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Citation:
Morgan M, Bell D, Lall N, et al. Transient ischemic dilatation. Reference article, Radiopaedia.org (Accessed on 18 Apr 2024) https://doi.org/10.53347/rID-31807
Transient ischemic dilatation (TID) is a paradoxical phenomenon seen in myocardial perfusion SPECT imaging.
With severe balanced coronary artery disease, myocardial ischemia may result in apparent enlargement of the left ventricular cavity during stress. The cause of this is not entirely clear, but some speculate that it may be (at least partly) due to extensive subendocardial ischemia.
The TID ratio is the stress volume : rest volume. Abnormally elevated TID ratio has been defined with abnormal cut-off values ranging from 1.12-1.22 2.
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1. Abidov A, Berman DS. Transient ischemic dilation associated with poststress myocardial stunning of the left ventricle in vasodilator stress myocardial perfusion SPECT: true marker of severe ischemia?. J Nucl Cardiol. 2005;12 (3): 258-60. Pubmed citation
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2. McLaughlin MG, Danias PG. Transient ischemic dilation: a powerful diagnostic and prognostic finding of stress myocardial perfusion imaging. J Nucl Cardiol. 2002;9 (6): 663-7. doi:10.1067/mnc.2002.124979 - Pubmed citation
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3. Halligan WT, Morris PB, Schoepf UJ, Mischen BT, Spearman JV, Spears JR, Blanke P, Cho YJ, Silverman JR, Chiaramida SA, Ebersberger U. Transient Ischemic Dilation of the Left Ventricle on SPECT: Correlation with Findings at Coronary CT Angiography. Journal of nuclear medicine : official publication, Society of Nuclear Medicine. 55 (6): 917-22. doi:10.2967/jnumed.113.125880 - Pubmed
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