Cardiology is the medical specialty focused on the heart and the cardiovascular system. It involves the diagnosis, treatment, and prevention of conditions affecting the heart and blood vessels. These conditions include coronary artery disease, heart failure, arrhythmias (irregular heartbeats), and valve disorders. The field covers a broad spectrum, from congenital heart defects present at birth to acquired conditions like heart attacks.
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Before a doctor recommends a peripheral angiogram, they usually perform a series of noninvasive tests to confirm that the circulation is the problem. The diagnostic process begins with basic clues and progresses towards advanced imaging techniques. The goal is to build a strong case that a blockage exists and to understand its general location before inserting any catheters.
These initial tests are typically painless and done in a regular doctor’s office or a vascular lab. They help the medical team measure how much blood is reaching the limbs and compare it to normal levels. Only when these tests point to a significant problem is the invasive angiogram scheduled. This methodical approach guarantees that patients don’t undergo needless procedures.
The first diagnostic tool is the doctor’s hands. During a physical exam, the doctor will feel for pulses at various points on your body: the groin, behind the knee, at the ankle, and on the top of the foot. A strong, rhythmic pulse indicates excellent blood flow. A weak pulse, or no pulse at all, is a strong indicator of a blockage upstream.
The doctor will also look at your feet and legs. They check for hair loss, shiny skin, thickened toenails, and coolness to the touch. They may perform a simple test called a capillary refill test, where they squeeze the tip of your toe until it turns white and then time how long it takes to turn pink again. Delayed color return suggests poor blood flow.
The Ankle-Brachial Index, or ABI, is the most common screening test for peripheral artery disease. It is a simple comparison of the blood pressure in your ankle to the blood pressure in your arm.
To do this test, you lie on a table. A blood pressure cuff is placed on your arm and another on your ankle. The doctor uses a small handheld ultrasound device called a Doppler to listen to the blood flow while inflating and deflating the cuffs.
The ABI is calculated by dividing the ankle pressure by the arm pressure.
If the ABI is abnormal, the next step is usually a duplex ultrasound. This test uses sound waves to create pictures of the blood vessels and measure the speed of the blood flow. It is “duplex” because it combines two types of ultrasound: traditional imaging to see the structure of the artery and Doppler ultrasound to see the movement of blood.
The technician applies gel to your leg and moves a wand over the arteries. On the screen, the blood flow shows up as colors (usually red and blue). If the artery is narrowed, the blood has to speed up to squeeze through, much like putting your thumb over a garden hose. The ultrasound can detect this increased speed and pinpoint exactly where the narrowing is located.
If the ABI is abnormal, the next step is usually a duplex ultrasound. This test uses sound waves to create pictures of the blood vessels and measure the speed of the blood flow. It is “duplex” because it combines two types of ultrasound: traditional imaging to see the structure of the artery and Doppler ultrasound to see the movement of blood.
The technician applies gel to your leg and moves a wand over the arteries. On the screen, the blood flow shows up as colors (usually red and blue). If the artery is narrowed, the blood has to speed up to squeeze through, much like putting your thumb over a garden hose. The ultrasound can detect this increased speed and pinpoint exactly where the narrowing is located.
The peripheral angiogram is the final confirmation. It is an invasive test, meaning it involves entering the body. You will be taken to the cath lab and lie on an X-ray table. The area where the catheter will serve as the entry point (usually the groin) is cleaned and numbed.
The doctor inserts a sheath into the artery. Through this sheath, catheters are navigated to the area of interest. Contrast dye is injected, and X-ray cameras move around you to take movies of the flow. You might be asked to hold your breath for a few seconds to keep the image still. This test provides the most accurate “ground truth” about the blockages.
The doctor watches a screen to guide the wire. Since the inside of blood vessels has no sensation, you won’t feel the wire moving. You might feel pressure at the insertion site. The ability to steer the catheter directly to the problem area is what sets this test apart from external scans.
The images from an angiogram look like black rivers on a grey background. A healthy artery looks like a smooth, wide river. A diseased artery looks ragged and narrow or may disappear completely if it is totally blocked.
The doctor looks for “stenosis,” which is narrowing. A 50 percent stenosis means the artery is half as wide as it should be. They also look for “collaterals”—tiny, squiggly vessels that the body has grown to bypass a blockage. The presence of collateral confirms that the blockage has been around for a long time. Based on these images, the doctor decides whether to treat with medication, angioplasty, or surgery.
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Usually, yes. However, in people with diabetes or severe kidney disease, the arteries can be calcified and stiff (like hard pipes). Such conditions can give a falsely high or “normal” reading even if blockages exist. In these cases, a toe pressure test is used instead.
Yes, the Doppler part of the ultrasound makes a swishing sound. This is the sound of your blood pumping. The technician listens to the pitch of this swoosh to judge the blood flow speed.
It depends on the pacemaker. Many modern devices are “MRI conditional,” meaning they are safe under certain settings. Older devices may not be safe. A CT scan is usually the alternative if you cannot have an MRI.
No special preparation is needed. You do not need to fast. You just need to remove your shoes and socks so the cuffs can be placed on your ankles.
Without the dye, the blood vessels look the same as the muscles and other tissues on the X-ray. The dye makes the blood “light up” white, allowing the computer to separate the arteries from the rest of the body.
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