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 percutaneous closure can be planned, the medical team must confirm the presence of a defect, measure its exact size, and assess the surrounding anatomy. Diagnosing a hole in the heart requires looking inside the chest without opening it. Fortunately, modern cardiology offers a suite of advanced imaging tools that use sound waves, bubbles, and cameras to build a precise 3D map of the heart.
The diagnostic journey usually moves from simple, noninvasive screening tests to more specialized procedures. The goal is to answer three questions: Is there a hole? How big is it? And is it causing the patient’s symptoms? This careful gathering of evidence ensures that only patients who will truly benefit from the procedure undergo it.
The first step in diagnosing a heart defect is almost always a transthoracic echocardiogram, or TTE. This is a standard ultrasound of the heart. It is the same technology used to see babies in the womb. The technician puts some cool gel on the chest and moves a wand (transducer) across the skin.
Sound waves bounce off the heart structures and create a moving picture on a screen. The doctor can see the four chambers of the heart and the walls separating them. They look for interruptions in the walls (ASDs) or turbulent blood flow that suggests a leak. The doctor uses a color Doppler, which displays blood flow as red or blue flames on the screen; a jet of color crossing the wall indicates a hole.
A standard ultrasound might miss a small hole or a PFO because the flap usually stays closed. To find these hidden leaks, doctors use a “bubble study” in conjunction with the echocardiogram. This technique is a clever and simple test.
The doctor or nurse inserts an IV into a vein in the arm. They take a syringe of sterile saline (salt water) and mix it with a tiny amount of air by shaking it back and forth between two syringes. This technique creates microscopic “microbubbles.” This fizzy saline is injected into the vein. On the ultrasound screen, the bubbles appear as bright white specks rushing into the right side of the heart.
Normally, these bubbles are filtered out by the lungs. However, if there is a hole connecting the right side to the left side, some bubbles will escape and appear on the left side of the heart. Seeing bubbles cross over confirms the diagnosis.
While a standard echo (TTE) is useful for screening, it looks at the heart through the ribs and lungs, which can block the view. To obtain a high-definition, close-up look at the defect, doctors perform a transesophageal echocardiogram (TEE).
In this test, a specialized ultrasound probe is attached to a thin, flexible tube. The throat is numbed with spray, and the patient is given sedation to relax them. The tube is then gently guided down the esophagus (the food pipe). Since the esophagus sits directly behind the heart, there are no ribs or lungs in the way. The camera can capture clear images of the atrial septum, which is the wall between the upper chambers. This test allows the doctor to measure the hole down to the millimeter and check the “rims” of tissue around it to ensure a device can hold on safely.
Sometimes, imaging is done during the closure procedure itself using Intracardiac Echocardiography (ICE). This involves inserting a tiny ultrasound probe through a vein in the leg, just like the closure catheter. This probe goes right inside the heart chambers.
ICE is incredibly useful because it allows the doctor to see the heart from the inside while they are working. It eliminates the need for general anesthesia in many cases because there is no tube down the throat (like in a TEE). The patient can be awake and comfortable while the doctor gets perfect, real-time images to guide the device into place.
For complex defects or when ultrasound views are poor, doctors may turn to MRI or CT scans. These are advanced imaging modalities that take cross-sectional pictures of the chest.
A cardiac MRI is excellent for measuring the volume of the heart chambers. If an ASD has been present for a long time, the right ventricle may be enlarged. MRI can calculate exactly how much bigger it is and how much extra blood is flowing. This helps quantify the severity of the defect. Cardiac CT is fast and provides a detailed 3D reconstruction of the heart’s anatomy, which can be helpful if there are unusual vein connections associated with the defect.
In patients being evaluated for a PFO after a stroke, a transcranial Doppler (TCD) might be used. This is an ultrasound of the brain’s blood vessels. It is often combined with a bubble study.
Instead of watching the heart, the technician places the ultrasound wand on the temple or the back of the neck to watch the arteries feeding the brain. When the bubbles are injected, the machine listens for the “chirp” of bubbles passing through the brain arteries. If bubbles are detected in the brain, it proves that there is a pathway from the veins to the arteries, confirming a significant shunt. It is a very sensitive test for detecting PFOs.
Before closing a hole in the heart, especially in patients over age 40 or 50, the doctor often performs a diagnostic cardiac catheterization. This is to check the coronary arteries for blockages. It ensures that the patient doesn’t also have coronary artery disease that might need fixing.
A small tube is threaded to the heart, and dye is injected into the arteries. An X-ray movie records the flow. At the same time, the doctor can measure the pressures inside the heart chambers. Measuring the pressure is vital to ensure that closing the hole won’t cause air air pressure to build up dangerously in the lungs.
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No, the bubble study does not hurt. The bubbles are made of saline and air, which are harmless and dissolve in your blood quickly. The only sensation is the small poke of the IV needle.
The regular echo (TTE) is like looking through a frosted window. It indicates that something is present, but it does not provide the specific details. The TEE is like opening the window. Doctors need the precise measurements from the TEE to pick the exact right size of the closure device so it doesn’t slip.
Standard echocardiograms and MRIs use no radiation. CT scans and catheterization (using fluoroscopy/X-rays) do involve a small, safe amount of radiation. Doctors always aim to use the minimum amount necessary.
No. Because you are given sedation to relax your throat and keep you calm, you will be groggy. You must have someone drive you home after a transesophageal echocardiogram.
If all tests (including bubble study and TEE) are negative, then it is very unlikely you have a significant heart defect. Your doctor will look for other causes of your symptoms, such as heart rhythm disorders or other vascular issues.
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