Skip to Content

Noninvasive Cardiovascular Services

Our staff in the Danz Non-Invasive Cardiology Unit use the latest, most sophisticated technology to provide efficient and effective diagnosis and treatment of heart disease. Because cardiac services are immediately and easily available on site to physicians and patients, diagnostic testing is swift and effective. The services we provide include:


An echocardiogram, often called "echo," is a graphic outline of the heart's movement. During this test, high-frequency sound waves (ultrasound) are sent into the body. Echoes received are used to produce an image of the heart's chambers and valves. This allows the sonographer to evaluate chamber size, muscle function and valve structure and function. In conjunction with two-dimensional pictures, Doppler ultrasound and color Doppler are used to evaluate the blood flow through the heart and across the valves.

Stress Echocardiography

A stress echocardiogram ("stress echo") is a non-invasive test that combines ultrasound pictures of the heart with an exercise test. It checks the coronary arteries for narrowing by evaluating muscle function at rest and after exercise.


An electrocardiogram (ECG or EKG) detects the electrical impulses that cause the heart to contract. Changes in the EKG signal can indicate electrical disturbances of the heart conducting system, as well as structural abnormalities. For the EKG to chart the heart's electrical activity, electrodes are placed on the chest, wrists and ankles and are connected to a monitor that displays the heart's electrical impulses.

Nuclear Cardiology

Nuclear cardiology evaluates the function of the heart using radioisotopes injected into the bloodstream, which are tracked by a camera that photographs the progress of the isotope through the body. Nuclear cardiology can also examine how well blood is flowing to the heart muscle and measure the pumping function of the heart.

Holter Monitoring

Holter monitors record a patient's EKG over a 24- to 48-hour period. The monitor is the size of a Walkman radio that you can wear on your belt or over your shoulder on an accompanying strap. The monitor records every heartbeat over the test period, which is then analyzed for the presence of heart rhythm irregularities. Upon completion of the test, the monitor is returned and analyzed by Overlake technicians. Results are available to the referring physician within 24 hours.

If you are having problems with your Holter Monitor or need additional supplies, please call our EKG department at 425-688-5092.

If you need to schedule a Holter Monitor test, please call our Cardiovascular Scheduler at 425-688-5590.

Event Monitoring

Cardiac Event Monitors are worn by patients for periods up to one month. These devices record a patient's EKG using a sophisticated electronic device that continually records approximately three minutes of information. If you recognize a symptom or "event," you press a button on the device, thus identifying the past three minutes of stored information as a symptom-related event. The information is then transmitted to a technician using a standard telephone where the nature of the event is evaluated and immediately passed on to the referring physician.

If you are having problems with your event monitor or need additional supplies, please call our EKG Department at 425-688-5092.

If you need to schedule an Event Monitor test, please call our cardiovascular scheduler at 425-688-5590.