Abstracts of Papers to Be Presented at the 35th Annual Scientific Session of the American College of Cardiology, Atlanta, Georgia, March 9–13, 1986
Journal of the American College of Cardiology
lA This year, 2,985 abstracts (original contributions) were submitted for evaluation. Each was graded by eight recognized authorities in a special area of interest. Acceptance for presentation was based on the relative grade ranking in each of the 26 categories. Ample meeting space combined with the introduction of poster sessions permitted the 1986 Annual Scientific Session Program Committee to accept 999 abstracts, approximately 33.5% of the number submitted. This represents the largest
... of abstracts accepted at any Quantitative angiographic evaluation of coronary lesions assumes circular lumen geometry, which may not be true. Intraoperative high frequency epicardial echocardiography (HFE) allows in-vivo evaluation of coronary lesions not previously possible. We utilized HFE in 26 patients (31 lesions) undergoing CABG. Lesion shapes based on contours of the arterial lumen and wall circumference were quantified. The variability of atherosclerotic involvement was measured using the ratio of maximum (max) to minimum (min) arterial wall thickness (WT), and the % of wall circumference that had normal WT (~0.7 mm in preVious studies). Residual coronary lumen shape was evaluated by measuring max/min lumen diameter (LD); shape was classified as circular (ratio~1.5:1); oval (>1.5:1) or complex. The location of the residual lumen within the vessel was considered eccentric if the lumen center was displaced from the vessel center by > 1 lumen radius. Results: Max/min WT was 3.1±0.3 M±SEK (range 1.3-7.5). 16731 lesions had ratios> 2.0, indicating varying degrees of wall involvement within individual lesions. Portions of the wall were normal in 16/31 lesions; the % normal circumference ranged from 9-85%. Max/min LD was 1.5±0.1 M±SEK (range 1.1 to 2.9). The shape of the residual coronary lumen was noncircular in 16 lesions: 13 oval, 3 complex. Seven residual coronary lumens were eccentrical y placed within the vessels. Conclusions: These data provide the first quantitative in-vivo measurements of cross-sectional coronary lesion morphology. In-vivo coronary lesions often have variable WT and noncircular lumens which are eccentrically placed. In these lesions,angiographic techniques for evaluating stenosis severity are likely to be inaccurate. Cardiology. Many excellent contributions were received for this year's competition, and we appreciate your support and interest.