What is the recommended action for a client experiencing 3+ pitting edema due to heart failure?

In cases of heart failure, fluid retention often leads to symptoms such as 3+ pitting edema, which indicates significant fluid accumulation in the tissues. Administering a loop diuretic is the appropriate action as it promotes renal excretion of sodium and water, which helps reduce the excessive fluid burden on the body. This can alleviate the symptoms associated with heart failure, including peripheral edema, and ultimately improve the client's overall condition and comfort.

Using diuretics like furosemide (a common loop diuretic) can quickly address fluid overload, which is a central concern in heart failure management. Monitoring the client's response to the medication, including changes in weight and edema, is also essential to ensure effective treatment and avoid complications like electrolyte imbalances.

This choice focuses directly on managing the underlying issue of fluid overload rather than addressing symptoms or unrelated complaints, making it the best action in this scenario.