Angiogenic therapy of acute myocardial infarction by intrapericardial injection of basic fibroblast growth factor and heparin sulfate: An experimental study

To examine whether angiogenesis and myocardial salvage occur, 30 μg basic fibroblast growth factor (bFGF) and 3 mg heparin sulfate (HS) were injected through the right atrium into the pericardial cavity by a thin needle-tipped catheter in a canine model of acute myocardial infarction. One month later infarcted weight/left ventricle weight was 24% ± 5.2%, 25% ± 4.0%, 18% ± 2.4%, and 10% ± 1.8% (mean + SE) in saline solution, HS, bFGF alone, and bFGF plus HS groups, respectively. Vascular number in the infarcted area of the outer layer was 13 ± 3.3, 20 ± 2.2, 47 ± 8.3, and 136 ± 26.3200× 200 μm2 in saline solution, HS, bFGF alone, and bFGF plus HS groups, respectively. Thus the vascular number was the largest in the bFGF plus HS group. The vascular number was larger in the subepicardial than in the subendocardial infarcted areas. Vessels directed from the epicardium toward the subepicardial infarcted area were also observed. The transcatheter intrapericardial injection of bFGF plus HS caused angiogenesis and myocardial salvage. This method might bring about a selective therapeutic and preventive modality of myocardial infarction irrespective of coronary anatomy and contraindications for coronary interventions and surgery.