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Figure 3 | BMC Nuclear Medicine

Figure 3

From: Variation in heart rate influences the assessment of transient ischemic dilation in myocardial perfusion scintigraphy

Figure 3

Illustrative cases demonstrating how change in heart rate can affect transient ischemic dilation (TID) ratios. (a) Low-risk left ventricular perfusion pattern (equivocal in the posterobasal segment due to possible attenuation artifact) with an elevated TID ratio. Heart rate was slower with stress than with rest imaging (78 BPM and 98 BPM, respectively, with absolute difference -20 BPM). (b) Severely abnormal left ventricular perfusion with a borderline TID ratio. Multiple reversible defects (arrowheads) indicate multivessel ischemia. Heart rate was faster with stress than with rest imaging (75 BPM and 60 BPM, respectively, absolute difference 15 BPM) and the TID ratio was abnormal using a rate stratified normal range.

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