Summary: Multidetector computed tomography (MDCT) is a better way to measure annular size in patients with aortic stenosis who are candidates for transcatheter aortic valve implantation (TAVI) than 2-dimensional (2D) echocardiography, a new study indicates.
19, 2013 – Multidetector
computed tomography (MDCT)
is a better way to measure annular size in patients with aortic stenosis who
are candidates for transcatheter aortic valve implantation (TAVI) than 2-dimensional
(2D) echocardiography, a new study indicates.
study included 69 patients who underwent an MDCT scan as well as transthoracic
and transesophageal echocardiography before having a TAVI, said Dr. Vineeta
Sethi, lead author of the study. TAVI is done to treat patients with severe
aortic stenosis who are not surgical candidates. Aortic stenosis is a common disorder in the
of the aortic annulus is crucial for implant size selection and procedure
success,” said Dr. Sethi. “If the
implanted valve is too small, blood will leak outside of the valve apparatus
back into the heart.”
obtained on MDCT
were significantly different than those obtained on echocardiography. “The decision to use a certain valve size
would have been changed in about 55% of patients in our study if MDCT
measurements had been used rather than echocardiography measurements,” she
said. “This includes patients who were
wrongly sized as well as those who would have been disqualified from having
TAVI due to the large size of their aortic annulus,” she added.
stated that transesophagea/transthoracic echocardiographically derived
measurements of the aortic annulus are the current standard for measurement but
with the increasing awareness of the discrepancies in measurement between MDCT
and echocardiography, more people are using MDCT derived measurements to choose
appropriate valve size.
will be part of the electronic exhibit program at the ARRS Annual Meeting in
information: ARRS Annual Meeting and www.appliedradiology.com