You are caring for a patient admitted with chronic obstructive pulmonary disease. During your shift assessment, you find that your patient is experiencing a change in his respiratory and mental status.
You are aware that the most accurate measurement of the concentration of oxygen in the patient's blood is what?

Choice A rationale

Increasing oxygen flow without assessing the client's respiratory status first can be detrimental for a client with COPD. High oxygen concentrations can suppress the hypoxic drive, which is a primary stimulus for breathing in some COPD patients, potentially leading to hypoventilation and respiratory acidosis.

Choice B rationale

While coughing and expectorating secretions can improve airway clearance, it is not the initial priority when a client with COPD reports difficulty breathing. A comprehensive assessment is crucial to determine the underlying cause of dyspnea before implementing interventions that may not be appropriate.

Choice C rationale

Calling emergency services immediately without first assessing the client's respiratory status is premature. The nurse needs to gather more information to determine the severity of the client's condition and whether immediate emergency intervention is warranted, or if other actions can alleviate the distress.

Choice D rationale

Assessing the client's respiratory status is the priority action. This involves evaluating respiratory rate, depth, effort, use of accessory muscles, oxygen saturation (SpO2), and breath sounds. This provides objective data to guide further interventions and determine the severity of the respiratory distress.

Choice A rationale

Having the client identify specific smells assesses the function of the olfactory nerve, which is Cranial Nerve I. This nerve is responsible for the sense of smell and is tested independently of the facial nerve, which governs motor functions of the face and taste sensation.

Choice B rationale

Checking the client's visual acuity using a Snellen chart assesses the optic nerve, Cranial Nerve II. This nerve transmits visual information from the retina to the brain. Its function is distinct from that of Cranial Nerve VII, which controls facial muscle movements and taste.

Choice C rationale

Observing for facial symmetry while the client smiles directly assesses the motor function of Cranial Nerve VII, the facial nerve. This nerve innervates the muscles of facial expression. Asymmetry or weakness indicates potential damage or dysfunction of this specific cranial nerve. Normal range includes symmetrical movement.

Choice D rationale

Whispering in one of the client's ears while occluding the other assesses the vestibulocochlear nerve, Cranial Nerve VIII. This nerve is responsible for hearing and balance. It is not involved in controlling facial expressions or taste sensation, which are functions of Cranial Nerve VII.