"Normal Coronary Artery" With Slow Flow Improved by Adenosine Injection, Dipyridamole Treatment and Clinical Follow-up

The investigators will investigate patients undergoing coronary angiography with normal coronary but slow blood flow that was normalized after adenosine injection into the coronary artery. The investigators believe that they have small vessel coronary disease which is the initial presentation of coronary disease prior to anatomical narrowing. To alleviate this phenomenon the investigators intend to examine the long-term clinical response of these patients to treatment with dipyridamole, a well-known medication with almost no side-effects that increases the level of adenosine in the tissue.