Feasibility of adjusting paced left ventricular activation by manipulating stimulus strength.

interventional MRI is warranted. Preoperatively, MRI allowed noninvasive assessment of cardiovascular anatomy and function. During and after implantation, the position of the prosthetic valve was easy to determine. Besides this morphologic information, MRI provided immediate postintervention physiologic parameters of cardiac function and perfusion of the proximal course of the coronary arteries. In addition, VEC MRI demonstrated optimal function of the implanted prosthetic valve in five cases and mild central valvular insufficiency in two cases. In conclusion, the results of this study imply that MRI is a promising tool for transcatheter placement of valved stents. However, further validation of safety aspects is needed in chronic studies with larger numbers of animals.