The treadmill stress test doesn't tell all that much. I think going to the cardiologist and taking the stress test with injections of isotopes was a better indicator of how the heart is working. That way the cardiologist can actually watch the blood flow on his screen during exercise to determine any obstruction.

The better way is the invasive technique of angioplasty. As with any invasive technique, you want a well trained and competent cardiologist. Someone who does many of these procedures per year will most likely be better at it.