RT Journal Article SR Electronic T1 Myocardial 11C-Diacylglycerol Accumulation and Left Ventricular Remodeling in Patients After Myocardial Infarction JF Journal of Nuclear Medicine JO J Nucl Med FD Society of Nuclear Medicine SP 553 OP 559 VO 46 IS 4 A1 Otani, Hiroki A1 Kagaya, Yutaka A1 Imahori, Yoshio A1 Yasuda, Satoshi A1 Fujii, Ryo A1 Chida, Masanobu A1 Namiuchi, Shigeto A1 Takeda, Morihiko A1 Sakuma, Masahito A1 Watanabe, Jun A1 Ido, Tatsuo A1 Nonogi, Hiroshi A1 Shirato, Kunio YR 2005 UL http://jnm.snmjournals.org/content/46/4/553.abstract AB Left ventricular (LV) remodeling after myocardial infarction (MI) is a maladaptive process that increases the risk of heart failure and death. The myocardial phosphoinositide cycle, which is located downstream from several neurohumoral factors, plays a crucial role in LV remodeling. Our animal studies demonstrated that 1-[1-11C]butyryl-2-palmitoyl-rac-glycerol (11C-DAG) can be used to visualize regions with an activated phosphoinositide cycle. Therefore, we examined whether myocardial 11C-DAG accumulation assessed by PET is relevant to LV enlargement and systolic dysfunction in post-MI patients. Methods: We performed PET with 11C-DAG in 13 post-anteroseptal MI patients and 4 healthy volunteers. We placed regions of interest on the noninfarcted myocardium and calculated the myocardium-to-left atrial (LA) chamber ratio of 11C-DAG accumulation. Results: The myocardium-to-LA chamber ratio of 11C-DAG was significantly higher in the post-MI patients (mean ± SD, 1.73 ± 0.35) compared with that of the healthy volunteers (mean ± SD, 1.25 ± 0.13; P < 0.05). In the post-MI patients, the myocardium-to-LA chamber ratio of 11C-DAG was significantly correlated with the LV end-diastolic volume index (r = 0.79, P < 0.01) and the plasma concentration of brain natriuretic peptide (r = 0.85, P < 0.001) and negatively correlated with the LV ejection fraction (r = −0.69, P < 0.01). Conclusion: These findings suggest that the myocardial 11C-DAG accumulation assessed by PET is relevant to LV enlargement, LV systolic dysfunction, and humoral activation in post-MI patients. This new imaging strategy based on intracellular signaling may contribute to the assessment and treatment of post-MI patients.