Circulation, Vol 76, 786-791, Copyright © 1987 by American Heart Association
RI Rubinstein, AD Askenase, D Thickman, MS Feldman, JB Agarwal and RH Helfant
To assess the efficacy of magnetic resonance (MR) imaging in evaluating
graft patency after coronary bypass surgery, 20 patients who had prior
surgery (average 5.5 years, range 1.5 to 14) and recent cardiac
catheterization because of chest pain were studied. No patient had surgical
intervention or change in symptoms in the time interval between
catheterization and MR imaging. These 20 patients had a total of 47 grafts,
defined as proximal anastomoses: 20 to the left anterior descending or
diagonal artery (LAD), 13 to the left circumflex artery marginal branches
(LCX), and 14 to the right coronary artery or posterior descending artery
(RCA). The patients underwent cardiac and respiratory gated MR scans in a
0.5 tesla magnet with an echo time of 22 msec and two repetitions in a 128
X 256 matrix. In-plane resolution was 2.7 mm. Every patient had a scan in
the transaxial plane and some underwent scanning in the sagittal and
coronal planes as well. A graft was considered patent by MR when a
signal-free lumen was visualized in an anatomic position consistent with
that of a bypass graft, had a lumen larger than the native vessels, was
seen on more than one slice, and was seen at a level higher than that of
the native vessels. If a known graft was not seen it was considered
occluded. The scans were interpreted by consensus of two physicians aware
of the operative but not the cardiac catheterization data.(ABSTRACT
TRUNCATED AT 250 WORDS)
ARTICLES
Magnetic resonance imaging to evaluate patency of aortocoronary bypass grafts
Philadelphia Heart Institute, Division of Cardiology, Presbyterian- University of Pennsylvania Medical Center 19104.
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