Cardiac fibrosis and cellular hypertrophy decrease the degree of reverse remodeling and improvement in cardiac function during left ventricular assist
published online 26 February 2010.
Background
This study investigated if the degree of cardiac fibrosis and myocyte size at the time of left ventricular assist device (LVAD) implantation predicts the degree of improvement in cardiac function and sustained recovery after LVAD explantation.
Methods
The study included 34 patients who underwent LVAD-off test. LV end-diastolic (LVEDD) and end-systolic diameter (LVESD), LV ejection fraction (LVEF), mean pulmonary artery pressure (mPAP), pulmonary capillary wedge pressure (PCWP), and cardiac index (CI) were measured before LVAD implantation and during LVAD-off test. Myocardial tissue was obtained from the apical core at LVAD implantation.
Results
The degree of cardiac fibrosis had significant correlations with changes in LVEDD (r = −0.725, p < 0.0001), LVESD (r = −0.800, p < 0.0001), LVEF (r = −0.637, p < 0.0001), mPAP (r = −0.569, p = 0.0010), PCWP (r = −0.463, p = 0.0123), and CI (r = −0.544, p = 0.0015). Myocyte size also had significant correlations with changes in LVEDD (r = −0.386, p = 0.0235), LVESD (r = −0.414, p = 0.0141), and LVEF (r = −0.528, p = 0.0015). The LVAD was successfully removed in 9 patients. The degree of cardiac fibrosis and myocyte size in these patients was significantly smaller compared with the patients who did not undergo LVAD removal.
Conclusions
Cardiac fibrosis and myocyte size at the time of LVAD implantation were significant predictors of degree of improvement of cardiac function and the sustained recovery after the LVAD explantation.
Division of Cardiovascular Surgery, Department of Surgery, Osaka University Graduate School of Medicine, Suita, Osaka, Japan
Reprint requests: Goro Matsumiya, MD, Division of Cardiovascular Surgery, Department of Surgery, Osaka University Graduate School of Medicine (E1), 2-2 Yamada-oka, Suita, Osaka 565-0871, Japan. Telephone: +81-6-6879-3154. Fax: +81-6879-3163
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