What symptom may indicate worsening heart failure?

Swelling in the legs is a significant symptom that can indicate worsening heart failure. This condition leads to fluid retention in the body due to the heart's impaired ability to pump effectively. As heart failure progresses, pressure builds up in the blood vessels, causing fluid to leak into the surrounding tissues, especially in the lower extremities. This edema is typically more pronounced in the legs and feet, signaling that the heart is struggling to manage the body's demands.

In contrast, increased aerobic capacity and improved tolerance to exercise would generally suggest an improvement in cardiac function, as these would reflect the heart's enhanced ability to deliver oxygen to tissues during physical activity. A decreased respiratory rate might also suggest not only a stable status in heart failure but could signify effective respiratory compensation, further indicating that the patient is not experiencing acute distress.

Understanding these conditions helps in recognizing the clinical signs that may suggest a deterioration in a patient's heart condition, allowing for timely intervention and management.