Diagnosing Arteriovenous Fistula
An arteriovenous fistula (AVF) is an abnormal connection that forms between an artery and a vein. This connection allows blood to flow directly from the artery to the vein, bypassing the normal capillary network. When an AVF forms, it disrupts this process and affects the circulation in the affected area. The abnormal blood flow caused by AVFs can disrupt the normal circulation and lead to complications.
To diagnose an AVF, several examinations, screening tests, and procedures are performed. These help confirm the diagnosis and determine the type, severity, or stage of the AVF. The specialists involved in diagnosing an AVF may include a primary care physician, a vascular surgeon, or an interventional radiologist.
Here are the examinations, tests, and procedures used to diagnose and determine the characteristics of an AVF:
- Physical exam and medical history: The diagnostic process begins with a thorough physical exam and medical history. During this exam, the doctor will evaluate your vital signs and ask questions about your symptoms, such as when they started, their severity, and any factors that make them better or worse. They will also inquire about your personal or family history of medical conditions, previous surgeries or injuries, and medications or supplements you use.
- Duplex ultrasound: This test uses two types of ultrasound technology to examine how blood flows through your blood vessels. It helps the doctor assess the blood flow pattern in the affected area.
- Angiography: Angiography creates images of your blood vessels to evaluate their structure and blood flow. Traditional angiography involves X-rays and the insertion of a catheter, while newer options use CT scans or MRI scans. A special dye may be injected to enhance contrast in the images.
- CT or MRI angiogram: This non-invasive scan provides detailed X-ray images of your blood vessels after injecting dye into your wrist instead of using a catheter. It helps determine the location and treatment options for an AVF.
- Ultrasound: If pulsatile swelling or a palpable thrill is noted at the access site after a procedure, an ultrasound examination may be used to confirm whether it is an AVF or pseudoaneurysm.
These examinations and tests help confirm the presence of an AVF and provide information about its location, structure, and blood flow patterns. They assist specialists in determining the most appropriate treatment options for each individual case.
Remember that it's important to consult with a healthcare professional for an accurate diagnosis and appropriate treatment options specific to your situation.