[Regional work of the left ventricle before and after CABG].
To evaluate the effects of CABG on regional function of the left ventricular wall, regional work of the left ventricular anterior wall was calculated before and after CABG in 8 patients with multivessel coronary artery disease. In all patients, including CABG for LAD branch, complete revascularization was performed. Regional work of the left ventricular wall was calculated as RW (mJ/cm3) = - integral of sigma d epsilon, where sigma = wall stress and epsilon = regional strain (1n (1/H): H = wall thickness). A major and a minor axis, and anterior wall thickness during cardiac cycle were obtained from the left ventriculogram. Preoperatively, the RW varied widely (from -0.9 to 13.3 mJ/cm3). In 4 cases, the RW decreased and in the other cases, it increased. The RW converged in the tight range (from 2.5 to 6.7 mJ/cm3), postoperatively. These results suggest a uniformalization of the RW in the different regions of the left ventricle was established after the complete revascularization. We conclude that the RW obtained from the analyses of sigma-epsilon relationship is a useful index for evaluating the effects of CABG on the treated region of the left ventricle.
Nakano
K
K
Department of Cardiovascular Surgery, Heart Institute of Japan, Tokyo Women's Medical College.
Nakatani
H
H
Endo
M
M
Magosaki
N
N
Tamura
K
K
Sugawara
M
M
Koyanagi
H
H
D000009:Abdominal Muscles / Q000098:blood supply; D000368:Aged; D001158:Arteries / Q000637:transplantation; D002306:Cardiac Volume; D001026:Coronary Artery Bypass / Q000379:methods*; D003327:Coronary Disease / Q000503:physiopathology / Q000601:surgery; D006801:Humans; D008297:Male; D008875:Middle Aged; D009200:Myocardial Contraction; D012501:Saphenous Vein / Q000637:transplantation; D013895:Thoracic Arteries / Q000637:transplantation; D014022:Tissue Survival; D016277:Ventricular Function, Left