Mechanism of Luminal Enlargement in PTCA and Restenosis : A Histopathological Study of Necropsied Coronary Arteries Collected from Various Centers in Japan : 50th Annual Scientific Session of the Japanese Circulation Society

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Necropsy studies of coronary arteries were made in 14 patients who died after percutaneous transluminal coronary angioplasty (PTCA). Eight patients died shortly after PTCA, while the other six patients died some considerable time later. A total of 9,920 serial step sections of necropsied coronary arteries at the site of PTCA were prepared and examined histopathologically by light microscope to determine the mechanism of luminal enlargement in PTCA, as well as the occurrence of restenosis. Of the eight patients who died shortly after PTCA, two had disruption of the intima and the media in the arterial wall located opposite the site that had atheroma, in spite of the fact that the former wall is more normal than the latter. Dissection of the media was camed out in four patients and intimal desquamation performed in six. All the patients revealed fresh thrombus formation. Of the six patients who survived for a longtime after PTCA was performed, two had disruption of the intima and the media located opposite the site with atheroma. In one, the media was dissected and in another, intimal desquamation was camed out. In one patient, release of atheroma into the lumen was suspected. Proliferation of intimal cells was revered in three patients indicating that restenosis had occurred. No compression of the atheroma was observed in any of the 14 patients. The above findings led to the conclusion that the mechanisms of luminal enlargement in PTCA are 1) intimal and medial disruption in the arterial wall located opposite the atheroma; 2) medial dissection; 3) intimal desquamation; 4) release of atheroma into the lumen; and 5) any combination of 1) - 4). With regard to restenosis, all patients in our study revealed fresh thrombus formation, which suggests the early occurrence of restenosis after PTCA. Three of the six patients who survived long after PTCA showed proliferation of intimal cells. This suggests the possibility that even if the stenosed artery were dilated by PTCA, stenosis may have again occurred as a result of excessive proliferation of intimal cells repairing arterial lesions.
社団法人日本循環器学会の論文
1987-09-20

Mechanism of Luminal Enlargement in PTCA and Restenosis : A Histopathological Study of Necropsied Coronary Arteries Collected from Various Centers in Japan : 50th Annual Scientific Session of the Japanese Circulation Society

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