Different Aspects of Transient Ischemic Dilation

Transient ischemic left ventricular dilation (TID) is a marker of severe and extensive coronary artery disease as well as an increased risk of adverse outcomes. The patients with more severe and extensive ischemia, multivessel-type of perfusion abnormality as well as patients with left anterior descending artery (LAD) territory perfusion abnormality have more probability of having TID. Evaluation of TID may be purely visual, or based on calculation of TID ratio between stress and rest images. Cutoff values for an abnormal TID ratio vary widely throughout the literature and may be related to different factors like patient populations and imaging protocols. On the other hand, several other causes of TID in the absence of significant epicardial stenoses have been reported. These include severe hypertension with myocardial hypertrophy; hypertrophic cardiomyopathy; and dilated cardiomyopathy.