There's an ECG and a STRESS ECG (Bruce's Protocol) which goes for about 9 minutes on a treadmill. Plenty of Cardiac specialists warn about it. I compare it to testing a rope bridge by running a war tank across it. Plenty of participants have had a heart attack about 10 (TEN) days after it. Ultrasounds are non invasive and provide a lot of useful Information about how blood is flowing in your Heart and Carotid arteries.. Attrial fibrillation is usually a quick death. You usually get an Oh NO! out and that's it. That's the condition a Pacemaker Controls. Nev