Complex Coronary Intervention: CTO, Drug-Coated Balloons and IVUS

Some blockages are harder to treat than others, such as long-standing complete blockages, heavily calcified arteries, branch points or the main artery of the heart. Complex PCI uses specialised equipment and techniques, often guided by imaging from inside the artery, to treat these when it is the right option.

Chronic total occlusion (CTO): an artery that has been completely blocked for a long time
Drug-coated balloons: medicine delivered without leaving a new stent, in selected cases
IVUS: ultrasound from inside the artery to guide treatment
Decisions are individual and discussed in detail with you

What makes a PCI “complex”?

A procedure may be considered complex because of:

a chronic total occlusion (a long-standing complete blockage)
heavy calcium in the artery wall
narrowings at a branch point (bifurcation) or in the left main artery
long or widespread disease
re-narrowing inside a stent placed previously (in-stent restenosis)
previous bypass surgery or reduced heart function

These procedures can take longer and need particular experience and equipment. Careful planning helps balance the expected benefit against the risks.

Chronic total occlusion (CTO) intervention

A CTO is a coronary artery that has been completely blocked for a prolonged period, generally three months or more. Blood often still reaches the heart muscle beyond the blockage through small natural channels called collaterals, but these may not be enough during exertion.

CTO PCI uses specialised wires and techniques to cross and reopen the blocked segment. It is mainly considered to relieve angina that continues despite medicines, in carefully selected patients.

Drug-coated balloon (DCB) intervention

A drug-coated balloon carries a medicine that is transferred into the artery wall when the balloon is inflated. The balloon is then removed, leaving no new stent behind. Drug-coated balloons are an established treatment for re-narrowing inside a previously placed stent, and they are used in selected other situations, such as some small arteries.

Intravascular ultrasound (IVUS)

IVUS uses a tiny ultrasound probe on a catheter to create cross-sectional pictures from inside the artery. It shows the true size of the vessel, the amount and type of plaque, and whether a stent is fully expanded and well positioned.

Current European guidelines recommend intracoronary imaging, such as IVUS, to guide PCI in anatomically complex lesions, including the left main artery, true bifurcations and long lesions.

Interventional case insights

There is not yet a patient-education video on CTO, drug-coated balloons or IVUS on the channel. These short clinical clips from Dr. Qureshi are intended for healthcare professionals.

Is complex PCI right for me?

Not every complex blockage needs a procedure. The decision weighs your symptoms, the amount of heart muscle at risk, other options including medicines and bypass surgery, and the expected benefits and risks. Dr. Qureshi will explain these options so that you can make an informed decision.

Questions patients ask

Is CTO PCI the same as a normal angioplasty?

It follows the same principles, but crossing a long-standing complete blockage needs specialised wires and techniques and often a longer procedure. The likely benefits and risks depend on the features of the blockage and are discussed individually.

Why use IVUS?

IVUS lets the cardiologist measure the artery accurately and confirm that a stent is well expanded, which is particularly important in complex lesions.

Does a drug-coated balloon mean no stent?

With a drug-coated balloon no new stent is left behind. Whether a drug-coated balloon, a stent or a combination is best depends on the artery and the narrowing.

References

Vrints C, et al. 2024 ESC Guidelines for the management of chronic coronary syndromes. Eur Heart J 2024;45:3415–3537. doi.org/10.1093/eurheartj/ehae177 (opens in a new tab)
Jeger RV, et al. Drug-coated balloons for coronary artery disease: third report of the International DCB Consensus Group. JACC Cardiovasc Interv 2020;13:1391–1402. pmc.ncbi.nlm.nih.gov/articles/PMC7295488/ (opens in a new tab)
Lawton JS, et al. 2021 ACC/AHA/SCAI Guideline for Coronary Artery Revascularization. Circulation 2022;145:e18–e114. doi.org/10.1161/CIR.0000000000001038 (opens in a new tab)

This page is general information about the condition or procedure, not personal medical advice. Whether a test or treatment is right for you is decided at your consultation. Medical disclaimer.

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Clinic at Rawalpindi Institute of Cardiology (RIC), Room 8. Monday to Friday, 3:00 PM to 8:00 PM. Call or WhatsApp +92 307 5793387.