angiogram stroke risk calculation

dear sir, madam I am conserned of the consequenses of the following: since strokes can follow an angiogram days or weeks after the procedure, when the pt is home, how can this stroke be included in the risk calculation?? It is also clear that google is in a total confusion re the calculation that ranges from one in 2000 to 3 in 100. In addition, micro and/or mine strokes can occur without detection since brain scan is not done after each angiogram. In conclusion, an angiogram is an out of control procedure!!! Where did I go wrong?? Or is this the best kept medical secret? I am keeping this knowledge confidential.    thanks  john olsson

[Cleveland Clinic]

I am not sure exactly what you are asking. I think all strokes that follow a cerebral angiogram should be included in the overall risk. This risk varies based on the overall risk of the population you are performing the procedure in. Also on whether an intervention was performed, and where the intervention was performed and on whether or not there was complete occlusion of the vessel or not, and on the presence of collaterals. Positive brain scans in the absence of symptoms are hard to validate so that is why they are not performed routinely.