Which of the following are the PRIMARY muscles of respiration? (Select All that Apply.)

A. I: Cranial nerve I, the olfactory nerve, is responsible for the sense of smell and is not involved in visual acuity; it can be tested by asking the patient to identify familiar scents.

B. II: Cranial nerve II, the optic nerve, is responsible for transmitting visual information from the retina to the brain. It is directly involved in measuring visual acuity, as it enables the nurse to assess how well the patient can see and interpret visual stimuli; visual acuity is commonly tested using the Snellen chart.

C. IV: Cranial nerve IV, the trochlear nerve, controls the superior oblique muscle, which is responsible for downward and lateral eye movement. It can be assessed by having the patient follow an object in a downward diagonal direction.

D. III: Cranial nerve III, the oculomotor nerve, controls most of the eye's movements, including constriction of the pupil and maintaining an open eyelid. It is assessed by evaluating the patient's ability to follow objects in all directions and checking for pupil response to light and accommodation.

A. Bradypnea: Characterized by a regular but abnormally slow respiratory rate, typically fewer than 12 breaths per minute in adults. While the patient’s respiratory rate is 12, the irregular pattern and shallow depth suggest a different pattern rather than simple bradypnea.

B. Agonal respirations: Marked by gasping, labored breaths often seen in severe hypoxia or nearing death. This pattern is typically irregular and associated with brainstem dysfunction, which is not described in this case.

C. Chronic obstructive breathing: Seen in patients with COPD, involving prolonged expiration due to airway obstruction. The patient’s case does not mention an obstructive pattern but rather shallow and irregular respirations.

D. Hypoventilation: Defined by shallow, irregular breathing that leads to inadequate alveolar ventilation, commonly caused by drug overdose, particularly opioids or sedatives. The patient’s presentation of shallow and irregular respirations fits this pattern.