Cardiac Stress Tests: Types, Preparation and Results

A cardiac stress test evaluates how your heart responds when it is working harder. It can help investigate symptoms, assess certain heart conditions, and guide treatment decisions.

Testing usually involves walking on a treadmill or pedaling a stationary bicycle while your heart’s electrical activity, blood pressure, and symptoms are monitored. Some tests also include imaging of the heart.

Why Might You Need a Stress Test?

Exercise Stress Test

Also called a treadmill test or exercise ECG, this test records your heart’s electrical activity as exercise intensity gradually increases. Your care team monitors your blood pressure and symptoms.

Stress Echocardiogram

A stress echo uses ultrasound images to compare heart muscle movement at rest and during or immediately after stress. Stress may be induced by exercise or medication. It can help identify signs of reduced blood flow to the heart muscle.

Nuclear Stress Test

A nuclear stress test uses a small amount of radioactive tracer—not ordinary contrast dye—and specialized imaging to compare blood flow to the heart muscle at rest and during stress.

If you cannot exercise adequately, medication may be used to achieve the required effects for testing. Nuclear testing involves radiation exposure; tell your care team if you are pregnant or breastfeeding.

How to Prepare

Follow your testing facility’s instructions—preparation varies by test type.

• Ask about restrictions on food, caffeine, tobacco and medications.
• Wear comfortable clothing and walking shoes.
• Bring an updated medication list.
• Tell your care team about breathing conditions, mobility limitations and inhalers you use.

Do not stop prescribed medication unless your care team instructs you to.

What Happens During and After Testing?

Your care team takes baseline measurements and places ECG electrodes. During an exercise test, the workload gradually increases. Tell the team immediately if you develop chest discomfort, dizziness, or unusual shortness of breath.

The test can be stopped if you become uncomfortable or if monitoring shows concerning changes. Afterward, your team monitors your recovery and provides instructions for returning to usual activities.

Stress testing is generally safe when selected and supervised appropriately. Possible complications include changes in blood pressure and abnormal heart rhythms; a heart attack is very rare.

What Do the Results Mean?

Results help assess exercise tolerance, heart rhythm and possible blood-flow problems. An abnormal result may lead to additional imaging or other testing.

A normal result does not rule out all heart conditions or guarantee that you will not have a heart attack. Persistent or worsening symptoms still require evaluation.

Call 911 for possible heart attack symptoms, including chest pressure or discomfort with shortness of breath, sweating, nausea or pain spreading to the arm, jaw or back. Do not wait for a scheduled test.

Discuss Your Heart Health

Have questions about stress testing? Schedule a visit with tru Primary & Urgent Care to discuss your symptoms, risk factors, and appropriate next steps, including cardiology referrals as needed.

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