- Since aldesleukin will be excluded if they have a history of electrocardio- gram (EKG) abnormalities, symptoms of cardiac ischemia or arrhythmias and have a left ventricular ejection fraction (LVEF) less than 45% on a cardiac stress test (stress thallium, stress multi-gated acquisition scan (MUGA), dobutamine echocardiogram, or other stress test).