An assessment specific to safe administration of IV mannitol is?

KPSC Staff Nurse - 2016

Pharmacology

Medium

Appeared in: KPSC Staff Nurse - 2016

Explanation

Mannitol is an osmotic diuretic that pulls fluid into the vascular space and relies on the kidneys for excretion.
Hourly urine output is the most specific and immediate assessment to confirm adequate kidney function and prevent life-threatening complications like pulmonary edema from fluid overload.
A target urine output of at least 0.5-1 mL/kg/hour (approximately 30-50 mL/hour in an adult) indicates the drug is being administered safely.
A significant decrease in urine output is a critical finding that requires stopping the infusion and notifying the provider immediately.

Option A: While vital signs are monitored for fluid shifts (e.g., changes in blood pressure), they are a general assessment and not as specific to mannitol's direct renal effect as urine output.
Option B: Daily weight reflects overall fluid balance over a 24-hour period. It is too slow to be the primary safety measure for a potent, rapid-acting diuretic like mannitol.
Option D: Assessing the level of consciousness evaluates the therapeutic effectiveness of mannitol in reducing intracranial pressure, not the safety of its administration.

Clinical Relevance

Nursing practice connection: Use the key finding related to Safe administration and monitoring of osmotic diuretics (Mannitol) to guide bedside assessment, documentation, and the next nursing action.
Nurses must always use an in-line filter for IV mannitol administration because the solution can crystallize at room temperature, and these crystals can cause significant harm if infused.
Before administration, the nurse must inspect the IV bag or bottle for crystals. If crystals are present, the solution must be warmed to dissolve them and then cooled to body temperature before infusion.
What if? If a patient receiving mannitol has a urine output of less than 30 mL/hr for two consecutive hours, the nurse's priority action is to stop the infusion and immediately notify the healthcare provider. This indicates potential acute kidney injury or severe dehydration.

How to Approach the Question

First, identify the keywords in the question: 'specific assessment,' 'safe administration,' and 'IV mannitol.'
Recall the drug class and mechanism of action. Mannitol is an osmotic diuretic, meaning it works by pulling fluid into the blood vessels and promoting its excretion through the kidneys as urine.
Think about the primary safety concern associated with this mechanism. If the kidneys cannot excrete the extra fluid, it will build up in the body, leading to fluid overload and pulmonary edema.
Evaluate each option based on this safety concern:
Vital signs, daily weight, and level of consciousness are all important but are either too general, too slow, or measure the drug's effect rather than its safety.
Hourly urine output directly measures whether the kidneys are successfully excreting the fluid load, making it the most specific and critical safety assessment.

Concept Tested & Keywords

Concept Tested: Safe administration and monitoring of osmotic diuretics (Mannitol).
Stem keywords: IV mannitol, safe administration, assessment
Lead-in keywords: specific to
Negative lead-in flag: false

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E6 Nursing Vital Signs pp. 114-116, 154-156

E6 Nursing Fundamentals Potter Perry 12e Part 5 p. 61-63