ข้อควรรู้! เรื่อง การฉีดสีหลอดเลือดหัวใจ (Coronary Angiography ; CAG)

<p>Coronary angiography is a test performed by inserting a small tube called a catheter via an artery in the wrist or groin until the end of the tube reaches the coronary arteries. It does not require anesthesia. Only a local anesthetic is required. Then a radioactive contrast medium is injected by a small amount into the coronary arteries. Then x-rays are taken to record images of each of the coronary arteries.</p>
<h2><span style="color: #00826a;"><strong>Indications for Coronary Angiography</strong></span></h2>
<ul>
<li>Severe tightness of the chest like the chest is being compressed by a heavy object.</li>
<li>Heavy breathing, excessive sweating, exhaustion, angina, blackouts and fainting.</li>
<li>Pain or numbness toward the arm, shoulder and jaw.</li>
<li>History or risk of developing ischemic heart disease such as diabetes, hypertension, high cholesterol levels, family history of ischemic heart disease, obesity, smoking and lack of exercise.</li>
<li>Prior diagnosis of abnormalities from other screenings such as abnormal electrocardiogram and echocardiography results while walking on the treadmill.</li>
</ul>
<h2><span style="color: #00826a;"><strong>Preparations for Coronary Angiography</strong></span></h2>
<ul>
<li>Refrain from food and water for at least 4-6 hours.</li>
<li>If you have to take a regular medication, consult your doctor beforehand whether you can continue the medication or if you have to stop before the test.</li>
<li>If you have history of drug allergies or seafood, you have to inform your doctor in advance for consideration of administering an anti-allergy drug.</li>
<li>You should have blood tests first such as on kidney function, red blood cell function and minerals in the blood.</li>
<li>You should have a lung x-ray along with electrocardiogram.</li>
<li>Properly urinate before entering the coronary angiography room.</li>
</ul>
<h2><span style="color: #00826a;"><strong>Coronary Angiography Procedure</strong></span></h2>
<p>There are two techniques, namely, to insert a catheter via the wrist or via the groin. Doctors will decide based on the suitability for each patient.</p>
<ul>
<li>The wrist and groin are cleaned by using a sterilizing solution. Then the areas are covered with a sterile cloth.</li>
<li>Doctors will inject a local anesthetic at the site of the catheter insertion. If you experience abnormal symptoms like chest tightness or pain or nausea or vomiting, quickly notify your doctor.</li>
<li>A small catheter is inserted via the wrist or groin until its end reaches the coronary arteries for testing.</li>
<li>Doctors will inject a contrast medium into the coronary arteries and record images by using an x-ray machine from multiple angles. (During the injection of the contrast medium, the patient might feel hot flashes for about 10-15 minutes).</li>
</ul>
<h2><span style="color: #00826a;"><strong>Appropriate Practices after Coronary Angiography</strong></span></h2>
<p>If the coronary catheter was inserted by the wrist:</p>
<ul>
<li>Pressure will be applied to the wrist to stop the bleeding by use of a wrist strap for about 2-4 hours. After bleeding stops, a nurse will remove the strap. The patient may not remove the strap by himself or herself without the doctor’s permission.</li>
<li>After coronary angiography, the patient can sit up or walk around and can drink and eat.</li>
</ul>
<p>If the coronary catheter was inserted by the groin:</p>
<ul>
<li>Pressure will be applied to the wound at the groin for about 15-30 minutes to stop bleeding. After bleeding stops, a sticky plaster will be applied to prevent the wound from additional bleeding. Initially, pressure will be applied to the groin and the bleeding will be stopped by the use of a sand pillow (weighing about ½ &#8211; 1 kg).</li>
<li>Do not bend the legs or sit up or stand without your doctor’s permission.</li>
<li>After coronary artery angiography, the patient can eat and drink.</li>
</ul>
<p>&nbsp;</p>


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