NCLEX · Fluid and Electrolyte Imbalances

A client with heart failure has gained 4 lbs in 2 days and reports increased ankle swelling. How should the nurse interpret this?

Correct answer

Significant fluid retention — 1 kg of weight gain = approximately 1 liter of fluid retention; 4 lbs ≈ 2 liters of fluid; in a heart failure patient, this indicates worsening fluid volume excess requiring prompt assessment and notification of the provider for medication adjustment

  1. A Normal fluctuation requiring no action
  2. B The client is gaining muscle mass
  3. C Significant fluid retention — 1 kg of weight gain = approximately 1 liter of fluid retention; 4 lbs ≈ 2 liters of fluid; in a heart failure patient, this indicates worsening fluid volume excess requiring prompt assessment and notification of the provider for medication adjustment
  4. D Only concerning if the client reports difficulty breathing

Why this is the answer

Fluid weight monitoring in heart failure:

Calculation: 1 kg = 1,000 mL of fluid; 1 lb ≈ 0.45 kg; 4 lbs ≈ 1.8 kg ≈ 1.8 liters of additional fluid.

Heart failure alert weight: Standard patient teaching: notify provider for weight gain of 2+ lbs in a day or 5+ lbs in a week; this patient has gained 4 lbs in 2 days — exceeds the alert threshold.

Assessment: Assess respiratory status (crackles, dyspnea, orthopnea — fluid moving to the lungs?); assess peripheral edema severity; review current medications (diuretics compliance?); check recent sodium intake.

Provider notification: This finding requires prompt provider communication; likely response: increase diuretic dose (furosemide adjustment); sodium restriction reinforcement; possibly additional monitoring or hospitalization if respiratory symptoms present.

Pn scope: Assess, document, notify RN/provider, implement ordered changes; daily weights are the most sensitive early indicator of fluid status changes.

Source: NCLEX-PN Test Plan: Physiological — Fluid Balance, Heart Failure Weight Monitoring

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About this topic: Fluid and Electrolyte Imbalances

Fluid and electrolyte questions cover normal ranges for sodium, potassium, calcium and magnesium, the signs of each imbalance, and the nursing actions and client teaching for dehydration and fluid overload. This is one of 9 PN: Physiological Integrity questions on fluid and electrolyte imbalances, each with a full explanation on a single study page.

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