A monitored ultrasound assessment of how the heart works under controlled medication stress.
A dobutamine stress echocardiogram examines how the heart muscle and valves respond as the heart is made to work harder. Instead of a treadmill or exercise bike, dobutamine is given through a vein to increase heart rate and the strength of contraction in a controlled way.
Ultrasound images are taken before, during and after the medicine. One common reason is to look for inducible ischaemia, where part of the heart muscle may not receive enough blood under stress. It is also used for selected valve and heart-muscle questions.
Dr Mark Cassar personally performs and interprets dobutamine stress echocardiography, allowing the images, symptoms, ECG and blood pressure response to be assessed together.
This differs from a resting transthoracic echocardiogram and from transoesophageal echocardiography, which provides closer views of selected structures.
The test can assess whether heart-muscle movement becomes abnormal during stress, whether findings support reduced blood flow as a possible explanation for symptoms, selected valve conditions under increased workload and, in selected circumstances, whether weakened heart muscle may remain viable.
A normal result can be reassuring, but it does not prove every coronary artery is free of disease. An abnormal result does not define the exact coronary anatomy by itself.
Dobutamine creates controlled cardiac stress while the patient remains on the examination couch. It is not the same as treadmill stress testing.
The test shows how the heart responds under stress. It does not display coronary anatomy in the same way as CT or invasive angiography.
ECG electrodes and a blood pressure cuff are applied, a cannula is placed into a vein, and resting ultrasound images are recorded. Dobutamine is then administered gradually while further images, heart rhythm, blood pressure and symptoms are monitored. The medicine is stopped when the required information is obtained or sooner if clinically necessary.
Ultrasound contrast may be used to improve image definition, and atropine is used in some protocols when the required heart rate has not been reached. These are not needed for every patient. Do not stop medicines or alter food and drink unless the testing team instructs you.
Significant complications are uncommon but can include a marked blood-pressure change, severe chest pain, a potentially serious arrhythmia or, rarely, a heart attack. The result depends on image quality, the level of stress achieved and the complete clinical context.
Shows coronary-artery anatomy rather than the functional response to stress.
Provides detailed coronary anatomy and allows treatment during the same procedure where appropriate.
A different form of functional imaging with detailed heart-muscle assessment.
Used when physical exercise is suitable and answers the relevant clinical question.
No. Both use ultrasound under stress, but one uses exercise and the other medication. They are selected for different clinical reasons.
Dobutamine makes the heart beat faster and more strongly, allowing its response to increased workload to be assessed without physical exercise.
Yes. You remain awake and can speak to the team while your rhythm, blood pressure, symptoms and images are monitored.
No. Echocardiography uses ultrasound and does not expose you to ionising radiation.
No. It may be recommended when the borders of the heart muscle are not clear enough on standard images.
Do not stop or change medication unless the testing team gives specific instructions. Preparation varies with the clinical question and protocol.
Dr Mark Cassar can review the clinical question and advise whether dobutamine stress echocardiography or another form of cardiac assessment is most appropriate.
