Heart computer tomography - Hospital Medical Information

Justice
With the recent rapid development of computed tomography ( CT ), it has become possible to image a continuously moving heart within a short period of time. A 64-ray multidetector computed tomography (CT), widely used for cardiac imaging, has a high negative predictive value and is almost 100% less likely to be true stenosis if no stenosis is detected on CT. Dual source CT ( dual source CT ) has two x-ray tubes, doubling the acquisition time to improve diagnostic accuracy and image quality. Therefore, the burden of invasive conventional angiography has been alleviated in order to rule out the possibility of stenosis .

Heart Computed Tomography ( Cardiac CT ) coronary artery stenosis evaluation, coronary artery bypass surgery graft vascular assessment, and coronary stenting and it is widely used in restenosis evaluation after its addition to the normal variability of the coronary arteries, and congenital malformations, cardiac contraction performance evaluation, the aorta , including the preoperative evaluation of valvular aortic ectasia and peeling, such as aortic diseaseAnd postoperative evaluation. It is also used in the emergency department to differentiate acute chest pain and is recently used as a screening test for coronary artery stenosis in patients with high risk of coronary artery disease.


Inspection cycle
Chest pain may be evaluated to assess coronary artery stenosis, and in the presence of nonspecific chest pain, coronary artery stenosis may be performed.

Preparations
The use of contrast media requires a minimum of 4 hours of fasting.

method of inspection
If the heart rate is less than 65 beats per minute, it will be shot immediately. If the heart rate is above that, check the blood pressure and heart rate before the computer tomography . The blood vessels are usually secured with a thick needle on the upper arm vein , and then electrocardiograms are attached to the computed tomography table while lying on the table. Then nitroglycerin , which is dissolved in the form of spray or under the tongue , . During shooting, breathing should be stopped for about 10 seconds, and a high contrast medium of about 80 to 100 mL is injected at a high rate, so there is a feeling of warmth by the contrast agent, but it is not surprising.


seconds to take the image, but it takes about 10 to 30 minutes because it takes some time to adjust the heart rate and prepare for the test.

Precautions
Follow the instructions and take

good care of your breathing. Do not move while shooting . To see the small coronary artery, nitroglycerin, a vasodilator , is administered just before the test. If you are taking erectile dysfunction medication such as Viagra or Levitra , Because of the potential for complications that may lead to the need for consultation with your doctor, you should stop taking the dose several days before the test. It is very important to stop breathing during shooting because the image will be distorted and coronary artery evaluation becomes impossible if you can not tolerate breathing during shooting. You should not move during shooting because you are well informed about breathing well.

result
At the end of the video recording it is represented in the form of a computer file formats or film it Radiology by the interpretation doctor using a three-dimensional (3D) images, create a special program, if provided. In recent years, when analyzing or preserving images, it is possible to use a large amount of digital image data in a file format rather than a film and carry it on a CD to take it to another hospital. The readings written by the Department of Radiology are delivered to the department, and the clinician uses the results as data for diagnosis and treatment.

Cardiac CT can not only diagnose coronary artery stenosis but also evaluate structural abnormalities of the aortic and pulmonary vessels, myocardial and valvular structural abnormalities at the same time. But the disadvantage that the radiation amount of widening the heart if the obtained images in all cardiac cycle CT in evaluating the movement of the heart muscle and valves with structural cardiac ataxia and for arteries to diagnose, such as stenosis and Kona heart in Siem MRI as Functional evaluation is also possible. There are some limitations in assessing coronary stenosis with CT

( Computed Tomography ). First, the presence and severity of coronary artery stenosis and the precise assessment of atherosclerotic plaques are difficult when severe calcifications are present. Second, patients with rapid heart rate or arrhythmiaThe diagnosis is limited because it is difficult to obtain good images in patients with Third, small vessels less than 1.5 mm in diameter are difficult to assess due to mechanical limitations . For these reasons, cardiac computed tomography alone does not lead to diagnosis and may require additional tests.

Reading scene
Side effects / after effects
Because contrast agents are used, contrast agent side effects may occur rarely in people. The degree of side effects is usually mild, with slight vomiting , urticaria , itching , redness of the face, coughing , hoarseness, runny nose, spots , temporary dyspnea, but usually the symptoms disappear without any action. However, rarely, hypersensitivity reactions occur and appropriate treatment is required. In rare cases, mortality is reported as a statistical frequency of 30,000 or 100,000. Preparations such as first aid treatment are prepared in case this side effect of contrast agent occurs.

Diagnostic disease
Coronary artery stenosis, normal variation of coronary artery and congenital anomalies, evaluation of restenosis after coronary stenting, evaluation of graft vessels after coronary artery bypass surgery