A nurse is caring for a client who has diabetes insipidus and is receiving desmopressin by intermittent IV bolus. Which of the following manifestations should the nurse identify as an indication of a therapeutic response to the medication?

C. Mannitol is often used to reduce intraocular pressure in conditions such as acute glaucoma or before ophthalmic surgery. It works by creating an osmotic gradient that draws fluid out of the eye, reducing pressure and protecting optic nerve function.

A Deep-vein thrombosis requires anticoagulation therapy to prevent clot propagation and embolization, not osmotic diuretics like mannitol.

B. Heart failure management focuses on improving cardiac function and relieving symptoms such as fluid overload through medications like diuretics (e.g., furosemide), ACE inhibitors, and beta-blockers, not osmotic diuretics like mannitol.

D. Mannitol is used to reduce intracranial pressure in conditions such as traumatic brain injury, intracranial hemorrhage, or brain tumors. By increasing serum osmolality, mannitol draws water out of brain tissue, reducing cerebral edema and intracranial pressure. However, it is important to note that mannitol should not be used in cases of active intracranial bleeding except during craniotomy.

C. Dehydration often leads to dryness of oral mucous membranes due to decreased saliva production. Improved hydration status should lead to moist oral mucous membranes as the client's fluid balance is restored. This is a positive sign that fluid replacement therapy is effective and the client's hydration status is improving.

A. In a dehydrated client, low fluid volume can lead to hypotension (low blood pressure). Effective IV fluid replacement should improve circulating blood volume and subsequently normalize blood pressure. Decreased blood pressure would indicate that the client's condition is improving with adequate fluid replacement. However, this is not always a definitive indicator on its own as other factors can influence blood pressure.

B. An increased heart rate may initially be observed in a dehydrated client. However, as fluid replacement corrects the volume deficit, the heart rate should normalize or decrease to baseline levels. Therefore, a decrease in heart rate would actually indicate effective treatment.

D. Thirst is a symptom of dehydration where the body signals a need for fluids. Effective IV fluid replacement should address the underlying cause of thirst by restoring fluid balance. Therefore, a decrease in excessive thirst would indicate that the client's hydration needs are being met adequately.