Digital scan to erase the pulmonary artery background

This is an automatically translated article.

The article is expertly consulted by Master, Resident, Specialist I Trinh Le Hong Minh - Radiologist - Radiology Department - Vinmec Central Park International General Hospital.
The pulmonary artery is a blood vessel that carries blood to the lungs and from the lungs to other organs. Digital erasure of the pulmonary artery background will help doctors collect images of this part to serve the process of examination and diagnosis.

1. What is a digitized scan of the pulmonary artery background?

The pulmonary artery is one of the blood vessels in the circulatory system of the body. Unlike other arteries, the pulmonary artery will have a lower amount of oxygen than the average arteries.
Digital angiography of the pulmonary artery background is a procedure using iodinated contrast agent to visualize the entire pulmonary artery: funnel, common trunk and bilateral pulmonary artery. Currently, this technique is most commonly used in the diagnosis of pulmonary embolism, a condition in which substances travel from different parts of the body through the bloodstream to block the lungs.
In addition, pulmonary angiography not only helps in morphological diagnosis, it also allows hemodynamic assessment by measuring parameters such as: blood pressure, oxygen saturation...

2. In what cases is a digital scan to erase the pulmonary artery background indicated?

Some of the following cases will often be indicated to use the digital imaging procedure to erase the pulmonary artery background:
Diseases related to the pulmonary vasculature: pulmonary embolism, atrophy or dilation of the pulmonary arteries, arteriovenous catheterization Pulmonary vessels, reverse position... Trauma to the chest area suspected of pulmonary vascular injury. Tumors in the lungs, mediastinum are suspected with vascular invasion. Pulmonary angiography in preparation for transplantation. Angiography to serve for interventional radiology.

3. Contraindications for digitized angiography to clear the pulmonary artery background for which cases?

At present, there are no specific cases where digital angiography of the pulmonary artery background is absolutely contraindicated. However, this technique will be relatively contraindicated in the following cases: Having a blood clotting disorder, kidney failure, having a history of obvious allergy to iodine contrast agents, pregnant women.

4. What patients need to pay attention to when conducting digital scan to erase the pulmonary artery background

First, the patient needs to know the information and procedures related to the digitized scan of the pulmonary artery background so that he can coordinate with the doctor. Then, within 6 hours before the procedure, the patient needs to fast, and only drink a quantity of water not exceeding 50ml.
When entering the intervention room, the patient will lie on his back and install a monitor to monitor breathing, pulse, blood pressure, electrocardiogram, SpO2. Disinfect the skin, then cover with a sterile, perforated cloth.
If the patient is too excited and cannot lie still, it is necessary to give sedation or take appropriate measures.

5. Steps to conduct digital scan to erase the pulmonary artery background

Step 1: Anesthesia Method Place the patient supine on the table, place an intravenous line. Usually, local anesthesia will be administered, but with exceptions such as young children (under 5 years old) who are not yet conscious of cooperation or too excited to be afraid, general anesthesia is required during the procedure.
Step 2: Select the technique to use and the inlet of the catheter The technique used is Seldinger, the route of entry of the catheter can be: from the femoral artery, axillary artery, brachial artery or radial artery. Usually, the technique will use the femoral artery entrance, unless this is not possible, use other entrances. Step 3: Diagnostic angiogram Disinfect and anesthetize the puncture site and then insert the needle to place the catheter into the vein. Next, insert a 4 or 5F catheter from the femoral vein, through the inferior vena cava to the right atrium, and into the right ventricle. Based on the diagnostic requirements of each pulmonary artery to place the catheter tip in an appropriate position such as the pulmonary funnel, the common trunk of the pulmonary artery or each side of the right and left pulmonary arteries for imaging. Iodine contrast is injected into the vessel by a pump with a high pressure of 500 PSI, the volume and speed of the injection depending on the position of the catheter tip. The imaging and imaging processes will focus on each lung field and record the arterial, parenchymal, and venous phases. After completing the requirements of the digital angiography to erase the background of the pulmonary artery, the doctor will withdraw the catheter and tube into the lumen and then apply pressure directly on the needle puncture site for about 10 minutes to stop the bleeding, then bandage it. pressed for 4 hours. Digital erasure of the pulmonary artery background will normally be used in the morphological diagnosis. But besides that, this technique also promotes its effectiveness in measuring parameters such as blood pressure, oxygen saturation...
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