Abstract |
Tc-99m myocardial perfusion agents such as Tc-99m
sestamibi or Tc-99m tetrofosmin has advantages over T1-
201 for myocardial perfusion scan such as low
attenuation and easy availability. However, Tc-99m
agents do not redistribute so they need to be given 2
times, namely after stress and at rest. To evaluate
whether rest image is needed in patients showing normal
stress images, 43 patients who underwent both
myocardial perfusion scan and coronary angiography and
showed normal stress images were evaluated. Findings of
rest images of them were evaluated whether they change
the diagnosis or treatment plans. Among 43 patients who
showed normal stress myocardial perfusion imaging, 31
(72.1%) showed no additional informations. However,
among 5 patients with vasospastic angina 4(80%) showed
abnormal rest images in spite of normal stress images.
So, when vasospastic angina is suspected clinically,
rest image could be helpful identifying patients with
coronary vasospasm. In conclusion, rest myocardial
perfusion images were not helpful in 72.1 % of patients
with angina when stress images were normal. In only
exception was those with vasospastic angina. |