The nurse suspects which cause of increased bubbling in the water seal chamber of a patient's chest drainage unit?

A. "You need the stool softener because it will be hard to defecate while you remain in bed.": This is not the most appropriate response. While immobility can make bowel movements more difficult, the primary concern following pituitary surgery is the avoidance of straining due to the potential for increased intracranial pressure (ICP). The emphasis should be on avoiding pressure on the surgical site rather than general difficulties from immobility.
B. "Any manipulation of the pituitary gland can cause difficulty in defecation, so stool softeners are important after your surgery.": This is misleading. While pituitary surgery may influence certain bodily functions, the most critical concern is preventing straining to avoid raising ICP. The focus should be on explaining the rationale for avoiding pressure on the surgical site.
C. "It is important you do not strain during bowel movements because this could result in increased pressure on your surgical site.": This is the correct response. Straining during bowel movements can increase ICP, which could potentially compromise healing or lead to complications after pituitary surgery. This explanation directly addresses the patient's safety and emphasizes the need for stool softeners to prevent straining.
D. "You can choose not to take the stool softener if you feel you do not need it.": This response is inappropriate because it does not emphasize the importance of preventing straining, which is a critical consideration after pituitary surgery. The nurse should provide education on the necessity of the stool softener to avoid complications rather than leaving the decision solely to the patient.

A. Blood glucose levels are not directly affected by desmopressin, as it is used to treat diabetes insipidus, which is related to antidiuretic hormone (ADH) deficiency, not glucose metabolism.
B. A serum sodium level of 146 mEq/L is slightly elevated and may indicate dehydration, which is common in diabetes insipidus if not well controlled. Desmopressin should help lower the sodium level by reducing the excessive urine output.
C. Blood urea nitrogen (BUN) is typically used to assess kidney function and hydration status, but it is not a primary indicator of the effectiveness of desmopressin in treating diabetes insipidus.
D. A urine specific gravity of 1.015 is within the normal range and indicates more concentrated urine, which is a therapeutic effect of desmopressin. The medication helps the kidneys retain water, leading to more concentrated urine, and improving symptoms of diabetes insipidus.