Drexel Cardiology’s nuclear cardiologists maintain a state-of-the-art nuclear technology laboratory and have a well-established reputation for their diagnostic expertise.
Nuclear imaging studies can be used in several ways:
- Risk assessment: To evaluate an individual’s risk of incurring heart problems
- Diagnosis: To detect various forms of heart disease, including the extent and severity of coronary artery disease
- Pre-operative evaluation: To assess a patient’s suitability for cardiac surgery
- Post-treatment follow-up: To determine the results of treatments to restore adequate blood flow to the heart
In addition, nuclear cardiology studies, such as myocardial perfusion imaging, provide detailed information that guides cardiologists in making short- and long-term care management decisions. For example, a patient at low risk for a heart attack might be managed with medications alone, while one at high risk might be treated more aggressively, with surgery. Nuclear imaging studies can also help physicians derive optimal benefit from procedures, including heart surgery, coronary angiography and angioplasty. In some instances, the results of a nuclear study can help patients to avoid unnecessary surgery or, conversely, take advantage of a life-saving procedure.
Exercise Myocardial Perfusion Imaging
Exercise myocardial perfusion imaging, often referred to as myocardial nuclear studies, shows whether the heart is receiving an adequate supply of blood as well as the heart function.
The purpose of this study is to:
• Determine the location and extent of areas of the heart that are not receiving enough blood
• Provide information about the heart’s pumping ability
• Show areas of scarring after a heart attack
• Evaluate the results of treatments to restore sufficient blood flow to the heart, such as coronary artery bypass surgery or angioplasty
How this test is performed:
Two series of cardiac images are taken: one during exercise and one at rest. To begin, an intravenous line is placed in the arm and a radioactive material is injected through it. This substance is carried throughout the bloodstream. It highlights areas of the heart that are not receiving enough blood. This material does not usually cause side effects and is eliminated quickly by the body.
Next, EKG electrodes and a blood pressure cuff are applied so that blood pressure and heart rate can be monitored before, during and after exercise. The patient exercises on a treadmill, similar to a conventional stress treadmill test, at a gradually increasing pace. After the exercise portion of the study, cardiac images are obtained using a special camera that is able to trace the injected material in the heart. Patients are encouraged to breathe normally while these images are taken, but to remain completely still. After about 30 minutes, another series of “resting” images is obtained. The entire test takes between three and five hours.
Variations:
Some patients are unable to exercise due to orthopedic difficulties or other health problems. If so, the effect of exercise on the heart can be simulated with medication. For these patients, IV administration of this drug replaces the treadmill portion of the study.
Preparation:
Patients must not eat or drink anything except water for three hours before the test, and should avoid caffeine, including coffee, tea, chocolate and cola for before the study. Please consult your doctor for advice on whether to take your medications or hold them until after the study. If you are a diabetic, consult your physician regarding dietary restrictions and insulin use, if applicable.
Precautions:
Pregnancy—if you are pregnant, or suspect that you might be, please notify your physician or the technologist performing the study, before it begins.
The information on these pages is provided for educational purposes only and should not be used for diagnosis or as a substitute for consultation with a physician or healthcare professional. If you have specific questions or concerns about your health, you should consult your healthcare provider. |