Airway, Oxygenation, and Ventilation Priorities

Start With Airway Patency

A Certified Post Anesthesia Nurse (CPAN) monitoring item usually presents a patient who has just arrived from the operating room, is still sedated, and is drifting from stable to unstable. The first filter is simple: can air move in and out? Assess chest rise, breath sounds, work of breathing, head and jaw position, secretions, snoring, stridor, gag and cough strength, level of consciousness, and ability to follow commands.

When obstruction is likely, the first actions are mechanical and immediate: reposition the head and neck (unless contraindicated by surgery or injury), apply a chin lift or jaw thrust, suction visible secretions, deliver oxygen, and insert an oral or nasal airway adjunct if policy allows. Call anesthesia if the airway does not improve in seconds. Do not leave an obstructing patient to gather routine supplies or chart.

Oxygenation Versus Ventilation

This distinction is tested repeatedly. Oxygenation is reflected by SpO2; ventilation (CO2 clearance) is reflected by capnography (end-tidal carbon dioxide, ETCO2), respiratory rate, tidal volume, mental status, and arterial blood gases. A patient on supplemental oxygen can hold an SpO2 of 95-97% while CO2 rises dangerously from residual opioid, anesthetic, neuromuscular blockade, obesity hypoventilation, or obstructive sleep apnea. SpO2 alone can falsely reassure.

First-Action Logic

The safest exam answer restores oxygen delivery before comfort measures. A patient with severe pain and a respiratory rate of 8 does not get another opioid first; the nurse stimulates, supports ventilation, reassesses sedation, and escalates for reversal (naloxone for opioids, sugammadex or neostigmine per orders for residual blockade) or alternate analgesia. An OSA patient who repeatedly desaturates after opioids needs positioning, continuous monitoring, reduced sedative load, and continuous positive airway pressure (CPAP) if ordered.

For laryngospasm, treat it as an airway emergency: remove any obvious stimulus, suction, apply a firm jaw thrust, deliver 100% oxygen with positive-pressure ventilation, and summon anesthesia immediately. If the patient still cannot be ventilated, the team may give succinylcholine and reintubate. The nurse readies equipment and reports the trend.

Monitor the Monitor, Then the Patient

Equipment artifact can mimic deterioration but never replaces bedside assessment. Check probe placement, waveform quality, oxygen connections, and circuit tubing while simultaneously assessing skin color, air movement, pulse quality, and mental status. For an intubated patient with a high-pressure alarm, think the DOPE mnemonic: Displacement, Obstruction (secretions/biting/kink), Pneumothorax, and Equipment failure. Assess the patient and circuit in one rapid sweep.

Escalation Triggers

Escalate immediately for repeated obstruction, inability to maintain SpO2, apnea, cyanosis, bradypnea with declining consciousness, new stridor, suspected aspiration, difficult mask ventilation, or high ventilator-pressure alarms with distress. On the exam, the best response usually pairs bedside action with help: open the airway now, support breathing now, and notify anesthesia or activate the emergency pathway when the trend is not promptly corrected. A common trap answer is to chart, obtain more readings, or wait one cycle of vital signs while a desaturating patient deteriorates.

Residual Neuromuscular Blockade and Reversal

Residual paralysis is a frequently tested cause of hypoventilation. After a nondepolarizing paralytic such as rocuronium or vecuronium, incomplete reversal leaves the patient weak, unable to protect the airway, and at risk of progressive hypercarbia. Classic bedside signs are an inability to sustain a 5-second head lift, a weak hand grip, jerky uncoordinated movement, and "rocking" abdominal breathing. The objective measure is a train-of-four (TOF) ratio, where four equal twitches with a ratio at or above 0.9 indicates adequate recovery; fade between twitches signals residual blockade.

Reversal agents differ by mechanism, and the exam expects you to know them. Neostigmine, an acetylcholinesterase inhibitor, must be paired with an antimuscarinic such as glycopyrrolate to blunt bradycardia and secretions. Sugammadex selectively encapsulates rocuronium or vecuronium and reverses even deep blockade rapidly. While reversal takes effect, the nurse keeps the head of the bed elevated, supports ventilation, applies oxygen, prevents falls, and avoids opioids or benzodiazepines that would deepen respiratory depression. Reintubation is the fallback when the airway cannot be protected.

Putting Oxygen Delivery First

Every airway item ultimately tests the same hierarchy: a patent airway, then effective ventilation, then adequate oxygenation, then circulation. When two findings compete, the airway and breathing finding wins. A patient who is hypotensive and apneic still gets the airway opened and ventilation supported before a fluid bolus is hung. Anchor your answer choice to the ABC sequence and the highest-acuity, soonest-lethal threat, and the templated distractors about documentation, fluids, or routine teaching fall away.

Oxygen Delivery Devices and Targets

Match the device to the need. A nasal cannula at 1-6 L/min delivers roughly 24-44% oxygen and suits a stable, mildly hypoxemic patient. A simple mask (6-10 L/min) and a non-rebreather mask with a reservoir (10-15 L/min, up to roughly 90% oxygen) escalate delivery for moderate to severe hypoxemia. A patient who cannot maintain saturation or ventilation on a non-rebreather needs assisted ventilation with a bag-valve-mask and positive pressure, then possibly reintubation.

For most postoperative adults the target SpO2 is about 92-96%; chronic CO2 retainers are titrated more conservatively to avoid blunting hypoxic drive, but acute hypoxemia is always corrected first.

When escalating, do not silently swap devices and walk away; reassess SpO2, work of breathing, and mental status within minutes, and if a higher-flow device does not reverse the trend, treat that as a failure-to-oxygenate trigger for anesthesia and emergency support.