PT  - JOURNAL ARTICLE
AU  - Noboru Teramoto
AU  - Kazuhiro Koshino
AU  - Ikuo Yokoyama
AU  - Shigeru Miyagawa
AU  - Tsutomu Zeniya
AU  - Yoshiyuki Hirano
AU  - Hajime Fukuda
AU  - Junichiro Enmi
AU  - Yoshiki Sawa
AU  - Juhani Knuuti
AU  - Hidehiro Iida
TI  - Experimental Pig Model of Old Myocardial Infarction with Long Survival Leading to Chronic Left Ventricular Dysfunction and Remodeling as Evaluated by PET
AID  - 10.2967/jnumed.110.084848
DP  - 2011 May 01
TA  - Journal of Nuclear Medicine
PG  - 761--768
VI  - 52
IP  - 5
4099  - http://jnm.snmjournals.org/content/52/5/761.short
4100  - http://jnm.snmjournals.org/content/52/5/761.full
SO  - J Nucl Med2011 May 01; 52
AB  - A pig model of reduced left ventricular (LV) function and remodeling or chronic heart failure with long survival after myocardial infarction (MI) has not been established. The aim of this study was to evaluate the pathophysiologic status of a pig model of old MI using a series of PET studies. Methods: Twenty-seven male farm pigs were divided into 2 groups: 7 animals in the control group and 20 animals that underwent a proximal coronary artery (CA) occlusion using an ameroid constrictor after distal CA ligation. A series of PET examinations was performed to assess LV volumes, LV functions, myocardial perfusion response to adenosine, and viability as water-perfusable tissue index. Results: The distal CA ligation inhibited arrhythmia during and after the operation, and a transmural anteroseptal MI, with an infarction area of 27% ± 5% of the whole left ventricle, was generated with a survival rate of 75% at 4 mo. Wall motion evaluated by 18F-FDG PET was diffusely reduced, including the noninfarcted wall. Global LV ejection fraction as assessed by gated C15O PET was reduced (39% ± 16%) in the group undergoing occlusion, compared with the control group (66% ± 16%, P < 0.05). LV end-systolic (31.4 ± 9.2 cm3) and end-diastolic (52.7 ± 10.2 cm3) volumes were increased, compared with controls (15.2 ± 9.4 cm3, P < 0.01, and 41.7 ± 11.5 cm3, P < 0.05, respectively). Histology showed hypertrophy and development of microscopic fibrosis in noninfarcted myocardium. PET demonstrated the reduced myocardial perfusion response to adenosine and also reduced water-perfusable tissue index in remote segments. Conclusion: The pig model of old MI generated by the chronic proximal CA obstruction after distal ligation was characterized by LV dysfunction and remodeling, with a high survival rate.