Hypervolemia can result because of all of the following except?

GMCH Chandigarh - 2022

Medical & Surgical Nursing

Medium

Appeared in: GMCH Chandigarh - 2022

Explanation

The question requires identifying the option that is NOT a cause of hypervolemia.
Hypervolemia is a fluid volume excess, characterized by the retention of both sodium and water.
Diarrhoea involves the significant loss of fluid and electrolytes from the gastrointestinal tract.
This fluid loss leads to hypovolemia (fluid volume deficit), which is the opposite of hypervolemia.
Therefore, diarrhoea is the correct answer as it is the exception among the given options.

Option A: Early renal failure is a cause of hypervolemia. When the kidneys fail, their ability to filter blood and excrete waste products, including excess sodium and water, is diminished. This leads to fluid accumulation in the body.
Option B: Congestive heart failure (CHF) is a common cause of hypervolemia. The weakened heart muscle cannot pump blood effectively, leading to decreased blood flow to the kidneys. This triggers the renin-angiotensin-aldosterone system (RAAS), causing the body to retain sodium and water.
Option D: Excessive sodium ingestion directly leads to hypervolemia. The principle 'water follows salt' applies here. When there is an excess of sodium in the extracellular fluid, the body retains water to dilute the sodium and maintain isotonicity, resulting in an expanded fluid volume.

Visual 1: Diagram - A comparative chart showing the signs and symptoms of hypervolemia (e.g., edema, jugular vein distention, crackles in lungs, weight gain) versus hypovolemia (e.g., poor skin turgor, dry mucous membranes, tachycardia, weight loss). This helps visually differentiate the two conditions.
Visual 2: Flowchart - A flowchart illustrating the pathophysiology of congestive heart failure leading to hypervolemia, showing the sequence from decreased cardiac output to RAAS activation and subsequent sodium/water retention.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Causes of Hypervolemia (Fluid Volume Excess) as background academic context rather than a clinical decision trigger.
Nurses must be able to distinguish between hypervolemia and hypovolemia as the treatments are opposite and incorrect management can be life-threatening.
Key nursing interventions for hypervolemia include strict intake and output monitoring, daily weights, fluid and sodium restriction, administering diuretics as prescribed, and assessing for signs of pulmonary edema (e.g., crackles, shortness of breath).
Patient education is crucial, focusing on dietary sodium restrictions, recognizing symptoms of fluid overload, and the importance of daily weight monitoring at home.

How to Approach the Question

First, identify the key concept in the stem: 'Hypervolemia'. Understand its definition as fluid volume excess.
Note the negative lead-in word 'except'. This means you are looking for the option that does NOT cause hypervolemia.
Evaluate each option's effect on the body's fluid balance.
Option A (Renal failure): Kidneys can't excrete fluid -> fluid excess (hypervolemia).
Option B (Heart failure): Body retains fluid due to hormonal changes -> fluid excess (hypervolemia).
Option C (Diarrhoea): Body loses large amounts of fluid -> fluid deficit (hypovolemia).

Concept Tested & Keywords

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