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Changes in the plasma adenosine concentration and the effects on left ventricular (LV) function and remodeling in patients with acute myocardial infarction (AMI) remain unclear. Methods and Results: In 58 patients with AMI and 14 subjects without cardiac disease (controls), we measured the plasma adenosine concentration by LC-MS/MS. Blood samples were taken from the antecubital vein on days 0, 1, 7, and 14 after AMI, and from the controls on admission. Cardiac echocardiography was performed in the acute (within 7 days) and chronic (6 months) phases of AMI. There were no significant differences in the plasma adenosine concentrations among days 0 (211.5±150.2 nmol/L), 1 (192.7±141.3 nmol/L), 7 (218.8±154.1 nmol/L), and the controls (136.0±50.9 nmol/L). The plasma adenosine concentration increased significantly on day 14 (321.1±195.4 nmol/L) after AMI as compared with days 0, 1 and 7. AMI patients with a greater increase in the plasma adenosine concentration in the subacute phase showed an attenuation of LV dilation in the chronic phase. The plasma adenosine concentration in the acute phase did not affect the LV ejection fraction in the chronic phase.

circulation journal

Increased Plasma Adenosine Concentration in the Subacute Phase May Contribute to Attenuation of Left Ventricular Dilation in the Chronic Phase in Patients With Acute Myocardial Infarction