الفهرس 
The validity of different equations for prediction of left main coronary artery diameter as predicted from the diameters of its branch vessels using conventional and computed tomography coronary angiograms
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Abstract
Background: Data about the ”true” normal diameters of human coronary arteries are not available in a systematic format. Four models (i.e., Murray, Finet, area- preservation and HK models) have been proposed to express a diameter relationship between the three segments of arterial bifurcation. These models can be used to predict the normal diameter of the left main coronary artery (LMCA) from the diameters of its daughter branches. This can be particularly important in percutaneous coronary intervention (PCI) to diffusely diseased LMCA which is becoming increasingly common nowadays. Aim: Evaluation of the validity of the four models for prediction of LMCA diameter from the diameters of its branch vessels in subjects with normal coronary arteries. Methods: One hundred patients with normal coronary arteries on MSCT-Coronary angiography (group 1) and thirty patients with normal coronary arteries on conventional coronary angiography (group 2) were included in our study. In both groups, the observed diameters of the LMCA, LAD and LCX were measured by dedicated software and compared to the predicted diameters using the four models. Results: All the four models were valid for prediction of LMCA diameter from diameters of its branch vessels in both groups. In group (1), all the four equations predicted the LMCA diameters to be larger than the observed diameters and Murray equation was the most accurate in that prediction (2.75 % error), HK and Finet were comparable (9.30 and 9.12 % error respectively) and AP was the least accurate (14.60 % error). In group (2), all the four equations predicted the LMCA diameters to be smaller than the observed diameters, with AP equation was the most accurate in that prediction (2.9 % error), HK and Finet were comparable and Murray was the least accurate (-7.6 % error). HK and Finet models were comparable and relatively accurate in both groups. We derived two equations for prediction of LMCA diameter from diameters of its branch vessels depending on observed measurements of LMCA, LAD and LCX arteries; for MSCT- Coronary angiography: LMCA diameter = 1.2 + 0.7 LAD + 0.2 LCX and for conventional coronary angiography: LMCA diameter = 0.9 + 0.45 LAD + 0.7 LCX