here, oxygenation and motor function), requiring continued monitoring. Discharge to home (Option A) is inappropriate below the threshold. Phase II transfer/bypass (Option C) typically requires a score ≥ 9, not 8. Reversal agents (Option D) are not mandated solely by the numeric score — they depend on clinical context.

A 54-year-old patient with a history of obstructive sleep apnea (OSA) and a BMI of 38 is in PACU recovery following 45 minutes of IV sedation with midazolam and an opioid. The anesthesiologist has left the building. The patient is snoring loudly with an SpO₂ of 91% and is difficult to arouse. After repositioning and applying O₂, the DAANCE-certified assistant notes no improvement. The single most important action within the scope of the dental anesthesia assistant's role is:

Answer: Activate EMS (call 911), apply a jaw-thrust with 100% O₂, and continue monitoring until advanced help arrives

A patient with severe OSA and morbid obesity presenting with SpO₂ 91% and decreased arousability unresponsive to repositioning and supplemental O₂ represents a high-risk airway emergency. The DAANCE-certified assistant's scope of practice is to provide basic airway support (jaw-thrust, supplemental O₂, basic airway adjuncts) and activate the emergency medical system — NOT to independently intubate or administer reversal agents without a supervising provider present. With the anesthesiologist off-site, calling 911 for advanced life support is the correct priority alongside maintained airway support. Option A is reasonable adjunct support but omits the critical step of activating EMS in a deteriorating patient with an absent supervising provider. Option C (intubation) is outside DAANCE scope. Option B alone is insufficient for this severity.