Abstract
Objectives: Transient ischemic dilation ratio (TID) of the left ventricle is a significant predictor of future cardiac events in patients with otherwise normal myocardial perfusion SPECT. TID is a marker for subendocardial perfusion reduction after exercise in gated SPECT studies. Increased TID is correlated with concentric or excentric left-ventricular hypertrophy, or increased pre- or afterload conditions. This parameter is suggested to be an indicator for deterioration of subendocardial perfusion and offers a more precise presumptive screening for myocardial dysfunction.
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