cardiac perfusion test

I'm a newbie here and thought I would draw on others experiences. Last week I had a cardiac perfusion test at a local hospital...while I was in the treadmill part of the test, they increased the incline and speed every minute and a half, I got to the 7 minute mark, tough but doing it, they gave me the injection of radio-active material and said they wanted me to try to go to the 9 minute mark, I no sooner said okay and the doctor stopped the test abruptly He said I did pretty good, but did not reveal any other info...they did tell me if there was anything serious that they would tell me that day.....so I guess that's good...anyone know why they stopped the test of what it all means.....anyone with a similar story???  Waiting for the results in a hard process....thanks in advance for any help

hi lyn thanks

I becametired of waiting for an answer so I called the hospital directly .I'm not sure many could answer my question on a forum .