A patient presents to the emergency department with a complaint of watery diarrhea for the past three days. Assessment findings include blood pressure - 100/60, pulse - 98, and dry mucous membranes. The healthcare provider would anticipate intravenous therapy administration with which of the following fluids?

Appeared in: BHU NO-2019

Explanation

The patient's symptoms of watery diarrhea, low blood pressure, high pulse rate, and dry mucous membranes are classic signs of fluid volume deficit (hypovolemia).
Isotonic crystalloids (e.g., 0.9% Normal Saline, Lactated Ringer's) are the first-line choice for treating hypovolemia because their concentration is similar to that of blood plasma.
These fluids expand the intravascular volume to restore blood pressure and tissue perfusion without causing significant shifts of fluid between the blood vessels and the body's cells.

Option B: Hypertonic solutions pull fluid out of the cells and into the bloodstream. This would worsen the patient's cellular dehydration, even though it would raise blood pressure.
Option C: Hypotonic solutions cause fluid to move from the bloodstream into the cells. This would further lower the patient's already low blood pressure and worsen the hypovolemic state.
Option D: Colloid solutions contain large molecules that are very effective at expanding blood volume, but they are not the first-line treatment for dehydration from diarrhea.

Clinical Relevance

Nursing practice connection: Prioritize focused assessment, early escalation, and real-time monitoring when managing Intravenous Fluid Therapy for Hypovolemia in acute care settings.
Nurses are responsible for administering IV fluids and must vigilantly monitor the patient's response, including vital signs, urine output, and for signs of fluid overload (e.g., crackles in the lungs, edema).
Prompt recognition and treatment of hypovolemia are critical nursing functions to prevent the patient's condition from deteriorating into hypovolemic shock, a life-threatening emergency.
What if? If the patient's primary problem was not dehydration but cerebral edema (swelling of the brain), the correct answer would be a hypertonic crystalloid. This is because a hypertonic solution would be needed to draw excess fluid out of the brain cells and reduce intracranial pressure.

How to Approach the Question

First, analyze the patient's clinical data provided in the question: a history of fluid loss (diarrhea) combined with signs of dehydration (low BP, high pulse, dry mucous membranes).
Identify the core physiological problem. In this case, it is fluid volume deficit, also known as hypovolemia.
Determine the primary goal of treatment. The immediate goal is to restore the circulating blood volume to stabilize the patient's blood pressure and heart rate.
Evaluate each option based on its mechanism of action. Consider how each fluid type (isotonic, hypertonic, hypotonic, colloid) affects the movement of water between the body's fluid compartments.
Select the fluid that achieves the treatment goal most safely and effectively. Isotonic solutions expand the intravascular space without causing harmful fluid shifts, making them the standard choice for initial resuscitation in hypovolemia.

Concept Tested & Keywords

Concept Tested: Intravenous Fluid Therapy for Hypovolemia
Stem keywords: watery diarrhea, blood pressure - 100/60, pulse - 98, dry mucous membranes, intravenous therapy
Lead-in keywords: anticipate, which of the following fluids
Clinical cues: The combination of watery diarrhea (fluid loss) with signs of dehydration (hypotension, tachycardia, dry mucous membranes) points directly to hypovolemia.

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E6 Nursing Brunner Adult Health 3SA Vol 1 Part 1 p. 142-144

E6 Nursing Fundamentals Potter Perry 12e Part 5 p. 68-70

Practise the full BHU NO-2019

Attempt every question from this paper in a timed mock, then review the full solution for each one.