Restrictive cardiomyopathy results in which of the following?

Restrictive cardiomyopathy is characterized by the stiffening and thickening of the heart muscle, which leads to impaired filling of the ventricles during diastole. As a result, the heart struggles to fill adequately, leading to increased pressures in the heart and the pulmonary circulation.

The dilated atria become a consequence of this impaired filling. When the ventricles cannot accommodate the return blood flow from the atria, it leads to elevated pressures in the atria. Over time, this causes the atria to dilate in response to the increased volume and pressure, consistent with the pathophysiological changes seen in restrictive cardiomyopathy. Additionally, the diastolic dysfunction is a hallmark of this condition, as the heart is unable to relax fully, preventing efficient filling.

The other choices do not align with the pathophysiology of restrictive cardiomyopathy. Increased cardiac output is not typical due to the filling issues caused by the disease. Enhanced ventricular wall compliance contradicts the rigid nature of the cardiomyopathy. A high ejection fraction may be observed in some cases, but the overall heart function is compromised due to the inability of the heart to fill properly, making it less relevant in this context.