Jennifer Lopez, who had undergone surgery in the post-anesthesia care unit (PACU), is difficult to arouse two hours following surgery.

The PACU RN had been administering Morphine Sulfate intravenously to the client for complaints of post-surgical pain.

The client's respiratory rate is now 7 per minute and demonstrates shallow breathing.

The patient does not respond to any stimuli.

The nurse assesses the ABCs (remember Airway, Breathing, Circulation!) and obtains ABGs STAT! Measurement of arterial blood gas shows pH 7.10, PaC02 70 mm Hg, and HCO3 24 mEq/L. What does this mean?

Choice A rationale

Bradycardia, a slow heart rate (typically below 60 beats per minute in adults), is a key component of Cushing's triad. It results from the body's compensatory response to increased intracranial pressure, where systemic hypertension triggers a reflex vagal response, leading to a decrease in heart rate.

Choice B rationale

Widening pulse pressure, defined as an increasing difference between systolic and diastolic blood pressure, is a hallmark of Cushing's triad. This occurs as the body attempts to maintain cerebral perfusion pressure by increasing systolic pressure against a relatively stable or slightly decreased diastolic pressure due to peripheral vasodilation.

Choice C rationale

Hypertension, specifically systolic hypertension, is a crucial component of Cushing's triad. It reflects the body's physiological attempt to overcome increased intracranial pressure and maintain adequate cerebral blood flow by increasing systemic arterial pressure, ensuring perfusion to the brain.

Choice D rationale

Hypothermia, a core body temperature below 35°C (95°F), is not a recognized component of Cushing's triad. Cushing's triad specifically describes a set of physiological responses to increased intracranial pressure: bradycardia, hypertension, and widening pulse pressure, all related to cardiovascular and respiratory regulation.

Choice A rationale

Patient self-extubation would typically trigger a low-pressure alarm, not a high-pressure alarm, because the ventilator circuit would no longer be connected to the patient's airway, resulting in a sudden drop in airway pressure and a loss of positive pressure ventilation.

Choice B rationale

Disconnection of the tubes, similar to self-extubation, would lead to a low-pressure alarm due to the loss of a closed circuit. The ventilator would detect a rapid decrease in pressure within the system as air escapes, indicating a leak or complete disconnection.

Choice C rationale

Tube displacement, particularly if the endotracheal tube is pushed deeper into the bronchus or becomes kinked, increases airway resistance. This heightened resistance requires the ventilator to exert more pressure to deliver the set tidal volume, thus triggering a high-pressure alarm.

Choice D rationale

The patient biting the endotracheal (ET) tube creates an occlusion within the airway, significantly increasing airway resistance. This increased resistance makes it harder for the ventilator to deliver breaths, leading to a rapid rise in peak inspiratory pressure and activating the high-pressure alarm.