Intravascular Ultrasound (IVUS)

Intravascular ultrasound — also written as IVUS — is a medical imaging technique used to look at the inside walls of the arteries that supply blood to the heart. The word "intravascular" simply means "inside the blood vessel."

A very small ultrasound probe is placed at the tip of a thin, flexible tube called a catheter. This catheter is guided through the blood vessel until it reaches the area of concern. The probe then sends out sound waves. These sound waves bounce off the artery walls and return as signals, which are converted into real-time images on a monitor.

Unlike a standard angiogram, which shows only the shadow of blood flowing through the artery, intravascular ultrasound shows the actual thickness and condition of the artery wall. It can reveal plaque build-up, calcium deposits, and any weak spots in the vessel wall — details that are often invisible in a normal scan.

Dr. Karthick Sabapathi uses cardiac intravascular ultrasound to get a full picture of what is happening inside the artery before deciding on the best way to treat it.

The procedure begins like a standard cardiac catheterization. A small puncture is made, usually in the wrist or the groin area. A thin, flexible tube (catheter) is then carefully guided through the blood vessels towards the heart arteries using X-ray guidance.

At the tip of this catheter sits the ultrasound probe — no bigger than a few millimetres. Once it reaches the target area inside the artery, the probe begins rotating and sending out high-frequency sound waves in all directions.

As the catheter is slowly pulled back through the artery, it captures a continuous series of cross-sectional images — almost like taking slices of the artery at every millimetre. These images are displayed live on a screen and can be reviewed in detail.

The result is a precise, three-dimensional-like view of the inside of the artery — showing the lumen (the opening through which blood flows), the artery wall layers, and any blockages or abnormalities. This level of detail is what makes intravascular ultrasound so valuable in planning and delivering accurate cardiac treatment.

There are several ways this procedure adds value to your cardiac care:

• It helps Dr. Karthick Sabapathi understand the true extent and nature of a blockage — whether it is soft plaque, hard calcium, or a mixture of both — which changes how it should be treated.
• It guides the placement of stents (small mesh tubes used to keep arteries open) with greater precision. This reduces the chance of the stent not being placed correctly, which is one of the main causes of repeat blockages.
• After a stent has been placed, cardiac intravascular ultrasound can confirm that the stent has expanded fully and is pressed correctly against the artery wall.
• In some cases, what looks like a blockage on an angiogram may actually be less severe than it appears. IVUS provides a more accurate measurement, which can help avoid unnecessary procedures.
• It helps evaluate arteries after a previous heart procedure to check if there has been any re-narrowing or new build-up.

In short, intravascular ultrasound treatment in Chennai under Dr. Karthick Sabapathi gives you the advantage of more accurate diagnosis and more precisely guided treatment — which leads to better outcomes.

Here is a step-by-step overview of what to expect:

Before the Procedure

You will be asked to avoid eating or drinking for a few hours before the procedure. Blood thinning medication may be adjusted beforehand. The care team will explain everything and answer any questions you have.

During the Procedure

You will be given local anaesthesia at the access point — usually the wrist or groin — to numb the area. You will be awake throughout but made comfortable. A catheter is gently inserted and guided to the heart arteries. Once in position, the IVUS catheter captures detailed images while being slowly pulled back through the artery.

The imaging part of the procedure takes around 10 to 20 minutes. If stent placement or another intervention is being done at the same time, the total procedure time will be longer.

After the Procedure

You will rest in a recovery area while the care team monitors your vital signs. Most patients are able to go home the same day or the following morning, depending on what was done. Dr. Karthick Sabapathi will discuss the findingsx with you and explain the next steps in your care.

There are clear, well-established reasons why cardiac intravascular ultrasound is considered a gold standard imaging tool in interventional cardiology:

• Highly detailed images: IVUS provides cross-sectional views of the artery that no external imaging method can replicate.
• Better stent outcomes: Studies have consistently shown that stents placed with IVUS guidance have a higher success rate and a lower chance of complications compared to those placed without it.
• Avoids over-treatment: Because IVUS shows the true severity of a blockage, it can prevent unnecessary stent placements, reducing risk and cost.
• Useful in complex cases: For patients with multiple blockages, very long lesions, or blockages near artery branches, IVUS provides the precision needed to plan a safe and effective procedure.
• Better long-term results: Properly guided stent placement reduces the likelihood of the stent failing or re-narrowing over time.
• Real-time feedback: Dr. Karthick Sabapathi can use the IVUS images during the procedure itself to confirm that everything is going as planned and make adjustments if needed.

These benefits make intravascular ultrasound treatment in Chennai a reliable choice for patients who want the most accurate and careful approach to their cardiac care.

Intravascular ultrasound is a well-established and generally safe procedure. It is performed routinely alongside coronary interventions and has a strong track record of safety.

That said, as with any invasive cardiac procedure, there are some small risks to be aware of:

• Temporary spasm of the artery: The catheter may cause a brief, mild narrowing of the artery, which usually resolves on its own quickly.
• Minor bleeding or bruising at the access site: This is common with any catheter-based procedure and usually settles within a few days.
• Rare risk of artery injury: In rare cases, the catheter could cause a small tear in the artery wall, though this is uncommon and can be managed promptly.
• Allergic reaction to contrast dye: If contrast dye is used during the same procedure, some patients may have a mild reaction.

It is important to note that the IVUS imaging probe itself does not use radiation — it uses sound waves, which are safe. The X-ray guidance used to position the catheter does involve a small amount of radiation, but this is carefully managed and kept to the minimum necessary.

Dr. Karthick Sabapathi will always discuss the specific risks and benefits with you before any procedure, taking into account your overall health and medical history. The goal is always to choose the safest and most effective path forward for each patient.

Intravascular ultrasound is one of the most powerful tools available in modern cardiac catheterisation. It gives cardiologists a level of detail about the inside of heart arteries that simply cannot be obtained any other way.

For patients in Chennai who need coronary artery evaluation or stent placement, Dr. Karthick Sabapathi brings the expertise and technology to make this procedure work to your advantage. With a careful, image-guided approach, he aims to ensure that every intervention is not just effective, but as safe and precise as possible.