1. Predict the effect of exercise on ECG. 2. Which wave/ interval /time changed the most? a. Why? Did this confirm your hypothesis? 3. Patients may exhibit a condition known as heart block. Complete (total) heart block exists when there is no conduction between the atria and the ventricles. Incomplete (partial) heart block exists in two basic forms. In first degree heart block, there is a delay in conduction between the atria and ventricles so that the P-R interval is > 0.2 sec. In second degree heart block, only some of the signals from the SA node reach the ventricles. Predict what effect these conditions would have on the ECG. In the space below draw 3 ECG tracings: (Note: background slides have this info for reference) a. first-degree heart block. Mark with an arrow which interval/wave changes the most