Patients with valvular heart disease, particularly aortic and mitral incompetence, may have significant derangement of myocardial function, often in the absence of significant symptoms, which directly affects early and late survival and functional status following valve replacement. With declining hospital mortiality rates and improved valvular prostheses, consideration must be given to valve replacement in patients of this type in order to preserve myocardial function. This should improve long-term survival and the functional results following valve replacement. Attention should be directed to identifying and closely observing patients of this type, perhaps with noninvasive techniques, and proceeding with valve replacement before irreversible myocardial damage has occured.