What Happens When Arteries Turn "Stony"?
Your heart works around the clock, pumping blood through a vast network of arteries. Over years, fatty deposits, inflammation, and — importantly — calcium can build up inside the walls of these arteries. Calcium sounds harmless enough; after all, we need it in our bones. But when calcium settles deep inside an artery wall, it makes the vessel stiff, narrow, and difficult to treat with standard techniques.
Doctors call this heavily calcified coronary artery disease. In cities like Rajkot, where lifestyle factors such as a high-carbohydrate diet, diabetes, and high blood pressure are common, calcified arteries are seen frequently in cardiology practice. Patients may experience chest discomfort, breathlessness on exertion, or simply be found to have significant calcium on a routine heart scan.
The challenge? When an artery is heavily calcified, standard balloon angioplasty balloons cannot always fully expand, and a stent placed inside may not sit properly. This is where a newer, innovative technique — intravascular lithotripsy (IVL) — comes into the picture.
What Is Intravascular Lithotripsy?
The word "lithotripsy" may already be familiar to you — it is the technology used to break kidney stones using sound waves. Intravascular lithotripsy coronary calcium treatment borrows the same elegant principle and applies it inside the heart's arteries.
A specially designed catheter (a thin, flexible tube) is guided through a small entry point — usually in the wrist or groin — and carefully navigated to the calcified section of the coronary artery. At the tip of this catheter sits a small balloon embedded with tiny emitters. When the balloon is gently inflated, these emitters release pulsed sonic pressure waves — essentially, precisely targeted sound energy.
These waves travel through the soft tissue of the artery wall and selectively fracture the calcium deposits, without stretching or tearing the softer inner lining of the vessel. Think of it like cracking the hard shell of a walnut without damaging the nut inside.
Once the calcium is cracked and the artery wall becomes more flexible, the interventional cardiologist can then inflate an ordinary angioplasty balloon fully and, where needed, place a stent that sits snugly and evenly. The result is a better-expanded artery with a lower risk of complications.
Who May Benefit from This Procedure?
Not every patient with coronary artery disease needs intravascular lithotripsy. It is specifically suited for situations where calcium makes conventional treatment difficult. Your cardiologist will evaluate you thoroughly — including with imaging tools such as intravascular ultrasound (IVUS) or optical coherence tomography (OCT) — to understand how much calcium is present and where it sits in the artery wall.
IVL may be considered for:
- Patients with moderate-to-severe coronary calcification detected during angiography or CT coronary angiography
- Individuals where standard balloon angioplasty has not been able to fully open the artery (what cardiologists call an under-expanded balloon)
- Those with calcified lesions ahead of planned stent placement, where proper stent expansion is critical for long-term success
- Older adults or those with long-standing diabetes, where calcium buildup in arteries tends to be more pronounced
- Patients who are not suitable candidates for more complex rotational or laser atherectomy techniques due to specific anatomical or health reasons
To illustrate: a 62-year-old with long-standing diabetes and high blood pressure might come in with chest discomfort during walks. Angiography reveals a heavily calcified narrowing in a major coronary artery. Standard balloon angioplasty struggles to open the vessel adequately. In such a scenario, IVL can prepare the artery to receive a stent properly — potentially improving both the immediate result and the long-term durability of the procedure.
How Is the Procedure Performed? A Step-by-Step Overview
Understanding what happens during the procedure can go a long way in easing any anxiety. Here is a simple walk-through:
1. Preparation
You will be asked to fast for a few hours before the procedure. A local anaesthetic is used at the entry site (wrist or groin), so the procedure is comfortable. A mild sedative may also be given to help you relax.
2. Accessing the Artery
A thin tube called a sheath is placed into the artery. Guide wires and catheters are then gently navigated to the heart under X-ray guidance — this is completely standard in any coronary angioplasty procedure.
3. Delivering the IVL Catheter
The Shockwave IVL catheter — the technology most widely used — is threaded over the guide wire to the calcified segment of the coronary artery.
4. Delivering Sonic Pulses
The balloon is inflated at a low pressure and sonic pulses are delivered in short cycles — typically sets of 10 pulses. You may feel a slight fluttering sensation in the chest during this time, which is normal and brief.
5. Completing the Procedure
After the calcium is adequately fractured, the IVL catheter is removed, and the cardiologist proceeds with conventional balloon angioplasty and stent placement as planned. The entire procedure usually takes a similar amount of time to a standard angioplasty.
6. Recovery
Most patients rest in the hospital for 24 hours post-procedure. The recovery is similar to any standard coronary intervention — wrist-entry procedures particularly allow for early ambulation and a comfortable recovery.
Is Intravascular Lithotripsy Safe?
Clinical studies, including the landmark DISRUPT CAD trial series, have shown that intravascular lithotripsy has a favourable safety profile. Because the sonic waves target calcium specifically, injury to the soft arterial tissue is minimised compared to some other calcium-modification techniques.
Key points on safety:
- Selective action: Pressure waves fracture calcium but spare the delicate inner lining (endothelium) of the artery
- Predictable results: Imaging studies show more uniform calcium fracture and better stent expansion compared to angioplasty alone in calcified lesions
- Well-tolerated: The procedure is performed under local anaesthesia with sedation; general anaesthesia is not required
- Proven in real-world practice: IVL has been adopted in interventional cardiology centres globally and is increasingly available in advanced cardiac centres in India, including in Gujarat
As with any cardiac intervention, there are risks — such as those associated with any angioplasty, including rare vessel injury or stent-related issues — which your cardiologist will explain in detail before the procedure.
How Does IVL Compare with Other Calcium-Modification Techniques?
There are a few techniques used to deal with calcified arteries. Your cardiologist will recommend the most appropriate one based on your specific anatomy and clinical situation.
| Technique | How It Works | Key Consideration |
|---|---|---|
| Rotational Atherectomy | A tiny rotating burr drills through calcium | Effective but requires careful technique for complex lesions |
| Orbital Atherectomy | An eccentrically rotating crown sands down calcium | Useful for certain lesion types |
| Laser Atherectomy | Laser energy vaporises plaque and calcium | Used in select situations |
| Intravascular Lithotripsy | Sonic waves fracture calcium non-ablatively | Preserves arterial lining; comfortable delivery |
IVL stands out because it modifies rather than removes calcium — fracturing it so the artery becomes pliable enough to accept a stent, rather than drilling or ablating tissue. This is particularly advantageous when calcium sits deep in the artery wall.
Life After the Procedure: What to Expect
A successful IVL-assisted angioplasty and stent procedure should relieve artery narrowing and improve blood flow to the heart. However, the procedure is one part of a longer journey. Long-term success depends greatly on:
- Taking prescribed medications faithfully — especially antiplatelet drugs (such as aspirin and clopidogrel or ticagrelor) which protect the stent
- Regular follow-up appointments with your cardiologist
- Adopting a heart-healthy lifestyle — a diet lower in refined carbohydrates and saturated fats, regular moderate exercise such as brisk walking, smoking cessation, and good control of blood sugar and blood pressure
- Reporting any new symptoms promptly — such as recurrent chest discomfort or breathlessness
Many patients notice an improvement in their symptoms — such as reduced chest discomfort during activity — within weeks of a successful procedure.
Key Takeaways
- Calcium buildup in coronary arteries makes standard angioplasty difficult and can compromise stent placement.
- Intravascular lithotripsy (IVL) uses pulsed sonic pressure waves to fracture calcium deposits — similar in principle to how kidney stones are broken up.
- The technique selectively targets calcium while preserving the softer inner lining of the artery.
- IVL is typically used before balloon angioplasty and stent placement in patients with moderate-to-severe coronary calcification.
- Clinical evidence supports its safety and effectiveness for improving outcomes in calcified coronary lesions.
- Recovery is similar to standard angioplasty, and long-term success depends on medications, lifestyle changes, and regular follow-up.
If you have been told that you have calcium in your coronary arteries, or if you have concerns about your heart health, please consult a qualified interventional cardiologist for a thorough evaluation. To book a consultation with Dr. Nikhila Pachani at her Rajkot clinic, use the contact details on this website — your heart health is worth a conversation.
Frequently asked questions
- What is intravascular lithotripsy and how does it treat coronary calcium?
- Intravascular lithotripsy (IVL) is a minimally invasive cardiac procedure that uses pulsed sonic pressure waves — delivered through a specialised balloon catheter — to fracture calcium deposits inside hardened coronary arteries. By cracking the calcium, it makes the artery flexible enough for a balloon and stent to expand properly, improving blood flow to the heart.
- Is intravascular lithotripsy painful or uncomfortable?
- The procedure is performed under local anaesthesia with mild sedation, making it comfortable for most patients. Some people notice a brief, mild fluttering sensation in the chest when the sonic pulses are delivered, but this is temporary and well-tolerated. General anaesthesia is not required.
- How is IVL different from rotational atherectomy for calcified arteries?
- Rotational atherectomy uses a tiny rotating burr to physically drill through and remove calcium, whereas intravascular lithotripsy uses sonic waves to fracture calcium without removing tissue. IVL is non-ablative — it modifies the calcium so the artery wall becomes more pliable, while preserving the delicate inner lining of the vessel. Your cardiologist will recommend the most suitable technique based on your specific coronary anatomy.
- Who is a good candidate for intravascular lithotripsy?
- IVL is generally considered for patients with moderate-to-severe calcium buildup in their coronary arteries where standard balloon angioplasty alone may not be sufficient to fully open the vessel before stent placement. This commonly includes older adults, patients with long-standing diabetes or high blood pressure, or those in whom earlier ballooning has not achieved adequate artery expansion. A thorough evaluation, often including coronary imaging, helps your cardiologist decide if IVL is right for you.