For a block look for the word Occlusion or occluded. Patent means open and no restriction. There will be a percentage given for how restricted the artery is. Also, you may see words like Distal, mid and proximal, just think of those as the bottom section, middle section and top section. Bifurcation is where two arteries join. Lumen is the space in the artery where blood flows through. Lesion is the diseased area.
The first letter of the main coronary arteries designate whether left or right. Such as LCX left circumflex LAD left anterior descending RCA right coronary artery. It would be better to look at a diagram rather than explain it, here's an example for you....
http://www.google.co.uk/imgres?imgurl=http://www.timmcmurry.com/files/coronary_arteries.jpg&imgrefurl=http://www.timmcmurry.com/CVRU_pages/CVRU_Employees.html&usg=__cMNW493MadflFdm8AKO9NLVb9pI=&h=628&w=684&sz=156&hl=en&start=3&zoom=1&tbnid=MCvssUEQYD78tM:&tbnh=128&tbnw=139&ei=m7JJTbfVDMqC5AahrcDuCw&prev=/images%3Fq%3Dcoronary%2Barteries%26hl%3Den%26sa%3DX%26biw%3D1005%26bih%3D661%26tbs%3Disch:1%26prmd%3Divnsb0,202&itbs=1&biw=1005&bih=661
With this image, imagine you are standing in front of a mirror looking at your heart. The right side of the diagram is the left side of the heart. Dotted arteries are at the back.
Usually, there is a report. Do you have the report, and if so you can post the information and someone can help you to understand the significance, etc.
Thanks for your question on the Heart forum, and if you have any further questions you welcome to respond. Take care.