Final answer:
Swollen legs are an early sign of left ventricular failure and should be taken seriously if accompanied by other symptoms.
Step-by-step explanation:
Swollen legs are an early sign of left ventricular failure that a patient is most likely to report. When the heart's left ventricle fails to pump blood effectively, fluid can accumulate in the body, leading to swelling in the legs. This condition is known as peripheral edema. Other symptoms of left ventricular failure include difficulty breathing, fatigue, and rapid weight gain. If a patient reports swollen legs along with these symptoms, it is important to seek medical attention.