The tracer is injected at the discretion of the monitoring physician and the exercise continued at the same stage or a lower stage for 60 sec. There is no reason for increasing the stage after the injection, the continuation of the exercise after the tracer injection is done to insure blood clearance of the tracer. The circulation time at rest is about 15 sec, and much shorter during exercise. It usually takes much longer for induced ischemia to resolve than for the tracer to clear the blood. BP fall to below resting level.
Most patients find exercise by walking natural and easy to perform.
BP measurements are often difficult to obtain due to patient motions and patient holding the support railing. ECG tracings tend to have more motion artifacts at high workloads due to patient motion. Nov 19, 1995.