I have the same diagnosis - blood clot in apex of left ventricle. Of course, the first thing the cardiologist ordered - after putting me on warfarin - was a thallium chemical stress. After having had two MIs - this thallium stess test produced absolutely nothing new as to my blood clot condition. At the last office visit, the cardiologist informed me that he would check the clot status with an echocardiogram after nine (9) months - if I'm still alive at that time. Oh yes, the cardiologist took me off Plavix fifteen (15) months before the blood clot diagnosis!?!?
Have you had another echocardiogram to see if the clot has reduced?