A nurse teaches a patient who is at risk for mild hypernatremia. Which statement does the nurse include in this patient's teaching?

A. Diabetic ketoacidosis (DKA) in a person with emphysema:

In DKA, there is typically metabolic acidosis due to the accumulation of ketones in the blood, leading to a decrease in pH. However, the respiratory compensation mechanism in DKA usually results in a decreased PaCO2 (respiratory alkalosis) rather than an elevated PaCO2 as seen in the blood gas values provided. Additionally, emphysema is associated with chronic respiratory acidosis, not respiratory alkalosis as indicated by the elevated PaCO2.

B. Diarrhea for 36 hours in an older, frail woman:

Prolonged diarrhea can lead to metabolic acidosis due to the loss of bicarbonate through the gastrointestinal tract. The pH of 7.12 and the decreased HCO3- (22 mEq/L) suggest metabolic acidosis. However, the elevated PaCO2 (respiratory acidosis) is not consistent with pure metabolic acidosis caused by diarrhea. Respiratory acidosis typically occurs due to hypoventilation or respiratory dysfunction.

C. Anxiety-induced hyperventilation in an adolescent:

Anxiety-induced hyperventilation can lead to respiratory alkalosis due to excessive blowing off of CO2, resulting in a decrease in PaCO2. The pH of 7.12 is consistent with acidosis, but the elevated PaCO2 contradicts respiratory alkalosis. Anxiety-induced hyperventilation would typically result in a higher pH and lower PaCO2.

D. Bronchial obstruction related to aspiration of a hot dog:

A bronchial obstruction causing inadequate ventilation can lead to respiratory acidosis due to CO2 retention. The pH of 7.12 and the elevated PaCO2 (65 mm Hg) indicate respiratory acidosis. This situation is consistent with the blood gas values provided.

A. Smoking causes you to cough frequently, and the wound might get infected by sputum.

While smoking can indeed contribute to respiratory issues like coughing, linking this directly to wound infection by sputum is not the most accurate explanation of how smoking affects wound healing. The primary concern with smoking and wound healing lies in its effects on circulation and tissue oxygenation rather than the risk of infection due to coughing.

B. Nicotine causes vasoconstriction, so your wound might not get enough blood flow to heal.

This is the best response among the options provided. Nicotine, a major component of cigarette smoke, is known to constrict blood vessels (vasoconstriction). This constriction reduces blood flow to the wound site, leading to decreased delivery of oxygen and nutrients necessary for proper wound healing. It addresses the direct physiological impact of smoking on wound healing and provides a clear explanation for the client.

C. Nicotine causes tar to build up in the wound, and it will impair healing.

While nicotine and other components of tobacco smoke can have detrimental effects on healing, particularly through vasoconstriction, the explanation about tar building up in the wound is not entirely accurate. Tar is more associated with lung damage from smoking rather than direct buildup in external wounds. Therefore, this response is less specific and may confuse the client about the actual mechanism of how smoking affects wound healing.

D. Smoking is bad, and you should stop right away.

While this response emphasizes the importance of smoking cessation, it lacks specificity in explaining how smoking impacts wound healing. Providing specific information about vasoconstriction due to nicotine, as mentioned in option B, would be more helpful in helping the client understand the direct effects of smoking on their chronic wound and why cessation is crucial.