Leachman Cardiology
Physician's Bios
D. Richard Leachman, M.D.
Roberto Lufschanowski, M.D.
Paolo Angelini, M. D.
Zvonimir Krajcer, M.D.
Alberto Lopez, M.D.
Stephanie Coulter, M.D.
Eduardo Hernandez, M.D.


The Adenosine nuclear stress test is a diagnostic test used to evaluate blood flow to the heart. During the test, a small amount of radioactive tracer is injected into a vein. A special camera, called a gamma camera, detects the radiation released by the tracer to produce computer images of the heart.

Combined with exercise, the test can help determine if there is adequate blood flow to the heart during activity versus at rest.

What do I do?
  • NO caffeine or decaffeinated products 24 hours prior to the test (This includes coffee, sodas, chocolate and tea.
  • Don't eat or drink anything 8 hours before the test (see exception below).
  • Take your medications the morning of your appointment with a sip of water.
  • Bring a list of your current medications, including the dose.
  • Wear comfortable, loose fitting clothes and walking or exercise shoes.
What will happen?
We obtain a brief history emphasizing current symptoms and pertinent family history. A small intravenous (IV) line is inserted into your arm and electrodes are attached to your chest. The first dose of imaging agent is injected through the IV. Resting images are obtained with the Nuclear camera moving around your chest. Adenosine is infused through the IV to increase the heart rate to increase blood flow through the coronary arteries. The effect is similar to what happens during exercise. You are continuously monitored by a physician using an EKG during the infusion. A second dose of imaging agent is injected in the IV. Let the staff know immediately if you are feeling discomfort such as burning, aching, or tightness in your chest or nauseated, dizzy or exhausted. Stress images are obtained 60 minutes after the infusion.

How long does it take?
The test takes about three (3) hours.


If the patient is scheduled for afternoon testing, the patient can eat a small piece of toast, small banana or small bowl of oatmeal with water or juice before 8:00 AM. Nothing may be eaten after 8:00 AM. If you are diabetic, you may request to be scheduled in the afternoon, so that you can eat in the morning.

Medical Center Location
Leachman Cardiology
6624 Fannin
Suite 2780
Houston, Texas 77030


(713) 790-9401

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