SunnyD2,
The stress test is a test looking for blockages in the coronary arteries. It has an abnormality that suggest there may be a blockage in one of the arteries that is limiting blood flow (ischemia) to certain areas of the heart. Some of the features of the test confirm that this blockage may be significant (Transient left ventricular cavity dilation). A catheterization would be to assess the presence or absence of blockages. At that time, your physician will discuss the next steps which could include no changes, addition of medicines, angiopasty/stenting, or bypass surgery depending on the findings.
Hope this is a start.
good luck