Department of Thoracic and Cardiovascular Surgery;
Siren Zhen People's Hospital;
Shen Zhen 518020;
P R China;
Department of Cardiovascular Surgery;
Hokkaido University School of Medicine;
Sapporo 060-0848;
Japan;
Department of Cardiovascular Surgery;
Hokkaido University School of Medicine;
Sapporo 060-0848;
Japanbjectives To assess a newly devised procedure of cardiac volume reduction without resection of cardiac muscle and evaluated in experimental settings. Methods Ten beagle dogs underwent a rapid pacing leading to heart failure for 3 weeks and received the left ventricular reduction termed overlapping cardiac volume reduction operation (OLCVR);
which consisted of a longitudinal incision in left ventricular (LV) free wall;
sutures of the left marginal to the septal wall;
and the right marginal to LV free wall. A slope of the linear preload recruitable stroke work relationship ( Mw);
with a X - intercept (Vo) were calculated as the precise indicators of left ventricular systolic function. The constant of isovolumic pressure decay (Tau) and a peak filling rate (PFR) were also calculated as the indicators of LV diastolic function. Results LV end- diastolic dimensions was significantly reduced by OLCVR (43 ±2 to 25 ±1;
mm). Fractional shortening was significantly improved by OLCVR (11 ±2 to 30±4;
% ). Mw (erg cm~(-3) * 10~3) was also significantly improved (21±2 to 33±3 (p < 0. 001 ) );
whereas Vo;
Tau and PFR did not show significant changes. Conclusions The OLCVR significantly increased in the early LV systolic function without detrimental effects on diastolic function. This procedure may become a therapeutic option for end - stage cardiomyopathy.;