Cardiac Stress Testing

Tests that show how your heart performs under exertion to reveal hidden blood-flow problems.

What is a cardiac stress test?

A stress test measures how your heart responds to physical activity — usually walking on a treadmill — while we monitor your EKG, heart rate, and blood pressure. A nuclear or imaging stress test adds pictures of blood flow to the heart muscle for greater detail, and a stress echo uses ultrasound. For those who cannot exercise, medication can safely simulate the effects of exertion.

Why it's done

Stress testing helps evaluate chest pain, uncover reduced blood flow from coronary artery disease, assess the significance of a known blockage, gauge your exercise tolerance, and guide treatment or clearance for activity.

How to prepare

Wear comfortable clothing and walking shoes. You'll usually be asked to avoid eating, caffeine, and tobacco for a few hours beforehand, and we'll tell you whether to hold certain medications (such as beta-blockers) that could affect the results. Bring your medication list.

What to expect during the test

Electrodes are placed on your chest and you'll walk on a treadmill that gradually increases in speed and incline while we watch your heart in real time. You'll be asked to keep going until you reach a target heart rate or develop symptoms. Imaging studies add a set of pictures before and after exertion. Plan for about an hour, longer for nuclear studies.

After the test and results

You can usually return to normal activity right away. Dr. Dairywala reviews the results and explains what they mean — whether your heart handled the stress normally or whether further testing, such as angiography, is warranted.

Is it safe?

Stress tests are performed under continuous monitoring by trained staff and are very safe. Serious complications are rare, and the test is stopped immediately if you develop concerning symptoms.

Insurance & scheduling

We accept most major insurance plans, including Medicare. When a test or treatment is medically necessary, it is typically covered — our team verifies your benefits and explains any out-of-pocket costs before you begin. Request an appointment through our contact page or call (281) 807-5253.

Cardiology & vein care for Tomball & Cypress

Northwest Cardiovascular Clinic is located just off SH 249 (Tomball Parkway) in northwest Houston, serving patients throughout Tomball, Cypress, Spring, and the greater Houston area. Dr. Ismail Dairywala, MD, FACC brings over two decades of cardiovascular experience to every visit. Contact us to schedule a consultation.

Frequently asked questions

What should I wear and bring to a stress test?

Wear comfortable clothing and walking or athletic shoes, and bring your medication list. You'll usually be asked to avoid food, caffeine, and tobacco for a few hours beforehand.

How long does a stress test take?

A standard treadmill stress test takes about an hour including preparation and monitoring. Nuclear or imaging stress tests take longer because of the added pictures.

What if I can't walk on a treadmill?

No problem — a medication can be given that safely mimics the effect of exercise on the heart, so people who cannot walk or have joint or mobility issues can still have the test.

Is a stress test safe?

Yes. It is performed under continuous monitoring by trained staff and stopped immediately if you develop symptoms. Serious complications are rare.

What happens if my stress test is abnormal?

An abnormal result suggests reduced blood flow to the heart. Depending on the findings, the next step may be additional imaging or coronary angiography to look directly at the arteries.

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