 I. Inability to lie flat. J. Atrial fibrillation or uncontrolled tachyarrhythmia, or advanced atrioventricular block second or third degree heart block K. Elevated serum creatinine 1.5mgdl OR calculated creatinine clearance of 60 mlmin using the Cockcroft-Gault formula L. History of contrast-induced nephropathy M. Severe pulmonary disease or other disorder that does not allow patient to hold breath for 10 seconds or more. 