A patient experiencing left heart failure is likely to show which of the following echocardiogram findings?

In a patient experiencing left heart failure, one of the primary echocardiographic findings is the elevation of pulmonary venous pressures. Left heart failure occurs when the left ventricle is unable to effectively pump blood out to the body, which leads to a backlog of blood in the left atrium and subsequently in the pulmonary veins. This increased pressure in the pulmonary veins can lead to pulmonary congestion and edema.

In imaging, this can be reflected as an increase in pulmonary venous wedge pressure, which is a significant indicator of left atrial and pulmonary venous pressure elevations. Thus, the echocardiogram findings would show signs consistent with these changes, confirming the diagnosis of left heart failure.

Other aspects such as decreased cardiac output and alterations in ventricular function are often observed, but they do not specifically describe the immediate consequence of left ventricular dysfunction as clearly as the elevation of pulmonary venous pressures does. This makes option B the most relevant and indicative finding related to left heart failure in the context of echocardiography.