十大靠谱网赌平台

What is a Dobutamine Stress Echocardiogram

应力超声心动图 A Dobutamine Stress Echocardiogram or DSE is generally done if a patient is unable to exercise on a treadmill to stress the heart, 就像典型的压力测试一样. A medication called dobutamine is administered intravenously and causes the heart to beat more rapidly, mimicking the effect of exercise on the heart. Once dobutamine has been administered, the doctor will perform the echocardiogram.

如何执行测试

就像典型的超声心动图一样, electrodes are stuck onto your chest to record your heart rate and rhythm. An instrument called a transducer (similar to a microphone) that releases high-frequency sound waves is placed on your ribs and directed toward the heart. Other images will be taken from other locations on your chest. An echocardiogram allows doctors to see the heart beating, 心脏瓣膜, 以及心脏的其他结构.

为什么要进行测试

十大靠谱网赌平台 may want to perform a DSE for the following reasons:

To assess the heart’s function and structure
To further assess known heart valve disease
To determine safe limits of exercise or activity after a heart attack, 心脏手术, 或者其他心脏问题
To evaluate cardiac function prior to 心脏手术

如何准备考试

Tell the doctor if you are allergic to latex or any medications.
You may be asked to fast (not eat) prior to the test. You will be given instructions about when to stop eating or drinking prior to the test.
Tobacco products and caffeinated beverages may be restricted several hours prior to the test.
Tell the doctor about all medications you are taking including supplements and herbs.
You may be asked to stop certain medications before the test, such as beta-blockers.
Tell the doctor if you are pregnant or could be pregnant.
Tell your doctor if you have a pacemaker.
Depending on your medical condition, your doctor may make additional preparations.

考试期间会发生什么

A DSE may be done on an outpatient basis or you may have one done if you are staying in the hospital for a cardiac issue.

You will remove any jewelry or other objects that may interfere with the test. You may wear glasses, dentures, or hearing aids.
You will be given a gown to wear and be asked to remove clothing from the waist up.
You will be asked to empty your bladder.
An intravenous line (IV) will be started in your hand or arm to administer the dobutamine and give you fluids, 如果需要.
You will start lying down on your left side on the table or bed, but you may be asked to change position during the test.
Small electrodes will be placed on your skin which are connected to an electrocardiogram (ECG) monitor. The ECG will monitor and record your heart’s electrical activity.
Your heart rate, blood pressure, breathing rate, and oxygen level will be monitored.
The room will be dark so the technician can more easily view the images on the echo monitor.
The technician will place warm gel on your chest and then position the transducer on the gel. You may feel a slight pressure as the technician moves the transducer to get the best image.
The dobutamine infusion will be administered at a rate determined by your weight. The rate of the infusion will increase until you have reached your target heart rate, (determined by your doctor based on age and physical condition) or the maximum allowable dosage of dobutamine.
After the dobutamine has been injected, 检查一下你的血压, 将进行心电图追踪, and the echocardiogram images will be recorded. This process will be repeated after each increase in dobutamine.
The dobutamine will be stopped after the target heart rate has been reached or the maximum amount has been administered. Your heart rate, blood pressure, and ECG will continue to be monitored for 10 to 15 minutes. Echocardiogram images will be recorded for a final time.
Tell the technician if you feel chest pain, trouble breathing, sweating, or heart palpitations.
Once the test has concluded and all images have been recorded, 凝胶会被擦掉的, 电极删除, 从你的手或胳膊上拿下来. 然后你就可以穿衣服了.

测试的潜在风险

There may be some risks associated with a DSE, including:

胸部疼痛
严重高血压
不规则的心跳
头晕
恶心想吐
极度疲劳
心脏病发作(罕见)

Certain conditions may interfere with a DSE, such as:

Smoking or using tobacco in any form within three hours of the test
Ingesting caffeine within three hours of the test
Taking beta-blocking medicines, as these make it hard to increase the heart rate