Which symptom might indicate worsening renal function in a client with heart failure?

Decreased urine output is a vital indicator of worsening renal function in patients with heart failure. When the heart's ability to pump blood effectively is compromised, it can lead to decreased perfusion of the kidneys. This decreased blood flow results in reduced filtration and less urine production. Monitoring urine output is crucial in managing heart failure because significant changes can signal that the body's fluid balance is disrupted and that renal function is deteriorating.

In severe cases, inadequate renal function can exacerbate heart failure symptoms, as the retention of fluids can lead to increased blood volume, further stressing the heart. Therefore, recognizing and addressing decreased urine output early can help prevent complications related to both renal and heart function.