['To investigate the early natural course of dissection after PTCA and its relation to early luminal deterioration.', 'One hundred and five patients who underwent relook coronary arteriography within 24 hours of PTCA were retrospectively analyzed. The patients were subdivided into no dissection and type A, B, C, D, and E dissection. Minimal luminal diameter (MLD) was measured immediately after PTCA and at relook coronary arteriography. The changes were correlated with the severity of the dissections.', "Immediately after PTCA, the MLD in all 6 groups was > 2.0 mm. Except for type A dissection, the MLD, however, was deteriorated significantly at the relook coronary arteriography next day. The factors contributing to the deterioration were analyzed by covariance analysis, which showed a significant linear relation with the MLD immediately after PTCA and the type of dissection. Multivariate stepwise regression analysis was used to investigate if the patients' demographic factors and coronary lesion characteristics were also related to the MLD deterioration. The results showed that multivessel disease and the type of dissection were two independent risk factors of the MLD deterioration."] Is [ Major dissection after PTCA a strong independent predictor of early luminal deterioration ]?