This is a safe and painless procedure that uses a transducer (a small, microphone-type device) to send high frequency sound waves to the heart. The technologist can view the heart valves and pumping strength, look for structural defects, heart enlargement and/or fluid buildup. A Doppler exam and Color Flow exam are also performed. This allows doctors to evaluate blood flow through the heart. The technologist will videotape parts of the study for later diagnosis by the cardiologist.